CASH VS MARGIN — AND THE ONE-DAY SETTLE

Two kinds of accounts, one settlement clock: your money only (cash), or yours plus a loan (margin) — and every trade settles in one business day. A cash account is paying with the money in your wallet. A margin account is the shop letting you run a tab — except this shop re-prices your collateral daily, charges interest from the first day, and can call the whole tab due at the market's worst moment without asking. Settlement is the banking system's ‘the cheque cleared’: T+1 is how long a trade takes to become final money.

ACCOUNTS · STAGE 2 · LESSON 2

THE TAKEAWAYS

• Cash account: spend settled cash only. You cannot short, you pay no interest, and a loss can never exceed what you put in. Its one tripwire is trading on unsettled money — the good faith violation, taken apart in Lesson 5.
• Margin account: the broker lends against your holdings. Regulation T allows borrowing up to half the price of a stock purchase to open it (50% initial margin), and FINRA requires at least $2,000 of equity before margin borrowing works at all (Rule 4210).
• Settlement is T+1 for US stocks, ETFs and listed options (SEC Rule 15c6-1; the compliance date was May 28, 2024). Sell on Monday and the money is settled on Tuesday — weekends and holidays stretch the calendar wait, not the rule.
• IRAs: the IRS caps what you can contribute each year (the figure changes — check irs.gov for the current one). You cannot borrow against an IRA, and brokers limit IRA options to approved, usually defined-risk, strategies.

WORKED EXAMPLE — STEP BY STEP

1. Monday, mid-morning: you sell 10 SPY shares from a cash account. The trade executes instantly — a confirmation appears in seconds. But the money is not yet settled. Execution and settlement are two different events, and the gap between them is where cash-account trouble lives.
2. Tuesday (T+1): the sale settles. The cash is final — yours to withdraw, or to spend with no strings attached. Before May 28, 2024 this step landed on Wednesday: the standard cycle was T+2 until the SEC shortened it.
3. Now the gap-day trap: on Monday afternoon you buy something else with Monday's unsettled proceeds. That's allowed — brokers will let you. What is not allowed is selling that new purchase before the original sale settles on Tuesday. Do that and you've committed a good faith violation (Lesson 5 runs the full rules).
4. Same sale, margin account: the proceeds are spendable immediately, because the broker is effectively lending against the account while settlement happens behind the curtain. Simpler — and every balance in the account now lives under Lesson 3's loan rules.
5. The habit to take away: in a cash account, treat the balance your broker labels settled cash (or ‘available to withdraw’) as the only real money. Everything else is in transit until its T+1 day arrives.

WHY SETTLEMENT EXISTS AT ALL

Between execution and settlement, a trade is a promise, not a fact. The clearing system — in the US, the DTCC's clearing agencies stand in the middle — checks that the shares and the money actually exist and swaps them, so a stranger's failure can't unwind your trade. Shortening the promise window from two days to one is what T+1 did; announcing it, the SEC's chair said the change would make the market plumbing ‘more resilient, timely and orderly’. For you the visible effect is simple: money from a sale is truly, finally yours one business day after the trade.

COMMON BEGINNER MISTAKES

• Spending unsettled sale proceeds in a cash account, then selling again before settlement — the good faith violation (Lesson 5).
• Reading buying power as your money. In a margin account, most of it is the broker's loan limit.
• Assuming a sale's money can be withdrawn the same day. It settles T+1 — plan withdrawals around the clock.
• Drifting into a margin account because the app defaulted to it, without reading Lesson 3 first.

CHECK YOURSELF

DO IT — FIND YOUR SETTLED CASH

In your own broker app (or a paper account), find three balances: total account value, settled cash (often labelled ‘available to withdraw’), and buying power. Write all three in your journal with today's date. If buying power is bigger than settled cash, the account is a margin account — and Lesson 3 is now required reading before any trade.