Why Weeklies Seem Better (And Sometimes Are)
Theta decay accelerates as expiration approaches. A 7-day option loses roughly 3-4% of its value per day in the final week, compared to 1-2% per day for a 30-day option. This means weekly sellers capture time decay more efficiently on a per-day basis.
Here's a comparison for SPY puts at 16 delta:
| Expiration | Premium | Daily Theta | Premium per Day | Annualized Yield |
On paper, weeklies win. You earn 14.2% annualized versus 6.6% for 45-day puts. But these numbers assume you can sell at 16 delta every single week, commissions are zero, and the market cooperates. Reality is messier.
The Hidden Costs of Weekly Selling
Transaction costs add up fast. If you're selling 52 puts per year instead of 12, even $0.65 per contract adds up. On a $5,000 annual premium target, that's $34 versus $8 in commissions. Not a dealbreaker, but it compounds.
Bid-ask spreads are wider on weeklies. A 30-day SPY put might have a $0.03 spread. A 7-day put at the same delta often shows $0.05-$0.08. Over 52 trades, that slippage costs you $260-$416 per contract annually.
Gamma risk is higher. With 7 days to expiration, a 2% stock move can push your out-of-the-money put deep in the money. A 30-day put absorbs the same move with less delta change. Weekly sellers face more binary outcomes.
You can't look away. Monthly puts give you 3-4 weeks where the position mostly takes care of itself. Weekly puts demand attention Monday through Friday. Miss a Thursday selloff and you might wake up to an assignment on Friday.
The Optimal Weekly Strategy
If you're committed to weeklies, here's how to make them work:
Sell on Monday or Tuesday, not Friday. Selling the following week's options at the end of the current week means you're selling with 7 days of theta. Selling Monday or Tuesday for the same Friday expiration means 4-5 days of theta but at a lower delta for the same strike. You capture the steepest part of the decay curve.
Use slightly wider strikes. Since gamma is higher, go to 12-15 delta on weeklies instead of 16-20 delta on monthlies. You give up some premium per trade but dramatically reduce assignment risk.
Close at 50% profit. This is even more important with weeklies. If you sell a put on Monday for $1.80 and it's worth $0.90 by Wednesday, close it. Don't hold to Friday trying to squeeze out the last $0.90 — that's when gamma risk is highest.
A Hybrid Approach That Works
Many experienced sellers use a combination:
This balances the higher theta of weeklies with the stability of monthlies. If you miss a week due to travel or life, your monthly positions carry you.
Weekly Puts on SPY: The Numbers
SPY is the most common weekly CSP target. Selling 16 delta puts every Monday and closing at 50% profit (or expiration):
That's competitive with monthly approaches and reflects the reality that weeklies don't magically double your returns.
Using OptionsPilot for Weekly Optimization
OptionsPilot's strike finder updates daily and highlights when weekly premium at your target delta is above its 30-day average. This helps you identify high-premium weeks — often around economic data releases, VIX spikes, or sector rotations — where selling weeklies offers an above-average edge.
Bottom Line
Weekly cash secured puts can boost income, but the improvement over monthlies is smaller than the math suggests once you account for transaction costs, wider spreads, and higher gamma risk. The hybrid approach — mostly monthlies with selective weeklies — offers the best balance of returns and manageability.