Day Trading Options: The 2026 Rules, the Greeks Near Expiration and the Risks

Day trading options means opening and closing an option position within the same trading day, to profit from a move in the underlying or in the option's price before the close. It runs on the same contracts as any other options trade, but on the shortest horizon, where the greeks are at their most extreme: an option close to expiration can double or lose most of its value in hours. The rules that apply depend on the account: a cash account, or a margin account under the intraday margin standards that FINRA adopted in 2026.

The rules in 2026: the pattern day trader rule is being replaced

For years, day trading on margin was governed by the pattern day trader rule. In the SEC's investor glossary, FINRA rules define a pattern day trader as a customer "who executes four or more 'day trades' within five business days," provided they represent "more than six percent of the customer's total trades in the margin account" over those five days, and such customers "must have at least $25,000 in their accounts" (SEC, investor.gov).

FINRA Regulatory Notice 26-10, dated April 20, 2026, replaces those requirements "in their entirety," including "the day trade count requirements for designating a customer as a 'pattern day trader' and the $25,000 pattern day trader minimum equity requirement," with intraday margin standards that require equity "commensurate with the amount of market exposure" held at any time during the day. The amendments took effect on June 4, 2026, and firms that need more time may phase them in "until October 20, 2027" (FINRA Regulatory Notice 26-10). The SEC's glossary adds that your firm "might continue operating under the old day trading margin requirements during the transition," so ask yours which regime applies to your account.

The account rows quote FINRA's investor page on frequent intraday trading (FINRA, frequent intraday trading). Whatever the account, FINRA notes that "options trading requires specific approval from your brokerage firm" (FINRA, 0DTE options).

Why short-dated options move so fast

Short-dated options are the extreme case, down to options traded on the day they expire (0DTE). FINRA notes that options "may have quarterly, monthly, weekly or even daily expirations," and describes a 0DTE strategy as one that "establishes a position on the option contract's expiration day, though these option contracts may have been listed days, weeks or months prior." Cboe explains that by 2022 it had listed SPX Weeklys "with an expiration for each day of the week (Monday through Friday)," and that in 2023 SPX 0DTE options represented "roughly 43% of average daily volume" in SPX options (Cboe, August 2023).

Near expiration, two greeks dominate. Gamma is, in the OIC's words, "the sensitivity of Delta to a one-unit change in the underlying"; in the model below it is almost three times larger for an at-the-money call with one day left than with seven, so the option's sensitivity to the stock changes quickly. Theta, the time decay, "tends to be gradual at first and accelerates as expiration approaches," and "at-the-money options will have the most exposure to time decay" (OIC, theta). The chart under the introduction draws both for a hypothetical 100-strike call at 7, 3 and 1 days.

Inside that last day, the decay is not spread evenly. With the stock still at 100, the same model gives the 1-day call about 0.30 with 12 hours left, 0.21 with 6, 0.15 with 3 and 0.09 with 1: the first half of the day takes about 0.13 of its value, the last six hours the remaining 0.21. The model counts calendar hours, not trading hours, so read the shape, not the clock.

For a day trader the consequence is double. A move of 1 or 2 points in the stock can multiply the price of a cheap short-dated option: in the same model, with one day left, the 100 call is worth about 1.11 with the stock at 101, 2.6 times its 0.42, and about 2.02 at 102. The same option can lose most of its value if the move does not come before the close, and at 99 it is worth about 0.10. The guide to time decay shows the full decay curve, and the option greeks cheat sheet covers each greek.

What FINRA's 0DTE examples show

FINRA gives two examples (FINRA). In the first, with a stock at $54, you "sell 10 0DTE calls at a $55 strike price for $1," collecting $1,000. If the stock closes at $54 you keep it, but if it closes at $60 "you'd lose $4,000": the $5,000 difference between exercise value and market value, less the premium. In the second, you buy 10 0DTE calls with a $55 strike for $2 with the stock at $49; if it closes at $54, "you'd therefore lose the $2,000 premium."

FINRA adds a risk specific to the day of expiration: for physically settled options, "your firm may liquidate the position prior to the close of the regular trading session if you don't have the required funds or shares" to meet the obligation, at a price "that might limit potential profits or even lead to potential losses." It also warns that uncovered call writers face "unlimited potential loss if the market for the underlying security rises sharply."

Defining the risk: a one-day call spread

A long call loses at most its premium; a short call has no limit. Between the two, a debit spread caps both. With the same hypothetical inputs, buying the 1-day 100 call for 0.42 and selling the 1-day 102 call for 0.01 costs a net 0.41. At expiration the most it can lose is 0.41, the most it can earn is 2 minus 0.41 = 1.59, and it breaks even at 100.41. The short leg here brings in very little because the 102 call is far from the money for one day: the spread mostly caps the gain without reducing the cost.

Is day trading options worth it?

We cannot answer with a figure: this site has no options price data and has not tested any intraday options strategy, so it publishes no win rate or average return. FINRA's view of frequent intraday trading in general is cautious: "attempting to capture profits in the short term is generally less reliable than investing long-term," and frequent trading "can also come with higher costs that might erode your returns, as well as potential tax implications" (FINRA). Each round trip crosses the bid-ask spread on the way in and on the way out, plus any commissions: on a hypothetical option worth 0.42, a spread of 0.05 is about 12% of the price.

• Size on the premium. Assume a long short-dated option can go to zero before the close.
• Avoid uncovered short calls unless your account is approved for them and you can meet the obligation: FINRA's first example loses four times the premium collected on a 6 point move.
• Know your account's rules: cash settlement violations in a cash account, intraday margin in a margin account, and whether your firm still applies the pattern day trader rule during the transition.
• Watch the close: FINRA notes that the loss from a liquidation by your firm "might be heightened when a 0DTE opening trade is made closer in time" to its liquidation decision.

For trading short-dated options around a news event, see IV crush. More guides are in the options section.