What Does a Brokerage Account's "Buying Power" Figure Represent?
The “buying power” figure shown in a brokerage account is one of the more commonly misread numbers on the screen, mostly because it doesn’t always match what most people picture when they think of cash on hand.
The short answer
Buying power is the total dollar amount currently available to place a trade, and it can be larger than the account’s actual settled cash balance because it factors in things like proceeds from a recent sale that haven’t finished settling and, in accounts where it’s enabled, available margin. In other words, it’s a trading limit, not a direct snapshot of money sitting in the account.
What goes into the figure
Several things typically feed into buying power. Settled cash — money that’s fully cleared and available — is the base layer. On top of that, many brokerages add some or all of the proceeds from a recent sale even before that trade has fully settled, under rules that let investors reinvest without waiting out the full settlement period. In accounts with margin enabled, buying power can also include borrowing capacity against existing holdings, which is why margin accounts often show a noticeably higher figure than the cash sitting in them would suggest. The exact mix of these components, and how much weight each one gets, is set by the individual brokerage’s own policies rather than a single universal formula, which is part of why the same account balance can produce different buying power figures at different firms.
Why it’s not the same as the cash balance
Because buying power blends several sources, it’s a fundamentally different figure than the account’s cash balance. Two accounts holding the identical amount of settled cash can show very different buying power numbers depending on whether margin is enabled, whether a recent sale is still settling, and what the brokerage’s own rules allow for using unsettled funds. That’s a common source of confusion for anyone comparing two accounts side by side and expecting the higher cash balance to automatically mean the higher trading capacity.
When the figure can be misleading
Treating buying power as equivalent to spendable cash is where confusion tends to start. If a purchase relies on unsettled proceeds or borrowed margin capacity, and something about that underlying trade doesn’t go as expected, the account can end up with a negative cash balance rather than the comfortable cushion the buying power number implied. This is especially easy to miss right after a large sale, when the buying power figure can jump immediately even though the cash from that sale hasn’t actually finished clearing.
Reading the figure more carefully
Most brokerage platforms display more than one number: cash balance, settled funds, and buying power are often broken out separately in the account summary, even though buying power tends to get the most visual prominence. Checking which of those figures a planned trade would actually draw from is a more reliable habit than trusting a single headline number, particularly for a trade sized close to the full amount shown as available.
What to weigh
Buying power is a useful ceiling for what’s tradable in the moment, but it isn’t a description of money the account currently owns outright. Understanding what’s actually feeding that number — settled cash, pending settlement, or margin — makes it much easier to interpret correctly, and it turns a single confusing figure into a set of components that each behave in a predictable, explainable way.