Brokers require you to keep a certain percentage of equity in your account (usually 25% or higher). If you dip below this, you’ll face a margin call , where your buying power hits zero (or goes negative), and you're forced to deposit cash or sell assets.
While it sounds simple, how it’s calculated depends entirely on what kind of account you’re using. 1. Cash Account Buying Power stock buying power
In a standard cash account, your buying power is straightforward: it is the you have on hand. Brokers require you to keep a certain percentage
This is where things get more powerful—and more dangerous. A margin account allows you to borrow money from your broker to buy more stock than you could with your own cash. A margin account allows you to borrow money
Some brokers offer even higher leverage (up to 4x) for "day trading," provided you maintain a minimum balance (usually $25,000). 3. Why Buying Power Fluctuates
is essentially the total amount of money you have available to purchase securities. Think of it as your "spending limit" at the brokerage mall.
If the stocks you already own drop in value, your equity decreases. Because your borrowing limit is tied to your equity, your buying power drops too.