Cost Segregation Study in Oregon

Oregon is arguably the best state in the country for a cost segregation study, and almost nobody talks about it. It has one of the highest state income tax rates in the nation at 9.9%, it conforms fully to federal bonus depreciation with no addback, and the Portland-area local income taxes ride on Oregon taxable income, which means the same deduction reduces three separate tax bases at once.

For a Multnomah County resident, a dollar of accelerated depreciation can be worth more than fourteen cents of combined Oregon and local tax in the year it is claimed. That is a larger state-level benefit than any other state provides.

How Oregon Income Tax Interacts With Federal Strategy

Oregon's individual income tax runs on a graduated schedule topping out at 9.9%. Oregon does not give long-term capital gains a preferential rate, so gains are taxed at the same rates as ordinary income. Oregon has no sales tax.

The Portland metropolitan area layers two additional local income taxes on top. The Metro Supportive Housing Services tax is 1% on taxable income above $125,000 for single filers and $200,000 for joint filers. The Multnomah County Preschool for All tax is 1.5% on income above those same thresholds, rising to 2.3% above $250,000 single and $400,000 joint, and to 3% above $500,000 single and $1 million joint under the rate increase that took effect for 2026.

Both local taxes start from Oregon taxable income, which means Oregon's federal depreciation conformity flows all the way through. A cost segregation deduction that reduces federal taxable income reduces Oregon taxable income, which reduces both the Metro and Multnomah County tax bases.

Oregon conforms to the federal passive activity loss rules of IRC Sec. 469. The usual gate applies.

Oregon Pass-Through Entity Elective Tax

Oregon created its pass-through entity elective tax, known as the PTE-E, through Senate Bill 727 in 2021. The rate is 9% on the first $250,000 of distributive proceeds and 9.9% on amounts above that.

Owners receive a refundable Oregon credit for their share of the tax paid, and the entity deducts the tax on its federal return, moving that portion of Oregon tax outside the individual state and local tax deduction cap. At Oregon's rates the federal benefit is substantial.

One caution. Oregon tied the PTE-E's availability to the existence of the federal state and local tax deduction limitation, and the statute has been extended more than once as the federal cap has been extended. Confirm the election is available for the specific tax year before relying on it in a projection. This is a live issue rather than a settled one, and it is worth checking the current-year status directly rather than assuming continuity.

Note also that the PTE-E credit applies to Oregon income tax. It does not offset the Metro or Multnomah County local taxes, which remain individual-level obligations.

Oregon Depreciation Conformity

Oregon is a rolling conformity state. It connects to the federal definition of taxable income and allows bonus depreciation under IRC Sec. 168(k) and Section 179 at full federal limits with no addback and no decoupling form.

Oregon basis equals federal basis from acquisition to disposition. There is no second depreciation schedule and no divergence to track. When you sell, Oregon gain equals federal gain.

That conformity is what makes Oregon exceptional. A study delivering a $700,000 first-year federal deduction delivers the same $700,000 against Oregon taxable income, and against the Metro and Multnomah County bases below it.

Cost Segregation Considerations Specific to Oregon

Four Oregon-specific items are worth building into the model.

First, compute the combined rate properly. A Multnomah County resident at the top of every schedule faces 9.9% Oregon, 1% Metro, and 3% Preschool for All, for a combined 13.9% marginal rate before federal tax. The state and local benefit of a cost segregation deduction at that rate is enormous, and it is on top of a federal benefit of up to 37%. Combined, the first-year value of a deduction can exceed fifty cents on the dollar.

Second, remember that the local tax thresholds create cliffs the way a surtax does. The Preschool for All rate steps from 1.5% to 2.3% to 3% at specific income levels. A deduction that keeps you below a step is worth more at the margin than the average rate suggests, which makes timing the placed-in-service year or a Form 3115 lookback catch-up meaningfully valuable.

Third, consider the Oregon Corporate Activity Tax if you operate through an entity with substantial gross receipts. The CAT applies at 0.57% on Oregon commercial activity above $1 million, after a 35% subtraction for cost inputs or labor costs. It is a gross receipts tax, so depreciation does not reduce it. Rental receipts can be within the CAT base, which is a consideration for larger portfolios and one that a cost segregation study does nothing to address.

Fourth, plan the exit. Oregon taxes recapture and capital gain at the same graduated rates up to 9.9% with no preference, so the study does not create rate arbitrage against you on disposition the way it does in a state with a capital gains exclusion. Because Oregon basis equals federal basis, there is no divergence error to make. Oregon is administratively clean on the way out as well as on the way in.

Working With AE Tax Advisors in Oregon

AE Tax Advisors works with real estate investors, business owners, and high-income professionals across Oregon and all fifty states. We are a licensed CPA and IRS Enrolled Agent practice based in Billings, Montana, and we handle the engineering-based cost segregation study, the Oregon and Portland-area local return modeling, the PTE-E election analysis, the entity structuring, and the return preparation as one engagement.

Most cost segregation providers quote Oregon investors a federal-only benefit number. In Oregon that understates the result badly, because the state and local layer adds more here than anywhere else in the country. We model all of it before the study is commissioned.

Related reading: the complete guide to cost segregation, our cost segregation study service, short-term versus long-term rental tax treatment, lookback studies and Form 3115, and multi-state tax planning.

Oregon tax rates, pass-through entity tax rules, and depreciation conformity provisions described on this page reflect law in effect as of August 2026 and are provided for general information only. State conformity changes frequently and often retroactively. Nothing here is tax advice for your situation, and no client relationship is created by reading it. Talk to us about your facts before acting.