Debt consolidation: the math that decides if it saves you money

Debt consolidation saves money only when the total cost of the new arrangement is lower than the total cost of keeping your current debts. Total cost means every payment you will make plus every fee, minus the amount you actually borrowed. A lower interest rate or a lower monthly payment does not prove a saving on its own: a longer term can make a cheaper rate more expensive overall, fees can eat the difference, and freed-up cards can fill up again. This guide shows the calculation step by step, with three example households, a break-even formula and the free help available in several countries.

All amounts below are examples in neutral currency units; use your own currency. Nothing here is a lender recommendation or credit advice.

What debt consolidation actually is

Consolidation replaces several debts with one new one. The US Consumer Financial Protection Bureau (CFPB) describes three common forms: a balance transfer to a credit card with a promotional rate, a debt consolidation loan from a bank, credit union or other lender, and a home equity loan secured on your property (CFPB). Product names, availability and rules differ by country.

The debt does not shrink when it moves. Rate, fees and term decide whether you come out ahead.

The one number every offer has to beat

Start with what happens if you change nothing.

Household A (example): three credit cards with 3,000 units each, at 22%, 24% and 26% a year. The household pays 360 units a month in total, 120 per card, with no new spending.

Modelled month by month (rate ÷ 12, payment at month end), the last card is paid off after 37 months, about three years. Total interest: about 3,618 units. That is the number every consolidation offer has to beat.

For a sense of scale only: in the US, the Federal Reserve reported an average rate of 22.15% on credit card accounts that were charged interest, and 11.86% on 24-month personal loans at commercial banks, for the second quarter of 2026 (Federal Reserve G.19, released 8 September 2026). Rates elsewhere, and the rate you are personally offered, can be very different.

The total-cost formula

Total cost = sum of all payments + all fees not already included in the payments − amount borrowed (or debt paid off)

A fee added to the loan is already inside the payments. A fee deducted from the payout means borrowing more to clear the same debt. Either way, compare the result with the cost of doing nothing.

Guess first: same rate, two terms

Household A is offered a loan for the full 9,000 units at 12% a year, with a 300-unit arrangement fee added to the loan (9,300 borrowed in total). The household can choose the term.

Example calculation: annuity payment P = B × r ÷ (1 − (1 + r)^−n), with B = 9,300, r = 0.12 ÷ 12, n = months. Totals use unrounded payments. Lender rounding and final payments can differ.

The 84-month option has the same rate and the same fee as the 36-month option. It halves the monthly payment and is still the most expensive line in the table. The CFPB makes the same point: a lower monthly payment “may be because you’re paying over a longer time”, which could mean you “pay a lot more overall” (CFPB).

A practical variation: take the 36-month loan but keep paying the old 360 a month. In this model, the loan is repaid in 31 months with about 1,513 units of interest; with the 300 fee, total cost is about 1,813.

For more on how term and payment interact, see borrowing costs: rate, fees, and time belong together.

The break-even test for fees

Fees are where many offers lose their advantage. A quick test:

Break-even (months) ≈ upfront costs ÷ interest saved in the first month

For Household A, the cards cost about 180 units of interest in month one (3,000 × (0.22 + 0.24 + 0.26) ÷ 12). The new loan costs about 93 (9,300 × 0.12 ÷ 12). That is 87 saved per month, so the 300 fee is earned back in about 3.5 months (300 ÷ 87).

This is a rule of thumb, because the monthly saving changes as balances fall. If break-even sits near the end of the term, or never arrives, the offer is not a saving.

Upfront costs can include arrangement or origination fees, balance transfer fees, and the cost of closing existing loans early. That last one varies by country. In Germany, for example, the compensation a lender can demand when a fixed-rate general consumer loan is repaid early is capped at 1% of the amount repaid, or 0.5% if no more than a year of the term is left, and never more than the interest that would have been paid (§ 502 BGB). Mortgages follow different rules. Elsewhere, ask the existing lender for the early-repayment figure in writing.

Also check whether the offered rate is fixed. The CFPB warns that some low consolidation rates are “teaser rates” that rise later (CFPB).

Our consolidation break-even calculator lets you enter your own debts and an offer and shows the total cost of both paths.

Balance transfer or consolidation loan?

Household B (example): 4,000 units on one card at 24%, paying 280 a month. With no change, it takes 17 months and about 758 units of interest.

The household moves the balance to a card with 0% for 15 months and a 3% transfer fee (120 units; the fee level is an assumption for this example). At the same 280 a month, the balance of 4,120 is cleared within the 15 months. Total cost: the 120 fee, about 638 less than staying put.

The catch is the clock. At only 150 a month, 1,870 would remain when the promotion ends; at an assumed follow-up rate of 24%, total cost rises to about 423 over 30 months. Still cheaper than staying put in this example, but far from “zero”.

Rules worth knowing, from the US regulator: a card issuer may charge a balance transfer fee even on a 0% offer (CFPB); the promotional rate lasts a limited time; new purchases on the same card may get no grace period; and in the US, paying more than 60 days late can let the issuer raise the rate on all balances, including the transferred one (CFPB). Card terms in other countries differ.

Countdown rule: (balance + fee) ÷ promotional months = the monthly payment that clears it in time. For Household B: 4,120 ÷ 15 ≈ 275. If you cannot pay that, plan for the rate that follows.

The table compares categories only; no product or provider is ranked.

The freed-up card trap

A new loan empties the old cards. It does not change the budget that filled them.

A US study by the credit bureau TransUnion, covering April 2021 to September 2022, found that credit card debt consolidators cut their card balances by 57% on average after consolidating. Median card utilisation fell from 59% before to 14% right after, then rose back to 42% eighteen months later. Credit scores rose 18 points on average after consolidation; consumers in prime and higher tiers kept that improvement after 18 months, while near-prime and subprime consolidators saw their scores decline over the period (TransUnion, August 2023). These are US averages from one data set, not a prediction for any individual.

The CFPB puts the cause plainly: if debt built up because spending exceeded income, a consolidation loan “probably won’t help you get out of debt unless you reduce your spending or increase your income” (CFPB). That gap is often not carelessness. A car repair, a gap between jobs or a rent increase can do it.

Three protections before you sign:

1. The payment fits. The new monthly payment fits your budget with room to spare, including irregular bills. The cash-flow guide helps with timing.
2. A plan for the freed-up cards. A lower limit, putting them away, or closing them. Closing an account can affect a credit file in some systems, so check how that works where you live.
3. A small buffer. So the next repair has somewhere to go that is not a card.

Household C: when consolidation makes it worse

Household C (example): 6,000 units on cards at 20%, paying 250 a month. No change: about 31 months and 1,726 units of interest.

With a weaker credit file, the offer is 22% over three years, with a 6% fee deducted from the payout. To clear 6,000, the household needs to borrow about 6,383 (6,000 ÷ 0.94). The payment is about 244 a month, slightly lighter than 250. Total cost: about 2,776, roughly 1,050 more than doing nothing.

The CFPB notes that if debt problems have already affected your credit score, you probably won’t get low rates on a balance transfer, consolidation loan or home equity loan (CFPB). In that situation the best next step may be a conversation, not a new loan.

How to compare offers where you live

The rate you are offered depends on your credit file, and credit files work differently by country.

• United States: lenders typically use reports from the three nationwide credit bureaus; free reports are available through AnnualCreditReport.com (CFPB).
• United Kingdom: the three main credit reference agencies are Equifax, Experian and TransUnion; each provides a free statutory report. The data regulator notes that many searches in a short time can suggest financial difficulty and may influence lending decisions (ICO).
• Germany: credit agencies such as SCHUFA must provide a free data copy under Article 15 GDPR (Verbraucherzentrale).
• Elsewhere: look for your country’s credit bureau or public credit register and its free-access rules. Our guide to credit reports and scores explains why scores and lending criteria are not comparable across countries.

A comparison checklist that works in any country:

1. Check your credit file for errors before applying.
2. Write down every current debt: balance, rate, payment, remaining term, early-repayment cost.
3. For each offer, record the rate (fixed or variable), every fee, how fees are charged (added or deducted), and the term.
4. Calculate total cost for each path and the break-even month.
5. Limit formal applications, and read each agreement for promotional end dates, penalty rates and late-payment rules.

Free debt advice comes first if payments already don’t fit

Consolidation is a tool for people who can afford the new payment. If you cannot, free advice is the better first step. Examples by country:

• United States: nonprofit credit counseling organizations can help with a budget, your credit report and sometimes a debt management plan; most are nonprofits but some charge fees, so ask for a written price (CFPB). In a debt management plan you pay the organization monthly and it pays your unsecured creditors, who may agree to lower rates or waive fees; completion often takes 48 months or more (FTC).
• United Kingdom: a Debt Management Plan is an agreement with creditors for unsecured debts only. Some companies charge setup and handling fees, while free debt advice services are also available (GOV.UK).
• Germany: debt counselling (Schuldnerberatung) at municipalities, welfare organisations and consumer advice centres is generally free, though waiting times can be long (Verbraucherzentrale).
• Australia: the National Debt Helpline offers free, confidential, not-for-profit financial counselling on 1800 007 007 (NDH).

You can also ask your current lenders directly. According to the CFPB, some creditors may accept lower payments, waive fees, reduce the rate or move a due date (CFPB).

Warning signs: companies that charge large fees upfront, tell you to stop paying your debts, or push you to secure card debt against your home. The CFPB notes that some firms advertising consolidation are actually debt settlement companies, and the FTC lists the risks of settlement, including credit damage from missed payments and possible lawsuits (CFPB, FTC).

Common mistakes

• Comparing monthly payments instead of total cost. The 84-month example above lowers the payment and raises the cost.
• Ignoring how the fee is charged. A fee deducted from the payout means borrowing more to clear the same debt.
• Forgetting the promotion end date on a balance transfer, or making new purchases on the transfer card.
• Leaving the old cards open with no plan. The TransUnion data show how quickly utilisation can climb back.
• Securing unsecured debt on a home without accepting that the home can be at risk.

Questions people ask

Does debt consolidation hurt your credit score?

It depends on the system and your behaviour afterwards. In the US TransUnion data, scores rose 18 points on average right after consolidation; 18 months later, prime and higher consumers had kept the gain while near-prime and subprime consolidators had seen declines (TransUnion). Applications and searches are recorded differently in each country.

Is a consolidation loan better than paying the cards one by one?

Only if its total cost is lower and you will not refill the cards. Compare it with a structured plan for your current debts, for example highest rate first or smallest balance first, and remember that minimum payments alone can stretch repayment out.

How do I know if a balance transfer is worth it?

Divide balance plus fee by the promotional months. If you can pay that each month, the fee is usually the main cost. If not, add the interest at the follow-up rate. The credit card interest guide explains how card interest is calculated.

Method and limits

The examples use the annual rate divided by twelve, end-of-month payments, no new spending and no other fees. Real card interest is often calculated daily, and real offers depend on your credit file and local rules. The examples illustrate arithmetic; they are not offers, typical rates or advice.