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30 DTE or 45 DTE: which expiry should a seller pick?

A 45-day option pays more up front and decays slowly at first. A 30-day option pays less but starts closer to the fast part of the decay curve. Many sellers pick 45 days and close around 21 days left. Here's why.

Options guide · 9-minute read · Updated 2026-10-27

The short answer

DTE means days to expiration. A 45 DTE option pays a bigger premium than a 30 DTE option at the same strike, but not 50% bigger. It also decays more slowly in its first weeks.

A common habit is to sell around 45 days out and close or roll with about 21 days left. That keeps the steadier middle of the decay curve and skips the last three weeks, when options swing hardest. Selling at 30 days and holding to expiry is simpler but spends more of the trade in that sharp zone.

Neither is a rule. Both are ways to choose which part of the decay curve you want to own.

The time-decay curve, in plain words

An option loses value as time passes, if nothing else changes. That melt is Theta. It isn't even: slow when there's lots of time left, faster near the end. See theta decay explained.

Here's one made-up put to show the shape (an illustration, not a trade idea). A stock, XYZ, sits at $50 the whole time. The put has a $45 strike.

Two things stand out:

1. The 30 DTE put is just the 45 DTE put, 15 days later. Selling at 45 days means you also collect those first, slower 15 days.
2. The last three weeks decay fastest. That's the part sellers want. It's also the part where a move in the stock hurts most.

Why the last weeks cut both ways

Near expiry, a put close to its strike changes value very fast when the stock moves. That speed is gamma. See gamma risk for option sellers.

So the last three weeks bring the fastest decay and the sharpest swings. A $3 drop with 40 days left nudges the put. The same drop with 5 days left can double or triple it.

The "manage at 21 days" habit is a way to collect a good share of the premium and step out before that sharpest stretch.

The same put, managed at 21 days (an illustration, not a trade idea)

You sell the 45 DTE $45 put for $1.40 and collect $140. With 21 days left, you check and close, whatever has happened. Here's what that looks like in four different months. Put values are made up but realistic in shape.

Holding isn't always worse. The stock can bounce. But closing at a set day turns an open-ended risk into a known result. If you'd be happy to own the shares at $45, accepting assignment is also a plan. See closing options before expiration.

30 DTE vs 45 DTE, side by side

There's no free lunch. The 21-day close pays the spread and a fee to buy back, and gives up part of the premium. In return, it skips the stretch where most sudden losses happen.

Pick this if, pick that if

30 DTE fits if:

• You want the simplest routine: sell, then let it expire or be assigned.
• You'd be glad to own the shares at the strike, so assignment is fine.
• Your stock has no earnings inside the 30 days.

45 DTE, managed at 21, fits if:

• You want a planned exit before the sharpest days.
• You're fine buying back and reopening each cycle.
• You'd rather keep part of the premium more often than all of it, with bigger surprises.

Either can work for the wheel strategy. What matters is picking one and logging it, so you can see over ten or twenty trades how it really behaves for you. For shorter expiries, see weekly vs monthly cash-secured puts. For strikes, see 20 delta vs 30 delta puts.

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