Oregon Part-Year Resident Tax Filing Requirements

If you moved into or out of Oregon during the year, the Oregon part-year resident tax filing requirements are these: file Form OR-40-P, report all income you received while living in Oregon plus any Oregon-sourced income from the months you lived elsewhere, and prorate your deductions and personal exemption credit by the ratio of Oregon income to total income. The whole return turns on one date, the day you established or gave up your Oregon domicile, and on sorting each dollar of income to the correct side of it.

Who Counts as a Part-Year Resident

You’re a part-year resident if you moved into Oregon and became a resident, or moved out and became a resident of another state, at any point during the tax year. Residency is domicile-based: Oregon is your permanent home, the center of your financial and social life, and the place you intend to return to when away.¹

The Department of Revenue looks at several factors to pin down the date: where you registered to vote, where your vehicles are titled, where your bank accounts and financial ties sit, and where your family lives. No single factor is decisive. Someone who moves from California to Portland on July 1 is an Oregon resident from that date forward and a nonresident for the first half of the year. Keep records that prove the date: closing statements, lease agreements, utility activation or disconnection notices, and vehicle registration transfers.

A separate rule can pull you in even without domicile: if you maintain a permanent place of abode in Oregon and spend more than 200 days here in the tax year, you’re treated as a resident, with any fraction of a day counting as a full day.² For a straightforward mid-year move, the domicile date is what governs.

Whether You Have to File

You need to file only if your Oregon gross income during the combined resident and nonresident periods exceeds the threshold for your filing status. For the 2025 tax year:³

Single or married filing separately (spouse takes the standard deduction): more than $2,835
Married filing jointly: more than $5,670
Head of household: more than $4,560
Married filing separately when the other spouse itemizes: any income at all

Oregon gross income here means all income from Oregon sources during your nonresident months plus all income from every source during your resident months. Even if you fall below the threshold, file if Oregon withheld anything from your wages and you want that money back.

Splitting Your Income Between the Two Periods

The part-year calculation has two halves. For the months you lived in Oregon, the state taxes your entire adjusted gross income from every source. For the months you lived elsewhere, it taxes only income from Oregon sources.⁴ Add the two together and you have your Oregon AGI.

Wages

Wages are sourced to where the work was physically performed.⁵ A salary earned before your Oregon move date is not Oregon income, even if your employer is headquartered in Portland. After the move, your wages are Oregon income regardless of where the employer sits. If you worked partly inside and partly outside Oregon during the nonresident period, allocate based on actual days worked in each location. Oregon does not use a convenience of the employer rule, so remote work performed from outside Oregon for an Oregon employer is generally not Oregon income during your nonresident period.

Watch the receipt dates on bonuses and stock option exercises. A bonus deposited after your move date is Oregon income even if you earned it entirely from work done in your old state, because Oregon taxes all income received during residency.

Business, Investment, and Rental Income

Self-employment and business income is Oregon-sourced to the extent the business is carried on within the state, with apportionment if it operates in more than one place.⁵

Dividends, interest, and capital gains from personal investments are only Oregon-sourced during the nonresident period if the underlying asset is used in an Oregon business.⁵ A stock portfolio you hold personally doesn’t generate Oregon income before you become a resident. After the move, all your investment income is taxable regardless of where the asset is held.

Rental income follows the property, not the person. A building in Eugene generates Oregon income whether you live in Portland or New York.⁵

Pass-Through Entities

Income from partnerships and S corporations gets prorated by the number of days you were a resident during the entity’s tax year, and the Oregon-sourced portion is calculated separately for your nonresident days.⁴ With a July 1 move, roughly half the entity income falls in each period, and only the Oregon-sourced share of the nonresident half hits your Oregon AGI.

The Oregon Percentage and Prorated Deductions

Once you have your Oregon AGI, divide it by your federal AGI (with Oregon modifications) to get your Oregon percentage. That single ratio drives the rest of the return.⁶ If you earned $100,000 total and $60,000 is Oregon income, your Oregon percentage is 60%.

Oregon has its own standard deduction, lower than the federal amount. For 2025 it’s $2,835 for single filers and $5,670 for married joint filers.³ Part-year filers multiply that figure by their Oregon percentage. A single filer at 60% claims $1,701 of the $2,835.

If you itemize, calculate total allowable Oregon itemized deductions first, then multiply the sum by your Oregon percentage. You can’t pick individual deductions to prorate and leave others whole. Oregon uses whichever is larger, the prorated standard deduction or the prorated itemized total.⁶

The personal exemption credit gets the same treatment. Oregon’s exemption credit is $256 per qualifying person for 2025.³ At 60%, that $256 becomes about $154.

Filing Form OR-40-P

Part-year residents file on Form OR-40-P.⁷ The form uses two columns. The federal column shows your total income as if you were a full-year resident, and the Oregon column shows only what belongs to Oregon. The form also handles the multiplication of your tax by the Oregon percentage.⁸

Attach the front and back of your federal Form 1040 (or 1040-SR), plus Schedules 1, 2, and 3 if you filed them. Without the federal return, Oregon may adjust or deny your subtractions, deductions, and credits.⁹

Part-year filers also use Schedule OR-ASC-NP, which is the nonresident and part-year version of the adjustment schedule. Every addition, subtraction, modification, or credit you claim with a code from Publication OR-CODES goes on Schedule OR-ASC-NP rather than on Form OR-40-P directly.¹⁰

Credit for Taxes Paid to Another State

Mid-year moves create obvious overlap. A bonus you earned working in your old state but received after moving is taxed by Oregon as resident income. If your old state also taxes it, you’d pay twice on the same money without relief. Oregon provides a credit against this double taxation.

The credit equals the lesser of two figures: the tax you actually paid to the other state on the overlapping income, or the share of your Oregon tax liability that corresponds to that same income relative to your total modified AGI.¹¹ If the other state’s rate is higher, Oregon covers only its own share.

One limitation catches many filers: Oregon will not grant this credit if the other state already offers nonresidents a credit for taxes paid to their home state. The idea is that one state, not both, provides the relief. Check the other state’s rules before assuming Oregon will cover the overlap. You also can’t deduct the other state’s tax and claim the credit on the same income; it’s one or the other.¹¹ Attach a copy of the other state’s return to support your claim. The credit applies only to income taxes, not property, local, or sales taxes.

Deadlines, Extensions, and Estimated Payments

Form OR-40-P is due April 15, the same day as your federal return. A valid federal extension obtained by filing IRS Form 4868 automatically extends your Oregon filing deadline to October 15.¹²

The extension buys time to file, not time to pay. Estimate what you owe and pay it by April 15. Interest runs on any unpaid balance from the original due date, and Oregon charges a 5% penalty for failure to pay on time. When you can’t calculate precisely, overpay and let Oregon refund the difference.

Oregon also requires estimated tax payments during the year if you expect to owe more than $1,000, which can catch mid-year movers off guard. You avoid the underpayment penalty if your estimated payments equal 100% of either the current year’s or the prior year’s tax.¹³

Two Extras Beyond OR-40-P

Statewide Transit Tax

Oregon imposes a 0.1% statewide transit tax on wages. While you’re a resident, it applies to your wages regardless of where you earn them. During the nonresident portion of the year, it applies only to wages for work performed in Oregon.¹⁴ Employers normally withhold it, but self-employed filers and anyone whose withholding was wrong needs to account for it. There is no minimum threshold for filing the transit tax return.

Portland Arts Tax

If your move involves Portland, the Arts Tax is a separate obligation with an important quirk: the city does not prorate it. Whether you moved to Portland in January or November, you owe the full annual amount. The same applies if you moved away during the year.¹⁵ File and pay it directly to the City of Portland, not through your state return.

1
Oregon Department of Revenue. What Form Do I Use
2
Oregon Public Law. Oregon Code 316.027 – Resident Defined
3
Oregon Department of Revenue. 2025 Publication OR-17 Oregon Individual Income Tax Guide
4
Oregon Public Law. Oregon Code 316.119 – Proration of Part-Year Residents Income Between Oregon Income and Other Income
5
Oregon Public Law. Oregon Code 316.127 – Income of Nonresident From Oregon Sources
6
Legal Information Institute. Oregon Administrative Code 150-316-0135 – Proration of Income and Deductions for Nonresidents and Part-Year Residents
7
Oregon Department of Revenue. 2025 Form OR-40-P Oregon Individual Income Tax Return for Part-Year Residents
8
Oregon Department of Revenue. Personal Income Tax – Individuals
9
Oregon Department of Revenue. 2025 Publication OR-40-FY Oregon Income Tax Full-Year Resident Instructions
10
Oregon Department of Revenue. Publication OR-40-NP Oregon Income Tax Part-Year Resident and Nonresident Instructions
11
Oregon Public Law. Oregon Code 316.082 – Credit for Taxes Paid Another State
12
Oregon Department of Revenue. 2025 Publication OR-40-EXT Instructions for Automatic Extension
13
Oregon State Legislature. Oregon Revised Statutes 314.525 – Underpayment of Estimated Tax
14
Oregon Department of Revenue. Statewide Transit Tax
15
City of Portland. LIC-11.09 – Residency