Balance Transfer Cards: Use 0% Deals Before They Shrink

Martin Lewis, the UK's most trusted money-saving expert, issued an "important alert" on October 19, 2026: the 0% balance transfer deals that millions use to cut the cost of credit card debt are about to get worse. "I'm concerned the deals you can get to cut the cost are about to get worse," he warned on X. "So acting sooner is safer."

His timing isn't random. With the Bank of England expected to raise base rates and the US Federal Reserve already back in a hiking cycle (the Fed's September 2026 hike took its benchmark to 3.75–4.00%), lenders' own borrowing costs are climbing — and they pass those costs to consumers. If you carry credit card debt, this is the moment to understand balance transfer cards: how they work, what they really cost, and how to use one before the best deals shrink.

How a 0% balance transfer card works

A balance transfer card is a credit card that offers a promotional 0% interest rate on debt you move onto it from other cards. The process is straightforward:

1. You apply for the new card. Most offers require you to request the transfer within 60 to 90 days of opening the account — miss that window and the 0% deal can vanish.
2. The new issuer pays off your old card. You never touch the money; the new bank settles the old balance directly.
3. Your debt moves to 0%. The transferred amount sits at 0% interest for the promotional period — typically 12 to 21 months in the US, and up to around three years on some UK deals.
4. You pay a one-time transfer fee. Almost every offer charges 3% to 5% of the amount transferred, added to your new balance on day one. Transfer $10,000 at a 5% fee and you owe $10,500 immediately.

During the promotional window, every payment goes entirely toward the principal rather than interest. That is the genuine benefit — and the only reason the card exists.

The math: when it actually saves money

A concrete example makes the trade-off clear. Say you owe $6,000 on a card charging 22% APR and can pay $400 a month:

	Stay on the 22% card	Transfer to 0% for 18 months (3% fee)
Upfront cost	$0	$180 transfer fee
Interest paid	~$980	$0 (paid off within the promo window)
Time to clear	~17 months	15 months
Total cost of the debt	~$980	$180

The fee looks like a penalty, but it is closer to a one-time insurance premium against interest: $180 versus nearly $1,000. The transfer only wins, though, if you clear the balance before the promotional rate ends.

Balance transfers don't reduce your debt — they pause the interest. The card is a calendar, not a cure.

The four changes Martin Lewis is warning about

Lewis spelled out four ways 0% deals will deteriorate as rates rise. His warning is UK-specific, but the mechanics apply wherever banks face higher funding costs:

1. Shorter 0% periods. The headline interest-free window gets shorter — and in the UK, that headline is an "up to" figure. Lewis notes fewer applicants will actually get the advertised three years; some will get two, some one.
2. Higher one-off fees. The fee for moving a balance is creeping upward, shrinking the math advantage.
3. Higher rates after the 0% ends. The "go-to" APR — what you pay on any balance left when the promo expires — can rise.
4. Tighter eligibility. Lewis calls this the most likely and hardest-to-spot change: banks approve fewer people for the best deals. The 0% card still gets advertised — you just won't qualify for it.

That fourth point is why "acting sooner is safer." Waiting means shorter deals, bigger fees, and a higher chance of being turned down.

How to use a balance transfer card properly

1. Check eligibility before you apply

Every application triggers a hard credit check. In the UK, use an eligibility calculator (MoneySavingExpert offers one) to see your likely terms without hurting your credit file. In the US, many issuers offer pre-qualification that doesn't affect your score. Once you're in, transfer at application — most offers restrict transfers to the first 60–90 days, and processing takes 3 to 7 business days.

2. Pick the right card for your repayment speed

Lewis's rule: choose the lowest fee within a 0% term long enough to clear your debt. Longer 0% windows usually carry bigger fees, so if you can genuinely repay quickly, a shorter deal with a smaller fee costs less. If you're not sure, go long — a slightly bigger fee beats getting stranded at 25% APR. Move the most expensive debt first: you can usually only transfer up to your new credit limit (in the UK, often only 90% of it), so target the highest-APR balance.

3. Never miss the minimum payment

A missed minimum can mean a fee and, on some cards, losing the 0% rate entirely. Set up a direct debit (US readers: autopay) so this can't happen by accident.

4. Don't spend on the new card

New purchases usually sit at the full purchase APR, and many issuers apply your payments to the 0% balance first — so new spending accrues interest while you pay down the transfer. Keep the card off-limits for shopping and never use it for cash withdrawals.

When a balance transfer is the wrong move

Balance transfers work for a specific problem: a stable income, a manageable balance, and a realistic plan to clear it within the promotional window. They are the wrong tool when:

• The fee beats the interest you'd save. If you'll clear the debt in three months, a 4% fee may cost more than the interest you'd have paid. Do the fee math first.
• You'll keep spending. Shifting debt and then running up the old card again leaves you with two balances instead of one.
• The debt is overwhelming. If minimum payments are already a struggle, a 0% shuffle is not a strategy. In the UK, free help exists from StepChange and Citizens Advice; in the US, nonprofit credit counselors through the NFCC can set up debt management plans. These are often better than any card.
• Your income is unstable. The whole plan depends on steady monthly payments. Without them, the post-promo APR cliff is brutal.

Frequently asked questions

Does a balance transfer hurt my credit score?

Applying creates a hard inquiry, which can dip your score temporarily. But a successful transfer also increases your total available credit and — if you pay down the balance — lowers your utilization ratio, which helps. The net effect is usually neutral to positive within a year.

Can I transfer balances between cards from the same bank?

Almost never — the transfer must come from a different lender. Note this when choosing: your new card can't be with the bank holding the debt.

What happens to my old card after the transfer?

It stays open with a zero (or near-zero) balance unless you close it. Many experts recommend leaving it open — an unused card with no balance helps your credit utilization — but only if you can trust yourself not to spend on it.

Will the deals really get worse?

That's exactly what Martin Lewis warned on October 19: with the Bank of England expected to raise base rates and the Fed already hiking in the US, banks' funding costs are rising. Historically, higher base rates mean shorter 0% periods, bigger fees, and stricter eligibility — which is why acting while today's deals still exist is safer.

The bottom line is the one Lewis ended his alert with: "Sooner is safer." Check what you qualify for now, confirm the fee beats the interest you'd pay anyway, and set a fixed monthly target. The 0% window is a head start, not a finish line — but used properly, it's one of the cheapest ways out of expensive credit card debt.