What happens after short put assignment?

Assignment fulfills the put writer's obligation to buy the underlying. One unadjusted equity put generally purchases 100 shares at the strike. The option disappears for the assigned quantity rather than remaining open alongside the shares. Any unassigned contracts remain short and can create additional purchases later.

A 50-strike put assigned on 100 shares creates a 5,000 gross stock purchase before fees. The current stock price does not replace the strike in that ledger entry. If the stock is at 42, the account still buys at 50 and immediately holds shares worth about 4,200, producing an 800 stock shortfall before premium and costs.

The opening premium stays in the transaction history. If the 50-strike put was sold for 2 per share, the simplified economic break-even is 48 before fees. That does not mean the broker pays only 48 at assignment: the stock purchase occurs at 50, while the earlier 2 credit is reconciled separately.

Under general U.S. federal rules, premium on an exercised written put usually reduces the basis of shares acquired. Preserve the strike purchase, premium, fees, multiplier, assignment date, and tax lot rather than recording only a net price. Wash-sale, straddle, cross-account, and jurisdiction-specific rules can modify the tax result.

OCC states that standard equity-option exercise delivery occurs on T+1. A cash-secured put may use reserved cash, while a margin or uncovered put can create a debit, reduced buying power, interest, or a margin deficiency. The label cash secured does not prove that all required dollars are settled and available.

The broker may display the option removal, shares, assignment debit, pending settlement, and buying-power change at different times. Do not assume a delay cancels the obligation. If the account cannot fund the purchase, the firm may liquidate shares or other assets under its agreement, potentially at an unfavorable price.

Once assigned, the account owns stock whose value can continue falling toward zero. Selling those shares is a new market transaction, not a reversal of assignment. Holding, selling, hedging, or writing calls each creates a new risk and tax decision that should be evaluated from the actual posted share quantity and basis.

Partial assignment can buy shares for only some contracts while leaving other short puts open. Adjusted contracts can deliver a quantity other than 100 shares or include cash. Record the full symbol, multiplier, assigned contracts, deliverable, strike debit, premium, fees, shares, cash, buying power, settlement, and remaining options.