Michigan Auto Loan Calculator (with Michigan Sales Tax & Fees)

Michigan taxes vehicle purchases at the state's standard 6% sales tax rate, which applies to both dealer and, in most cases, private-party transactions processed through the Secretary of State. That flat 6% is simpler than some neighboring states' tiered systems, but Michigan makes up for it with one of the more unusual vehicle registration structures in the country: rather than a flat annual fee, Michigan calculates most passenger vehicle registration (plate) fees based on the car's original list price or weight, meaning a new luxury SUV and a ten-year-old economy sedan pay very different annual registration amounts even in the same state.

This calculator applies Michigan's 6% sales tax to the full vehicle price, adds a flat $350 estimate to cover title work, registration, and dealer documentation, and finances the remainder over the buyer's chosen term. Because Michigan's actual ad valorem registration fee schedule does not reduce to a single flat number the way a title fee does, the $350 figure here should be read as a rough placeholder rather than an exact quote, particularly for higher-value vehicles where the registration tab fee can run well above $350 in the first few years of ownership.

One detail specific to Michigan that shoppers should know: the state has been phasing in a trade-in sales tax credit over several years, gradually raising the amount of trade-in value that can be excluded from the taxable purchase price. That phase-in changes the effective tax bill for anyone trading in a vehicle, and it is a detail this calculator does not attempt to model, since it depends on the specific trade-in value and the phase-in cap in effect at the time of purchase.

1. Sales tax on the vehicle price. Michigan's 6% rate is applied to the full purchase price: salesTax = vehiclePrice × 0.06.
2. Total vehicle cost. The price, the sales tax, and a flat $350 title/registration/documentation estimate are added together.
3. Amount financed. The down payment (and any trade-in value entered as part of it) is subtracted from the total vehicle cost.
4. Amortization. The financed balance is amortized monthly at the entered APR over the chosen term using the standard fixed-payment formula:

$$M = P \times \frac{r(1+r)^n}{(1+r)^n - 1}$$

where $P$ is the financed amount, $r$ is the monthly interest rate, and $n$ is the term in months.

Using the calculator's default inputs:

• Vehicle price: $35,000.00
• Down payment / trade-in: $5,000.00
• Loan term: 60 months
• APR: 7.25%

Step 1: Sales tax. $35,000.00 × 6% = $2,100.00.

Step 2: Total vehicle cost. $35,000.00 + $2,100.00 (tax) + $350.00 (title, registration, and doc fees) = $37,450.00.

Step 3: Amount financed. $37,450.00 minus $5,000.00 down = $32,450.00.

Step 4: Amortization at 7.25% APR over 60 months. The monthly rate is 7.25% ÷ 12 = 0.6041667%. Financing $32,450.00 at that rate over 60 months produces a monthly payment of approximately $646.38, with total interest of roughly $6,333 over the loan's life.

• The Michigan trade-in sales tax credit. Michigan has been phasing in a growing exemption for trade-in value against the taxable purchase price, with the exempt amount increasing incrementally each year until reaching a full credit. This calculator applies the 6% rate to the entire vehicle price and does not net out any trade-in credit, so buyers with a trade-in may owe less tax than shown here.
• Ad valorem registration (plate) fees. Michigan's actual passenger vehicle registration fee is based on the vehicle's list price or weight class rather than a flat charge, so the true first-year registration cost can be higher or lower than the portion of the $350 estimate allotted to it.
• Lender fees and add-on products. GAP insurance, extended service contracts, and bank origination fees are not part of the flat fee estimate used here.
• Credit-based APR variation. The rate a buyer actually qualifies for depends on credit history, the lender, and the loan-to-value ratio, none of which this calculator adjusts for.
• County or local surcharges. Michigan vehicle sales tax and registration are state-administered, but this calculator does not account for any dealer-specific administrative fees beyond the flat estimate.

• Assuming the trade-in tax credit is fully in effect. Michigan's trade-in sales tax exemption has been phased in gradually; the credit available in a given year may be capped below the full trade-in value, so it is worth confirming the current exemption cap with the Secretary of State or dealer before assuming a large tax reduction.
• Underestimating registration costs on newer or higher-value vehicles. Because Michigan bases plate fees on the vehicle's value rather than a flat rate, buyers of new or expensive vehicles often find their actual first-year registration cost exceeds generic flat-fee estimates like the $350 used here.
• Confusing sales tax with use tax. Michigan applies a 6% use tax to vehicles purchased out of state and brought into Michigan for titling, which functions similarly to the sales tax but is a separate legal category worth confirming if buying across state lines.
• Stretching the loan term to shrink the payment. A 72 or 84-month term lowers the monthly payment shown by the calculator's scenario toggles but increases total interest paid, and can also leave the buyer owing more than the car is worth for longer.
• Not re-checking the tax math after negotiating the price. Since Michigan tax is calculated on the final agreed purchase price, any negotiated discount changes the tax bill along with it, and the calculator's output should be re-run with the actual negotiated price.

• Michigan Department of Treasury: Sales and Use Tax on Motor Vehicles guidance.
• Michigan Secretary of State: Vehicle registration (plate) fee schedules and title fee guidance.
• Michigan Legislature: Trade-in sales tax credit phase-in statute (MCL 205.51 et seq.).
• Consumer Financial Protection Bureau (CFPB): Regulation Z (Truth in Lending Act) disclosure requirements for auto financing.
• Tax Foundation: State Sales Tax Rates, 2025/2026 edition.