Washington vs Idaho: Vehicle Registration Cost Comparison
Comparing what the same vehicles cost to register each year in Washington versus Idaho, computed from both states' current official fee schedules:
| Scenario | Washington | Idaho |
|---|---|---|
| New $45k gas SUV | $82.00/yr | $77.00/yr |
| 3-yr-old $35k gas car | $82.00/yr | $65.00/yr |
| New $55k EV | $307.00/yr | $217.00/yr |
| 10-yr-old $8k car | $82.00/yr | $53.00/yr |
For most vehicles, Idaho is the cheaper state to register in — though the gap varies a lot by vehicle value and age. Keep in mind annual registration is only part of the picture: sales/excise taxes at purchase, insurance, and local property taxes on vehicles can outweigh the registration difference.
Washington in short
Washington tab fees stack a $30 base license fee, a weight fee that jumped about 40% in January 2026 ($35 for cars up to 4,000 lbs, $96 above 8,000), and filing/service fees — plus, if you live in King, Pierce, or Snohomish county inside the Sound Transit district, an RTA excise tax of 1.1% of your vehicle's depreciated MSRP that often exceeds everything else combined. EVs pay $225 in additional fees and hybrids $75.
Idaho in short
Idaho registration is simple and age-based: $69 per year for vehicles 1–2 years old, $57 for years 3–6, and $45 from year 7 on, plus county administrative fees of $3–$14. EVs add $140 and plug-in hybrids $75.
All figures computed from official fee schedules — sources: https://dol.wa.gov/vehicles-and-boats/vehicles/vehicle-registration/calculate-vehicle-tab-fees · https://app.leg.wa.gov/rcw/default.aspx?cite=46.17.365 — last reviewed 2026-07-16.