A balance transfer limit is the maximum amount of debt you can transfer from one credit card to another. By getting a limit that can cover your debts and moving them from a high-interest card to a card with lower interest, you can potentially save on interest payments.
The credit card issuer may set a balance transfer limit based on certain factors. This limit may be a fixed amount, or it may be a percentage of your total credit limit on the new card.
For example, American Express caps its transfers to $7,500, no matter how high your credit limit is. Or if you have a $7,000 credit limit with your Discover it Balance Transfer card, the amount you can transfer is limited to 97% because you have to account for the 3% balance transfer fee.