Car Loan EMI Calculator

Your monthly car payment covers the interest accrued that month plus a portion of the principal. The payment is level, but the split is not: early payments are mostly interest, and principal reduction accelerates only in the back half of the term. This is why a 72- or 84-month loan leaves so many buyers underwater (owing more than the car is worth) for the first several years.

The math is the standard amortization formula: Payment = P x r x (1+r)^n / ((1+r)^n - 1), with P the amount financed, r the monthly rate (APR divided by 12) and n the number of months. The calculator above uses that formula directly, so its output matches what a lender would quote on the same terms.

A worked example

Finance $30,000 at 7% APR over 60 months and the payment is about $594. You repay roughly $35,640 in total, so interest costs you around $5,640.

Take the same $30,000 out to 72 months and the payment drops to about $512, which is $82 a month easier. But total repayment climbs to roughly $36,840, so you pay about $1,200 more in interest for that relief. Go to 84 months and the gap widens further while the car keeps depreciating underneath you.

The useful rule of thumb: choose the shortest term whose payment you can genuinely absorb, not the longest term that makes the payment look small.

What the payment figure leaves out

The amount financed is rarely just the sticker price. Before you compare payments, make sure the number you are financing includes everything the dealer will add:

• State and local sales tax, which ranges from zero in a handful of states to well over 8% once local rates are layered on.
• Title, registration and plate fees, plus a dealer documentation fee that is capped in some states and effectively unlimited in others.
• Any negative equity rolled over from a trade-in, which is the single fastest way to end up underwater on the new loan.
• Add-ons written into the contract: gap insurance, paint protection, extended service contracts. All of them are negotiable and all of them accrue interest for the life of the loan.

How to get a lower APR

APR is priced almost entirely off your credit tier. The spread between a prime and a subprime borrower on the same car is routinely several percentage points, which on a $30,000 five-year loan can mean thousands of dollars.

Get pre-approved by a bank or credit union before you shop. Dealer financing is sometimes genuinely the best deal, because manufacturer-subsidized rates on slow-moving models can beat any bank. But you can only tell if you have a real offer to compare against. Bring the pre-approval and let the finance office try to beat it.

Watch for payment-focused negotiation. If a salesperson keeps steering the conversation to the monthly figure rather than the out-the-door price, they are usually solving for a longer term or a higher rate rather than a lower price.

Before you sign

• Negotiate the out-the-door price first, financing second, trade-in third. Bundling them lets a concession on one be quietly recovered on another.
• Confirm there is no prepayment penalty and that extra payments are applied to principal.
• Check whether the loan is simple-interest. Almost all US car loans are, which means paying early genuinely saves you money.
• Look at the total-of-payments box on the contract. That single number is the honest price of the car.