Balance transfers and consolidation in a payoff plan

Updated October 27, 2026

A transfer or a consolidation loan replaces one APR with another, usually charges a fee up front, and sometimes tempts you to lower the payment. The calculator can model the "before" debts and the "after" debt as two separate runs. It cannot change an APR in month 13 of a single run, and it has no fee field. The examples below use the same monthly rule — interest equals balance × APR / 12, then the payment — and add the fee and the rate change by hand. Every figure is an assumption, not an offer.

A transfer that finishes most of the balance at 0%

Assumptions: you owe $4,800 at 24.99% APR and you will pay $220 every month either way. The offer is a 3% transfer fee and 0% for 18 months, then 22.99%. The fee is 4,800 × 0.03 = $144, so the new balance starts at $4,944. You do not pay less just because the promo minimum is lower. The comparison holds the $220 still.

During the 18 months at 0%, the full $220 reduces principal. The balance at the end of month 18 is $984. The remaining months are at 22.99%, and they add $54.98 of interest. Total paid includes the $144 fee, because the fee was part of the starting balance. Compared with keeping the card, you pay $1,467.80 less and finish seven months sooner, under these assumptions. The promo did the work because most of the balance was gone before the rate came back.

You can check the "keep the card" column on the calculator: one debt, balance 4800, APR 24.99, minimum 220, extra 0. The screen rounds interest to $1,667. The transfer column cannot be checked in one run, because the APR changes.

A transfer that costs more than staying

A fee plus a short promo plus a higher rate afterward can lose to a card you were already paying down. Assumptions: $3,000 at 14.99% APR, and you will pay $200 a month either way. Left alone, that card takes 17 months, costs $342.94 of interest, and you pay $3,342.94 in total.

The offer is a 5% fee ($150), so the new balance is $3,150, at 0% for 6 months, then 27.99%. You still pay $200. After six months the balance is $1,950. The high rate applies to that leftover. The plan finishes in month 18, with $288.43 of interest and $3,438.43 paid in total.

Interest alone looks lower ($288.43 versus $342.94). Total paid is $95.49 higher, and the finish is one month later, because the $150 fee is larger than the interest the promo avoided. A 0% headline is not the comparison. The comparison is total paid, the month you finish, and the rate on whatever is left when the promo ends.

Putting a transfer into the avalanche list

If you do take a promo, the payoff plan for your other debts changes. A 0% balance is the last place avalanche sends extra money, and it may be the first place snowball sends it if the transferred amount is the smallest balance. While the promo is running, extra dollars usually do more on a balance that is still charging 20% than on a balance charging 0%. When the promo end date is close and a large balance will jump to a high rate, that ranking can flip. This calculator will not flip it for you. Run the other debts as their own plan, and treat the promo balance as a deadline: payment times months remaining, minus the promo balance, is the gap you still have to cover before the rate changes.

Also check whether the transfer fee is added to the card and whether new purchases on that card lose the grace period. Neither one is in the calculator. The interest guide explains the grace period this model ignores.

Consolidation: same payment, then a lower payment

Assumptions for the cards, with no extra payment and fixed minimums:

• Card A: $3,000 at 24% APR, minimum $75.
• Card B: $2,500 at 19% APR, minimum $65.

You already send $140 a month. Avalanche and snowball match on this pair when extra is $0, because the only rollover happens after one card is gone and a single debt is left. The plan takes 71 months and $4,324.67 of interest. Total paid is $9,824.67.

Replace both with one loan of $5,500 at 11% APR and keep paying $140. One row on the calculator produces 49 months, $1,350.11 of interest, and $6,850.11 paid. That is $2,974.56 less interest and 22 fewer months, if the loan has no fee and the payment really stays $140.

Add a 5% origination fee so you borrow $5,775 at the same 11% and the same $140. The plan takes 53 months and $1,513.03 of interest. Total paid is $7,288.03. Interest is $2,811.64 lower than the two cards, but you also repay the $275 fee, so the drop in total paid is $2,536.64 (9,824.67 − 7,288.03), and you finish 18 months sooner. The fee hurt. It did not erase the lower rate, at this payment.

Drop the loan payment to $100, which is less than the $140 you were already paying. With no fee, $5,500 at 11% takes 77 months and $2,187.97 of interest. Interest is still lower than $4,324.67, and the term is six months longer than the 71-month card plan. With the 5% fee, $5,775 at 11% and $100 a month takes 83 months and $2,484.85 of interest. A lower rate with a smaller payment can stretch the debt past the plan you already had. The calculator will show that if you type the new loan by itself and resist comparing its interest line to the old plan without also comparing the month count.

Questions to answer before you move the balance

• What is the fee in dollars, and is it added to the balance you will pay interest on later?
• What APR applies the month after the promo, and what balance will still be there if you pay only what you can actually pay?
• Will the new minimum be lower, and will you volunteer the old payment anyway?
• Does the new account charge a penalty APR or demand the whole balance if a payment is late?
• Are you still revolving other debts at a higher rate that should get the extra dollars first?

Related: how a higher payment changes interest when the debts stay put, and which APR on the statement is the one to type.