Washington Car Sales Tax Calculator
Determine exact Washington motor vehicle sales tax, official DMV title and license fees (TTL), and dealer documentation fee caps under RCW 82.08.020 & RCW 46.70.180(2).
Vehicle & Tax Parameters
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Worked Scenario: Buying a $30,000 Vehicle in Washington
Here is how the numbers break down when purchasing a $30,000 car with a $5,000 trade-in allowance in Washington:
| Line Item | Calculation Rule | Amount ($) |
|---|---|---|
| Vehicle Agreed Price | Base vehicle purchase price | $30,000.00 |
| Less Trade-In Allowance | Deducted from vehicle equity | -$5,000.00 |
| Taxable Purchase Amount | Price minus trade-in (Credit applies) | $25,000.00 |
| Washington Sales Tax (7.00%) | $25,000.00 × 7.00% | $1,750.00 |
| Dealer Documentation Fee | Statutory legal cap of $200 under RCW 46.70.180(2). Dea... | $200.00 |
| DMV Title & Registration | Official state titling and plate fee | $250.00 |
| Total Out-the-Door Due | Net balance + tax + fees | $27,200.00 |
Washington Motor Vehicle Tax Laws & Regulations
When purchasing a car in Washington, understanding how your state assesses tax and regulates dealer fees ensures you never overpay at the dealership signing table. Primary legal authority is codified under RCW 82.08.020 & RCW 46.70.180(2).
1. Sales Tax Assessment & Surtaxes
Under RCW 82.08.020 & RCW 46.70.180(2), Washington levies a 6.5% retail sales tax plus a 0.5% motor vehicle sales tax (7.0% state base). Regional Transit Authority (RTA) areas in Puget Sound add local tax up to 10.5%.
2. Trade-In Tax Deduction Rules
Like-kind trade-in credit permitted under RCW 82.08.010. The agreed value of a trade-in vehicle reduces taxable purchase basis.
3. Dealer Documentation Fees & Ceilings
Statutory legal cap of $200 under RCW 46.70.180(2). Dealers cannot charge more than $200 for documentary service fees. Learn how this compares with other jurisdictions in our complete Dealer Doc Fees by State Directory.
Local DMV & County Fee Variations in Washington
While state tax rates provide the baseline, local county surtaxes and DMV plate fees vary across Washington jurisdictions:
| County / Metropolitan Area | Combined Vehicle Tax Rate | DMV Plate & Title Fee | Typical Dealer Doc Fee |
|---|---|---|---|
| King County (Seattle) | 10.60% (7.0% state + 3.6% local/RTA) | $43.25 base + 1.1% RTA MVET | $200 (Capped) |
| Pierce County (Tacoma) | 10.00% (7.0% state + 3.0% local/RTA) | $43.25 base + 1.1% RTA MVET | $200 (Capped) |
| Snohomish County (Everett) | 10.60% (7.0% state + 3.6% local/RTA) | $43.25 base + 1.1% RTA MVET | $200 (Capped) |
| Spokane County | 9.00% (7.0% state + 2.0% local) | $43.25 base + county weight fee | $200 (Capped) |
| Clark County (Vancouver) | 8.70% (7.0% state + 1.7% local) | $43.25 base + county weight fee | $200 (Capped) |
| Thurston County (Olympia) | 9.50% (7.0% state + 2.5% local) | $43.25 base + county weight fee | $200 (Capped) |
Cross-Border & Private-Party Buying Rules
If you purchase a vehicle from an out-of-state dealership, you pay motor vehicle sales tax to Washington when titling the car in your home jurisdiction. Read our transactional guide on buying a car out of state to avoid paying duplicate sales tax.
For private-party transactions between individual buyers and sellers, review our guide on private party vs. dealer vehicle sales tax to understand state valuation rules and required bill of sale documentation.
Need a National View?
Compare statutory rates across all 50 states or recalculate with custom dealer parameters: