Picking the right expiration date

← Strike selection is where you choose the price you're willing to buy or sell at. Days to expiration (DTE) is the second dial: the calendar you give the trade to work out, the calendar the market gives you to roll it, and the calendar that determines how much theta bleed you actually collect per day the position is open.

Premium scales with DTE. Roughly, a 35-DTE option carries 3–4× the premium of a 7-DTE option at the same strike and same delta. Most of that extra premium is just time value — it bleeds back to zero as the trade approaches expiration, and that bleed is the whole point of the Wheel. A $1.85 premium over 35 days is roughly $0.053/day before the curve steepens — and almost nothing per day in the final week. The right DTE is the one that gives you enough bleed at a flat daily pace, with enough calendar left to roll if the trade goes against you.

Theta is the per-day premium the option pays you for holding it short. It is not linear in DTE — and once you have that curve in your head, every Wheel trade gets easier. Week 1 (high DTE) is flat: theta is small in absolute terms because so much of the premium is still time value the trader above you wouldn't mind paying. From week 2 onward the curve climbs. In the final 5–10 DTE, the curve is at its steepest — and at that point gamma, the price sensitivity per dollar of underlying move, is rising in lockstep.

The maths is unforgiving: a 14-DTE short put at −0.30 can become a −0.50 delta in a single overnight gap. You stop being a premium seller at that point — you become a stock surrogate with a built-in deadline. The sweet window that lets theta work in your favour without inviting gamma is 21–45 DTE. Open inside that band, manage (roll or close) before you cross 21 DTE, and never ride a short option into the final two weeks.

Rule of thumb. Open with 30–45 DTE, close or roll when you cross 21 DTE, and never let a short option ride into the final two weeks of its life. Everything else about Wheel timing is a refinement of this single band.

Concretely, exit at 21 DTE means: if you opened a 35-DTE trade two weeks ago, you're now in week three. Your delta has crept from −0.30 to −0.35 / −0.40, gamma is starting to dominate theta, and one more 1–2% adverse move puts you inside the strike. That's the moment to either roll the trade → for a credit (if you can) or close it cleanly.

Two flavours, same mechanics. A weekly CSP opens with 7 DTE, pays a small premium, expires almost immediately, and frees up cash the same week. A monthly CSP opens with 30–45 DTE, pays a richer premium per contract, and ties the cash up for a full month — sometimes longer if you have to roll. Pick by the same yardstick: capital turnover vs yield per contract.

• Weeklies buy you more cycles per quarter. Twelve weekly CSP rollovers return roughly the same capital efficiency as three monthlies, and the gamma window is so short that small adverse moves are absorbed by the calendar. The trade-off is thinner individual premium and frequent churn — every Friday is a decision point.
• Monthlies buy you a larger premium and a longer adjustment window. A 35-DTE trade gives you four or five weekly candles to respond to a drift before gamma dominates. The trade-off is capital: that $22,000 is parked for the full month — yield per contract is higher, yield per day-of-capital is lower.

This is the lever the screener pulls behind the scenes — for every ticker it ranks on IV rank and delta window, it also surfaces the weekly and monthly CSP quotes side-by-side so you can choose cadence without re-quoting the chain by hand.