Balance transfers: worth it or not?

A 0% offer can save you hundreds — or cost you a fee to move a problem you never solve. The difference comes down to one division sum.

How a balance transfer works

You move debt from a high-rate card onto a new card offering 0% APR for an introductory period — commonly 12 to 21 months. During that window every dollar you pay attacks the principal rather than the interest, which is the entire point.

You almost always pay a transfer fee of 3–5% of the amount moved, charged upfront and added to the new balance.

When it's clearly worth it

When it isn't

You can't clear it before the promo ends

This is the main trap. If the balance is still there when the introductory period expires, the rate jumps to the card's standard APR — frequently higher than what you left. You paid a fee to move the problem, not solve it.

Before applying, do one division: balance ÷ promotional months. If you can't afford that monthly payment, a transfer alone won't fix anything.

The fee outweighs the saving

On a small balance you'd clear in a few months anyway, a 3–5% fee can cost more than the interest you'd avoid. Run both numbers rather than assuming 0% is automatically better.

You keep spending on the old card

Clearing a card to zero and then using the free credit limit is how people end up with two balances instead of one. This is common enough that it's worth planning against explicitly.

Things buried in the terms

• New purchases may not be at 0%. Some cards only apply the promo to transferred balances. Purchases can accrue at the standard rate immediately — safest to treat a transfer card as transfer-only.
• A late payment can end the promo. Many agreements let the issuer cancel the introductory rate if you pay late. Automate the minimum at least.
• You usually can't transfer between cards from the same issuer. Check before applying.
• Your approved limit may be lower than your balance. You may only be able to move part of the debt.
• Transfers take time. Often one to three weeks. Keep paying the old card until the transfer confirms — a missed payment in the gap is a costly own goal.

The effect on your credit score

Short term, applying triggers a hard inquiry that typically dips your score slightly. Longer term the picture is often positive: a new card raises your total available credit, which lowers your utilisation ratio — a significant scoring factor.

Keep the old card open once it's cleared. Closing it removes that credit limit and can push utilisation back up, undoing the benefit.

The alternative worth considering first

Call your existing issuer and ask for a lower rate. It costs one phone call, there's no fee and no hard inquiry, and cardholders with reasonable payment histories sometimes get a reduction. It won't beat 0%, but it's free to ask and takes ten minutes.