Mechanics · SPX · SPY · QQQ 0DTE · capital as loss arithmetic · verified 2026-09-25
How much capital do you need for 0DTE? Start from what one contract can lose
A long SPX 7700 call bought at 2.40 can lose at most debit × 100 = $240 per contract. A short SPX 7700 call sold at 2.40 has no cap: (close − strike − credit) × 100, which is $5,760 per contract at a 7,760 close. A 10-wide SPX 7700/7710 call spread sold for 4.20 can lose at most (width − credit) × 100 = $580 per contract. N contracts multiply each figure — so the capital question is: how many of those worst cases can the account absorb and still be there tomorrow. This page shows the arithmetic; it does not pick a number for you.
Instrument facts last verified 2026-09-25 · broker rows last verified 2026-09-25
Written and verified by the 0dteclose desk · methodology · corrections: corrections@0dteclose.com
Run it on your own position
See what 4:00 does to your SPX strike
Prefilled with a 7700 call bought at 2.40 — enter your own strike and price; the readout uses the 15-min delayed CBOE quote.
| Position | Max / worked loss formula | 1 contract | 5 contracts | 10 contracts | Source |
|---|---|---|---|---|---|
| SPXW contract specification | European-style, cash-settled, multiplier 100: every dollar figure below is points × 100 per contract, times contracts | www.cboe.com verified 2026-09-25 | |||
| Multiplier and settlement | 100 per contract; cash-settled to the official 4:00pm ET closing value — every row below is points × 100 | www.cboe.com verified 2026-09-25 | |||
| Long 7700 call @ 2.40 | debit × 100 | −$240 | −$1,200 | −$2,400 | loss arithmetic same formulas as the loss page |
| Long 7700 put @ 2.40 | debit × 100 | −$240 | −$1,200 | −$2,400 | loss arithmetic same formulas as the loss page |
| Short 7700 call @ 2.40, close 7760.00 | (close − strike − credit) × 100; no cap (cash debit, next business day) | −$5,760 | −$28,800 | −$57,600 | loss arithmetic same formulas as the loss page |
| Short 7700 put @ 2.40, close 7640.00 | (strike − close − credit) × 100; capped at (strike − credit) × 100 = $769,760 only if the index went to zero | −$5,760 | −$28,800 | −$57,600 | loss arithmetic same formulas as the loss page |
| Long 7700/7710 call vertical @ 4.20 debit | debit × 100 | −$420 | −$2,100 | −$4,200 | loss arithmetic same formulas as the loss page |
| Short 7700/7710 call vertical @ 4.20 credit | (width − credit) × 100 | −$580 | −$2,900 | −$5,800 | loss arithmetic same formulas as the loss page |
| Iron condor 7650/7640 puts + 7750/7760 calls @ 2.10 | (width − credit) × 100, one side only | −$790 | −$3,950 | −$7,900 | loss arithmetic same formulas as the loss page |
| Position | Max / worked loss formula | 1 contract | 5 contracts | 10 contracts | Source |
|---|---|---|---|---|---|
| SPY multiplier and settlement | 100 shares per contract; physically settled at the strike, T+1 | www.cboe.com verified 2026-09-25 | |||
| SPY auto-exercise / assignment | In the money by 0.01 or more at the 4:00pm ET close: long exercised, short assigned — 100 shares per contract | www.optionseducation.org verified 2026-09-25 | |||
| Long 650 call @ 0.85 | debit × 100 | −$85 | −$425 | −$850 | loss arithmetic same formulas as the loss page |
| Short 650 call @ 0.85, close 656.00 | (close − strike − credit) × 100; no cap + 100 shares per contract delivered short at 650, T+1 | −$515 | −$2,575 | −$5,150 | loss arithmetic same formulas as the loss page |
| Short 650/652 call vertical @ 0.80 credit | (width − credit) × 100 | −$120 | −$600 | −$1,200 | loss arithmetic same formulas as the loss page |
| QQQ multiplier and settlement | 100 shares per contract; physically settled at the strike, T+1 | www.cboe.com verified 2026-09-25 | |||
| QQQ auto-exercise / assignment | In the money by 0.01 or more at the 4:00pm ET close: long exercised, short assigned — 100 shares per contract | www.optionseducation.org verified 2026-09-25 | |||
| Long 580 call @ 0.90 | debit × 100 | −$90 | −$450 | −$900 | loss arithmetic same formulas as the loss page |
| Short 580 call @ 0.90, close 586.00 | (close − strike − credit) × 100; no cap + 100 shares per contract delivered short at 580, T+1 | −$510 | −$2,550 | −$5,100 | loss arithmetic same formulas as the loss page |
| Short 580/582 call vertical @ 0.80 credit | (width − credit) × 100 | −$120 | −$600 | −$1,200 | loss arithmetic same formulas as the loss page |
What one contract can lose, by position type
Every figure in the tables above is the loss page's arithmetic, not a new model: points × 100 per contract, times the number of contracts. A long call or put loses at most the debit — one SPX 7700 call at 2.40 is $240, five are $1,200, ten are $2,400; a SPY 650 call at 0.85 is $85 and a QQQ 580 call at 0.90 is $90. A short call has no ceiling: at a 7,760 close the 7700 call sold at 2.40 loses $5,760 per contract, $57,600 on ten, and every further point adds $100 per contract. A 10-wide credit spread sold for 4.20 stops at (width − credit) × 100 = $580, $5,800 on ten; an iron condor with 10-point wings sold for 2.10 stops at $790, one side only. The full derivation, with SPY and QQQ share delivery, is on how much can you lose on a 0DTE option?; the leg-by-leg spread settlement is on SPX 0DTE spread at expiration.
What the $25,000 PDT minimum has to do with it
The $25,000 pattern-day-trader minimum was eliminated effective 2026-06-04 under the FINRA Rule 4210 pattern-day-trader amendments; brokers phase in their own day-trading margin checks through October 2027, so what actually happens now depends on which broker you use — see the PDT-repeal tracker. Note: cash accounts were never subject to the rule; options proceeds settle next business day. The $25,000 figure was an account-equity rule for day-trading on margin; it never said anything about what a position can lose at the close, and the repeal changes none of the arithmetic above. What remains is broker-by-broker: 3 of the 5 brokers tracked here publish a minimum equity for day-trading on margin (lowest $2,000), per the table below, dated and flagged when unverified. A short SPX call's worked loss at a 60-point adverse close, $5,760, is larger than any of those minimums; a long call's $240 is smaller.
What each broker publishes as a minimum
| Broker | Published minimum equity (day-trading on margin) | Source |
|---|---|---|
| Robinhood | $2,000 | robinhood.com verified 2026-09-25 |
| Charles Schwab (thinkorswim) unverified | $2,000 — Intraday Margin Buying Power (25% requirement, positions must be closed by 8pm ET) for margin accounts with at least $2,000 in cash or eligible securities (from 2026-07-13); no $25k PDT minimum, day trades not counted since 2026-06-08 | www.schwab.com verified 2026-09-25 |
| tastytrade | none — no minimum equity to day-trade in a margin account; dynamic buying power updates in real time (effective 2026-06-04) | support.tastytrade.com verified 2026-09-25 |
| Interactive Brokers | $2,000 — the $25,000 PDT minimum is removed; the standard Reg T $2,000 minimum still applies to trades using margin or short sales | www.interactivebrokers.com verified 2026-09-25 |
| Webull | none published — Webull states 'no more $25k minimum' and 'no more day trade limits'; no replacement minimum is stated on the page | www.webull.com verified 2026-09-25 |
Can you start 0DTE with $500?
Arithmetic only. A long SPX 7700 call at 2.40 costs $240; two cost $480, and both can be worth $0 at 4:00pm ET — an out-of-the-money 0DTE by any amount at the close settles at zero, so $480 of $500 can be gone in one session. A long SPY 650 call at 0.85 costs $85. For a long, the debit is the whole worst case. Selling options and trading spreads are a separate question that the broker answers: each broker decides which options level an account is approved for, and 3 of the 5 brokers tracked here publish a minimum equity for day-trading on margin (lowest $2,000) — the table above and the per-broker tracker carry the published values, dated. One short SPX 7700 call's worked loss at a 7,760 close is $5,760, against an account of $500.
Do you need $25,000 for 0DTE in 2026?
The $25,000 pattern-day-trader minimum was eliminated effective 2026-06-04 under the FINRA Rule 4210 pattern-day-trader amendments; brokers phase in their own day-trading margin checks through October 2027, so what actually happens now depends on which broker you use. Note: cash accounts were never subject to the rule; options proceeds settle next business day. The per-broker record, including each broker's replacement day-trading check, is on the PDT-repeal tracker.
How much can a short 0DTE call lose?
There is no cap. Sell one SPX 7700 call at 2.40 and $240 arrives; at a 7760.00 official close the contract is 60 points in the money and the account is debited $6,000, a net (60 − 2.40) × 100 = $5,760 per contract — $28,800 on five, $57,600 on ten. Every further point above the strike adds $100 per contract. On SPX the debit is cash, posted the next business day; on SPY and QQQ an assigned short call leaves the account short 100 shares per contract, T+1. The worked example comes from how much can you lose on a 0DTE option?, and the cash-settled short side is on can you get assigned on SPX 0DTE?
Why is the answer arithmetic and not a number?
Because the number has three inputs and only two of them are arithmetic: the worst case per contract (the tables above), the number of contracts held into the close, and how much of the account you are willing to see go at one close. The third input is yours. This site does not size positions, does not estimate how likely a loss is, and does not pick an account size; it shows what each position type can cost at 4:00pm ET, at 1, 5 and 10 contracts, from the same formulas as the loss page. The SPX simulator runs your own strike and price at seven closes from the 15-min delayed CBOE quote.
What this page does not tell you
It does not name an account size, and it does not size positions. It does not estimate the probability of any loss: the tables are worst cases and one worked adverse close (60 SPX points, 6 SPY/QQQ points), not a forecast of how far the close will travel — the session archive measures implied versus realized range per session, and the methodology lists what our data can and cannot say. Broker minimums appear only where a broker publishes one, from our broker data, dated and flagged when unverified; options-level approval rules are not listed. Commissions, fees, taxes and margin interest are not in the figures. Not trading, tax or legal advice.
Quick answers
Can you start 0DTE with $500?
Arithmetic only: a long SPX 7700 call at 2.40 costs $240; two cost $480 and both can be worth $0 at 4:00pm ET. Short options and spreads depend on the broker's options-level approval; 3 of the 5 brokers tracked here publish a minimum equity for day-trading on margin (lowest $2,000).
Do you need $25,000 for 0DTE in 2026?
The $25,000 pattern-day-trader minimum was eliminated effective 2026-06-04 under the FINRA Rule 4210 pattern-day-trader amendments; brokers phase in their own day-trading margin checks through October 2027, so what actually happens now depends on which broker you use. Note: cash accounts were never subject to the rule; options proceeds settle next business day.
How much can a short 0DTE call lose?
There is no cap: (close − strike − credit) × 100 per contract. A short SPX 7700 call sold at 2.40 loses $5,760 at a 7760.00 close.
Why is the answer arithmetic and not a number?
Worst case per contract × contracts × how much of the account you accept losing at one close — the last factor is your decision. This site does not size positions or pick an account size.
Related
- How much can you lose? max loss by position type
- SPX expires ITM cash-settled, no shares
- PDT-repeal tracker per-broker status, dated
- SPX simulator your strike at seven closes
- SPX spread settlement width × 100 cap, worked table
- Missed the exercise cutoff? OCC 5:30pm ET vs broker windows
- Methodology sources and limits
Expiration-rule changes, by email
One email when a broker or exchange changes an expiration rule we track. Nothing else.