Washington has unique laws for buying a used car from a private seller. This handy guide will lead you through the process.

Step 1 - Gather Documents

Certificate of Title

Complete the Assignment By Registered Owner section. It’s at the bottom of the front of the title.

  • Odometer reading without tenths.
  • Transfer date.
  • Your name, signature, and address.
  • Buyer’s name, signature, and address.

Bill of Sale

State law requires a completed Vehicle/Vessel Bill of Sale form TD-420-065.

When you buy through PrivateAuto, you have access to an electronic form TD-420-065 and other state-specific documents. Complete and sign right in the app.

Step 2 -  Get a Vehicle History Report

A vehicle history report can show you:

  • Maintenance and repair records.
  • Collision repair records.
  • Flood damage.
  • more.

PrivateAuto partner AutoCheck gives you a complete picture of the car’s history. It’s the best value for the money.

Step 3 - Get a Mechanical Inspection

You’re buying the car as-is. In other words, there’s no warranty. You’ll have to pay for any repairs.

You’ll want to make sure there aren’t any hidden mechanical problems.

Find a mechanic you can trust. An ASE Certified mechanic is skilled at inspecting and repairing most cars and light trucks.

Step 4 - Complete the Purchase

After the purchase, you will need to:

  • Apply for a title. You will need to sign in front of a notary public or at a Washington licensing office.
  • Order license plates.
  • Pay fees.


PrivateAuto makes it easy to buy a car in Washington. You get dealer-like services in the palm of your hand.

  • Keeps your info private.
  • Verifies seller identity so you can avoid scams.
  • Inspection and test drive schedulers.

Plus, you get free guides for buying and selling in your state.