Auto Payment Tax Calculator
Auto Loan Calculator with Sales Tax works out Payment and Total interest from Vehicle price, Cash down payment and Trade-in value. The default figures on this page give payment of 643.22; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Taxable amount = price minus trade-in = 35000
- Sales tax at 6% = 2100
- Amount financed = price 35000 + tax 2100 + fees 0 - rebate 0 - down 5000 - trade equity 0 = 32100
- Payment on 32100 at 7.5% = 643.22
Amortisation scheduletable
| period | payment | interest | principal | balance |
|---|---|---|---|---|
| 1 | 643.22 | 200.63 | 442.59 | 31,657.41 |
| 2 | 643.22 | 197.86 | 445.36 | 31,212.05 |
| 3 | 643.22 | 195.08 | 448.14 | 30,763.91 |
| 4 | 643.22 | 192.27 | 450.95 | 30,312.96 |
| 5 | 643.22 | 189.46 | 453.76 | 29,859.2 |
| 6 | 643.22 | 186.62 | 456.6 | 29,402.6 |
| 7 | 643.22 | 183.77 | 459.45 | 28,943.15 |
| 8 | 643.22 | 180.89 | 462.33 | 28,480.82 |
| 9 | 643.22 | 178.01 | 465.21 | 28,015.61 |
| 10 | 643.22 | 175.1 | 468.12 | 27,547.49 |
| 11 | 643.22 | 172.17 | 471.05 | 27,076.44 |
| 12 | 643.22 | 169.23 | 473.99 | 26,602.45 |
| 13 | 643.22 | 166.27 | 476.95 | 26,125.5 |
| 14 | 643.22 | 163.28 | 479.94 | 25,645.56 |
| 15 | 643.22 | 160.28 | 482.94 | 25,162.62 |
| 16 | 643.22 | 157.27 | 485.95 | 24,676.67 |
| 17 | 643.22 | 154.23 | 488.99 | 24,187.68 |
| 18 | 643.22 | 151.17 | 492.05 | 23,695.63 |
| 19 | 643.22 | 148.1 | 495.12 | 23,200.51 |
| 20 | 643.22 | 145 | 498.22 | 22,702.29 |
| 21 | 643.22 | 141.89 | 501.33 | 22,200.96 |
| 22 | 643.22 | 138.76 | 504.46 | 21,696.5 |
| 23 | 643.22 | 135.6 | 507.62 | 21,188.88 |
| 24 | 643.22 | 132.43 | 510.79 | 20,678.09 |
| 25 | 643.22 | 129.24 | 513.98 | 20,164.11 |
| 26 | 643.22 | 126.03 | 517.19 | 19,646.92 |
| 27 | 643.22 | 122.79 | 520.43 | 19,126.49 |
| 28 | 643.22 | 119.54 | 523.68 | 18,602.81 |
| 29 | 643.22 | 116.27 | 526.95 | 18,075.86 |
| 30 | 643.22 | 112.97 | 530.25 | 17,545.61 |
| 31 | 643.22 | 109.66 | 533.56 | 17,012.05 |
| 32 | 643.22 | 106.33 | 536.89 | 16,475.16 |
| 33 | 643.22 | 102.97 | 540.25 | 15,934.91 |
| 34 | 643.22 | 99.59 | 543.63 | 15,391.28 |
| 35 | 643.22 | 96.2 | 547.02 | 14,844.26 |
| 36 | 643.22 | 92.78 | 550.44 | 14,293.82 |
| 37 | 643.22 | 89.34 | 553.88 | 13,739.94 |
| 38 | 643.22 | 85.87 | 557.35 | 13,182.59 |
| 39 | 643.22 | 82.39 | 560.83 | 12,621.76 |
| 40 | 643.22 | 78.89 | 564.33 | 12,057.43 |
| 41 | 643.22 | 75.36 | 567.86 | 11,489.57 |
| 42 | 643.22 | 71.81 | 571.41 | 10,918.16 |
| 43 | 643.22 | 68.24 | 574.98 | 10,343.18 |
| 44 | 643.22 | 64.64 | 578.58 | 9,764.6 |
| 45 | 643.22 | 61.03 | 582.19 | 9,182.41 |
| 46 | 643.22 | 57.39 | 585.83 | 8,596.58 |
| 47 | 643.22 | 53.73 | 589.49 | 8,007.09 |
| 48 | 643.22 | 50.04 | 593.18 | 7,413.91 |
| 49 | 643.22 | 46.34 | 596.88 | 6,817.03 |
| 50 | 643.22 | 42.61 | 600.61 | 6,216.42 |
| 51 | 643.22 | 38.85 | 604.37 | 5,612.05 |
| 52 | 643.22 | 35.08 | 608.14 | 5,003.91 |
| 53 | 643.22 | 31.27 | 611.95 | 4,391.96 |
| 54 | 643.22 | 27.45 | 615.77 | 3,776.19 |
| 55 | 643.22 | 23.6 | 619.62 | 3,156.57 |
| 56 | 643.22 | 19.73 | 623.49 | 2,533.08 |
| 57 | 643.22 | 15.83 | 627.39 | 1,905.69 |
| 58 | 643.22 | 11.91 | 631.31 | 1,274.38 |
| 59 | 643.22 | 7.96 | 635.26 | 639.12 |
| 60 | 643.11 | 3.99 | 639.12 | 0 |
Yearly summarytable
| year | interest | principal | endingBalance |
|---|---|---|---|
| 1 | 2,221.09 | 5,497.55 | 26,602.45 |
| 2 | 1,794.28 | 5,924.36 | 20,678.09 |
| 3 | 1,334.37 | 6,384.27 | 14,293.82 |
| 4 | 838.73 | 6,879.91 | 7,413.91 |
| 5 | 304.62 | 7,413.91 | 0 |
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
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What the Auto Loan Calculator with Sales Tax calculates
Works out a vehicle loan payment from the price, down payment, trade-in, sales tax and fees, and shows the full cost of the financing.
How to use this Auto Loan Calculator with Sales Tax
Enter Vehicle price, Cash down payment, Trade-in value and Balance still owed on the trade-in. Payment updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Payment, Total interest and Total of payments.
The method follows Standard annuity-immediate payment formula, PMT = P i / (1 - (1+i)^-n), 12 CFR Part 1026 (Regulation Z), Appendix J - Annual Percentage Rate Computations and Trade-in sales tax credit varies by state; most states tax price minus trade-in.
What you can compare
Change one input at a time to see how it affects Payment, Total interest and Total of payments. The inputs you can vary are Vehicle price, Cash down payment, Trade-in value, Balance still owed on the trade-in, Sales tax rate and Trade-in reduces the taxable amount.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
Is sales tax included in an auto loan?
Works out a vehicle loan payment from the price, down payment, trade-in, sales tax and fees, and shows the full cost of the financing. On the figures this page opens with — vehicle price 35,000, cash down payment 5,000 and annual interest rate 7.5% — the payment is 643.22. Put your own figures in their place and the working updates beside the result.
What is the 20% rule when buying a car?
On the figures this page opens with — vehicle price 35,000, cash down payment 5,000, annual interest rate 7.5% and loan term 5 years — the payment is 643.22. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
How to calculate interest on a car loan with taxes?
Works out a vehicle loan payment from the price, down payment, trade-in, sales tax and fees, and shows the full cost of the financing. Open “How this is worked out” beside the result to see each step for your own figures.
Is there a tax deduction for auto loan interest in 2026?
It needs Vehicle price, Cash down payment, Trade-in value, Balance still owed on the trade-in, Sales tax rate and Trade-in reduces the taxable amount. Nothing else is required, and the figures stay in your browser.
What information do I need for the Auto Loan Calculator with Sales Tax?
You need Vehicle price, Cash down payment, Trade-in value, Balance still owed on the trade-in, Sales tax rate, Trade-in reduces the taxable amount, Title, registration and dealer fees and Manufacturer rebate. The page opens with default figures that give payment of 643.22, so you can see the scale before entering your own.
What does this Auto Loan Calculator with Sales Tax show?
It shows Payment, Total interest, Total of payments, Number of payments, Payoff time, Rate per period, Interest per unit borrowed and Interest saved by extra payments, with the working and any warnings for your entries.