Which tax jurisdictions Multnomah County actually contains
Multnomah County is in Multnomah County. Oregon’s local tax boundaries do not follow city limits or ZIP codes, so this is worth being precise about.
- Preschool for All applies to all county residents above the threshold — Portland, Gresham, Troutdale, Fairview, Wood Village and unincorporated areas alike.
- Metro SHS applies across the urbanised portion of the county.
- The Arts Tax applies only inside the City of Portland — so a Gresham resident owes Preschool for All but not the Arts Tax.
- Portland BLT and Multnomah County BIT apply to businesses, on separate but related bases.
The local economy, and what it means for a tax return
The most diverse economy in the region — healthcare, technology, creative and professional services, hospitality, distribution and a very large freelance population. It also has the highest concentration of households above every local threshold.
We work with clients around the City of Portland, the east county cities along I-84, the West Hills and Sauvie Island and the Columbia and Willamette confluence.
Who we work with in Multnomah County
- Freelancers, designers, developers and consultants — the county has an unusually high share of Schedule C filers
- Restaurants, bars and independent retail along the commercial corridors, where payroll and inventory are the real work
- Professional partnerships downtown, most of them candidates for the PTE-E election
- Healthcare and dental practices with a handful of employees and full local withholding obligations
- East county trades and service businesses in Gresham, Troutdale, Fairview and Wood Village
- Landlords, including Clark County residents with Oregon rental property
What we do most of in Multnomah County
Tax situations we see across Multnomah County
The heaviest stack in Oregon
A Portland household above both thresholds files a federal return, an Oregon return, a Metro Supportive Housing Services return, a Multnomah County Preschool for All return and an Arts Tax filing. That is five filings with four governments, and only two of them are the ones anybody expects. Add a business and you add the Portland Business License Tax, the county Business Income Tax and possibly Oregon CAT. No other county in the state comes close.
The county line and the city line are different lines
This is the single most common misunderstanding we correct. Preschool for All follows the county boundary, so Gresham, Troutdale, Fairview and Wood Village residents owe it. The Arts Tax follows the City of Portland boundary, so those same residents do not owe that. Metro SHS follows a third boundary again. People move east expecting to leave the Portland taxes behind and take one of the three with them.
Withholding that has not caught up
Employers have withholding obligations for both Metro SHS and Preschool for All above the thresholds, and a great many of them set the payroll up once and never revisited it. Employees who changed to hybrid or remote schedules are frequently having local tax withheld on days they never entered the county — and employees who crossed a threshold mid-year are frequently having nothing withheld at all. Both are correctable, and both are usually discovered in April.
A county full of unincorporated addresses
Large parts of the county are unincorporated and carry a Portland mailing address without being in the City of Portland. That decides whether you owe the Arts Tax, and it is not something a postcode will tell you. The city and the county both publish address lookups; between them they answer the question definitively in about a minute.
Cities and communities in Multnomah County
Working with us from here
Fifteen to thirty minutes from our Clackamas office depending on where in the county you are.
Clackamas County to the south and Washington County to the west both sit partly inside the Metro district but neither levies a county income tax, so crossing either line removes Preschool for All from a household’s position. Clark County, across the river, removes Oregon income tax on residency but not on Oregon workdays.
Most clients outside the immediate Clackamas area work with us remotely — secure document exchange, a phone or video appointment, and e-filing. If you would rather sit across a desk, both offices do that too: Clackamas and The Dalles.
Questions we get from Multnomah County
Does Preschool for All apply outside Portland?
Yes — throughout Multnomah County, including Gresham, Troutdale, Fairview and Wood Village.
Does the Arts Tax apply outside Portland?
No. It is a City of Portland tax only.
I live in unincorporated Multnomah County.
Then Preschool for All applies on residency, the Arts Tax does not, and Metro SHS depends on whether your address is inside the district. Check by address.
I live in unincorporated Multnomah County. What applies?
Preschool for All applies, because it follows the county line. The Arts Tax does not, because you are outside the City of Portland. Metro SHS depends on whether your address is inside the Metro district — most urbanised parts of the county are.
Does Preschool for All apply to non-residents?
To income sourced to the county, yes. A Lake Oswego or Vancouver resident working at a downtown Portland office can owe it on the county-sourced share of their wages while owing nothing on the rest.
Talk to someone who files these returns every week
Bring last year’s return and whatever changed. Start with a complimentary 15-minute introductory call about your situation and whether we are a good fit.
Written by
Enrolled Agent, Oregon Licensed Tax Consultant
License number: Enrolled Agent 00160070-EA · Oregon Licensed Tax Consultant 35746-C
Heather has spent more than a decade preparing individual and business returns across the Portland metro and the Columbia Gorge, and holds unlimited rights to represent taxpayers before the IRS.
Last reviewed
This page is general information about Oregon, Washington and federal tax rules, not advice about your own return. Thresholds and rates change every year. Figures were verified as of August 2026 — check the linked official sources, or talk to us about your situation.