How Wide Should a Vertical Spread Be? Choosing Strike Width by Risk, Not Premium in 2026
October 30, 2026
14 min read
How wide should a vertical spread be? Wide enough that the trade can pay you for being right, and narrow enough that being wrong costs no more than your plan allows. Vertical spread width is the distance between the two strikes, and it sets the maximum value of the spread. Every other number in the trade, from the cost to the maximum loss to how the position moves during the day, follows from that one choice.
Most traders pick width by habit. They use the strikes they used last time, or the ones that make the premium look nice, or whatever the platform puts next to each other on the chain. Then they size the trade afterward. That order is backward. Width is a risk decision first and a market opinion second.
In this guide we'll cover what vertical spread width means and why it caps the trade, what changes as a spread gets wider, how to choose a width by starting from your risk budget, the width mistakes that cost traders the most, and how width fits inside the daily loss limit, drawdown and contract cap of a TradeFundrr simulated options account.
Key Takeaways
- Treat width as the size of the box. The width times 100 is the most a one-lot vertical can ever be worth. Your maximum loss and maximum gain must add up to that number.
- Start from dollars at risk, not from premium. Decide what one trade may cost you, then find the width and contract count that fit inside it.
- Expect a wider spread to act more like a single option. More width means more net delta, so the position moves faster during the day in both directions.
- Check the bid-ask on both legs before choosing a narrow spread. On a $1 wide spread, crossing the market on entry and exit can eat a large share of the maximum gain.
- Keep the defined maximum loss of everything open well below your daily loss limit. A defined-risk trade is only defined if the definition fits your account rules.
Table of Contents
- What does vertical spread width mean?
- Narrow vs wide: what changes as the spread gets wider
- How to choose vertical spread width from your risk budget
- Common spread width mistakes
- Vertical spread width in a TradeFundrr funded account
What does vertical spread width mean?
Vertical spread width is the distance between the long strike and the short strike, in the same expiration. A 100/105 call spread is $5 wide. Because each standard equity option covers 100 shares, at expiration, a $5 wide spread is worth somewhere between $0 and $500 per spread.
If you need a refresher on the structure itself, our guide to vertical spreads for defined risk covers the four basic verticals. This post assumes you know what a vertical is and focuses on one decision: how far apart to put the strikes.
Width sets the ceiling, and the ceiling is shared
Every vertical spread splits its width between two outcomes. For a debit spread, you pay a debit up front. That debit is your maximum loss. The rest of the width is your maximum gain. The Options Industry Council's page on the bull call spread puts it the same way: the maximum loss is the initial outlay, the net debit, and the maximum profit is the difference between the two strike prices less that debit.
For a credit spread, the split runs the other way. You collect a credit up front. That credit is your maximum gain. The width minus the credit is your maximum loss. The OIC page on the bull put spread describes the maximum loss as the difference between the strikes, less the credit received.
So the arithmetic is fixed. Maximum loss plus maximum gain equals width times 100. You do not get to change that. You only get to choose how big the box is and how the market prices the split inside it.
Why width matters more than it looks on the chain
On an options chain, a $1 wide spread and a $10 wide spread look like neighbors. They are not. The $10 spread has ten times the box. It costs more, it can lose more, it can make more, and it reacts more to every move in the stock. Picking width is closer to picking position size than it is to picking a price.
That is the most useful way to think about it. Width is one of your sizing levers. Contract count is the other. Both multiply your risk, and you have to set them together.
Narrow vs wide: what changes as the spread gets wider
A wider vertical spread costs more, risks more in dollars and can pay more in dollars. It also tends to offer a better ratio of maximum gain to maximum loss, a breakeven further from the current price and a larger net delta. A narrow spread is cheaper and moves less, but it gives back more of its value to costs.
Spread width, side by side
Wider spread, bigger box
Debit call spreads on a hypothetical $100 stock, one expiration. The whole bar is the box: width × 100. Amber is what you pay and can lose. Teal is what is left to gain.
Same $400 risk budget, three widths
$1 wide
7 spreads fit. $385 max loss, 14 contracts across two legs.
$5 wide
1 spread fits. $240 max loss. A second would make $480.
$10 wide
Does not fit. One spread risks $410, over the budget.
tradefundrr.com
Illustrative example. Invented prices for a hypothetical stock, before commissions. Not a recommendation.
Cost and maximum loss grow with width
Take a hypothetical stock trading at $100 and three debit call spreads in the same expiration, each buying the 100 call. The prices below are invented to show the shape, not quotes from any market. Notice that the debit grows with width, but more slowly than the width does. The $10 spread is ten times as wide as the $1 spread and costs about seven and a half times as much.
| Spread | Width | Debit (max loss) | Max gain | Gain to loss | Breakeven at expiration | Debit as % of width |
|---|---|---|---|---|---|---|
| 100 / 101 calls | $1 | $55 | $45 | 0.82 to 1 | $100.55 | 55% |
| 100 / 105 calls | $5 | $240 | $260 | 1.08 to 1 | $102.40 | 48% |
| 100 / 110 calls | $10 | $410 | $590 | 1.44 to 1 | $104.10 | 41% |
Illustrative example: invented prices for one-lot debit call spreads on a hypothetical $100 stock, before commissions. Wider spreads cost more in dollars but less as a share of the width, so the gain-to-loss ratio improves while the breakeven moves further away.
Better ratio, further breakeven
The wider spread's better gain-to-loss ratio is not free. Its breakeven sits at $104.10 instead of $100.55. The stock has to travel further before the trade makes money at expiration, and further again to reach the maximum gain at $110. A narrow spread pays less, but it pays on a smaller move.
This is the trade-off in plain terms. Narrow spreads ask for less from the market and give you less back. Wide spreads ask for more and give more. Neither is better in general. The question is whether the move you expect, inside the time you plan to hold, reaches the strike you are selling.
On the credit side the same logic holds in reverse. Selling a 95 put against a $100 stock, an invented credit of $0.30 on a $1 wide spread risks $70 to make $30. An invented credit of $1.90 on a $10 wide spread risks $810 to make $190. The wider credit spread collects more, but its credit is a smaller share of its width, so you risk more dollars for each dollar you can make. Our comparison of debit spreads vs credit spreads goes deeper on that difference.
How the spread moves during the day
Width also changes how the position behaves before expiration. A vertical's net delta is roughly the delta of the long option minus the delta of the short option. Moving the short strike further away removes less delta, so a wider spread carries more net delta and behaves more like a single long option.
Illustrative example: if the 100 call has a delta near 0.52, a 101 call near 0.47, a 105 call near 0.27 and a 110 call near 0.10, the $1 spread's net delta is about 0.05, the $5 spread's about 0.25 and the $10 spread's about 0.42. A $1 move in the stock changes their values by roughly $5, $25 and $42 per spread. That matters a great deal if you plan to exit the same day, because you will live with those intraday swings long before you ever see the expiration numbers.
How to choose vertical spread width from your risk budget
Choose vertical spread width by working backward. First set the most one trade may cost you. Then pick the short strike from where you expect the move to stop. Then check that the width and contract count together keep the maximum loss inside your budget, and that the bid-ask on both legs leaves the trade worth taking.
Step one: set the dollar risk before you open the chain
A defined-risk trade is only useful if the definition is a number you chose. Decide what a full loss on this trade may cost, in dollars, before you look at strikes. Many traders use a fixed amount per trade or a small share of the account. Our guide to options position sizing walks through both methods.
Once you have that number, width and contract count become a simple fit problem. Illustrative example: with a $400 budget and the prices in the table above, you can buy seven of the $1 spreads for $385 of maximum loss, or one of the $5 spreads for $240. You cannot buy even one of the $10 spreads, because a single one risks $410. The budget makes the decision for you, which is the point.
Step two: put the short strike where your idea ends
The short strike is not a premium dial. It is your target. If you expect a stock to rally to about $104 by the time you exit, selling the 110 call means paying for $6 of move you do not expect to get. Selling the 101 call caps you a long way below your own target. A short strike near where you expect the move to stall usually gives the cleanest trade.
Step three: check the bid-ask on both legs
Every vertical has two bid-ask spreads, one per leg, and you pay them on the way in and the way out unless you get filled at or near the middle. Illustrative example: if each leg has a market $0.10 wide and you cross half of it on each leg at entry and again at exit, the friction is about $0.20 per spread, or $20.
On the $1 wide spread with $45 of maximum gain, that $20 is about 44% of everything the trade can make. On the $5 wide spread with $260 of maximum gain, it is about 8%. Narrow spreads are cheap to buy and expensive to trade. Before you go narrow, look at the quotes on both legs, not just the spread's mid price.
Common spread width mistakes
The most common vertical spread width mistakes are going wide to collect a bigger credit, going narrow to stack more contracts, choosing strikes by how the premium looks, and ignoring the bid-ask on each leg. Each one hides a sizing decision inside what feels like a strike decision.
Going wide for the credit
A wider credit spread brings in more money up front, and that feels like a better trade. It often is not. In the credit example above, moving from $1 wide to $10 wide raised the credit from $30 to $190 but raised the maximum loss from $70 to $810. If that trade goes wrong on a bad day, a single position can consume most of a daily loss limit. A bigger credit is a bigger position, not a better price.
Going narrow to stack contracts
The opposite mistake is choosing a $1 wide spread and buying ten or twenty of them because each one is cheap. The maximum loss adds up exactly as it would on fewer, wider spreads, but now you have more contracts paying more friction, and you may run into a contract limit. If your commissions are charged per contract, they scale with the count too. Twenty narrow spreads are not twenty small trades. They are one large trade split into pieces.
Choosing strikes by premium, not by plan
"This one pays $1.00" is not a reason to pick a strike. Premium is the market's price for the width you chose and how far the strikes sit from the stock. It says nothing about whether your idea reaches the short strike. Start with the plan, then let the premium tell you whether the plan is worth the price.
- Write the dollar amount a full loss on this trade may cost you.
- Name the price where you expect the move to stall, and put the short strike near it.
- Calculate the maximum loss: the debit paid, or the width minus the credit, times 100, times contracts.
- Confirm the total maximum loss fits your per-trade budget and sits well inside your daily loss limit.
- Check the bid-ask on both legs and estimate the round-trip cost against the maximum gain.
- Check the net delta, so you know roughly how much the spread moves per $1 in the stock.
- Count the contracts per leg against your account's contract cap.
- Decide your exit before entry: a profit level, a loss level and a time to close.
Vertical spread width in a TradeFundrr funded account
In a TradeFundrr simulated options account, spread width is how you fit a trade inside the account's rules. Spreads are supported, the daily loss limit is $1,000 and pauses trading for the session, the $3,000 maximum drawdown trails your highest end-of-day balance and closes the account if reached, and trading is intraday only.
Fit width to the daily loss limit and drawdown
Both the Pre-Prop evaluation and the Prop funded account give you $25,000 in simulated buying power, a $1,000 daily loss limit and a $3,000 trailing drawdown. A defined maximum loss makes those rules easier to respect, but only if you size for them. One $10 wide credit spread with an $810 maximum loss can use most of a day's limit on its own. Three bad days at the full daily limit would use the whole drawdown.
A simple habit helps: add up the maximum loss of every spread you have open and keep that total well below $1,000. Then a worst case on every open trade still leaves room under the limit. Credit-based positions are allowed up to account buying power, so check how the platform counts a spread against your buying power before you size up.
Mind the contract cap per leg
Each TradeFundrr options program limits the number of contracts per leg, and the cap differs between Pre-Prop and Prop. Confirm the current figure in your own account terms. Width interacts with this directly. If your risk budget only works with many narrow spreads, you may hit the cap before you hit the budget. A slightly wider spread with fewer contracts often fits the same risk with less friction and fewer contracts per leg.
Intraday only changes what width means
TradeFundrr options accounts trade intraday only, Monday through Friday from 9:30 AM to 3:55 PM ET, with no swing positions. That makes intraday behavior the main event. The expiration math still matters, because it is your worst and best case, but most of the time you will close long before the spread reaches either number. Net delta and the bid-ask on both legs do more to decide your result than the full width does.
Assignment and pin risk are live-market events
In a live brokerage account, a short leg can be assigned early, and a short strike that finishes near the stock price at expiration creates pin risk: uncertainty about whether you will be assigned and end up holding shares you did not plan for. The OIC notes that holding a spread into expiration adds risk, most of all when the stock trades near the short strike. Index options such as SPX avoid share delivery entirely, because Cboe describes them as cash-settled and European-style, exercisable only at expiration.
None of this happens inside a TradeFundrr simulated account. No real trade is executed, so no counterparty exercises, no shares are delivered and no assignment notice arrives. And because positions are intraday only, you are not holding spreads into the close of expiration day in the first place. It is still a skill worth building. If you ever trade spreads with your own money in a live brokerage account, choosing a width you can hold through a bad open, and knowing what happens near the short strike at expiration, is part of trading them properly.
Payouts are where the money becomes real. Payouts from a TradeFundrr funded account are real money, paid by TradeFundrr from its own funds, and they depend on following the account rules. They are never guaranteed. Width will not make you profitable. It will make sure your losses stay the size you planned, which is what keeps an account open long enough to find out whether you are.
Frequently Asked Questions
How wide should a vertical spread be?
Wide enough to reach your target and narrow enough that the maximum loss fits your risk budget. Set the dollar risk first, place the short strike near where you expect the move to stall, then pick the width and contract count that keep the total maximum loss inside your plan.
Is a wider vertical spread riskier?
Per spread, yes, because a wider spread has a larger maximum loss in dollars. Per dollar risked, not necessarily. Three narrow spreads can risk as much as one wide spread. Total risk depends on width and contract count together, so compare the total maximum loss, not the width alone.
Why is a $1 wide spread more expensive to trade than it looks?
Because the bid-ask on both legs is large relative to its small maximum gain. Crossing a $0.10 market on each leg at entry and exit can cost about $20 per spread, which is a large share of a $1 wide spread's value and a small share of a $5 wide spread's.
Does spread width change how fast the position moves?
Yes. A wider vertical keeps more of the long option's delta, so its value changes more for each $1 move in the stock. A narrow spread barely reacts until the stock is close to the strikes or expiration is near. For intraday trading, that difference often matters more than the expiration payoff.
Can I trade vertical spreads in a TradeFundrr funded account?
Yes. TradeFundrr's options accounts support spreads, iron condors and butterflies, and credit-based positions are allowed up to account buying power. Trading is intraday only, and the account's daily loss limit, trailing drawdown and per-leg contract cap all apply, so size every spread with those rules in mind.
How should I size a vertical spread to fit a $1,000 daily loss limit?
Keep the combined maximum loss of all your open spreads well below $1,000. Calculate each spread's maximum loss, the debit or the width minus the credit, times 100 and times contracts, and add them up. If a single spread uses most of the limit, choose a narrower width or fewer contracts.
Do I have to worry about assignment on a short leg in a TradeFundrr account?
No. Assignment and early exercise are live-market events, and no real trade is executed in a TradeFundrr simulated account. Positions are also closed intraday. Understanding assignment and pin risk is still worth learning as a live-ready skill for any spreads you trade with your own money.
Does the contract limit affect which width I should choose?
It can. TradeFundrr options programs cap contracts per leg, and the cap differs by program, so confirm it in your own account terms. If your risk budget only works with many narrow spreads, a somewhat wider spread with fewer contracts may fit the same risk inside the cap.
Choose the width, then practice keeping the risk
TradeFundrr's simulated options accounts support spreads and publish the $1,000 daily loss limit and $3,000 trailing drawdown up front, and the Pre-Prop evaluation has no time limit, so you can learn to size defined-risk trades without rushing.
Get Funded →