How to Calculate Your Debt Payoff Order on $57,600 in Mixed Debt: A 4-Step Formula for September 2026
Picture someone with $57,600 in debt spread across six accounts. Two credit cards, a personal loan, an auto loan, student loans and a medical bill. They're staring at a spreadsheet that says "pay the highest rate first." Then they hear that mortgage rates are steady and a HELOC might be cheap. A friend mentions a 0% balance transfer. Somebody else says to knock out the smallest balance for momentum.
Everyone has a rule of thumb, and none of the rules use this person's actual numbers. This post walks through a four-step calculation that does. The debts below are a worked example I built for illustration, not real accounts or quotes. Yours will differ, and that's the point.
The example: six debts, one blended rate
Here is the hypothetical picture:
| Debt | Balance | APR | Annual interest |
|---|---|---|---|
| Credit card A | $9,800 | 24.99% | $2,449 |
| Credit card B | $4,200 | 21.49% | $903 |
| Personal loan | $11,500 | 12.90% | $1,484 |
| Auto loan | $18,400 | 7.40% | $1,362 |
| Student loans | $11,200 | 5.50% | $616 |
| Medical bill (payment plan) | $2,500 | 0.00% | $0 |
| Total | $57,600 | 11.83% blended | $6,813 |
That $6,813 works out to about $568 a month in interest before a single dollar of principal moves. Blended APR is the first number to compute for your own situation. Add up (balance × rate) for every debt, then divide by total balance.
Notice what the blended rate hides. Only $14,000 of this pile, the two cards, carries a rate above 20%. Those two accounts are 24% of the balance but 49% of the interest ($3,352 of $6,813). Anything you do about payoff order should start with that gap.
Step 1: Sort by what each dollar costs you
Sorting by APR is the avalanche method. It's the mathematically cheapest order when no other variable interferes. But APR is only step one, because some debts have features that change the answer:
- Medical debt at 0% is usually the last thing to accelerate, unless the provider will report it or send it to collections.
- Student loans may carry protections (income-driven plans, deferment options) that you lose if you refinance them into something else.
- Auto loans are secured by the car, so a missed payment has a physical consequence.
If you want the fuller version of this ranking, we walked through a five-variable version in How to Calculate Which Debt to Pay First on $68,400.
Step 2: Find which debts beat the consolidation rate
This is the step most people skip. A consolidation tool only helps for debts that cost more than the tool does. Assume, for the example only, a variable-rate HELOC at 8.5%. That's an assumption, not a quote, so plug in the rate you're actually offered.
| Debt | APR | Costs more than 8.5%? | Annual rate gap on the balance |
|---|---|---|---|
| Card A | 24.99% | Yes | about $1,616 |
| Card B | 21.49% | Yes | about $546 |
| Personal loan | 12.90% | Yes | about $506 |
| Auto loan | 7.40% | No | costs you about $202 more |
| Student loans | 5.50% | No | costs you about $336 more |
| Medical | 0.00% | No | costs you $213 more |
Three debts, $25,500 in total, sit above the HELOC rate. Moving the auto loan, student loans or medical bill onto a HELOC would raise the rate you pay on them, and it would put your house behind a car loan. Only the top three make sense as candidates.
This is the kind of analysis Kovarino runs for you, so you don't have to build the spreadsheet yourself.
Step 3: Price the three strategies on the same payment
Now compare avalanche, a 0% balance transfer and a HELOC. Keep the monthly payment identical, because otherwise you're comparing strategies and budgets.
Assumptions (all illustrative): the two cards are modeled as one pool of $14,000 at the blended 23.94%. You put $1,000/month toward them. The transfer card charges a 3% fee with an 18-month 0% promo. The HELOC is 8.5% variable with $500 in closing costs. The payoff-time formula is: months = −ln(1 − r × B ÷ P) ÷ ln(1 + r), where r is the monthly rate, B the balance and P the payment.
| Strategy | Months to payoff | Interest + fees | Total cost |
|---|---|---|---|
| Avalanche (cards stay as they are) | about 16.6 | about $2,580 interest | about $2,580 |
| 0% balance transfer (3% fee on $14,000) | about 14.4 | $0 interest + $420 fee | about $420 |
| HELOC at 8.5% (plus $500 costs) | about 14.8 | about $800 interest + $500 | about $1,300 |
On paper the transfer wins, by about $2,160 over avalanche and about $880 over the HELOC. Real avalanche inside two cards is a bit cheaper than my single-pool shortcut, but not by enough to change the ranking.
Now break it, because rankings that can't be broken aren't worth much:
- Shorter promo. At a 12-month promo, about $2,420 is left when the 0% ends. Paying that off at the ordinary card rate adds roughly $90 in interest, so the total is about $510. The transfer still wins.
- Deferred interest instead of true 0%. If the "0%" is really deferred interest and any balance remains at month 12, back-charged interest at 24.99% on the declining balance is roughly $2,100. That's about equal to avalanche, and worse than the HELOC.
- Approval limit. A new card with an $8,000 limit can't absorb $14,420. You'd transfer part and avalanche the rest, and the blended result lands between the rows above.
- Payment drops to $700. The 18-month transfer still finishes (about 20.6 months, with roughly $70 of post-promo interest). Avalanche at $700 balloons to roughly $4,900 in interest over more than 2.5 years. Both figures are my own arithmetic on the example.
Read the fine print on which kind of 0% it is before running this. Details like that are why we built the 7-question decision checklist.
Step 4: Scale it up to everything above the HELOC rate
What if you put the personal loan into the mix, all $25,500 above 8.5%? Modeled the same way at $1,500/month:
- Existing rates (blended about 18.96%): about 20.0 months, about $4,430 in interest.
- HELOC at 8.5%: about 18.2 months, about $1,770 in interest, plus $500 in costs, so about $2,270.
That's roughly $2,160 less. It's a real number, and it comes with something the other options don't have: your home is now collateral for debt that used to be unsecured. If income stops, a defaulted credit card hits your credit report and a defaulted HELOC can put the house at risk. That trade-off doesn't show up in any interest column.
What the September 2026 headlines change (and don't)
Three of the source articles feed directly into this math. I'll flag where I'm reasoning beyond what they say.
Mortgage rates paused. NerdWallet's "Mortgage Rates Today, Friday, September 18: No Change" describes rates taking a breather as bond markets digest the week's Fed news. HELOC rates typically move with the broader rate environment, so a pause is a snapshot, not a lock. The sensitivity is small but real: a 1-point rise in the HELOC rate adds roughly $90 to the $14,000 card scenario and roughly $225 to the $25,500 scenario, and it applies to whatever balance you still carry when it happens. Variable rates are the reason to price the HELOC at 9.5%, not just 8.5%, before you commit.
Prices and paychecks. The Bureau of Labor Statistics' "Major Economic Indicators Latest Numbers" page shows CPI up 0.4% in August 2026, unemployment at 4.1%, payroll employment up 162,000 (preliminary), and average hourly earnings up $0.10 (preliminary). Here's the household angle, with my own arithmetic. On an assumed $4,200 monthly budget, a 0.4% price rise is about $16.80 a month in added costs. A ten-cent hourly raise at 40 hours a week is about $17.33 a month gross, before taxes. Roughly a wash for one month, and it is money that isn't available for your debt payment. Your budget, hours and raise will differ. The point is that the "$1,000/month" in your plan is a number to re-check, not a constant.
The 4.1% unemployment rate matters for a different reason. A HELOC's risk depends on whether your income holds, so this is exactly the moment to think about how stable your household income is before securing debt with your house.
"Free money" for homebuyers. NerdWallet's "Locked Out: Should You Take 'Free Money' to Buy a Home?" says assistance programs can lower upfront costs but come with trade-offs to weigh. That's outside this calculation, so here's my inference: if you're planning to buy, a HELOC isn't an option (you need equity in a home you already own), and how much debt you carry can shape what a lender will approve. Which of the three strategies you pick can change your buying timeline, so run it before you commit.
The behavioral part: where the math gets bent
Two of the other source articles point at the human side of a payoff plan.
Rewards chasing. NerdWallet's "How I Earned 1 Million Points With My Family Cruise Booking" describes earning miles by booking through an airline-branded cruise portal, especially with an airline credit card. If you pay the balance in full each month, that's a reasonable trick. If you're carrying a balance, run the numbers. Say a card earns points worth 2% of spend, and you carry $6,000 of it. That's about $120 in rewards against about $1,499 a year in interest at 24.99% (my example figures). Points don't beat that.
Side income. NerdWallet's "Quiz: What's the Best Way to Make Money?" is about finding a side hustle. Here's what one is worth against this debt. Add $400/month to the card payment ($1,400 instead of $1,000): payoff drops from about 16.6 months to about 11.3 months, and interest falls from about $2,580 to about $1,770. That's about $815 saved and 5.3 months faster, from income you don't have yet. The catch: it only works if you commit the money to the debt instead of spending it.
Refill risk. The most common failure after a balance transfer or HELOC is the cleared cards filling up again. Suppose you put $300/month back on the cards. That's $3,600 in a year, and the plan's savings are gone. If you know that's your pattern, the "most expensive on paper" options, like avalanche with the cards left open but frozen, or a slower snowball for momentum, may be cheaper in practice. Check the trade-off in our $58,000 consolidation framework.
Your numbers will differ
Every figure above comes from a made-up set of balances. Change any one input and the answer can move:
- A card limit too low for a full transfer.
- A promo that's deferred interest instead of true 0%.
- A HELOC you can't get, because you don't own a home or don't have enough equity.
- A personal loan with a prepayment penalty.
- An auto loan at 4% instead of 7.4%, which makes it the last thing you'd touch.
- Student loans where federal protections are worth more than a rate gap.
Same method, different answer. That's why "pay the highest rate first" is a good default and a poor final answer.
Run the four steps on your own debts
- Compute your blended APR and your annual interest.
- Sort by rate, then flag debts with protections or collateral.
- Find every debt whose rate is above the consolidation option you can actually get.
- Price avalanche, transfer and HELOC on the same monthly payment, then stress-test each with a shorter promo, a higher rate and a payment that slips.
If you'd rather not build that in a spreadsheet, you can model this for your specific situation at Kovarino. Enter your balances, rates and payment, and see how each strategy changes your total cost and your payoff date. For a second angle on the same problem, the September 2026 five-debt-type walkthrough uses a different set of balances.
Whatever the numbers say, the goal is the same: see the total cost of each path before you pick one. Kovarino is there when you want the math done.
Sources
- Major Economic Indicators Latest Numbers — Bureau of Labor Statistics
- How I Earned 1 Million Points With My Family Cruise Booking — NerdWallet
- Locked Out: Should You Take ‘Free Money’ to Buy a Home? — NerdWallet
- Quiz: What’s the Best Way to Make Money? — NerdWallet
- Mortgage Rates Today, Friday, September 18: No Change — NerdWallet