Rolling a put: when and what it costs

What rolling is

Rolling a put means buying back the put you sold and selling a new one, usually further out in time and often at a lower strike, in one order. Traders roll to avoid assignment, to collect more premium, or to give a losing trade more time.

A roll is two trades: a close and a new open. The close locks in whatever the first put has lost, and the new put is a fresh bet that has to earn on its own.

What it costs

When a put is threatened, buying it back is expensive. In our records a defensive buyback cost roughly three times the premium originally collected. Rolling for a net credit sounds like it avoids that cost, but the credit usually comes from selling more time or a closer strike, which means more risk on the new position.

Each leg also pays the bid-ask spread and fees. Rolling repeatedly can turn a single loss into a string of positions that all carry the same exposure.

When defending helps

In our paper book the defensive close was right when it fired: on the trades where it acted, the buyback lost much less than holding to expiry would have. On cash-secured puts, closing early on a profit target also did much of the tail management, since most puts that would eventually have been assigned were closed at half their premium first.

Spreads are different. A study of put credit spreads found that holding to expiry beat every early exit tested, and that a time exit at 21 DTE was clearly worse, because it buys back the spread while most of its time value is still in it. Stop-loss rules on spreads failed for the same reason: losses arrived as gaps the daily mark could not dodge.

A plain test before rolling

Ask whether you would open the new position fresh, at that size, today. If not, the roll is a way of not taking a loss rather than a trade. Rolling also does nothing for concentration: a rolled put on the same ticker is still the same bet. The assignment guide covers the alternative of taking the shares.