Cash vs. Margin Accounts: Understand the Essentials for Investing

Search Fintrev

Search our guides, reviews and glossary.

A cash account lets you buy securities only with money you have deposited and that has settled. A margin account lets you borrow from your broker against the securities and cash in the account, which adds buying power and allows short selling and more advanced options trades. The trade-off is risk: in a cash account, the most you can lose is what you put in. In a margin account, losses grow with the borrowed money, you pay interest on the loan, and the broker can sell your holdings if your equity falls too low. For long-term, buy-and-hold investing, a cash account usually does the job. A margin account is mainly for traders who need leverage, short positions, faster reuse of sale proceeds, or multi-leg options strategies, and who are prepared to manage the debt.

How a cash account works

A cash account is the simplest brokerage account. You fund it by bank transfer, check or wire, and that money becomes available to buy stocks, bonds, ETFs, mutual funds and, at many brokers, some basic options positions. Purchasing power equals the settled cash in the account. With $5,000 deposited, you can buy up to $5,000 of securities and no more.

Settlement is the main constraint. When you sell a security, the trade settles one business day after the trade date (T+1) for most U.S. stocks and ETFs. Until then the proceeds are unsettled. Many brokers let you place a new purchase with unsettled proceeds, but the cash account rules then restrict what you can do with that new position:

• Good faith violation: you buy a security with unsettled funds and then sell it before those funds have settled. Brokers typically track these, and repeated violations can lead to restrictions.
• Freeriding: you buy a security and pay for it by selling the same security, without ever having had settled funds to cover the purchase. Under Regulation T, a freeriding violation generally results in a 90-day freeze, during which you must have fully settled cash before placing any purchase.

So if you sell a position in the morning, you cannot rotate that money through several trades before settlement without risking a violation.

Benefits of a cash account

• Losses are capped at your investment. No loan exists, so a falling market cannot leave you owing the broker money.
• No forced selling from leverage. You can hold a position through a drawdown for as long as you like. No maintenance requirement can trigger a liquidation.
• No interest charges. You never carry a debit balance, so nothing accrues against you. Uninvested cash can often sit in a sweep or money market fund and earn interest.
• Simpler recordkeeping. Your shares are fully paid and generally stay in your name rather than being available for the broker to lend.
• Lower barriers to open. No margin agreement or minimum equity is needed to trade.

Drawbacks of a cash account

• Fewer strategies. You cannot sell short, and options access is usually limited to buying calls and puts, writing covered calls and, at some brokers, cash-secured puts. Spreads and uncovered option writing require margin.
• Settlement delays. Proceeds are not freely reusable until they settle, which slows frequent trading.
• Returns are limited by your balance. You can only invest what you have, which also limits how much you can lose.

How a margin account works

A margin account combines a brokerage account with a revolving loan. The securities and cash in the account serve as collateral. You can use that credit to buy more securities, to sell short, or to withdraw cash as a short-term loan against the portfolio.

Three layers of rules set how much you can borrow and how much equity you must keep:

1. Minimum equity to borrow. FINRA rules require at least $2,000 in equity (or the full purchase price, if less) before you can trade on margin. Many brokers require more before they approve margin.
2. Initial margin. Regulation T, set by the Federal Reserve, generally caps borrowing on a stock purchase at 50% of its price. With $10,000 of your own money, you can buy up to $20,000 of marginable stock. Some securities are not marginable at all, and brokers can set higher initial requirements for volatile or concentrated positions.
3. Maintenance margin. After the purchase, FINRA requires your equity to stay at 25% or more of the market value of the securities. Brokers often set a higher house requirement, sometimes much higher for specific stocks, and can raise it without advance notice.

Equity here means the market value of your securities minus what you owe the broker. When prices fall, the loan stays the same while the collateral shrinks, so your equity falls faster than the market value of the position.

Margin interest

Borrowed money accrues interest daily for as long as a debit balance exists, and it is usually charged monthly. Brokers set their rates as a benchmark (such as a base rate or the federal funds rate) plus a spread, and the rate typically falls as the size of the loan rises. Rates differ widely between firms, so the cost of carrying the same loan can vary a lot depending on where you hold the account. Interest also changes the math of holding: a leveraged position has to gain at least the interest cost before the extra shares earn you anything. That is why margin tends to suit shorter holding periods better than a years-long hold.

What margin unlocks

• Short selling. You borrow shares, sell them, and buy them back later, hoping the price has fallen. Short sales are only allowed in margin accounts. Regulation T requires the short sale proceeds plus 50% of the position’s value as initial margin.
• Advanced options strategies. Spreads, uncovered (naked) writing and other multi-leg positions need a margin account plus the right options approval level. Covered and fully cash-backed strategies can often run in a cash account.
• Faster use of sale proceeds. Because the broker extends credit, you can generally reuse proceeds immediately without the good faith and freeriding problems of a cash account.
• Borrowing against the portfolio. You can withdraw cash against your holdings without selling them. This avoids realizing a capital gain, but the withdrawal is a loan secured by securities that can lose value.

Worked example: the same $25,000 in each account

The following hypothetical example uses round numbers to show the mechanics. Assumptions: you have $25,000, XYZ stock trades at $100, the margin trade borrows the full Regulation T amount, and interest, commissions and taxes are ignored.

Cash account: you buy 250 shares for $25,000.

Margin account: you buy 250 shares with your own money and borrow $25,000 for another 250, for 500 shares worth $50,000. Your equity is $25,000 and your loan is $25,000.

If XYZ rises to $150:

• Cash account: 250 shares are worth $37,500, a $12,500 gain (50% on your money).
• Margin account: 500 shares are worth $75,000. After repaying the $25,000 loan, you have $50,000, a $25,000 gain (100% on your money), less the interest you paid while holding.

If XYZ falls to $50:

• Cash account: 250 shares are worth $12,500. You are down $12,500 on paper and can choose to keep holding.
• Margin account: 500 shares are worth $25,000, which exactly equals the loan. Your equity is zero, and your whole $25,000 is gone.

In practice, the margin account would not reach $50 untouched. A margin call arrives much earlier. You can find the price that triggers it with this formula:

Margin call price = loan ÷ (shares × (1 − maintenance requirement))

At FINRA’s 25% minimum: $25,000 ÷ (500 × 0.75) = $66.67. At a 30% house requirement: $25,000 ÷ (500 × 0.70) = $71.43. So a decline of roughly 29% to 33% in the stock, in this setup, forces you to deposit money or sell shares. The cash account holder is under no such pressure at the same price.

A margin call means the broker demands that you bring equity back up to the maintenance level, either by depositing cash or marginable securities or by selling holdings. The terms of your margin agreement matter more than the word “call” suggests. Brokers are generally not required to contact you first or give you time to act. They can sell any of your positions, in any order, at prevailing prices, to cover the shortfall. If the stock later recovers, the shares you were forced to sell do not come back.

Gaps make this worse. If a stock opens sharply lower after earnings or news, the account can go straight past zero equity. The shortfall becomes a debit you owe the broker, which is how margin users lose more than they deposited. Short positions carry a version of this risk with no ceiling: a stock’s price can keep rising, so the loss on a short sale is theoretically unlimited.

Exceptions that change the answer

The general rule (cash for holding, margin for active or leveraged trading) shifts in several specific situations.

Pattern day trading

Under FINRA rules, a customer who makes four or more day trades within five business days in a margin account, where those day trades are more than 6% of total trades in that period, is flagged as a pattern day trader. The account must then keep at least $25,000 in equity on any day you day trade. Below that level, day trading is restricted until equity is restored.

The pattern day trader rule applies to margin accounts. A cash account is not subject to the $25,000 threshold, but every round trip has to use settled funds. That makes a cash account one way for a smaller account to day trade a few times a week, within the limits of its settled cash.

Retirement accounts

You cannot borrow on margin inside an IRA. Pledging IRA assets as collateral for a loan can be treated as a distribution under tax rules, and retirement accounts are designed for long-term saving. Some brokers offer a “limited margin” feature for IRAs that lets you use unsettled proceeds and trade certain options spreads without any borrowing. Short selling and margin loans remain off the table. If your goal is tax-advantaged retirement investing, the cash-versus-margin choice is effectively made for you.

Margin enabled but never used

A margin account with no debit balance costs no interest and carries no leverage. Some investors choose margin only to avoid settlement violations or to keep the option of a short-term loan for emergencies. The catch is behavioral and contractual: the credit is always available, an options assignment or an order larger than your cash can create a debit, and you have signed an agreement that lets the broker liquidate positions if a debit ever arises. Some brokers also default to using margin when an order exceeds available cash, so check how your account handles it.

Portfolio margin

Some brokers offer a third account type, portfolio margin, which sets requirements from the modeled risk of the whole portfolio rather than fixed percentages per position. A hedged portfolio, such as stock combined with protective puts, can need far less margin, while a concentrated or unhedged one can need more. FINRA rules require at least $100,000 in equity, requirements can change daily, and leverage can be much higher than under Regulation T. It is a tool for experienced options and hedging traders.

Other consequences of a margin account

Leverage is the obvious risk. A few less visible terms also come with the margin agreement:

• Securities lending and hypothecation. When you carry a debit balance, the broker can pledge or lend the shares that secure your loan, typically to short sellers such as hedge funds or to firms that need shares for derivatives or settlement. You are not paid for this by default. Some brokers run separate fully paid lending programs that share revenue, but those come with their own conditions.
• Payments in lieu of dividends. If your shares are on loan when a dividend is paid, you receive a substitute payment from the borrower rather than the dividend itself. Under IRS rules these payments are generally taxed as ordinary income rather than at qualified dividend rates.
• Voting rights. Shares on loan cannot be voted by you.

Which account is better for you

Neither account type is better in general. The right one depends on what you need the account to do.

Choose a cash account if:

• You buy and hold stocks, ETFs or funds and rarely trade more than a few times a month.
• You want your maximum loss capped at what you deposited.
• You would not be able to add money quickly if prices fell sharply.
• Your options activity is limited to buying options or writing covered calls.
• You are still learning. Practicing first in a stock market simulator shows how leverage changes outcomes without real money at risk.

Choose a margin account if:

• You need to sell short or trade spreads and other margin-dependent options strategies.
• You trade often enough that settlement delays get in the way, and you meet the $25,000 requirement if you will be a pattern day trader.
• You understand how the margin call price is calculated, have a plan for a call, and can afford the interest.
• You want access to a portfolio-backed line of credit and accept that the broker can sell collateral without warning.

A middle path is to open a margin account and keep it free of debt, using it only for settlement flexibility or hedges. That brings the contractual risks described above, but no interest or leveraged exposure unless you choose to borrow.

FAQs

The Bottom Line

For buy-and-hold investors and anyone who could not add money quickly in a sharp decline, a cash account caps losses at the deposit and avoids interest and forced sales. A margin account fits traders who need short selling, spreads or faster reuse of proceeds and who can calculate their margin call price and afford the interest. Keeping a margin account free of debt adds flexibility without leverage but still carries the agreement's liquidation terms.