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Calculator US6 ยท When Rates Go Up. The American Debt Handbook

Keep your car, or trade it in for a new one?

Five years of both paths: depreciation, repairs, insurance, loan interest, and what the new car payment could do to your debt instead. If you owe more than the car is worth, that's counted too.

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Cover of When Rates Go Up. The American Debt Handbook

This calculator goes with When Rates Go Up. The American Debt Handbook by JP O'Connor. The book explains what the numbers mean and what to do next.

The car you own

$
$
%
$
$

The new car

$
%
mths
%
$
$

Your most expensive debt

$
%
yrs

Why the pitch sounds right

Every line of it is true. A new car has a warranty. Repair bills on an older car are real, and they arrive without warning. The conclusion is still usually wrong, because of what the pitch counts and what it leaves out.

What it leaves out

It counts repair bills. It doesn't count depreciation, because depreciation never sends a bill. A new car commonly loses more value in its first few years than an older car costs in repairs over five. No warranty covers that.

It also turns the monthly payment into background noise. In the second quarter of 2026 the average new-car loan in the US was about $43,600, over roughly 70 months, at about $765 a month, according to Experian. The green box shows what that payment could do to a debt instead.

Negative equity

Owing more on a car than it's worth is common. Edmunds found about three in ten trade-ins toward a new car in mid-2026 were underwater, by close to $6,900 on average. Rolling that into a new loan means paying interest on a car you no longer own.

When trading in can make sense

If your car is genuinely unsafe or about to need a major repair, put that cost in the repairs box and run it again. If your job depends on a car that starts every morning, that counts too. The point is to see all the costs before you sign.

Check this one. The yearly loss in value is the assumption the answer depends on most. Look up what the same make, model and age sold for a year ago and what it sells for now. Loan rates depend heavily on your credit. Use the APR on the lender's written offer, and ask for the out-the-door price with every tax and fee included.

Get the full handbook

Cover of When Rates Go Up. The American Debt Handbook

United States · 150 pages · JP O'Connor

When Rates Go Up.

The American Debt Handbook

Your fixed mortgage didn't change. Your credit cards, HELOC and ARM did.

  • Why paying the minimum on a $7,500 card can take nearly 20 years
  • Avalanche or snowball: see exactly what the easier path costs
  • The HELOC payment shock when the draw period ends, and how to shrink it now
  • What to say when you call your card issuer to ask for a lower APR

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