If you’re carrying high-interest credit card debt, there may be a recourse for you: enrolling in a balance transfer card.

The concept is straightforward: You move existing debt onto a new card that offers a lower, or even zero, interest rate for a set period. Used thoughtfully, this tool may give you a window to pay down debt more efficiently. But like most financial products, the details matter quite a bit.

How balance transfers work

When you open one of these cards, you request that your new card issuer pay off the balance on your existing card or cards. That debt then moves to your new account, ideally at a much lower interest rate. Many balance transfer cards advertise an introductory period—often between twelve and twenty-one months—during which little or even no interest accrues on the transferred balance. The goal is to use that window to make meaningful progress on the principal before the promotional rate expires and the standard rate kicks in.

The upfront costs to watch for

Balance transfers are rarely free. Most cards charge a transfer fee, which may be between 3 and 5 percent of the amount you’re moving. On a $10,000 balance, that’s $300 to $500 added to what you owe from the start, which is worth calculating before you apply. If the fee is close to what you’d save in interest during the promotional period, the math may not work in your favor. Some cards do offer zero-fee transfers, though these tend to come with shorter promotional windows or other trade-offs, so it pays to read the fine print carefully.

What happens when the promotional period ends

This is where many balance transfer strategies go sideways. The promotional rate is temporary, and the standard interest rate that follows may be just as high (or higher) than the rate you started with. If you haven’t paid off most or all of the transferred balance by the time the promotional period expires, the remaining debt will start accruing interest at the new standard rate.

For that reason, the most important question to ask before opening a balance transfer card is whether you can realistically pay off the balance within the promotional window, not just whether you can qualify for the card.

The credit score impact

Applying for a new credit card typically results in a hard inquiry on your credit report, which may cause a small, temporary dip in your credit score. Opening a new account also affects the average age of your credit history. On the other hand, successfully transferring a balance and reducing your overall credit utilization—the ratio of what you owe to your available credit—can have a positive effect over time. The net impact on your credit profile will depend on your overall situation, so this is worth thinking through before applying.

Does a balance transfer make sense for you?

These programs tend to work best when you have a clear and realistic plan to pay off the transferred balance before the promotional rate ends, when the interest savings meaningfully outweigh the transfer fee, and when you can resist adding new charges to either the old card or the new one. It’s generally less effective as a solution if the underlying spending habits that created the debt haven’t changed—or if the balance is too large to retire within the promotional window. In that case, you may simply be delaying the problem rather than solving it.

Balance transfer cards can be a useful tool in the right circumstances, but they work best as part of a broader strategy for managing and reducing debt, not as a standalone fix. If you’re considering one, talking through the specifics with a financial advisor may help you determine whether it fits your overall picture and what to pair it with to make the most of the opportunity.