Put & Call Credit Spreads Explained for 0DTE Traders

Not every 0DTE trade needs to be a naked directional bet. Credit spreads are a powerful way to collect premium with fully defined risk — you know your maximum profit and maximum loss before the trade even opens. They're especially effective on flat or slow days when a naked call or put would bleed out from theta decay.

This guide walks through exactly how put credit spreads and call credit spreads work, how to calculate your numbers, and when each setup makes the most sense in a 0DTE context.

What Is a Credit Spread?

A credit spread involves simultaneously buying and selling two options of the same type (both calls or both puts) on the same underlying, with the same expiration but different strikes. You collect more premium on the option you sell than you pay for the one you buy — the difference is your net credit, which is your maximum profit.

The long leg (the option you buy) exists purely to cap your risk. Without it, selling a naked option exposes you to theoretically unlimited loss. The spread turns it into a defined-risk trade — something your broker (and your account) can actually handle.

Put Credit Spread: Bullish / Neutral Setup

How It Works

You sell a put at a higher strike and buy a put at a lower strike. You want the underlying to stay above your short strike by expiration so both options expire worthless and you keep the full credit.

The Math

• Max Profit = Credit received × 100 = $0.90 × 100 = $90
• Max Loss = (Spread width − Credit received) × 100 = ($3.00 − $0.90) × 100 = $210
• Breakeven = Short strike − Credit received = $487.00 − $0.90 = $486.10

When to Use a Put Credit Spread

• QQQ or SPY is trading above a well-defined support level
• The broader market trend is flat to bullish
• You want to collect premium without a strong directional conviction
• IV is elevated — you're selling into fear to collect richer premium
• The midday consolidation period (12–2 PM) when directional plays are hard

Call Credit Spread: Bearish / Neutral Setup

How It Works

You sell a call at a lower strike and buy a call at a higher strike. You want the underlying to stay below your short strike by expiration. The trade profits from the underlying going sideways or down — the sold call expires worthless and you keep the credit.

The Math

• Max Profit = Credit received × 100 = $0.95 × 100 = $95
• Max Loss = (Spread width − Credit received) × 100 = ($3.00 − $0.95) × 100 = $205
• Breakeven = Short strike + Credit received = $724.00 + $0.95 = $724.95

When to Use a Call Credit Spread

• SPY has rejected off a key resistance level
• Market is overbought intraday and showing signs of fading
• You want to fade a move without committing to outright puts
• High IV environment — premium is fat and worth selling

Credit Spreads vs Naked Calls/Puts

Managing a Credit Spread During the Session

Taking Profits Early

Many experienced traders close credit spreads at 50% of max profit rather than holding to expiration. If you sold a spread for $0.90 and it's now worth $0.45, closing it locks in $45 and removes the risk of a late-day reversal wiping out your gain. This is especially relevant in 0DTE, where the last hour can be explosive in either direction.

When to Cut the Loss

If the underlying approaches your short strike, the spread will be approaching maximum loss. A common rule is to close the spread when it reaches 2× the credit received in losses — so if you sold for $0.90, close if the spread is trading at $1.80. This prevents the full max loss from being realized on every losing trade.