Two neighbors on the same Portland street own nearly identical 1920s bungalows. One bought last spring; the other has owned since 2009. Their county tax bills are not close, and it is not a clerical error.
In Oregon, buying a house does not reset what the county taxes. That catches out buyers arriving from states where a sale triggers a fresh assessment, and it changes how you read the seller's tax figure.
Every Oregon property tax account carries two numbers, both set as of January 1 of the assessment year. Real market value is the appraiser's estimate of what the property would sell for. Maximum assessed value is a statutory ceiling with almost nothing to do with the market.
Article XI, section 11 of the Oregon Constitution — the 1997 measure that created this system — started every property at its 1995 real market value reduced by 10 percent, then provided that "for tax years beginning after July 1, 1997, the property's maximum assessed value shall not increase by more than three percent from the previous tax year." ORS 308.146(1) restates that in operating terms, and your assessed value — the figure the tax rate is applied to — is the lesser of MAV and RMV under ORS 308.146(2).
Because MAV started from a mid-1990s baseline and has been capped ever since, most long-held Oregon homes are assessed well below what they would sell for. The two neighbors are taxed on two different MAV histories, not two different markets.
The reset events are enumerated, and the list is short. Under ORS 308.146(3), MAV is re-determined only if the property is new property or new improvements to property; is partitioned or subdivided; is rezoned and used consistently with the rezoning; is first taken into account as omitted property; becomes disqualified from exemption, partial exemption or special assessment; or is subject to a lot line adjustment.
Notice what is missing: no transfer trigger, no change-of-ownership trigger, no purchase-price trigger. Oregon does not reassess to the sale price.
For a buyer, that makes the seller's most recent tax figure a more meaningful starting point than it would be in a reassessment state. It is still only a starting point — a pending exception event, a new levy, or an expiring exemption can all move the number — but the sale itself does not cause a jump.
If you buy to renovate, this is the section that matters.
ORS 308.149(6) defines "new property or new improvements" as changes in value resulting from new construction, reconstruction, major additions, remodeling, renovation or rehabilitation, or the siting, installation or rehabilitation of manufactured structures or floating homes. It expressly excludes general ongoing maintenance and repair and minor construction.
"Minor construction" carries a dollar definition in ORS 308.149(5) — as codified, additions whose real market value does not exceed $18,200 in an assessment year or $45,000 cumulatively over five assessment years. The statute directs the Department of Revenue to index those amounts annually to the Consumer Price Index for the West Region beginning with the 2025 assessment year, so ask your county assessor for the figure in force for the year you are planning.
When an improvement does count, ORS 308.153 does not simply add its market value to MAV. It adds the improvement's real market value multiplied by a ratio of average MAV to average RMV for that property class and area, capped at 1.00. That ratio is why the assessed effect of a remodel is usually smaller than its cost, and why nobody can quote it in advance: it is county-specific and set annually.
ORS 308.156 handles the remaining resets with the same ratio, applied to the affected portion. Two show up in ordinary transactions — buying a parcel the seller split before closing, and buying land coming out of farm or forest special assessment. Ask the assessor which statute the account is being handled under before you rely on last year's statement.
Under ORS 308.146(5), when part of a property is destroyed or damaged by fire or act of God, MAV must be reduced for the year the loss appears in real market value. If the damage occurs between January 1 and July 1, ORS 308.146(6) lets the owner, or a purchaser under a recorded instrument of sale, apply to have value redetermined as of July 1 — filed by the later of August 1 or the 60th day after the damage. When a building is demolished or removed, ORS 308.146(8) allows a reduction only if the owner files an application with the assessor on or before December 31 following the assessment date.
The 3 percent cap governs value. A separate constitutional limit governs rate. Article XI, section 11b splits property taxes into two categories and caps each per $1,000 of real market value: $5 per $1,000 for the public school system and $10 per $1,000 for government other than schools, from fiscal 1995-96 onward.
The Department of Revenue describes what happens when combined district rates would exceed a category limit: the taxes are reduced, or "compressed," until the limit is met. Local option taxes compress first; if that is not enough, the remaining taxes in the category are reduced proportionally. Voter-approved bond levies for capital construction sit outside these limits. Compression is measured against RMV, not assessed value — which is why a falling market can change a bill through a channel unrelated to MAV.
Article IX, section 15 of the Oregon Constitution provides that the state, a city, county, district or other political subdivision "shall not impose, by ordinance or other law, a tax, fee or other assessment upon the transfer of any interest in real property, or measured by the consideration paid or received upon the transfer of any interest in real property."
Adopted by the voters in November 2012, it grandfathers anything "in effect and operative on December 31, 2009." Washington County's pre-existing transfer tax is the practical exception; elsewhere in Oregon no new one can be created.
Two escrow points follow. Under ORS 311.252, a mortgagee that pays your taxes may request a copy of the statement from the tax collector on or before October 1. And the discount depends on when money actually moves: if your taxes are escrowed, ask your servicer whether it disburses the full year by November 15. ORS 311.507 preserves the discount only in narrow situations, such as a late statement from the county.
For county financing limits in the Portland market, see our Portland loan limits guide and our local page for Portland. Other markets are listed in our locations directory.
Program pages that come up in Oregon purchases: conventional, FHA, VA and jumbo financing. Model scenarios with our calculators.
For an Oregon estimate built on the correct assessed-value assumption rather than a market-value guess, find a licensed loan officer in our loan officer directory or get started.
No. Oregon re-determines maximum assessed value only for listed exception events — new property or improvements, partition or subdivision, rezoning used consistently with the rezoning, omitted property, disqualification from an exemption or special assessment, and lot line adjustments. Change of ownership is not on that list, so a sale alone does not trigger a reassessment.
Real market value is the county appraiser's estimate of what the property would sell for. Maximum assessed value is a statutory ceiling that grows by no more than three percent a year. The taxable assessed value your rate is applied to is the lesser of the two, under ORS 308.146(2).
It can. ORS 308.149(6) treats new construction, reconstruction, major additions, remodeling, renovation and rehabilitation as new improvements, while excluding general ongoing maintenance and repair and statutorily defined minor construction. The maximum assessed value added is the improvement's market value multiplied by a county ratio, not its full cost.
Tax statements go out on or before October 25. Payment is due in thirds on November 15, February 15 and May 15. ORS 311.505(3) allows a two percent discount on two-thirds of the taxes paid, or three percent where all of the taxes are paid, on or before November 15.
Article IX, section 15 of the Oregon Constitution bars the state and its political subdivisions from imposing a tax, fee or assessment on the transfer of an interest in real property. It grandfathers anything in effect and operative on December 31, 2009, which is why Washington County's existing transfer tax remains.
This article is for general information only and is not legal, tax, or financial advice. State law and investor guidelines change; confirm current requirements with a licensed professional before making decisions. Xpert Home Lending, Inc. is an Equal Housing Lender.