How Balance Transfers Work
Updated 27 March 2026
A balance transfer moves your existing credit card debt to a new card offering 0% interest. Here is a plain-English breakdown of the full process, from application to payoff, including the parts most people overlook.
The Basic Mechanic
When you carry a balance on a standard credit card charging 20% to 30% APR, roughly half of each minimum payment goes toward interest rather than reducing your debt. On a $5,000 balance at 22% APR, you pay approximately $92 in interest every month. That is $1,100 per year in pure interest.
A balance transfer card with 0% intro APR eliminates that interest charge for the duration of the introductory period, typically 12 to 21 months. Every payment you make goes directly toward reducing the balance. If you pay $277/month on a $5,000 balance over 18 months, you clear the debt entirely before any interest applies.
The catch is a one-time transfer fee, typically 3% to 5% of the transferred amount. On $5,000, that is $150 to $250 upfront. Even with this fee, the net saving versus staying on a 22% APR card for 18 months exceeds $900.
The Transfer Process Step by Step
Apply for a balance transfer card
Select a card with a 0% intro APR on balance transfers and apply. The application triggers a hard credit inquiry. Most decisions come back in minutes online, though some may take 7 to 10 business days. You need to be approved before you can request a transfer.
Request the balance transfer
After approval, log into your new account online or call the issuer to initiate the transfer. Provide your old card's account number and the amount you want to move. You can typically transfer up to 90% to 95% of your new credit limit. Most issuers require you to request the transfer within 60 to 120 days of account opening to qualify for the 0% rate.
The new card pays off your old card
The new issuer sends payment directly to your old card issuer. This process takes 5 to 14 business days. Continue making minimum payments on your old card until you confirm the transfer has completed and the balance shows as zero. Missing a payment during this window can result in late fees.
Transfer fee is added to your new balance
The transfer fee, typically 3% to 5% of the transferred amount, is added to your new card balance on the day the transfer is processed. If you transfer $5,000 with a 3% fee, your opening balance on the new card is $5,150. The fee does not affect the 0% promotion. Your new balance is $5,150 at 0% APR.
Pay down the balance during the 0% window
Divide your total balance by the number of intro months to find the monthly payment needed to clear the debt before the rate resets. Set up autopay for at least the minimum payment to protect the 0% offer, and pay the calculated amount manually or as a fixed payment above the minimum each month.
What Happens to Your Old Card?
Your old card does not close automatically when you transfer the balance. It becomes a card with a zero balance and its full credit limit available. This is actually positive for your credit score, as it reduces your overall credit utilization ratio.
Keep the old card open
Unless the card charges an annual fee, keeping it open and unused maintains your total available credit and credit history length. Put a small recurring charge on it, like a $10 streaming subscription, and pay it in full each month to keep the account active.
Avoid using it for new debt
The biggest risk after a successful transfer is running up the old card again. Remove it from your wallet. If you have a history of overspending, consider setting a low credit limit on the old card or leaving it at home entirely.
Transfer Timeline Overview
| Stage | Typical Timeframe |
|---|---|
| Application approval | Instant to 10 business days |
| Card arrives in mail | 5 to 10 business days |
| Transfer request deadline | Within 60 to 120 days of opening |
| Transfer processing time | 5 to 14 business days |
| 0% intro period begins | From account opening date |
The 0% intro period starts from account opening, not from the date of transfer. Apply and transfer quickly to maximise the window available.
Ready to compare balance transfer cards?
Use our comparison table and calculator to find the card with the right intro period for your balance, and see your exact net saving before you apply.