Balance transfers and 0% intro APR offers: the real cost, and where they exist

Examples use made-up numbers in neutral “units” unless a source amount is quoted; rates and fees in them are teaching assumptions, not offers.

A 0% balance transfer lets you move existing card debt to a card that charges no interest on it for a limited time, usually in exchange for a one-off transfer fee. It saves money only if you clear the balance (or most of it) before the promotion ends, don’t miss payments, and don’t add new spending to the card. Whether such offers exist at all depends on where you live: they are mainstream in the United States and the United Kingdom, but work very differently in Germany and much of continental Europe.

How a 0% offer works: four numbers, only one of them zero

Every 0% promotion is described by four numbers. Write all four down before comparing anything.

1. How long the 0% lasts. In the US, the Consumer Financial Protection Bureau (CFPB) found that over 99% of promotional rate offers made in 2023 and 2024 were 0% for an initial period of six to 21 months. CFPB Card Market Report 2025, p. 53.
2. The transfer fee. Usually a one-off percentage of the amount you move. Among the 25 largest US issuers, the average balance-transfer fee was 4.3% in the second half of 2024 (p. 161). A UK consumer guide describes typical UK fees as 1% to 3%. MoneySavingExpert.
3. The rate afterwards. Whatever is left when the promotion ends is charged the card’s normal rate. The average US general-purpose card APR was 25.2% in 2024 (CFPB, p. 5).
4. The transfer window. In the UK, offers often require the transfer within 60 to 90 days of opening the account to qualify (MoneySavingExpert).

There are also two kinds of 0%:

• A purchase promotion covers new spending for a set time, then the normal purchase rate applies.
• A balance transfer promotion covers debt moved from another card for a set time, then the normal rate applies to what remains.

They can come together or separately, each with its own end date.

Will you clear it in time? The formula and a worked example

The question that decides almost everything is whether your monthly payment repays the transferred balance before the promotion ends.

Payment needed to clear it in time = (balance + transfer fee) ÷ months at 0%

Example (made-up numbers, simplified monthly model). You owe 3,000 units on a card charging 24% a year and pay 100 units a month. An offer arrives: 0% on transferred balances for 18 months, then 24%, with a 3% transfer fee.

• Fee: 3,000 × 3% = 90 units. Your new balance is 3,090.
• Payment needed: 3,090 ÷ 18 = about 171.67 units a month (round up to 172).
• Cost if you pay that: the 90-unit fee, nothing else.
• The same 171.67 a month on the old card at 24% would take 22 months and cost about 728 units in interest. In this model, the transfer saves roughly 638 units.

Now the case most people end up in: you keep paying 100 units a month.

• After 18 months you have paid 1,800. Remaining: 3,090 − 1,800 = 1,290 units. Almost half of the debt is still there when the 0% ends.
• From then on, 24% applies. At 100 a month, clearing the rest takes another 16 months and about 217 units of interest.
• Total cost: 90 + 217 ≈ 307 units over 34 months.
• Staying on the old card at 100 a month: 47 months and about 1,627 units of interest.

Method: monthly interest = balance × (annual rate ÷ 12), then the payment is deducted; no new purchases or other fees. Real statements use daily balances, so results will differ. A shorter promotion changes the maths quickly: with the same fee and only 12 months at 0%, you would need 3,090 ÷ 12 = 257.50 units a month.

You can enter your own balance, fee, promotion length, follow-up rate and payment in the balance transfer planner.

Fine print that ends the 0% early or makes it expensive

Paying late

United States: an introductory rate has to stay in effect for at least six months, unless you are more than 60 days late on a payment, and the issuer must tell you how long it lasts and what rate applies afterwards. CFPB; Regulation Z § 1026.55. Beyond that legal minimum, read your card agreement.

United Kingdom: a consumer guide warns that if you miss the minimum monthly repayment, you could lose the 0% deal (MoneySavingExpert). An automatic payment of at least the minimum is the simplest protection.

New spending on the card

New purchases are usually not covered by a transfer promotion. In the UK, new spending or cash withdrawals are often charged at a high rate from day one (MoneySavingExpert). In the US, if you don’t pay the full balance by the due date you can lose the grace period, and new purchases are then charged interest from the date you make them. CFPB on grace periods. See also how card interest is calculated.

Where your payment goes

US: any amount you pay above the minimum must go to the balance with the highest APR first. Regulation Z § 1026.53. UK: firms must allocate repayments to the debt with the highest interest rate first, with limited exceptions for instalment plans. FCA CONC 6.7.4R. These rules help you, but the cleanest set-up is still a transfer card used only as a parking space for old debt. Minimum payments explains why the required minimum and your payoff plan are different things.

Deferred interest vs a true 0% promotion (US)

US stores often offer “no interest if paid in full within 12 months”. That is deferred interest, not the same as “0% intro APR for 12 months, then the regular rate”.

The CFPB’s example: a $400 TV, $25 paid each month, $100 left after 12 months. With a true 0% promotion you owe $100 and interest starts from there. With deferred interest, interest from the purchase date is added back and you owe $165. CFPB blog (2017).

The scale is large: US consumers made over $70 billion in purchases on deferred-interest plans in 2024 and were charged more than $3.8 billion of deferred interest, up from just under $2 billion in 2021. Consumers with subprime and deep-subprime scores incurred nearly one-sixth of the deferred interest charged in 2021–2024 while accounting for less than one-twentieth of the purchase volume (CFPB report, pp. 151–159).

A practical rule: “intro APR” usually signals a true 0% promotion; “no interest if paid in full” usually signals deferred interest. Check the terms either way.

Does 0% exist where you live?

United States. 0% promotions are everywhere: in 2024, cards with a 0% introductory APR accounted for $899 billion of purchase volume and $352 billion of balances (CFPB, p. 5). Three years after opening, average balances on cards that had a promotion were still 69% higher than on cards without one (p. 57). People who choose these cards may borrow differently, so this is a pattern, not proof of cause.

United Kingdom. Balance-transfer cards are a mainstream product. In February 2026 a UK consumer site reported the longest balance-transfer offer since 2018: “up to” 38 months at 0%, with a 3.49% fee and a 24.9% representative APR afterwards. MoneySavingExpert, 24 Feb 2026. “Up to” means some applicants are offered a shorter period. This is a dated market example, not a current offer or a recommendation.

Germany. The typical German credit card is a charge card: the full amount is taken from your current account at the end of each billing period, so there is no revolving balance to transfer. VIS Bayern. Revolving cards (“Teilzahlung”, partial repayment) exist; the Bavarian consumer portal warns that interest on the unpaid part can exceed 15 to 20 percent and that partial repayment is sometimes pre-selected. In our own check of German comparison results in October 2026 we found no balance-transfer category; this is our observation, not an official statistic, and individual offers may exist.

Where 0% does appear in Germany is retail financing. The German Federation of Consumer Organisations (vzbv) describes a common set-up: a purchase financed at 0% through a revolving credit line with a credit card attached. Interest-free periods such as six, ten or twelve months are typical; in its example, an 800-euro fridge at 0% for ten months means 80 euros a month. The credit line stays open, and using it again or running past the 0% period usually triggers interest. vzbv (2022).

European Union. The revised Consumer Credit Directive (EU) 2023/2225 states that credit granted free of interest and without other charges should not be excluded from its scope (recital 15), and it is scheduled to apply from 20 November 2026. National rules and timing can differ, so check your country’s regulator. EUR-Lex.

Elsewhere. Rules vary widely. India’s central bank, for example, told banks in 2008 to refrain from offering low or zero percent rates on consumer durable loans built on manufacturer or dealer discounts, because such schemes “lack transparency” and distort loan pricing. RBI Master Circular, para 2.11. Check current local rules before relying on any 0% scheme.

Who pays for the zero?

If you clear the balance in time, you pay little more than the fee. The rest of the business model is paid for elsewhere:

• Fees. US card issuers collected $2.1 billion in balance-transfer fees in 2024 (CFPB, section 3.3.4).
• Leftovers. Any balance remaining when the promotion ends is charged the normal rate.
• Continued spending. A survey cited by the CFPB found that 52% of cardholders keep spending on the card after the intro period ends (p. 53).
• Retail prices. In shop financing, the retailer typically pays the finance provider a fee that can be built into the product price (vzbv; Verbraucherzentrale).

What applying does to your credit file

• US: for most people, one additional hard inquiry takes less than five points off their FICO Scores; inquiries count for about a year and stay on the report for up to two years. myFICO.
• UK: eligibility checkers use soft searches, which lenders can’t see; most hard searches stay on your report for 12 months, and many applications in a short time can worry lenders. Experian UK.
• Germany: the new SCHUFA score awards 117 points for no applications or openings of current accounts and credit cards in the past 12 months, 82 for one, 44 for two and none for three or more; several within 28 days count once. SCHUFA.

More on how files and scores differ between countries: credit scores and reports.

How to compare 0% offers where you live

1. Write down the four numbers for each offer: promotion length, fee (and minimum fee), rate afterwards, transfer window.
2. Calculate the payment needed: (balance + fee) ÷ months at 0%. Compare it with what you can pay every month, including irregular expenses.
3. Check whether the wording means a true 0% promotion or deferred interest.
4. Read how late payments and new purchases are treated.
5. Use soft-search eligibility tools where they exist and keep applications close together.
6. Check local rules with your regulator or consumer centre: CFPB (US), FCA and MoneyHelper (UK), Verbraucherzentralen (Germany).

Common mistakes

• Comparing promotion length but ignoring the fee and the rate afterwards.
• Keeping the old payment amount instead of the one that clears the balance in time.
• Using the transfer card for new purchases.
• Missing one payment and losing the promotion (UK) or triggering penalty pricing (US).
• Treating “no interest if paid in full” as a true 0% promotion.

Questions people ask

Is a 0% balance transfer worth it?

Only if the interest you avoid clearly exceeds the fee and you can clear most of the balance in time. In our example, a 90-unit fee replaced about 728 units of interest.

What happens when the 0% period ends?

The remaining balance is charged the card’s normal rate from then on. With a deferred-interest plan in the US, interest from the purchase date can be added back if the promotional balance is not paid in full.

Can I do a balance transfer in Germany?

US- or UK-style balance-transfer cards are not mainstream there, because most cards are charge cards. With expensive revolving debt, compare an instalment loan and read debt consolidation: the math before switching products.

Should I transfer or use avalanche/snowball?

They solve different problems. A transfer lowers the rate for a while; a repayment order decides which debt you attack first. See avalanche vs snowball.

What if the numbers don’t work at all?

A new card is not a rescue. Free, non-profit help exists: credit counselling organisations in the US are usually non-profit and offer free or low-cost advice (CFPB); the UK government lists free debt advice services (GOV.UK); in Germany, municipalities, welfare organisations and Verbraucherzentralen offer free Schuldnerberatung (Verbraucherzentrale). Asking early keeps more options open.

This guide is general education, not financial advice, and does not recommend any card or provider.