For a same-day SPY day trade, 0DTE (expires today) is the natural choice — but understanding why, and when to step to 1DTE, helps you choose deliberately rather than by default.

Why 0DTE fits a day trade

0DTE options are cheap (minimal time premium left), responsive (near-the-money 0DTE tracks SPY closely intraday), and carry no overnight risk (they expire today, so you're not holding through the night). For a trade you'll open and close the same session, that's an ideal fit — you're paying only for the move you expect and nothing extra. It's why 0DTE is the scalper's default.

The catch: fast decay

The tradeoff is brutal time decay — 0DTE options lose extrinsic value fast and accelerate into the close, so hesitation and chop are punished (they can expire worthless quickly). You need the move to happen reasonably promptly. If you want a bit more time cushion — a slower-bleeding option for a trade that may take longer — stepping to 1DTE (0DTE vs 1DTE) trades some responsiveness for less decay pressure.

0DTE is the day trader's expiry: cheap, sharp, no overnight risk — as long as you respect that the clock runs out today and decay is merciless.

The quick takeaway

For most same-day SPY trades, 0DTE is the right expiration — just respect the fast decay. Step to 1DTE when you want a slower clock. For a beginner's first trades, understand the decay before you lean on 0DTE. NoVo is built around the 0DTE/1DTE window and manages the decay pressure through disciplined, prompt exits.