Educational only, not tax, legal, or financial advice. Rules vary by broker and situation — verify specifics with your broker or a professional.

Settlement is when a trade officially completes and ownership/cash transfers. US stocks now settle T+1 — trade date plus one business day. Options generally settle T+1 as well. It matters most for cash accounts.

What T+1 means

When you trade, the execution is instant but the official transfer of cash and securities happens the next business day (T+1, recently shortened from T+2). For most margin-account trading it’s invisible — the broker fronts the settlement. But in a cash account, you must wait for funds to settle before reusing them, which constrains how often you can trade (a settlement limit distinct from the PDT rule).

Why it matters

In a cash account, using unsettled funds to trade can trigger a “good-faith violation.” So T+1 affects how quickly you can recycle capital if you don’t use margin. In a margin account, day trading is governed by the PDT rule instead. Knowing which regime you’re in tells you your real trading frequency limit.

T+1 is the settlement clock: trades execute now, but the cash truly frees up one business day later — a real constraint if you trade in a cash account.

What it means for a scalper

Margin-account scalpers mostly ignore T+1 (the PDT rule is the binding constraint under $25k). Cash-account traders must respect settlement to avoid violations. Either way, know your account type’s rules — they shape how often you can actually trade.