What is Colorado's state car sales tax rate?

Colorado charges a 2.9 percent state sales tax on motor-vehicle purchases. Counties, cities, and special districts add their own rates on top, so the combined rate you actually pay is usually between 4 and 9 percent depending on where you live.

Does a trade-in reduce the tax?

Yes. In Colorado the value of a vehicle you trade in to a licensed dealer is deducted from the purchase price before tax is calculated. A 30,000 dollar car with a 10,000 dollar trade-in is taxed on 20,000 dollars.

Is tax based on where I live or where I buy?

Colorado vehicle sales tax is generally based on the buyer's home address, not the dealership location. You pay tax at the rate for the jurisdiction where the car will be registered, collected at the DMV.

Do private-party sales get taxed?

Yes. Even when you buy from a private seller rather than a dealer, you pay the same state and local sales tax when you register the vehicle at the DMV. Private-party sales generally do not qualify for a trade-in deduction.

What combined rate should I enter?

Enter only the local portion (county plus city plus special districts) — the tool already adds the 2.9 percent state rate. Look up your address on the Colorado Department of Revenue rate lookup if you are unsure.

Colorado Car Sales Tax Calculator

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Buying a car in Colorado means paying a 2.9% state sales tax plus whatever your county, city, and special districts charge. This calculator applies both to the net price after trade-in so you know the tax bill before you reach the DMV.

How it works

The taxable amount is the purchase price minus any dealer trade-in allowance. Both the state and local rates apply to that net figure:

taxable    = purchase price − trade-in allowance
state tax  = taxable × 2.9%
local tax  = taxable × (county + city + district rate)
total tax  = state tax + local tax

Example

A $30,000 car with a $10,000 trade-in is taxed on $20,000. At a 3.5% local rate the state tax is 20000 × 0.029 = $580 and local tax is 20000 × 0.035 = $700, for $1,280 total.

Notes

The combined rate varies widely across Colorado — some special districts (like RTD in the Denver metro) add their own percentage. Colorado bases the tax on the buyer’s registration address, and trade-in deductions generally apply only to dealer transactions, not private-party purchases.