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A cash account uses only settled money you have deposited, while a margin account lets the broker lend against your securities. Margin can increase buying power, but it adds interest, collateral requirements, forced-sale risk and the possibility of owing more than you invested. Cash avoids that loan, yet settlement rules still limit when you can reuse sale proceeds. As of October 13, 2026, margin day-trading requirements are changing, so your firm’s agreement and current disclosures control the details.
Cash and margin accounts at a glance
| Decision point | Cash account | Margin account |
|---|---|---|
| How a purchase is funded | You pay the full purchase price with available cash; the broker does not lend for the trade. | The broker may lend against eligible securities held as collateral. |
| Borrowing cost | No margin-loan interest when you do not borrow. Other account or transaction charges depend on the firm. | Interest applies to borrowed balances. The rate, accrual method, billing date and treatment of cash balances vary by firm. |
| Downside exposure | A fully paid position can lose value, but there is no loan balance created by the purchase. | Leverage magnifies losses. You can owe the loan, interest and other charges even after securities are sold. |
| Broker action when requirements are missed | Payment violations can restrict the account, including a possible 90-day freeze for freeriding. | The firm can demand more collateral or sell securities, potentially without advance notice, and can set requirements above regulatory minimums. |
| Using sale proceeds again | You must track settled cash and payment deadlines. Most U.S. equity trades settle T+1. | Margin changes buying-power calculations, but borrowing and intraday requirements apply. The exact display and rules are firm-specific. |
| Active trading rules | Trading is constrained by payment and settlement rules; a same-day round trip can be allowed when the purchase was fully funded. | As of October 13, 2026, firms are moving from the former pattern-day-trader framework to new intraday margin requirements on different schedules. |
These are general U.S. investor distinctions, not individualized financial advice. An account labeled “margin” does not mean every order uses borrowed money; borrowing occurs when the firm finances a debit balance under the agreement.
How a cash account works
Full payment is the defining rule
In a cash account, your broker must receive payment for a purchase rather than extending a margin loan. The relevant cash is the amount the platform treats as available and settled, not necessarily every dollar shown in a total-balance field. The SEC describes account types and cash-account obligations in Types of Brokerage Accounts.
A sale creates proceeds, but those proceeds may remain unsettled until the settlement date. For most U.S. equity trades, FINRA says settlement is T+1: the next business day. Until then, a broker may show the money as buying power while separately identifying it as unsettled. Those labels are not interchangeable, so read the platform’s settled-cash and cash-available fields before entering another order.
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When a same-day trade can be permitted
Same-day buying and selling is not automatically forbidden in a cash account. The SEC’s instructional example starts with $10,000 in cash, uses it to buy $10,000 of ABC on Monday, and sells ABC that day. Because the purchase was paid with cash already in the account, the example treats the trades as permitted. Your broker’s controls can still reject an order if its own available-cash calculation differs.
What creates freeriding
Freeriding occurs when you buy a security using sale proceeds that have not settled, then sell the new security before the original sale settles without adding other cash to pay for the purchase. For example, the SEC’s cash-account bulletin describes selling settled ABC on Monday, using the unsettled proceeds to buy XYZ that day, and selling XYZ that afternoon. ABC does not settle until Tuesday, so the XYZ purchase was not paid for on time. The SEC says this practice is not permitted and can lead to a 90-day cash-account freeze; during the freeze, purchases must be fully paid on the trade date. The bulletin was updated August 7, 2026: Trading in Cash Accounts – Investor Bulletin.
How to plan around settlement
- Before submitting an order, open the broker’s balances page and identify settled cash, unsettled proceeds and any cash committed to open orders.
- Reserve enough settled money to pay for the entire purchase by the deadline, even if you expect to sell another holding.
- After selling, note the stated settlement date and do not treat the proceeds as settled until that date arrives.
- If the platform warns of a payment violation, stop trading with those proceeds and ask the firm whether a restriction has been applied.
Cash accounts therefore remove margin-loan risk, not investment risk. A stock can still fall sharply, and a settlement mistake can limit your ability to trade.
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The portfolio secures a loan
A margin account is a credit arrangement. The broker lends against securities that it accepts as collateral, and your equity is the market value of those securities minus the debit balance and other obligations. The margin agreement authorizes the firm to calculate requirements, charge interest and act when collateral becomes insufficient. The SEC explains the structure in its Investor Bulletin: Understanding Margin Accounts.
Borrowing is optional in the sense that a margin account can hold a positive cash balance, but the agreement still governs the account. A purchase that creates a debit balance incurs borrowing costs; a trade paid entirely from available cash may not. Ask the broker how it nets cash, handles withdrawals and identifies the amount actually borrowed.
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Leverage can create debt beyond your contribution
If securities bought with borrowed money decline, your equity falls faster than it would in a fully paid position. The broker can require additional funds or eligible collateral. If you cannot meet the requirement, the firm may sell securities to reduce the debit. Sale proceeds may be insufficient to repay the loan, leaving you responsible for the remaining balance and interest.
The SEC’s investor bulletin puts the risk in two questions: “Are you aware you may lose more than the amount of money you initially invested when buying on margin?” and “Are you aware that your brokerage firm can sell your securities without notice to you when you don’t have sufficient equity in your margin account?” The bulletin is staff investor education, not a rule, regulation or formal Commission statement; the binding obligations come from applicable regulations, the contract and the firm’s notices.
House requirements and forced sales
Regulatory requirements are a floor. A broker can impose a higher “house” maintenance percentage, restrict a security, reduce its lending value or raise requirements during volatile markets. The firm’s agreement can permit liquidation without waiting for your approval, and it may choose which positions to sell. Contact the firm immediately if you receive a collateral notice; transferring money after a sale may not restore the original positions.
Costs that differ between the accounts
Margin interest is the principal incremental cost
Cash accounts do not incur margin-loan interest when no borrowing is used. Margin-account rates are not standardized. Compare the quoted annual rate, whether it is variable, how often interest accrues, the billing date, minimum charges, and whether a positive cash balance is automatically swept or netted against the debit. Also check repayment terms, collateral substitutions and what happens if you withdraw cash while a debit remains.
The SEC’s interest bulletin uses a hypothetical $50,000 margin loan at 7% annual interest. That illustration produces $3,500 per year, or about $9.59 per day. It contrasts this with $50,000 of cash earning 1%, or $500 per year; without netting, the illustrative net cost is $3,000 annually, approximately $8.22 per day. These figures are examples, not a current rate quote or a prediction of what any broker will charge. A firm that nets an equal cash balance against the loan could eliminate interest on that loan in the example, while the swept cash would no longer earn the separate cash rate. Read Investor Bulletin: Interested in Margin? Understand Interest for the mechanics.
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How leverage changes a loss
Another SEC hypothetical starts with a $50 stock purchased on margin using a $25 investor contribution and borrowed funds for the remainder. If the stock falls to $15, the example says the investor loses more than the original $25 and still owes an additional $10 plus interest. It is an illustration of loan arithmetic, not a measured market outcome. The exact result in your account depends on the number of shares, loan amount, interest and liquidation price.
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Commissions, regulatory fees, wire charges, securities-borrow fees, options costs and account minimums are not established uniformly by the sources here. Do not assume that a margin account includes short selling, options or a particular minimum; permissions and prices are firm-specific. Request the current fee schedule and account agreement before relying on a quoted cost.
Cash-account trading limits in practice
Settlement, not a “day-trade count,” is the key constraint
Cash-account capacity depends on when money becomes settled and on how much of it is committed to pending purchases. A sequence of trades can be possible on one day and prohibited the next if the source of funds changes from settled cash to unsettled proceeds. FINRA’s explanation of frequent intraday trading and settlement is available at Frequent Intraday Trading: Understanding the Basics.
A simple cash-ledger method
- Record the settled cash balance at the start of the day.
- Subtract the full cost of each purchase that you intend to fund with cash.
- Add sale proceeds only on their stated settlement date, not when the sale executes.
- Keep a separate note for unsettled proceeds so you do not accidentally fund a new position with them.
- Save confirmation screens when a broker’s buying-power figure and settled-cash figure appear inconsistent, then ask support which number governs payment.
This method does not guarantee an order will be accepted, because brokers can apply additional controls, but it prevents the common mistake of treating an execution price as immediately settled money.
Margin day-trading rules are changing
The transition timeline
As of October 13, 2026, the SEC reports that FINRA’s new intraday margin requirements became effective June 4, 2026. Broker-dealers may transition until October 20, 2027. During that period, one firm may still apply the former pattern-day-trader framework while another has migrated to the new approach. Confirm the status shown in your account agreement or ask the broker before placing frequent trades. The SEC’s margin bulletin is at Investor Bulletin: Understanding Margin Accounts.
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What the new approach measures
FINRA describes the new model as monitoring account equity against actual intraday positions rather than labeling a customer solely by a count of day trades. A firm can require prompt correction of an intraday margin deficit; repeated failures can lead to restrictions. FINRA’s investor explanation is Understanding the New Intraday Margin Requirements.
Minimum equity is not a universal promise
FINRA’s guidance says $2,000 is the minimum equity required for leveraged trading under the described framework, while firms may set higher requirements. Do not treat $2,000 as a guarantee of buying power, a universal day-trading threshold or a promise that a particular broker has completed its transition. The firm can apply higher house requirements, intraday limits or security-specific restrictions.
Questions to ask your broker before frequent trading
- Has the firm adopted the new intraday requirements, or is it still using the former framework during the transition?
- What equity, collateral and buying-power figures are tested intraday, and how quickly must a deficit be corrected?
- Which house requirements exceed regulatory minimums, and can they change without advance notice?
- How are cash balances netted against a margin debit, and when is interest posted?
- What restrictions follow a missed call or repeated intraday deficit?
Choosing the account type
A cash account may fit when
- You want purchases funded entirely from money already deposited.
- You cannot tolerate owing a broker after a position falls or is liquidated.
- Your strategy can wait for T+1 settlement and does not depend on immediate reuse of sale proceeds.
- You prefer a simpler ledger and are willing to monitor settled cash before every purchase.
A margin account may fit only when
- You understand the agreement, interest calculation, collateral rules and liquidation authority.
- You can supply additional cash promptly if markets move against you.
- You have a documented reason for credit, such as a temporary liquidity need, and the borrowing cost is acceptable.
- You have verified the firm’s current intraday requirements rather than assuming another broker’s rules apply.
Margin is not automatically a better version of a cash account. It exchanges payment flexibility and possible borrowing capacity for an interest-bearing liability and intervention risk. Investment losses remain possible in either account.
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Before opening
- Read the account agreement, margin disclosure, fee schedule and cash-sweep terms in full.
- Write down how the firm defines settled cash, available buying power, maintenance equity and an intraday deficit.
- Check whether the firm can change house requirements or liquidate without contacting you first.
- Confirm which products and strategies require separate approval; do not infer permissions from the account label.
- Set a personal borrowing limit below the broker’s maximum and decide what market loss would trigger you to reduce exposure.
Before each order
- Identify whether the order will be paid from settled cash or create a margin debit.
- Check the estimated interest cost and the post-trade equity percentage if borrowing is involved.
- Review open orders and unsettled proceeds that could reduce available funds.
- For a same-day round trip in a cash account, verify that the purchase is fully funded without relying on a sale that has not settled.
- For a margin trade, confirm the firm’s intraday requirement and the amount of cash you could deliver immediately.
After execution
- Save the confirmation showing quantity, price, settlement date and whether a debit was created.
- Recheck balances after fills, partial fills, corporate actions or transfers; these events can change buying power.
- Respond to any deficit notice immediately and ask for the exact deadline and acceptable collateral.
- Do not assume a pending deposit cures a deficit until the firm confirms that the funds are credited and available.
Common mistakes and how to correct them
Mistake: treating total cash as settled cash
Correction: Use the broker’s settled-cash field and the stated settlement date. If the interface is unclear, obtain written clarification before trading.
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Mistake: assuming every same-day sale is freeriding
Correction: Trace the funding source. A fully paid purchase can be sold the same day in the SEC’s example; the violation arises when an unsettled sale is used to pay and the new security is sold before settlement.
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Mistake: assuming a margin call always gives time to respond
Correction: Read the liquidation clause. A firm may sell without advance notice, so maintain a cash reserve and do not rely on a phone call before a sale.
Mistake: using another broker’s interest rate or day-trading threshold
Correction: Compare the current agreement, rate sheet, netting method, house requirements and implementation status for your own firm.
Mistake: treating margin as risk-free because the account has cash
Correction: Check whether any debit balance exists after each trade and whether cash is automatically swept. A positive cash display does not by itself prove that no borrowing cost can accrue.
Practical decision checklist
Choose the account only after answering these questions in writing:
- Will I need to reuse sale proceeds before T+1?
- Can I fund every purchase with settled cash?
- Could I repay a margin debit immediately after a 20%, 40% or larger market decline?
- What annual and daily interest cost would my planned debit create?
- Which collateral percentage and intraday rules apply at my firm on the date I trade?
- What restriction would follow a payment violation or missed deficit?
- Whom will I contact if the platform shows conflicting cash and buying-power figures?
If you cannot answer the margin questions from the firm’s documents, do not borrow until the broker explains them. If you cannot track settlement in a cash account, reduce trading frequency or wait for proceeds to settle.
Bottom line
A cash account limits purchases to money you have available and avoids margin-loan debt, but it demands careful settlement tracking and can be frozen after freeriding. A margin account can support borrowing and different trading mechanics, yet interest, changing house requirements, collateral demands and forced liquidation can turn a market decline into a debt larger than your initial contribution. For frequent trading in 2026, verify whether your broker has adopted FINRA’s new intraday requirements, because the transition runs through October 20, 2027 and the applicable rules are firm-specific.
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