0DTE Credit Spread Strategy: Rules-Based Premium Selling on SPY and QQQ

What is a 0DTE credit spread?

A 0DTE credit spread is a defined-risk, single-sided premium-selling strategy where you sell a closer-to-the-money option and buy a further out-of-the-money option of the same type and expiration. You collect a net credit at entry. The trade profits if the underlying stays on your side of the short strike through the close, and the maximum loss is fixed at the spread width minus the credit received.

It is the directional cousin of the iron condor. Where an iron condor sells both sides simultaneously and bets on a range, a credit spread sells one side and bets on direction (or at least, "not in the wrong direction"). On 0DTE, this matters: directional credit spreads put theta and a small directional edge on the same side, which is a more efficient way to monetize a regime than buying outright calls or puts.

This guide covers the bull put spread (bullish bias) and the bear call spread (bearish bias), filtered by the same 4-timeframe scoring system you use everywhere else on the platform.

Why Credit Spreads Work on 0DTE

Theta Is on Your Side

Same-day expiration means time decay is concentrated into a 6.5-hour window. As long as the underlying does not blow through your short strike, every minute that passes shrinks the option's extrinsic value — and shrinks the credit you'd need to pay back to close the position. By the final hour, your max profit is essentially locked in if you're still on the right side.

Defined Risk Means Defined Sizing

Unlike naked options or directional long calls/puts, a credit spread's max loss is the spread width minus the credit. A 1-point SPY spread sold for 0.30 has a max loss of 0.70 — exactly. You can size to the dollar, never wake up to a margin call, and never blow up an account on a single bad fill.

Directional Edge + Premium = Two Ways to Win

A long call needs the underlying to move up to make money (theta is fighting you). A bull put credit spread makes money if the underlying goes up, sideways, or even mildly down — anywhere except blowing through your short put. That asymmetry is why credit spreads have higher base win rates than directional buying.

Bull Put Spread vs Bear Call Spread

Setup	Direction Bet	Sell	Buy	Profits If
Bull Put Spread	Bullish	OTM put (closer to spot)	OTM put (further from spot)	Underlying stays above short put
Bear Call Spread	Bearish	OTM call (closer to spot)	OTM call (further from spot)	Underlying stays below short call

Both have:

• Defined max loss (spread width − credit)
• Defined max gain (credit received)
• Theta working in your favor
• Delta exposure on the side of your bias

Step 1: Confirm Direction with the Composite Score and Regime Cards

Credit spread direction is dictated entirely by the regime. Do not pick a side first and then look for confirmation.

Bull put spread requires:

• Composite score ≥ +4
• 1-hour regime card bullish (mandatory — the dominant trend lens)
• Alignment of 3/4 or 4/4 bullish across 2m / 5m / 15m / 1h

Bear call spread requires:

• Composite score ≤ −5
• 1-hour regime card bearish (mandatory)
• Alignment of 3/4 or 4/4 bearish

Composite scores between −4 and +4, or alignment of 1/4–2/4, signal chop. Skip credit spreads on those days — premium selling on a chop day either pays you tiny credits (because IV is low) or whipsaws you into the wrong side.

Step 2: Select Strikes

The short strike sets your win rate. The spread width sets your risk-reward.

Short strike placement

• Default: 0.30 delta short. This typically sits 0.5–1.0% out-of-the-money on SPY 0DTE in normal volatility.
• Higher conviction (score above ±7): 0.35–0.40 delta short. Bigger credit, less buffer.
• Lower conviction (score 5–6): 0.20–0.25 delta short. Smaller credit, bigger buffer — preserve the win rate when the regime is borderline.

Spread width

• SPY: 1-point or 2-point wide. 1-point is the cleanest — easy to size, $100 max loss per spread minus credit. Use 2-point only when you want larger credits per spread without doubling contract count.
• QQQ: 1-point or 2-point. QQQ trades more like SPY at $580 than at $440, so 1-point spreads are still meaningful ~0.17% wide.

Avoid 5-point or wider spreads on 0DTE — gamma risk into the close on the long leg is real, and you're effectively buying a useless tail.

Step 3: Time the Entry

The sweet spot is 9:45–11:30 AM CT (10:45 AM – 12:30 PM ET):

• The opening 15-minute volatility has settled
• Regime cards have stabilized
• IV is still elevated enough that credits are meaningful
• You have 4–5 hours of theta runway before close

Avoid:

• Before 9:30 AM CT: regime cards are still settling, IV is unreliable
• After 1:30 PM CT: too little time for theta to compensate for any adverse move
• The final hour: gamma risk into close — small underlying moves cause outsized losses

Step 4: Manage the Trade

Credit spreads on 0DTE are largely unmanaged. Adjustments rarely help on a same-day timeframe — you either let it work, take profits early, or stop out.

Take profits at 50–70% of max

The standard rule: when 50–70% of max profit is captured, close. Don't be a hero. The last 30% of theta comes in the final hour with the most gamma risk — the trade is asymmetric against you at that point.

Stop on regime flip

If you opened a bull put spread when the 1-hour card was bullish, and by midday the 1-hour card flips to bearish or the composite score drops below 0, your thesis is broken. Close the trade — even at a small loss — rather than let it work into max loss.

Hard stop at 2x credit

A 0.30 credit spread should be closed if it loses 0.60 (200% of credit received). This is half the max loss but stops the bleeding before the final-hour gamma takes over.

Step 5: Exit Rules

• Profit target: close at 50–70% of max profit, anytime during the day
• Time stop: flatten by 3:30 PM CT (3:00 PM ET) regardless of P&L — gamma risk in the last 30 minutes is unrewarding
• Regime flip: close immediately when the 1-hour card flips against you or composite score crosses zero
• Stop loss: close at 2x credit received

Do not roll spreads on 0DTE. There is no next-day to roll into.

Common Mistakes

1. Selling too close to ATM: the credit looks great (a 0.45 delta short collects ~50% of the spread width) but the win rate collapses. 0.30 delta is the textbook sweet spot for 0DTE.

2. Trading both directions on the same day: bull put in the morning, bear call after a pullback. This is whipsaw bait. Pick one direction based on the day's regime and stick with it. If the regime flips, stop trading, don't flip with it.

3. Selling on chop days: low composite score + weak alignment = no edge. The credit is small, the underlying drifts unpredictably, and theta barely covers the bid-ask. Skip the day.

4. Holding to expiration: gamma risk in the final 30 minutes can take a 60%-of-max-profit position to a max-loss position in 5 minutes. Always exit by 3:30 PM CT.

5. Wrong-side leg fills: when filling 1-point spreads on SPY, sometimes the long leg fills last. If you can't get both legs filled within 30 seconds, cancel the order. A naked short put on 0DTE without the long leg is a different strategy entirely (and a much worse one).

Credit Spread vs Iron Condor: When to Use Each

Condition	Best choice
Strong directional regime (alignment 3/4+, score ±4+)	Credit spread (one side aligned with the trend)
Range-bound regime (alignment ≤ 2/4, score between −4 and +4)	Iron condor (sell both sides)
FOMC / NFP / CPI day	Neither — wait for IV crush, then re-evaluate
Last hour of the session	Neither — gamma risk too high

The deeper rule: a credit spread is essentially "half an iron condor in the direction of the trend." When the regime is clear, you don't need the other wing — you'd just be giving away credit on the side that's about to be tested. When the regime is muddled, you want both wings because you don't know which way it'll resolve.

For the iron condor playbook, see the 0DTE iron condor strategy post.

Key Takeaways

• A 0DTE credit spread is a defined-risk, single-sided premium-selling strategy — use it when the regime gives you a clear directional bias
• Bull put spreads in bullish regimes (1h card bullish, score ≥ +4, alignment ≥ 3/4); bear call spreads in bearish regimes (mirror conditions)
• Default to the 0.30 delta short strike with a 1-point or 2-point spread width
• Enter between 9:45 and 11:30 AM CT for the best balance of premium and theta runway
• Take profits at 50–70% of max, stop at 2x credit, exit by 3:30 PM CT regardless
• Never roll on 0DTE; never hold into the final 30 minutes; never trade both directions on the same day

The credit spread is one of seven approaches in our complete 0DTE options strategy guide. Pair it with iron condors for range days and directional plays for trend days, and you have a full toolkit for any regime.

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Check today's composite score and 1-hour regime card on the 0DTE Dashboard before opening a credit spread.