Transparent method
The formula
Worked example
Example inputs
How to interpret the result
The affordable amount financed from a payment, rate and term answers a narrower question than total drive-away cost, because tax, title, registration and add-on fees sit on top of the financed amount and still have to be paid, either upfront or folded into a larger loan than the ceiling this calculation shows.
Before you rely on it
What to check
Add expected tax, title and fee costs on top of the calculated financing ceiling before treating that number as the full vehicle budget.
The common error
Where people go wrong with auto affordability calculator
Treating the calculated affordable-amount-financed figure as the total vehicle price budget. Taxes, title and fees add real cost on top of that ceiling that still has to come from somewhere.
Sensitivity evidence
How annual interest rate changes the affordable loan amount
| Annual interest rate | Affordable loan amount | Total payments |
|---|---|---|
| 5.5% | $26,176 | $30,000 |
| 6.5% | $25,554 | $30,000 |
| 7.5%worked example | $24,953 | $30,000 |
| 8.5% | $24,371 | $30,000 |
| 9.5% | $23,807 | $30,000 |
Every input, tested
Which input moves the affordable loan amount most
| Input | Tested from | To | Affordable loan amount at each end | Swing |
|---|---|---|---|---|
| Loan term | 4.0 years | 6.0 years | $20,679 to $28,918 | $8,239 (33%) |
| Maximum monthly payment | $450 | $550 | $22,457 to $27,448 | $4,991 (20%) |
| Annual interest rate | 6.5% | 8.5% | $25,554 to $24,371 | $1,184 (4.7%) |
Two variables at once
Affordable loan amount by annual interest rate and maximum monthly payment
| Annual interest rate \ Maximum monthly payment | $400 | $500 | $600 |
|---|---|---|---|
| 5.5% | $20,941 | $26,176 | $31,412 |
| 6.5% | $20,443 | $25,554 | $30,665 |
| 7.5% | $19,962 | $24,953 | $29,943 |
| 8.5% | $19,496 | $24,371 | $29,245 |
| 9.5% | $19,046 | $23,807 | $28,569 |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Maximum monthly payment | $500 |
| Annual interest rate | 7.5% |
| Loan term | 5.0 years |
| Affordable loan amount | $24,953 |
| Total payments | $30,000 |
Where the inputs come from
Maximum monthly payment is the amount you can spend on a car payment after your other fixed costs, based on take-home pay and not gross. The rate and term are what you expect to be offered, so use a preapproved rate. The result is the loan amount that payment supports, so add your down payment and trade-in to get a price. Remember that insurance, fuel, maintenance and registration are additional monthly costs.
Using the affordable loan amount in a real decision
If the number seems small, a used car, a larger down payment or a cheaper model closes the gap better than a longer loan.
When the result stops applying
The payment limit is a budget choice, and the calculation ignores taxes, fees and add-ons that reduce the price you can buy. Insurance rates vary by car and can change the total cost sharply. A lender may approve a larger loan than you can comfortably handle. Interest rates depend on credit and vary between lenders.
What to compare it with
Test a specific car on the auto loan calculator, and check the broader rule on the 20/4/10 page. The vehicle total cost of ownership calculator adds running costs, and the loan affordability calculator works for other loans. Compare a shorter term to see how much buying power depends on it.
People also ask
Frequently asked questions
How much car can I afford?
A common rule is to keep the total cost of the car, including loan, insurance and fuel, at about 10% to 15% of your take-home pay.
Should I include insurance in the budget?
Yes. Insurance can add hundreds of dollars a month, especially on newer or higher-performance cars, and lenders require coverage.
Is a longer loan a good way to afford a better car?
It lowers the payment but raises total interest and the risk of owing more than the car is worth, so it is usually better to choose a less expensive car.