Meta Description: A no-BS breakdown of how Oregon property tax assessments work, why your value might’ve jumped, and what to do before the December 31 appeal deadline.

TL;DR (because who’s got time)

Your property tax assessment shows what the county thinks your home is worth — not your actual tax bill.

If that number feels off, you can appeal it — just make sure you do it by December 31.

Grab the form from your county assessor’s office and double-check your property info before filing.

Every fall, that familiar envelope shows up in Oregon mailboxes — the one from the county assessor that makes your stomach drop for a sec.

If your property value looks higher this year, you’re not imagining things. Here’s what’s actually going on and what to do if the numbers don’t add up.

Assessment ≠ Tax Bill

Your assessment notice isn’t your tax bill.

It’s just the county’s opinion of your property’s value.

Here’s how it breaks down:

• The assessed value is what the county uses to calculate your taxes.
• The tax bill is what you actually owe, based on that value and the local voter-approved rates.

So even if your assessment went up, your tax bill might not rise by the same amount.

Why Your Value Changes

Values shift because the market shifts — or because something about your property did.

If home prices in your neighborhood climbed, or if you remodeled, added a deck, or built that dream kitchen, your assessment will probably follow.

Thanks to Oregon’s Measure 50, your Maximum Assessed Value (MAV) can only increase about 3% a year — unless there’s major construction or a land split.

Check Your Notice Before Freaking Out

Before assuming the county has lost its mind, take five minutes to double-check your details.

✅ Property info: square footage, lot size, bedrooms, bathrooms — all accurate?
✅ Comparable homes: what are similar properties nearby valued at?
✅ Obvious mistakes: basement listed that doesn’t exist? Old shed still showing? It happens.

If you find a clear error, call your county assessor’s office. Most will fix factual mistakes without a full appeal.

Still Think the Values’ Too High?

If everything looks correct, but that number still feels inflated, you can file an appeal.

You’re challenging the value, not the tax amount — and you’ll need evidence that your home’s real market value is lower than what the county shows.

It’s not complicated, but the deadline is non-negotiable.

Deadlines & Links by County

Multnomah County

• File or postmark by December 31
  
• Fee: $30 per account
  
• Details: Multnomah County Property Value Appeals
  

Clackamas County

• Petitions due or postmarked by December 31
  
• Include five copies of your petition and evidence
• Info: Clackamas County Property Value Appeals Board (PVAB)
  

Washington County

• Deadline: December 31
  
• Call 503-846-3854 or request a form online
• Details: Washington County Property Value Appeals
  

If your appeal gets denied, you can take it to the Oregon Tax Court, Magistrate Division, within 30 days of that decision.

Key Dates to Remember

📅 October: Tax statements hit mailboxes
📅 December 31: Last day to file or postmark an appeal
📅 30 Days After Decision: Deadline to appeal to the Tax Court, Magistrate Division

Helpful Links

🔗 Oregon Dept. of Revenue – How to Appeal Your Property Value (PDF)
🔗 Oregon Tax Court – Magistrate Division
🔗 Oregon Constitution – Measure 50 (Article XI, Section 11)

The Bottom Line

If your assessment looks off, don’t panic — and definitely don’t toss the notice in a drawer.

Look it over, get your facts straight, and reach out to your county assessor’s office if you need to talk through next steps.

And if you want a little help understanding your notice or finding a good local appraiser, I can connect you with the right people.

Disclaimer

This info’s meant to keep you informed, not to replace advice from your county, a licensed appraiser, or an attorney familiar with Oregon property tax law. Always verify details before filing an appeal.