What 0% for 12 Months Really Means (and What It Costs)

“0% for 12 months” means you pay no interest for a set time, not forever. To get the full benefit, divide what you owe (plus any fee) by 12 and pay that every month.

What does “0% for 12 months” mean?

A 0% deal is a time-limited offer where a lender charges no interest on part or all of what you owe.

It is also called an introductory or promotional rate. You see it in three main places:

• 0% on purchases. New spending on a card has no interest for a while.
• 0% balance transfer. You move a debt from one card to another card with a 0% rate.
• “No interest if paid in full” deals. Often offered in stores on bigger items. These can work differently (more below).

The CFPB, the US consumer regulator, says the promotional rate on most balance transfers lasts for a limited time. After that, the rate may rise, and so can your payment.

Is a 0% balance transfer free?

Usually not. There is often a fee to move the debt.

Balance transfer fee is a charge for moving a debt to a new card, usually a percentage of the amount moved.

MoneyHelper says these fees are often around 2–4% of the amount moved. It advises checking that the fee does not cost more than you would save.

There can be other catches. MoneyHelper warns that new purchases on the new card might not get the 0% rate.

What happens when the 0% period ends?

The rate goes up to the card’s normal rate. MoneyHelper says you could lose the promotional rate and be charged a higher standard rate.

So anything you still owe on that day starts to collect interest. The deal did not remove the debt. It only paused the interest.

What does this look like with real numbers?

Say you move $3,000 to a card with 0% for 12 months. The transfer fee is 3%. After the deal, the rate is 21.71% a year. In this example, the fee is added to your balance. You add no new spending.

Step 1. The fee. 3,000 × 0.03 = $90. You now owe $3,090.

Step 2. The payment that clears it in time. Divide the balance by the months: 3,090 ÷ 12 = $257.50. Round up to $258 a month. After 12 months, you owe nothing and paid no interest.

Step 3. If you pay only $50 a month instead. 50 × 12 = $600 paid. You still owe 3,090 − 600 = $2,490 when the deal ends.

Step 4. Interest starts. Monthly rate: 21.71 ÷ 12 = 1.81%. First month of interest: 2,490 × 0.0181 = about $45.

Now $45 of your $50 goes to interest. Only $5 goes to the debt. If you keep paying $50, it takes about 129 months (nearly 11 years) to clear, with about $3,958 of interest.

The formula, in words: monthly payment = (balance + fee) ÷ months in the deal. This works because there is no interest to add during the 0% period.

(Why the payment barely moves the debt: see why the minimum payment keeps you in debt.)

What is deferred interest, and why is it different?

Deferred interest means interest is not charged during the deal, but it can be added later if you don’t pay the full amount in time.

These are often sold as “no interest if paid in full within 12 months”. The CFPB explains how they work:

• Interest is usually worked out from the day you bought the item.
• If you have not paid it all off by the end, you can be charged all that interest, for each month, back to the start.
• Being more than 60 days late on a minimum payment can also end the deal early.
• Minimum payments usually won’t pay it off in time.

So with deferred interest, $1 left at the end can cost a year of interest. Read the terms for “deferred” or “if paid in full” before you sign.

(Store financing and pay-later plans have their own small print. See buy now, pay later.)

How do you get the most from a 0% deal?

Treat it as a plan with an end date, not a break.

Do this today (10 minutes)

• Find the date your 0% deal ends. Check if it is a “deferred interest” deal.
• Add your balance and any fee. Divide by the months left. That is your monthly target.
• Set up an automatic payment for that amount, or at least the minimum, so you never pay late.

Nada does this math for you. Add the deal’s end date and see the payment that clears it in time. Get Nada

Want to compare the rate after the deal ends? See APR explained.

FAQ

Is a 0% deal really free? Not always. Balance transfers usually have a fee, often 2–4% of the amount moved. You also still have to pay at least the minimum each month. The deal is only close to free if you clear the whole balance before the 0% period ends and add no new spending.

What happens when the 0% period ends? The rate goes up to the card’s normal rate. Any balance still left starts to collect interest from then on. With some deals, called deferred interest, it can be worse: you may be charged interest back to the day you bought the item if you have not paid it off in time.

How much should I pay each month on a 0% deal? Take the full balance, including any fee, and divide it by the number of months in the deal. In the example, $3,090 ÷ 12 = $257.50, so $258 a month. Paying that clears the debt before any interest starts. Paying only the minimum usually leaves a large balance.

Can I lose the 0% rate early? Yes. The CFPB explains that if you are more than 60 days late on a payment, the card company can raise the rate on all balances, including a transferred one. Always pay at least the minimum on time. Setting up an automatic payment helps.

Sources

Read in October 2026.

• CFPB: Credit cards key terms
• CFPB: No interest if paid in full within 12 months — how does this work?
• MoneyHelper: Transferring your credit card balance

Written by the Nada team. Reviewed October 2026.

This is general information, not personal advice.