Guides

The mechanics of 0DTE expiration, sourced and dated; the broker tracker; the tax calculator; how the numbers on this site are made.

What happens if my SPX 0DTE expires in the money?cash-settled · intrinsic × 100 · no shares
What happens if my SPY 0DTE expires in the money?auto-exercise ≥ $0.01 · 100 shares · T+1
What happens if my QQQ 0DTE expires in the money?auto-exercise ≥ $0.01 · 100 shares · T+1
Can you get assigned on SPX 0DTE?European-style · no early assignment
SPX 0DTE spread at expirationboth legs cash · net ≤ width × 100
Missed the exercise cutoff?OCC 5:30pm ET · broker windows earlier
How much can you lose on a 0DTE?long: debit × 100 · short call: no cap · spread: width − credit
How much capital for 0DTE?worst case × contracts · PDT minimum gone 2026-06-04 · no sizing advice
PDT-repeal broker trackerwhat each broker does after June 2026, dated and sourced
SPX vs SPY §1256 tax calculatorsame trade, different tax; run your own number
Methodologywhy every pin number is approximate, including ours
How to cite usCC BY 4.0 for the measured numbers