I trade USA option from Aust, have no knowledge of spreads other than they exist. Have tried reading & watching YouTube videos but there is a lot of BS to sort through.

Duck.ai said
That’s a sensible reaction—options content is full of jargon, cherry-picked results, and strategies presented as “easy income.” The useful way to learn spreads is to start with risk diagrams and maximum loss, not with strategy names.

A spread simply means buying one option and selling another option on the same underlying, usually with the same expiry. The sold option reduces the cost of the bought option, but it also limits the potential profit.

The four basic vertical spreads are:

Spread Market view Maximum loss Maximum profit
Bull call spread Moderately bullish Net debit paid Strike width − debit
Bear put spread Moderately bearish Net debit paid Strike width − debit
Bull put spread Moderately bullish/neutral Strike width − credit Credit received
Bear call spread Moderately bearish/neutral Strike width − credit Credit received
Example: a 100/105 bull call spread:

Buy the $100 call
Sell the $105 call
Same expiry
Suppose it costs $2.00 per share
One US option contract usually represents 100 shares
Then:

Maximum loss: $2 × 100 = $200
Maximum profit: ($5 − $2) × 100 = $300
Breakeven: $102
The position cannot lose more than $200 at expiry, assuming it is closed or managed properly
The most important distinction is:

Debit spread: you pay to enter; your maximum loss is normally the amount paid.
Credit spread: you receive money to enter; your maximum loss is normally larger than the credit received.
For someone starting out, I’d learn in this order:

Calls and puts individually
Intrinsic value, extrinsic value, and expiration
Long call and long put risk
Bull call and bear put spreads
Bull put and bear call spreads
Assignment, exercise, and early assignment
Liquidity, bid–ask spreads, commissions, currency conversion, and tax treatment
Only then: iron condors, calendars, diagonals, butterflies, and multi-leg adjustments
A few rules will filter out much of the bad material:

Never enter a spread unless you can state its maximum loss in dollars.
Ignore “high win rate” unless the source also shows the average loss and worst-case loss.
A 90% probability of profit can still be a poor trade if the occasional loss is very large.
Use limit orders, not market orders, for multi-leg positions.
Check whether your broker handles the order as one spread rather than filling the legs separately.
Learn the broker’s policy for assignment, exercise, expiry, and cash settlement.
Remember that US options are generally quoted per share, while the contract multiplier is typically 100.
As an Australian resident, account for USD/AUD movements, brokerage, withholding or tax issues, and the possibility that your broker’s treatment differs from general US explanations.
The cleanest beginner framework is:

Choose a directional view → choose a maximum dollar risk → choose an expiry → choose strikes → calculate maximum profit, maximum loss, and breakeven before entering.

For example, instead of saying “I want to sell puts for income,” define the trade as:

“I am willing to risk no more than US$250 for a moderately bullish position, and I accept that the entire amount could be lost.”

That naturally leads to a defined-risk spread rather than an uncovered option.

I can teach this as a plain-English mini-course using numerical examples, starting with what each leg does and how to draw a payoff diagram, without assuming any prior knowledge.

You said
I don’t own any stocks, trying to build account from options trading to eventually do that. So currently only interested in speeds that work just with options, if that exists. I dont want margin calls, happy for account to be limited while a trade is open, then when I close the position I can see & use my account balance

Duck.ai said

Yes—what you’re describing exists. The main category is defined-risk option spreads, especially vertical spreads. They use options only, require no stock ownership, and let you know the maximum possible loss before entering.

The two most suitable structures to learn first are:

Your view Structure What you do Account commitment
Moderately bullish Bull call debit spread Buy a call, sell a higher-strike call Usually the debit paid
Moderately bearish Bear put debit spread Buy a put, sell a lower-strike put Usually the debit paid
Moderately bullish or neutral Bull put credit spread Sell a put, buy a lower-strike put Maximum loss less credit
Moderately bearish or neutral Bear call credit spread Sell a call, buy a higher-strike call Maximum loss less credit
A debit spread is probably the simplest place to begin because you pay a known amount and normally cannot lose more than that amount.

Example:

Buy the $100 call
Sell the $105 call
Same stock and expiry
Pay $1.50 per share
One contract controls 100 shares
Your figures are:

Maximum loss: $1.50 × 100 = $150
Maximum profit: ($5.00 − $1.50) × 100 = $350
Breakeven at expiry: $101.50
You do not need to own the stock. The $105 short call limits the trade, and the $100 long call protects you if the stock rises sharply.

A credit spread works differently. For example:

Sell the $100 put
Buy the $95 put
Receive $1.50 credit
Then:

Maximum profit: $150
Maximum loss: ($5.00 − $1.50) × 100 = $350
Breakeven at expiry: $98.50
The broker will generally reserve approximately the maximum loss—here, about $350—as buying power while the trade is open. When you close the spread, that buying power should be released, subject to the broker’s settlement and account rules. A spread is defined-risk in theory, but the broker may still impose special expiration or assignment procedures. Short US equity options can be assigned before expiration, and an assigned short leg can temporarily create a stock position. The long leg may protect the economic risk, but it does not always prevent an operational problem in the account.
eoption.com
1

For your stated goal, I would avoid these at first:

Naked calls or naked puts
Cash-secured puts, because assignment can require buying 100 shares
Covered calls, because they require shares
Short straddles and strangles
Calendar or diagonal spreads, because the two expiries create more complicated assignment risk
Iron condors until you fully understand vertical spreads
0DTE trades, because price and assignment risk change very quickly
A practical beginner rule would be:

Trade only one- or two-leg vertical spreads.
Make sure the broker accepts the order as a spread, not as separate naked legs.
Risk only a small fixed amount per trade—for example, 1% of the account while learning.
Never allow a short option to remain open through expiration until you understand your broker’s automatic exercise and assignment policy.
Close the whole spread before expiration, particularly when either strike is near the share price.
Judge the trade by maximum loss, not by the small premium received.
Keep enough unused cash for fees, currency movements, and an unexpected broker adjustment.
One important correction to the expectation: spreads can prevent a conventional margin call from an unlimited-loss trade, but they cannot guarantee that your account will never show a temporary deficit. Early assignment, expiration processing, market gaps, currency conversion, or a broker liquidating a position can cause problems if the position is held too close to expiration. Closing the entire spread before expiration substantially reduces that operational risk.

Your learning path should therefore be:

First: bull call debit spreads
Second: bear put debit spreads
Third: bull put credit spreads
Fourth: bear call credit spreads
Later: more complex spreads
The key question for every proposed trade is:

“If the trade goes wrong and I do nothing, exactly how many US dollars can disappear?”

If the answer is not immediately clear, it does not yet fit your trading plan.

You said
I will always plan on selling the position before the Greeks go against me. I might buy 60 DTE but it could be sold in the first week if the trend end is likely. If possible ride the trend with calls up & puts down

Duck.ai said
That approach can work with long calls for uptrends and long puts for downtrends, but “sell before the Greeks go against me” needs refining. Greeks are not independent signals:

Delta measures directional exposure.
Theta is the daily time decay you pay.
Vega measures sensitivity to implied volatility.
Gamma measures how quickly delta changes.
For a long call or put, theta is usually working against you from day one. Waiting until theta “turns against you” is therefore not a reliable exit rule. A trade can lose money even while the trend remains correct if implied volatility falls or the move is too slow.

For your objective, there are two sensible structures.

Long options
For an expected strong move:

Buy a call for an upward trend.
Buy a put for a downward trend.
Risk is limited to the premium paid.
No stock ownership is required.
There is no conventional margin call from the option itself.
The disadvantages are time decay and volatility risk. A 60-DTE option is not automatically a 60-day trade—you can sell it after a week—but you still need enough movement soon enough to overcome the premium paid.

Debit spreads
For a more moderate move:

Buy a call and sell a higher-strike call for bullish exposure.
Buy a put and sell a lower-strike put for bearish exposure.
Maximum loss is known.
Time decay is often less severe than with a standalone long option.
Maximum profit is capped.
The trade-off is that the short option can create assignment and expiration complications, so close the entire spread before expiration rather than letting it drift into the final days.

A simple example of a bullish call trade:

Stock: $100
Buy a 60-DTE $100 call for $4
Maximum loss: $400 per contract
Breakeven at expiration: $104
If the stock rises quickly, the option may gain value well before expiration and can be sold for a profit.
The important point is that you do not need to hold until expiration or reach the expiration breakeven. Before expiration, the option can become profitable because of its remaining time value.

For trend trading, define the exit before entering. For example:

Technical exit: close if the stock closes below your trend level.
Premium exit: close if the option loses 30–40% of its cost.
Profit exit: take some or all profit after a predefined gain.
Time exit: close if the move has not started after, say, 10 trading days.
Event exit: avoid holding through earnings unless that is specifically part of the plan.
Do not use all of these mechanically at once. A clean beginner plan might be:

Buy a 45–75 DTE call or put, risk no more than 1% of the account, exit if the trend breaks or the option loses 35%, and close before the option reaches its final 21 days.

For “riding” a trend, selling the whole option every time the trend briefly pauses can produce repeated losses from bid–ask spreads and commissions. A better approach is to take partial profit or move the stop based on the underlying price, not on a Greek alone.

Also distinguish directional accuracy from option profitability. You can correctly predict that a stock will rise and still lose on a call if:

The move is too small.
The move happens too slowly.
Implied volatility falls.
You paid too much for the option.
The bid–ask spread is wide.
For a small account, liquid ETFs and highly liquid large-cap stocks are generally easier to trade than obscure names because the option spreads are often tighter. Avoid selecting trades purely because an option is cheap—cheap options are frequently cheap because the market assigns them a low probability of finishing profitably.

You said
Would this work with SPY, QQQ etc

Duck.ai said

Yes. SPY and QQQ are suitable instruments for the style you’re describing, particularly because their options are generally heavily traded, with many strikes and expiries. SPY tracks the S&P 500; QQQ tracks the Nasdaq-100. QQQ is usually more technology-heavy and tends to move more sharply, while SPY is broader and often a little steadier.
merrilledge.com
1

For a beginner, I’d start with SPY, then consider QQQ once you’re comfortable. You could use:

Long SPY call: expecting an upward move
Long SPY put: expecting a downward move
SPY bull call debit spread: bullish, with lower cost and capped profit
SPY bear put debit spread: bearish, with lower cost and capped profit
The key caution is that SPY and QQQ are ETFs, not cash-settled indexes. Their standard options are American-style and physically settled into ETF shares if exercised or assigned. That means a short option can potentially be assigned before expiration, and one contract normally represents 100 ETF shares.
merrilledge.com

That makes the distinction important:

Long call or long put only: no short leg and no assignment obligation; your maximum loss is the premium paid.
Debit spread: defined economic risk, but the short leg can still be assigned; close the entire spread before expiration.
Credit spread: defined maximum loss, but more buying power is reserved and assignment management matters more.
For your stated preference—account capital tied up while open, then released when closed—the cleanest starting structure is probably:

One long call or put, or one debit spread, entered and closed before expiration.

SPY is often the better training ground because it is more diversified and usually less sensitive to one technology stock’s news. QQQ can be attractive for trend trades, but its faster movement means your option price can change more quickly in either direction. Do not assume “more movement” automatically means easier profits.

A practical example:

Buy a SPY call 45–75 days from expiration.
Use a strike near the current price or slightly in/out of the money.
Risk only an amount you can lose completely.
Set the exit based on the SPY chart, not only the option’s Greeks.
Close the position if the trend breaks, the option loses your predefined percentage, or the move fails to develop after a set number of trading days.
Avoid holding a debit spread into expiration while learning.
Also compare the actual bid–ask spread before entering. Even highly liquid products can have poor pricing at particular strikes or expiries. Use a limit order and check the estimated fill for the complete spread. SPY and QQQ also have frequent short-dated expirations, but those are not an advantage for a beginner; short-dated options lose time value faster and can react violently to small moves.
merrilledge.com

You said
Can I do some research & come back for a answers

Duck.ai said
Absolutely. Take your time researching, and come back with any strategy, video claim, trade example, or terminology you want checked.

A useful format is:

Underlying: SPY, QQQ, or another instrument
Expiry: for example, 60 DTE
Trade: buy/sell which strike and option type
Entry price: debit or credit
Proposed exit: what would make you close it
Your concern: risk, Greeks, assignment, margin, or profitability
I can then translate it into plain English and calculate the maximum loss, maximum profit, breakeven, and what could go wrong.

You said
appreciated

Duck.ai said
You’re welcome. Take it slowly, focus on defined-risk trades, and paper-trade the mechanics before using real money.

You said
I trade with Interactive Brokers & I’m a small account holder trying to build account for extra retirement funds. Am I allowed vertical spreads with IB if so how do I do that?

Duck.ai said

Yes, IBKR generally supports vertical spreads, including bull call spreads and bear put spreads, but your account must have the required US options trading permission. Approval is account-specific and can depend on your financial information, experience, objectives, and the IBKR entity servicing your Australian account. IBKR lists limited-risk strategies among its options permissions, but the exact level and availability shown in your account is what controls.
interactivebrokers.com.au
1

For your situation, check this first:

Log in to IBKR Client Portal.
Open the user menu in the top-right.
Go to Settings → Trading → Trading Permissions.
Select Options and review or request the relevant permission level.
Select the relevant region/product, such as United States options, if shown.
Complete the application and wait for IBKR’s decision.
IBKR’s documentation says trading permissions are requested from that Trading Permissions panel.
ibkrguides.com

You can also check the account’s cash available, buying power, and margin impact before submitting an order. For a debit spread, IBKR should show the estimated debit and maximum risk in the order preview. Do not submit the trade unless those figures are what you expect.

How to build a vertical spread
In IBKR Desktop or TWS:

Open an option chain for SPY or QQQ.
Select the same expiration for both legs.
Open Strategy Builder.
For a bullish call spread:
Buy the lower-strike call.
Sell the higher-strike call.
For a bearish put spread:
Buy the higher-strike put.
Sell the lower-strike put.
Enter the number of spreads—start with one.
Choose a limit order.
Review the order preview:
Debit or credit
Maximum loss
Maximum profit
Buying-power effect
Commission
Submit only after confirming the order is a single combination/spread order.
IBKR’s Strategy Builder is designed to add multiple option legs, change each leg between buy and sell, and label common strategies such as bull calls and calendar spreads.
interactivebrokers.com

In IBKR Mobile, option chains also support combination orders. The general process is to open the option chain, select the legs, review the combination, and submit it as one order.
interactivebrokers.com

For your first trade, I would use a one-contract debit spread, not a credit spread. For example:

Buy 1 SPY call
Sell 1 higher-strike SPY call
Same expiry
Pay a maximum debit you can afford to lose entirely
A debit spread does not normally create an unlimited-loss margin problem, but it is not risk-free. The option premium can go to zero, and a short leg can create assignment complications if you hold the spread close to expiration. IBKR specifically notes that short options carry assignment risk and that multi-leg trades incur multiple transaction costs.
interactivebrokers.com.au
1

Before risking money, use IBKR paper trading and practise these three actions:

Open a spread as one combination order.
Close the entire spread as one combination order.
Cancel or modify an unfilled combination order.
Also check the Order Preview every time. If IBKR rejects the order, or if the preview shows a much larger buying-power reduction than the spread’s maximum loss, do not try to work around it with separate legs—contact IBKR or check the permissions and account type first.

You said
Will never go anywhere near expiration. Main concern is what can happen after hours with open position & how that hurts position. SPY, currently seems to be ranging & very much oversold. I feel a huge correction should have happened, but the big boy just keep trading. I check CNNs fear & greed daily. I’d love to make $300-$500 & get out, when the trend is holding, then I would stay in longer & apply trailing stops. So do you think vertical spreads better or worse that outright option trade?

Duck.ai said

For the plan you described, I’d generally prefer defined-risk debit spreads over outright long options—but not in every situation.

What happens after hours?
For regular SPY and QQQ options, the ETF can move after the US options market closes, but the options themselves generally do not trade after hours. IBKR may display indicative or stale option prices outside regular options hours. The next session can therefore open with a large gap, and your spread or outright option may be worth substantially more or less before you can act.
interactivebrokers.com

Because you plan to exit well before expiration:

You greatly reduce automatic exercise and expiration-delivery risk.
A debit spread can still have early assignment risk on its short leg, particularly around dividends.
The main overnight risk becomes a gap against your position.
A stop order on the option may not protect you at the intended price after a gap.
A stop based on SPY itself is usually more meaningful than one based on an option’s displayed price.
IBKR warns that short options can be assigned before expiration and that account exposure can change sharply if assignment results in stock delivery.
interactivebrokers.com
1

Outright option versus vertical debit spread
Feature Outright call/put Debit spread
Maximum loss Premium paid Debit paid
Maximum profit Theoretically uncapped for a call; substantial for a put Capped
Cost Higher Lower
Time decay Usually stronger Often less severe
Volatility benefit More sensitive to rising IV Less sensitive
Best for A strong, fast move A moderate move toward a target
Assignment risk None if you only buy the option Exists on the short leg
Overnight gap risk Can be large Can be large, but capped by the spread width
Suppose SPY is at $500.

Outright call:

Buy the $500 call for $5
Maximum loss: $500 per contract
If SPY surges, your profit can continue increasing
Bull call spread:

Buy the $500 call
Sell the $510 call
Pay $3
Maximum loss: $300
Maximum profit: $10 − $3 = $7 × 100 = $700
The spread costs less and reduces time decay, but if SPY rises strongly above $510, the spread stops gaining. The outright call would continue gaining.

A useful decision rule is:

Use an outright option when you expect a strong move soon and want uncapped upside.
Use a debit spread when you have a directional view but expect the move to be moderate or want to reduce the premium at risk.
For a small account with a $300–$500 target, the spread is not automatically safer in percentage terms. To make $300–$500, you may still need to risk a similar or larger amount, depending on the spread’s price and size. Do not choose the number of contracts based on the desired profit; choose it based on the maximum acceptable loss.

I would also avoid using “SPY is oversold” or the CNN Fear & Greed reading as the entire entry signal. Oversold conditions can persist, and a market can remain range-bound longer than expected. Use a defined trigger, such as:

SPY reclaiming a specific resistance level for a bullish trade;
SPY breaking and holding below support for a bearish trade;
confirmation from price action rather than sentiment alone.
For your stated approach, a reasonable learning template would be:

One SPY 45–75 DTE debit spread, entered only after a clear directional trigger, with the entire position closed before the final 21 days and before any relevant ex-dividend date.

Use a trailing stop based on SPY’s price or chart structure, not on the option premium alone. Option prices can jump because of implied-volatility changes even when SPY barely moves.

You said
Very interesting, will do more testing & return for more advice.

Duck.ai said
Sounds good. Testing with paper trades is especially useful for comparing:

Outright calls or puts versus debit spreads
SPY versus QQQ
Different expiries, such as 30, 60, and 90 DTE
Exiting based on the option price versus the underlying ETF
Overnight gaps and the next-session opening price
Record the entry debit, maximum loss, days held, SPY/QQQ movement, implied volatility, and exit result. After 20–30 simulated trades, the patterns should become much clearer than they do from isolated examples.

You said
OK given that I’m happy to trade SPY, in a market that I can see $5 & even $10 gains in less than 1 month, & willing to risk $300 – $400 in a Vertical Call Spread. How would a trade work? What strikes do I choose? I’m guessing DTE 65-90 days. Can you give examples?

Duck.ai said

Yes. A bull call debit spread can fit your plan, but the strikes should be chosen from the risk and profit you want, not simply from “65–90 DTE.”

Using the latest quoted SPY level available to me—approximately $775—the examples below are illustrations, not live trade recommendations. Option premiums change constantly, so use the actual bid/ask in IBKR when testing.
Robinhood
1

The basic construction
For a bullish SPY trade:

Buy a call near the current SPY price or slightly below it.
Sell a higher-strike call with the same expiry.
Use one contract.
Enter it as a single debit-spread order.
The calculations are:

Maximum loss
=
debit paid
×
100
Maximum loss=debit paid×100

Maximum profit
=
(
strike width
−
debit
)
×
100
Maximum profit=(strike width−debit)×100

Breakeven at expiration
=
long-call strike
+
debit
Breakeven at expiration=long-call strike+debit

Example 1: $5-wide spread
Assume SPY is $775 and you find a 75-DTE spread priced approximately as follows:

Buy the $775 call
Sell the $780 call
Pay $3.20 debit
Results:

Maximum loss: $3.20 × 100 = $320
Maximum profit: `($5.00 − $3.20) × 100 = $
Breakeven at expiration: $778.20
This fits your $300–$400 risk limit, but it cannot make $300–$500. Its absolute maximum profit is $180 per spread.

Example 2: $10-wide spread
Assume:

Buy the $775 call
Sell the $785 call
Pay $3.80 debit
Results:

Maximum loss: $380
Maximum profit: `($10.00 − $3.80) × 100 = $
Breakeven at expiration: $778.80
This better fits your desired profit range. If SPY rises strongly and the spread expands from $3.80 to $6.80, you would make approximately $300 before costs. If it reaches $9.00, the profit would be about $520.

However, this does not mean a $5 or $10 SPY rise automatically produces a $300–$500 gain. The result also depends on:

How quickly SPY moves
Implied volatility
The starting delta of the long call
The distance between the strikes
The bid–ask spread
Whether the market gaps or moves smoothly
How I would select the strikes
For a beginner testing this idea, I’d examine three versions:

Style Long call Short call Characteristics
More conservative Near-the-money 5 points higher Higher cost, lower max profit
Balanced Near-the-money 7–10 points higher More room for profit
Aggressive Slightly out-of-the-money 10–15 points higher Cheaper, but needs a larger move
With SPY near $775, that might mean comparing:

$775/$780
$775/$785
$780/$790
Rather than selecting the short strike solely by price, inspect the delta. A reasonable educational starting point is often:

Long call: roughly 0.50–0.60 delta
Short call: roughly 0.20–0.35 delta
These are not magic numbers. They simply give you a systematic way to compare spreads. The long call is close enough to respond to a moderate move, while the short call sits farther away as a profit cap.

Your $300–$400 risk limit
With one contract, the debit should generally be between $3.00 and $4.00, because each $1.00 of option premium equals $100 per contract.

But be careful: a $3.00 debit is not automatically a good trade. A $10-wide spread costing $3.00 has a theoretical maximum profit of $700, while a $5-wide spread costing $3.00 has a maximum profit of only $200.

A useful screening rule is:

If the debit is $3.50, the spread should ideally be wide enough that the maximum profit is still attractive—but not so wide that the short strike is unrealistic.

For example:

$5-wide spread costing $3.50 → max profit $150
$10-wide spread costing $3.50 → max profit $650
$15-wide spread costing $3.50 → max profit $1,150, but the short strike may be too far away to have a realistic chance of being reached
Exit planning
Since you intend to exit early, calculate the desired exit price before entering.

For a $10-wide spread bought at $3.80:

Exit at $5.30 → approximately $150 profit
Exit at $6.80 → approximately $300 profit
Exit at $8.80 → approximately $500 profit
Maximum possible value → $10.00
That is often more practical than waiting for expiration breakeven. You might also define a loss exit—for example, closing if the spread falls to $2.30, which would lose about $150—rather than automatically holding until the full $380 is lost.

For trailing stops, base the decision mainly on SPY’s price structure. If SPY breaks the support level that justified the bullish trade, close the spread. A mechanical stop on the option itself can be unreliable because implied volatility and the bid–ask spread can distort the option price.

One important point: if your target is $300–$500 from a $300–$400 risk, you are targeting roughly a 75%–167% return on risk. That is possible on a successful directional move, but it should not be treated as a normal or easy monthly objective. A more repeatable process is to choose a spread whose maximum loss you can tolerate, then let the market determine whether the profit target is reached.

For paper testing, compare the same setup at 65, 75, and 90 DTE, recording:

SPY price at entry
Long and short strikes
Debit
Delta and implied volatility
Spread value after 5, 10, and 20 trading days
SPY’s move
Whether the spread reached a 50%, 75%, or 100% return
That will show you whether your strategy works because of the underlying move, or merely appears attractive in a few selected examples.

You said
So for choosing which strikes I use a similar approach I use to select a call option ie find the best strike I can afford with the best delta. Then I use Barcharts Option Calc to see what happens price gains & with time decay

Do I use this same approach to select & test possible gains for a Vertical Call Spread?

Duck.ai said
Yes—use the same general process, but evaluate the combined spread, not the long call by itself.

For a vertical call spread, the key inputs are:

Long-call strike
Short-call strike
Same expiration
Net debit
Net delta
Net theta
Net vega
Maximum loss
Maximum profit
Breakeven
Estimated spread value at different SPY prices and dates
The spread’s Greeks are approximately:

Net delta
=
long-call delta
−
short-call delta
Net delta=long-call delta−short-call delta

Net theta
=
long-call theta
−
short-call theta
Net theta=long-call theta−short-call theta

Net vega
=
long-call vega
−
short-call vega
Net vega=long-call vega−short-call vega

So if your long call has a delta of 0.55 and your short call has a delta of 0.25, the spread’s approximate delta is 0.30. A $1 rise in SPY would initially increase the spread’s value by roughly $30 per contract, before other factors change.

For example:

Buy the $775 call, delta 0.55
Sell the $785 call, delta 0.25
Net delta: approximately 0.30
Pay $3.80 debit
Maximum loss: $380
Maximum profit: $620
You should enter the actual combined order into the calculator as:

Buy 1 × 775 call and sell 1 × 785 call

Do not model only the $775 call and then subtract the cost of the $785 call manually. That can give misleading results because the two options respond differently to SPY price, time decay, and implied volatility.

What to test in the calculator
For each candidate spread, test several SPY prices and dates. For example:

Scenario SPY price Time
Modest rise Current price + $3 1 week later
Target rise Current price + $5 2 weeks later
Strong rise Current price + $10 3 weeks later
No movement Current price 2 weeks later
Adverse move Current price − $3 1 week later
Use the same implied volatility first so you can isolate the effect of SPY movement and time. Then run a second test with implied volatility lower and higher. This matters because an outright long call is more exposed to volatility changes than a debit spread, but the spread is not immune.

Compare candidate spreads by looking at:

How much the spread gains if SPY rises $5
How much it gains if SPY rises $10
What happens if SPY does nothing for one or two weeks
The loss if SPY falls $3–$5
The percentage return on your debit
Whether the maximum profit is realistic
The bid–ask spread and commissions
One correction to the phrase “best delta”: there is no universally best delta. A higher-delta long call costs more but behaves more like SPY. A lower-delta call costs less but needs a larger move and may lose value quickly.

A practical comparison might be:

0.60-delta long call / 0.25-delta short call
0.50-delta long call / 0.20-delta short call
0.40-delta long call / 0.15-delta short call
Then compare the net debit and net delta of each complete spread.

For your $300–$400 risk limit, the final order must satisfy:

Debit
≤
$
4.00
Debit≤$4.00

for one contract, before commissions and currency effects. But don’t simply choose the cheapest spread. A very cheap spread may have a low probability of reaching your profit target.

Also check the spread’s maximum profit before entering:

Maximum profit
=
(
short strike
−
long strike
−
debit
)
×
100
Maximum profit=(short strike−long strike−debit)×100

For example, a $10-wide spread bought for $3.80 has a maximum profit of $620. That gives room for a $300–$500 target. A $5-wide spread bought for $3.80 has only $120 maximum profit, so it cannot meet your target no matter how strongly SPY rises.

So your process should be:

Choose the expiry.
Select several possible long strikes by delta.
Select several short strikes by delta and spread width.
Enter each complete spread into the calculator.
Test SPY price and time scenarios.
Check maximum loss and maximum profit.
Inspect the live bid–ask spread in IBKR.
Paper trade the setup before using real money.
The most important number from the calculator is not the predicted gain. It is whether the spread still has an acceptable outcome when SPY moves less, moves later, or moves against you.

You said
Great will do some more testing & just to confirm, options are not traded or are traded much less during extended trading hours.

Duck.ai said
For regular US equity and ETF options such as SPY and QQQ, assume they are not tradable during extended stock-market hours. Their normal trading session is generally 9:30 a.m. to 4:00 p.m. Eastern Time on US trading days. Some index options and certain products have different hours, but standard SPY and QQQ options should not be treated like stocks that can be traded overnight.

The underlying ETFs can move in premarket or after-hours trading, but your option position usually cannot be closed during that period. This creates gap risk:

SPY rises after hours, but your call spread cannot be sold until the next options session.
SPY falls after hours, and the position may open at a significantly lower value.
A stop order generally cannot execute while the option market is closed.
The displayed option price outside normal hours may be stale or indicative rather than a firm executable quote.
For your plan, this means overnight risk remains even with a 65–90 DTE spread. The maximum loss of a properly constructed debit spread is still limited to the debit paid, but the next available exit price may be much worse than expected.

When testing trades, note:

The US options session in your Australian time zone
Whether the trade is open across a US market close
Any major scheduled event before the next session, such as CPI, jobs data, Federal Reserve announcements, or major geopolitical risk
Whether SPY is approaching its ex-dividend date if your spread contains a short call
Before submitting an IBKR order, check the contract’s displayed trading hours because product hours can vary. For ordinary SPY and QQQ ETF options, however, plan on managing the position during regular US options hours only.

You said
Yep I’m on it.

Duck.ai said
Good plan. Keep the testing simple and record each setup consistently: strikes, DTE, debit, net delta, maximum loss, maximum profit, SPY’s move, and the spread’s value after one week.

That will give you much more useful information than relying on isolated winning examples.