Same-day expiration options stopped being a niche product years ago. By early 2026, 0DTE contracts accounted for roughly 59% of total SPX options volume — up from about 5% in 2020. That's not a rounding error, it's a structural shift in how the index options market trades.
This guide covers five 0DTE strategies worth knowing, scoped specifically to SPX, XSP, and NDX — not SPY, not QQQ, not single names. That exclusion is deliberate, and the next section explains why. It also clears up what actually changed when FINRA's Pattern Day Trader (PDT) rule was eliminated in June 2026, because that story is getting reported in a way that's technically true and practically misleading.
- 0DTE = ~59% of SPX volume as of early 2026, up from ~5% in 2020
- PDT rule eliminated effective June 4, 2026 — replaced by real-time risk-based margin, not "no limits"
- SPX, XSP, NDX are cash-settled and European-style — no assignment risk, unlike SPY or QQQ
- Broker rollout of the PDT change is staggered, not simultaneous — check your specific broker
Why Index-Only: SPX, XSP, NDX
SPX, XSP, and NDX are broad-based index options. They settle in cash and are European-style, meaning they can only be exercised at expiration — there's no early assignment risk and no overnight surprise from a short leg getting exercised against you. SPY and QQQ are options on ETFs that hold the underlying shares, which makes them American-style and physically settled. An in-the-money short leg on SPY can be assigned at any point before expiration, which is a real operational risk a 0DTE trader doesn't need on top of everything else happening that day.
XSP is the mini version of SPX, sized at 1/10th, built for accounts that want index exposure without the SPX contract's full notional size. NDX gives the same cash-settled, European-style structure for Nasdaq-100 exposure. All three also fall under Section 1256 tax treatment, which blends gains at 60% long-term / 40% short-term rates regardless of how briefly the position was held — a materially different (and often better) outcome than the short-term ordinary income treatment that applies to SPY or QQQ option gains. This isn't tax advice; confirm specifics with a tax professional before relying on it.
What the PDT Repeal Actually Changes (and Doesn't)
FINRA's day-trade counting rule — four or more round trips in five business days, with a $25,000 equity floor to avoid it — was eliminated effective June 4, 2026, following SEC approval in April. In its place: a real-time, risk-based intraday margin framework. Your broker now sizes buying power off actual live exposure instead of counting trades against a fixed threshold.
What that means in practice: you can run as many 0DTE entries and exits in a session as you want without a day-trade counter freezing your account. What it does not mean: unlimited capital. Each open position still draws against real-time margin, and the new framework can actually be less forgiving on undefined-risk positions than the old flat calculation was. Running multiple defined-risk spreads simultaneously still requires the capital to back each one — the gate that's gone is the trade-count gate, not the capital requirement.
The rollout also isn't simultaneous across brokers:
| Broker | Status |
|---|---|
| Webull | Confirmed — June 4, 2026 |
| Charles Schwab | Confirmed — June 8, 2026 |
| E*TRADE | Confirmed — June 9, 2026 |
| Interactive Brokers | Expected early adopter, no public date yet |
| Robinhood | Confirmed it's coming, no specific date announced |
| Fidelity | No announcement yet |
Brokers have until October 20, 2027 to fully comply, so this is a multi-quarter transition, not a single switch-flip. If your broker hasn't moved yet, you're still operating under the old day-trade counter. One more point worth knowing: PDT only ever applied to margin accounts. Cash accounts never had a day-trade cap — they're governed by settlement rules instead, and that hasn't changed.
The Top 5 0DTE Strategies
1. Iron Condor — Defined-Risk Range Play
Structure: Sell an OTM put spread and an OTM call spread, same 0DTE expiration. Four legs, fully defined risk on both sides.
Use when: You expect the index to stay within a range into the close, and implied volatility is rich relative to the move you're actually expecting.
2. Single-Side Credit Spread — Put or Call
Structure: Sell a near-OTM option, buy a further-OTM option on the same side, same expiration. Two legs.
Use when: You have a mild directional lean and want fewer legs and simpler management than a full condor.
3. Iron Butterfly — Pin-Risk Income Play
Structure: Sell an at-the-money call and put (short straddle), buy an out-of-the-money call and put as wings. Four legs.
Use when: You expect the index to settle close to its current level — a low-realized-volatility grind into the close.
4. Broken Wing Butterfly — Directional with a Built-In Cushion
Structure: An asymmetric butterfly — one wing wider than the other, frequently structured for a small credit or near-zero net debit. Three legs.
Use when: You have a directional lean and want the risk concentrated and defined on one side only.
5. Long Straddle / Strangle — Catalyst-Day Volatility Play
Structure: Buy an at-the-money call and put (straddle), or an out-of-the-money call and put (strangle), same expiration. Two legs.
Use when: A scheduled catalyst — CPI, FOMC, a major data release — is expected to produce a large move and you don't have a directional view.
Side-by-Side Comparison
| Strategy | Legs | Market View | Risk Defined? | Best For |
|---|---|---|---|---|
| Iron Condor | 4 | Neutral / range | Yes | Range-bound sessions |
| Credit Spread | 2 | Mild directional | Yes | Simpler directional plays |
| Iron Butterfly | 4 | Neutral / pin | Yes | Low-vol grind days |
| Broken Wing Butterfly | 3 | Directional, cushioned | Yes | Higher-conviction directional |
| Long Straddle/Strangle | 2 | Volatility, either direction | Yes (premium = max loss) | Catalyst/event days |
SPX 0DTE Volume: The Growth in Context
Bottom Line
All five strategies above are defined-risk by design. That's deliberate — 0DTE gamma moves fast enough that an undefined-risk short leg isn't worth the tail exposure on an expiration-day chain, PDT rule or not. The PDT repeal removes a frequency gate for small accounts; it doesn't reduce the capital required to run these positions or the speed at which 0DTE risk can move against you.
