The Rolling Put Diagonal: Weekly Income Against a Long Put

Renting out the week against a longer lease

A put diagonal is two puts pulling in opposite directions on purpose. You buy a longer-dated put — one to two months out — and you sell a weekly put against it, near the current price. Every Friday, the weekly is rolled or closed and a fresh one is sold. The long put is your protection and your anchor; the weekly sales are the income.

The edge lives in the term structure: short-dated options decay faster than longer-dated ones. The weekly you sell melts quickly; the back-month put you own melts slowly. In a flat to gently soft market, you harvest that difference week after week — the diagonal earns where plain short puts sit idle, because its short strike sits right at the money instead of far below it.

A three-week campaign, in numbers

Follow one campaign, week by week. /MES at 6,500. Buy the 45-day 6,300 put for $180. Sell the Friday-expiring 6,480 put for $80. Net outlay: $100. Starting risk is the width between the strikes (180 points at $5 a point = $900) plus that $100 debit — $1,000, set on day one and never moved. Profits below count only weeklies that are closed; a freshly sold weekly is an open obligation, not income yet.

• Week 1 — /MES 6,525, slightly up. Friday, early afternoon: the 6,480 weekly is bought back for pennies (counted as $0). Banked: $80. The short strike follows the market up — sell the next Friday 6,495 put for $75. The anchor is marked at $165 — a little decay, a little further out of the money. Campaign P&L: $165 + $80 − $180 = +$65.
• Week 2 — /MES 6,520, flat. The 6,495 weekly is bought back for pennies. Same strikes roll forward — sell the next 6,495 put for $70. Banked: $155. Anchor marked at $155. Campaign P&L: $155 + $155 − $180 = +$130.
• Week 3 — /MES 6,470, down week. Friday, early afternoon: the 6,495 short is $25 in the money — about $125 of intrinsic value. Per the Friday rule it doesn't get held hoping; close it for $130, a $60 give-back on the $70 collected. Roll down and sell the next Friday 6,430 put for $55 — the fresh weekly still pays real premium, so the campaign continues. Banked: $80 + $75 + $70 − $130 = $95. The anchor, closer to the money with volatility up, is marked at $245 — the cushion doing its job. Campaign P&L: $245 + $95 − $180 = +$160.

Three weeks, one down week, and the campaign is up $160 on $1,000 of starting risk — short of the +$500 target, comfortably clear of the stop. That is the diagonal working as designed: flat weeks pay, down weeks get cushioned, and the Friday clock never lets a weekly die of old age.

The Friday roll clock

This strategy runs on a calendar, not on feelings. Every Friday the expiring short is handled by early afternoon — rolled to the next weekly or closed. No short is ever held into the expiry-day close hoping for the last dollar; the assignment and pin risk of expiry Friday isn't worth it.

The roll follows the market: if the market rose on the week, the short strike moves up with it; if it went nowhere, the same strikes roll forward; if it fell, the short moves down — but only if the fresh weekly still pays real premium. A down-week roll whose new weekly pays next to nothing is the market telling you the campaign is over, and the honest move is to close it.

What it is not

A diagonal is not a crash hedge. It carries a mild long bias — it loses in sustained downtrends, just more slowly than a naked short put, because the long back-month put cushions the first part of the fall. In a real crash it correlates with every other short-put position you own. Its diversification is across chop: it earns in the flat, grinding tapes where far-out-of-the-money short puts collect dust.

It is also not passive. This is a campaign, not a trade — weekly attention, weekly rolls, a trend-exit rule if the market breaks down and stays down, and a hard stop at half the campaign's starting risk. Miss a Friday and the structure starts working against you.

Campaign accounting

Think of each diagonal as a campaign with a fixed starting risk: the width between the strikes plus the net debit paid to open it. That number is set on day one and never moves — the targets are set against that starting number, not against whatever the position happens to be worth today: up fifty percent of starting risk, close and celebrate; down fifty percent, close and walk away. Five good weeks don't change the stop. Three bad rolls don't move the target.

One more discipline: the weekly sale has to justify the anchor. The weeklies should pay for a good part of the long put's cost — if they stop doing that, the structure isn't funding its own protection anymore, and the stop gets tightened. A diagonal that can't fund its insurance is just an expensive lottery ticket.

More than a strategy: a rule engine. We don't just describe strategies — every strategy on this site runs on our proprietary internal rule engine, built in-house. It determines the trade ideas and the trade management mechanics for the rolling put diagonal: what qualifies as an idea, when to enter, when to harvest a winner or cut a loser, and when to sit out entirely. We publish what it governs, never the exact lines it draws — those stay in-house. Every idea you see here follows the same proprietary rules, every time.

Diagonal vs calendar spread

The names get mixed up, so here is the clean split. A calendar spread uses the same strike across two expiries — it is a volatility and time-decay trade, usually centered at the money. A diagonal uses different strikes too: here, the long put sits below the market, the short put sits near it. That one difference changes the job description. The calendar bets on how price and volatility move around a strike; the diagonal is an income campaign where the short strike's only job is to collect rent every week.

If you are screening for diagonal candidates, screen for what the short weekly pays against the anchor's cost — the weeklies are the business, the anchor is the insurance. A diagonal whose weeklies can't fund their own protection is a calendar wearing a costume.

The honest risks

The trend is the enemy. Two flavors: a slow bleed downward, where each weekly roll brings less credit and the long put's cushion erodes — death by a thousand Fridays; or a sharp selloff, where the short weekly goes deep in the money and the campaign hits its stop in days. The trend-exit rule exists because hope is not a roll strategy.

Volatility crush cuts the other way: if implied volatility collapses, the weekly premiums you sell shrink, and the income engine sputters. The diagonal wants a market with enough nervousness to pay for weeklies but not so much that it trends — a narrower window than it first appears.

Two more mechanics worth knowing. The weekly short is held over the weekend — futures trade nearly around the clock, but a Sunday-night gap down still opens against you. And if a short weekly goes deep in the money, assignment turns it into a long /MES futures position. That is what the Friday rule is for: nothing is ever held into the expiry-day close hoping for the last dollar.

The bottom line

A rolling put diagonal is a weekly income campaign built on a simple observation: near-term options decay faster than longer-term ones. Buy the anchor, rent out the weeks, follow the Friday clock, and judge every campaign against the risk you started with. It won't save you in a crash — but in the flat tapes where most income strategies starve, it's the one still getting paid.