How the tax is applied
Tax is charged on the vehicle price at the rate where the car is registered. If it is financed, it joins the balance and attracts interest for the whole term.
Paying it upfront keeps the loan smaller and the total interest lower, but requires more cash at the start.
Worked example
A £28,000 car at 7.5% sales tax carries £2,100 of tax, so the price including tax is £30,100. With a £4,000 deposit and the tax financed, £26,100 is borrowed.
At 7.9% over 60 months the payment is £527.97, the interest is £5,577.94 and the total cost including the deposit is £35,677.94.
Check the local rules
Some states deduct a trade-in before charging tax, and some charge different rates above a price threshold. Use the rate on your paperwork.
If the sale is exempt, enter 0 and keep the exemption certificate with your records.
Inputs for the auto loan with taxes calculator
Vehicle price before tax
The dealer price of the car, before sales tax.
Sales tax or VAT rate
The rate where you register the car.
Deposit or down payment
Cash or trade-in value paid upfront.
Interest rate (nominal, not APR)
The yearly rate before monthly compounding.
Term
How many months you will take to repay the loan.
How the tax is paid
Financing adds it to the balance; paying upfront keeps it out of the loan.
CALCULATOR QUESTIONS
Auto loan calculator with taxes questions
How much tax is charged on a £28,000 car at 7.5%?
£2,100, making the price including tax £30,100.
Should I finance the tax?
Only if paying it upfront would leave you short. Financing it adds interest for the whole term.
Does a trade-in reduce the tax?
In some states, yes. This calculator applies the rate to the full price, so adjust the price if your state deducts the trade-in.
Are registration fees taxed too?
Rules vary. Registration and title fees are usually separate from sales tax.