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

A Texas county tax assessor-collector, not a retailer at checkout, is who actually collects the tax on a car purchase here. Texas carves vehicles out of its general sales tax statute entirely and instead charges a dedicated 6.25% Motor Vehicle Sales and Use Tax, due at the county office when the title transfers. Unlike Texas's general retail sales tax, which lets cities, counties, and special districts add up to 2% in local tax on top of the state rate, the vehicle tax is a flat statewide 6.25% with no local add-on at all.

Texas also charges no individual income tax, putting it alongside Tennessee and South Dakota in this comparison set, a structural trade-off that leans the state's revenue mix more heavily toward property tax instead. That has no bearing on vehicle purchase tax, which stays a straightforward 6.25% regardless of where in the state the sale happens.

This calculator applies that 6.25% rate to the vehicle price, adds a flat estimate for title and registration fees, and finances what remains after the down payment across the chosen term.

1. Motor vehicle tax calculation. Vehicle price is multiplied by Texas's 6.25% Motor Vehicle Sales and Use Tax rate.
2. Fee addition. A flat $350 covers title transfer, registration, and standard dealer documentation costs.
3. Financed amount. Vehicle price plus tax plus fees, minus the down payment, produces the amount financed.
4. Amortization. The financed amount is amortized over the loan term using:

$$\text{Payment} = P \times \frac{i(1+i)^n}{(1+i)^n - 1}$$

where $P$ is the financed principal, $i$ is the monthly interest rate (APR ÷ 12), and $n$ is the loan term in months.

Using the calculator's default inputs:

• Vehicle Price: $35,000.00
• Down Payment: $5,000.00
• Loan Term: 60 months
• APR: 7.25%

Step by step:

1. Texas Motor Vehicle Sales and Use Tax: $35,000 × 6.25% = $2,187.50
2. Title, registration, and doc fees: $350.00
3. Total vehicle cost before financing: $35,000 + $2,187.50 + $350 = $37,537.50
4. Financed amount: $37,537.50 − $5,000 down = $32,537.50
5. Monthly rate: 7.25% ÷ 12 = 0.0060417
6. Monthly payment on $32,537.50 over 60 months at that rate comes to approximately $648.13
7. Total interest paid over the 60-month term is approximately $6,350, bringing total out-of-pocket cost (down payment plus all payments) to roughly $43,888

• The $90 minimum tax rule. Texas imposes a minimum Motor Vehicle Sales and Use Tax of $90 on vehicles gifted or sold between qualifying family members, and a $10 gift tax for qualifying transfers, neither of which is relevant to a standard financed purchase but is worth knowing if your transaction involves a private, non-arm's-length transfer.
• Trade-in tax credit. Texas reduces the taxable amount by the value of a trade-in vehicle when both transactions occur through a licensed dealer; this calculator treats trade-in value only as part of the down payment, not as a reduction to the taxable base, so your actual tax bill may be lower than shown.
• The 30-day payment deadline. Texas requires the Motor Vehicle Sales and Use Tax to be paid to the county tax assessor-collector within 30 calendar days of purchase, with penalties for late payment; this calculator assumes the tax is financed as part of the loan at closing.
• County-level registration fee variation. While the vehicle tax rate is uniform statewide, annual registration fees and optional county fees vary by Texas county and are not part of this one-time purchase calculation.
• Lender add-ons. GAP insurance, extended service contracts, and other financed add-on products are not included in the financed amount.
• Credit-tier APR variation. The rate you actually qualify for depends on your credit profile and lender, independent of anything modeled here.

• Confusing the Motor Vehicle Sales and Use Tax with general sales tax. Texas's 6.25% vehicle tax does not carry the additional local sales tax add-ons (up to 2% more) that apply to most other retail purchases in the state, so vehicle tax estimates should not use the higher combined retail rate.
• Missing the 30-day payment window on a private-party purchase. Buying from a private seller rather than a dealer shifts the responsibility for paying the tax directly to the buyer at the county tax office, with penalties for missing the 30-day deadline.
• Not applying the trade-in tax credit correctly. Texas buyers trading in a vehicle at a dealership should confirm the tax is calculated on the price net of trade-in value, which can meaningfully lower the amount owed versus a naive purchase-price calculation.
• Choosing a longer term purely to lower the payment. Extending to 72 or 84 months reduces the monthly figure but increases total interest paid substantially over the life of the loan.
• Overlooking that Texas has no income tax cushion built into this calculator. The absence of state income tax improves real affordability, but this calculator only computes the loan payment itself, not take-home pay.

• Texas Comptroller of Public Accounts: Motor Vehicle Sales and Use Tax guidance and county tax office procedures.
• Texas Department of Motor Vehicles: Title transfer and registration fee schedules.
• Consumer Financial Protection Bureau: Auto loan shopping and APR disclosure guidance.
• Federal Trade Commission: Vehicle financing and add-on product disclosures.