How to Pay Off Credit Card Debt When One Card Has 0% APR and Another Is at 29%

If one of your cards is at 0% APR and another is charging something brutal like 29%, the default move is usually simple: make every minimum payment, then send your extra money to the highest-APR balance first. The catch is that a promotional 0% rate has an expiration date. If you ignore that date, you can accidentally carry a big balance into the expensive phase and lose part of the advantage.

So the real strategy is not “always ignore the 0% card” or “always kill the promo card first.” It is this:

• Protect both accounts by making minimums on time.
• Attack the balance that is costing you the most interest today.
• As the 0% end date gets close, test whether you need to pivot some extra cash to avoid being stuck with a large post-promo balance.

Why the 29% card usually deserves your extra payment first

The Consumer Financial Protection Bureau explains that many issuers calculate interest using a daily periodic rate, which means interest keeps building on revolving balances day by day.¹ In plain English: the 29% card is your financial leak. The longer that balance hangs around, the more money it drains.

Meanwhile, a legitimate 0% promotional APR can temporarily stop purchase or balance-transfer interest on that card, depending on the offer terms. During that window, a dollar sent to the 29% card usually produces more immediate savings than a dollar sent to the 0% card.

The exception: do not sleepwalk past the promo expiration date

This is where people get sloppy. A 0% card is cheap for now, not forever. If the promotion ends soon and you still have a large balance there, your plan can get worse fast. The right question is:

Can I materially shrink the high-APR card first and still avoid carrying an ugly balance on the promo card once the intro rate ends?

If the answer is yes, stay focused on the 29% card. If the answer is no, start shifting some extra money toward the 0% balance before the expiration date. You are not breaking the avalanche method. You are adjusting for a time-limited rate change.

A practical example

Here is a simplified illustration using monthly math for readability:

• Card 1: $4,000 at 29% APR, $120 minimum
• Card 2: $3,000 at 0% APR for 8 months, then 24.99% APR, $75 minimum
• Extra debt-payoff money: $500 per month beyond minimums

In this setup, prioritizing the 29% card first and then pivoting before the promo expires beats splitting the extra payment evenly every month.

What to do month by month

1. List both APRs, both minimums, and the exact 0% expiration month. Do not trust memory. Pull the statements.
2. Autopay the minimum on both cards. The CFPB notes that minimum payments keep the account current, but paying only minimums can stretch repayment out for years or even decades.²
3. Send all current extra money to the most expensive balance. In this scenario, that is the 29% card.
4. Re-check the plan 60 to 90 days before the promo expires. If the promo balance is still large, model a pivot.
5. Ignore “shortcut” companies promising secret rate tricks. The FTC warns that firms charging upfront fees to lower your card rate are often selling something you can usually try yourself for free by calling your issuer directly.³

When it makes sense to shift extra money to the 0% card early

Start redirecting extra payments before the promo ends if one or more of these are true:

• The 0% period has only a few months left.
• The remaining promo balance is too large to clean up later without stress.
• The post-promo APR is close to the other card’s APR anyway.
• You know your income will drop or get less predictable around the time the intro rate ends.

That is the part generic debt advice skips. Your best answer depends on timing, not just APR rank.

Common mistake: splitting the extra payment evenly

Splitting your extra money across both cards feels balanced, but it often underperforms. You usually end up leaving the 29% balance alive longer than necessary while also failing to solve the promo balance before its rate resets. It is the worst of both worlds: slower interest savings now and a weaker position later.

Use Debt Freedom Planner to test both paths before the promo ends

This is exactly where Debt Freedom Planner helps. Build two versions of your payoff plan:

• Plan A: minimums on both cards, all extra to the 29% balance until the promo is nearly over
• Plan B: minimums on both cards, but start shifting extra to the 0% balance earlier

Compare the payoff date, total interest, and how exposed you are when the promo expires. The best plan is not the one that sounds smartest on social media. It is the one your actual balances, APRs, and timeline say is cheaper.

Bottom line

If one card is at 0% and another is at 29%, the extra payment usually belongs on the 29% card first. But the promo clock matters. Once the 0% deadline gets close, rerun the plan and decide whether you need to shift gears. That is not being inconsistent. That is doing debt payoff like an adult instead of a slogan.