Oregon Mortgage Calculator
Unlike almost every other capped state, Oregon’s assessed value follows the property, not the sale, which means two identical homes on the same street can owe wildly different tax bills — pick your county below to see your real payment.
Loan & Property Details
A starting estimate only. Because Oregon’s assessed value depends on the property’s sale history, the seller’s actual current tax bill is a better guide than any rate-based calculator, this one included.
Your Estimated Monthly Payment
Choose a county and enter your details to see a plain-language read on your payment.
What If You Paid Extra Toward Principal?
Slide to test an extra monthly payment and see how many years and how much interest it saves.
What If Your Rate Changes?
Your 5-Year Equity Snapshot
Good to Know: Oregon Banned Transfer Taxes, With One Grandfathered Exception
A 1997 state law prohibits new local transfer taxes statewide; only jurisdictions that already had one keep it.
| Statewide transfer tax | None (banned by state law since 1997) |
| Washington County | $1.00 per $1,000 of sale price (0.1%), grandfathered in, first $500 exempt on owner-occupied sales |
| Multnomah, Clackamas, and Lane counties | None |
| Who customarily pays in Washington County | Seller, typically split by local custom or negotiation |
Does Oregon Property Tax Reset When You Buy a House? No, and That Changes Everything
If you’ve researched property tax caps in other states, you’ve probably seen the pattern: a longtime owner gets protected from rising values, but the moment the home sells, the assessed value resets to the sale price and the new buyer starts fresh. Oregon works differently, and it’s the single most important thing to understand before using any Oregon property tax calculator, this one included. Under Measure 50, passed by voters in 1997, every property has a Maximum Assessed Value, MAV, that grows no more than 3% a year, and unlike Michigan, Nevada, New Mexico, or Oklahoma’s versions of a similar idea, Oregon’s MAV does not reset when the property is sold. A new buyer simply inherits whatever assessed value the previous owner had built up. Actual taxes are based on the lower of MAV or Real Market Value, RMV, so in a home that’s appreciated significantly since its last sale or since 1997, the assessed value can sit dramatically below what the home is actually worth.
Why two identical houses on the same street can owe very different taxes
Because MAV tracks a property’s ownership and improvement history rather than its current price, two nearly identical homes next door to each other can carry meaningfully different tax bills, simply because one sold more recently or more often than the other. A home that’s changed hands several times in the last decade, each sale following market appreciation more closely, will often show an assessed value closer to its real market value. A home the same family has owned since the 1990s can carry an assessed value dramatically below what it would sell for today, and that gap gets inherited by whoever buys it next. This is exactly why the seller’s current, printed tax bill, not a generic percentage-of-price calculator, is the single best predictor of what a specific Oregon home will actually cost to own.
Multnomah, Washington, Clackamas, and Lane: how the four biggest counties compare
Multnomah County, home to Portland, runs the highest effective rate of the four, driven by a dense stack of overlapping levies including the Portland Metro Housing Bond, the county library levy, and the Portland Children’s Levy. Washington County, covering Beaverton and Hillsboro, runs a noticeably lower effective rate. Clackamas County, stretching from Portland’s southern suburbs to Mount Hood, lands between the two, with rates that vary considerably by specific city jurisdiction, Lake Oswego and Oregon City differ meaningfully from each other. Lane County, home to Eugene, runs a moderate rate on generally lower home values than the Portland metro counties. Switching counties above resets both price and rate defaults to match, though remember these are effective-rate estimates, not a substitute for the actual assessed value on a specific parcel.
Measure 5’s rate ceiling, and what “compression” means for your bill
Separate from Measure 50’s value cap, Measure 5, passed in 1990, limits the tax rate itself: no more than $5 per $1,000 of real market value for education funding and $10 per $1,000 for general government, a combined ceiling equivalent to roughly 1.5% of RMV before any voter-approved bonds are added. When a property’s total levies from every overlapping district would exceed that ceiling, a process called compression kicks in, reducing local option levies first and then permanent rate components, so the bill doesn’t exceed the constitutional limit. Compression shows up more often in heavily-levied areas like inner Multnomah County than in rural counties with fewer overlapping districts. Bond levies specifically approved by voters, for schools, fire districts, or transit, sit outside this cap and can meaningfully raise a bill on top of the regular rate.
Relief programs: a deferral, not a discount, plus a modest veteran exemption
Oregon doesn’t offer a general homestead exemption the way many other states do. Instead, its main senior and disabled relief comes through a property tax deferral program, which doesn’t reduce the current bill at all; it lets qualifying homeowners postpone payment, with the state paying the county directly and recovering the deferred amount, plus interest, from the estate or at a future sale. It’s a genuinely useful cash-flow tool for an income-limited senior who wants to stay in their home, but it isn’t a discount, and it doesn’t change what this calculator estimates. Separately, veterans with a service-connected disability of 40% or more, and surviving spouses of veterans, can exclude roughly $24,800 of assessed value from their bill, or about $29,800 for veterans rated 100% disabled, indexed annually and filed with the county assessor.
Common Mistakes Oregon Buyers Make With the Numbers
- Assuming a percentage-of-price calculator gives an accurate number. In Oregon specifically, it’s only a rough estimate; the property’s actual assessed value depends on its individual sale and improvement history.
- Not asking for the seller’s current tax bill. It’s public record and is a far better predictor of your future bill than any calculator, including this one.
- Assuming newer construction gets the same low assessed value as an older home nearby. New construction and major additions are valued closer to current market value before the 3% cap begins protecting them going forward.
- Confusing the Senior and Disabled Property Tax Deferral with an exemption. It postpones payment with interest rather than reducing the bill.
- Forgetting Washington County’s grandfathered transfer tax. It’s a genuine exception to Oregon’s statewide ban and doesn’t apply anywhere else in the state.
Tips for Buying Smart in Oregon
- Ask your agent for the seller’s current property tax statement before making assumptions from any online calculator.
- Check whether the home you’re considering was recently reassessed due to a sale, new construction, or major remodel, since that resets its position relative to market value going forward.
- If a veteran is on title with a qualifying disability rating, file for the veteran’s exemption with your county assessor.
- Budget for Washington County’s transfer tax specifically if you’re buying there; it doesn’t exist anywhere else in the state.
- Use the extra-payment scenario above; even a modest additional principal payment compounds meaningfully over a 30-year Oregon loan.
Frequently Asked Questions
Does Oregon property tax reset when you buy a house?
No. Under Measure 50, the Maximum Assessed Value transfers with the property at sale rather than resetting to the purchase price, which is different from most other states with a similar valuation cap.
Why is my Oregon property tax so much lower than my home’s market value would suggest?
Because taxes are based on Maximum Assessed Value, capped at 3% annual growth since 1997 and not reset at sale, a property that hasn’t changed hands recently can carry an assessed value well below its current market value.
What is Oregon’s Measure 50?
A 1997 voter-approved law that created a Maximum Assessed Value for every property, generally limited to 3% annual growth, with actual taxes based on the lower of that figure or real market value.
What is Measure 5 compression in Oregon?
Measure 5 caps combined tax rates at $5 per $1,000 of real market value for education and $10 per $1,000 for general government; when overlapping levies would exceed that, local option levies are reduced first, a process called compression.
How much is property tax in Oregon?
Oregon’s statewide effective property tax rate runs below the national average, with Multnomah County posting the highest effective rate among the state’s largest counties due to numerous overlapping levies.
Does Oregon have a homestead exemption?
No general homestead exemption exists. Oregon instead offers a Senior and Disabled Property Tax Deferral program, which postpones rather than reduces the tax bill.
Do veterans get a property tax break in Oregon?
Yes, veterans with a service-connected disability of 40% or more, and surviving spouses of veterans, can exclude roughly $24,800 of assessed value, or about $29,800 for a 100% disability rating.
Does Oregon have a real estate transfer tax?
No statewide transfer tax exists; a 1997 law banned new local transfer taxes, though Washington County kept a grandfathered tax of $1.00 per $1,000 of sale price.
Which Oregon county has the lowest property tax rate?
Among the state’s larger counties, Washington County generally runs a lower effective rate than Multnomah, Clackamas, or Lane.
Does this calculator include closing costs?
No, this tool estimates the ongoing monthly payment only. Oregon closing costs typically add a modest percentage of the purchase price, with a transfer tax only in Washington County.
References
- Oregon Department of Revenue, property tax and Measure 50 guidance – oregon.gov/dor
- Multnomah, Washington, Clackamas, and Lane County Assessor offices, current tax code area rates – county government sites
- Oregon Ballot Measure 50 (1997); Oregon Ballot Measure 5 (1990); Oregon Revised Statutes Chapter 308
- Freddie Mac Primary Mortgage Market Survey, weekly national rate averages – freddiemac.com/pmms
Related DexoCalc Tools
This Oregon mortgage calculator is part of the Mortgage Calculators cluster I am building out on DexoCalc. Start with the national Mortgage Calculator to compare Oregon against any other state, use the Mortgage Amortization Calculator to see exactly how your loan balance shrinks over time, or compare a state where a similar cap resets at sale instead of transferring in the Nevada Mortgage Calculator or Michigan Mortgage Calculator. Browse every state-specific tool as new ones publish on the full Mortgage Calculators hub.
This calculator provides estimates for educational purposes only and is not a loan offer, pre-approval, or substitute for advice from a licensed Oregon mortgage professional or tax advisor. Property tax figures are approximate and vary significantly by parcel due to Oregon’s Measure 50 assessment history; confirm exact figures with the seller’s tax statement and your county assessor. Sources: Oregon Department of Revenue, county assessor offices, Freddie Mac.