Portland is an incredible place to build a business, but it comes with a heavy administrative burden.

If you ask a standard, out-of-state accountant to do your taxes, they will likely file your Federal and Oregon State returns and call it a day.

That mistake will cost you thousands of dollars in penalties.

Operating in the Portland metro area means you are subject to up to six overlapping layers of local and regional taxes. At Bridgetown Bookkeeping, we specialize in untangling this web. We make sure you are compliant with the City of Portland Revenue Division without paying a single dollar more than you legally owe.

Here is your survival guide to the 2026 Portland business tax landscape.

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TL;DR: The Portland Tax Checklist

The Tax	Who Pays It	The Trap
City of Portland (2.6%)	Businesses operating in city limits.	Paying tax on all revenue, rather than just Portland-sourced revenue.
Multnomah County (2.0%)	Businesses operating in the county.	Forgetting that the City and County are filed on one combined form.
TriMet Tax (~0.8237%)	Self-employed individuals in the district.	Missing it entirely. It is filed separately with the State, not the City.
Metro SHS (1%)	High earners ($125k Single/$200k Joint)	Failing to make quarterly estimated payments (employers don’t withhold this).
Preschool For All (1.5% – 3%)	High earners (Same as SHS)	Assuming it only applies to W-2 wages. It applies to your business pass-through income, too.
Oregon CAT (0.57%)	Businesses with >$1M in Oregon sales.	It is a tax on Gross Receipts, not Net Profit. You owe it even if you lose money.

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1. City of Portland Business License Tax (The Baseline)

If you do business inside the city limits, you owe the City of Portland Business License Tax.

• The Rate: 2.6% of your Net Income (Profit).
• The Mistake: “I work from home in Beaverton, so I don’t owe this.”
• The Reality: If you deliver goods, provide services, or meet clients inside Portland city limits, you have “nexus” and must apportion a percentage of your income to the City.
• The Exemption: If your gross receipts from all sources are less than $50,000, you are exempt from the tax (but you still must file the exemption form).

2. Multnomah County Business Income Tax (MCBIT)

Often confused with the City tax, the Multnomah County tax covers a wider geographic footprint (including Gresham and Troutdale).

• The Rate: 2.0% of your Net Income.
• The Convenience: You file this together with your City of Portland tax using the combined City/County Business Tax Return.
• The Strategy: We ensure your “Apportionment” calculations are pinpoint accurate. You might owe the County tax but not the City tax, depending on exactly where your clients are located.

3. The TriMet Self-Employment Tax (The “Ghost Tax”)

We call this the Ghost Tax because it sneaks up on Schedule C sole proprietors and partners.

• The Target: If you have self-employment income and perform work within the TriMet boundary (which includes parts of Washington and Clackamas counties), you owe this.
• The Trap: Out-of-state CPAs routinely miss this because it isn’t part of your standard Federal or State income tax return. You must file a separate form (Form TM) directly with the Oregon Department of Revenue.
• The Fix: We map your business address and client locations against the TriMet boundary to ensure compliance before you get hit with a failure-to-file penalty.

4. Metro Supportive Housing Services (SHS) Tax

Voted in recently, this tax funds homeless services across the tri-county Metro region (Multnomah, Washington, Clackamas).

• The Personal Tax: 1% on taxable income above $125,000 (Single) or $200,000 (Joint).
• The Business Tax: 1% on net income for businesses with gross receipts over $5 million.
• The Bookkeeping Role: If your small business passes its profit through to your personal return, that business income counts toward your $125k/$200k threshold. We help you project your year-end profit so you can make estimated payments during the year.

5. Multnomah County Preschool For All (PFA) Tax

Similar to the Metro SHS tax, this is an income tax aimed at high earners, but it is restricted strictly to Multnomah County residents and income sourced within the county.

• The Rate (2026): 1.5% on income over $125k/$200k, and 3% on income over $250k/$400k.
• The Double Whammy: Yes, if you live in Portland and make $250k, you are paying the Metro SHS and the PFA tax on the same dollars.
• The Fix: We set up dedicated tax savings accounts (Profit First methodology) to ensure you are reserving enough cash to cover both of these hefty regional taxes.

6. Oregon Corporate Activity Tax (CAT)

If you run a high-volume, low-margin business (like a restaurant, retail store, or construction firm), the CAT is your biggest threat.

• The Rule: If your gross receipts in Oregon exceed $1 Million, you owe 0.57% on the excess, plus $250.
• The Danger: This is a tax on Revenue, not Profit. You could lose $50,000 this year, but if you grossed $1.5M, you still have to write a check to the State of Oregon.
• The Bookkeeping Strategy: You are allowed to deduct 35% of either your Cost of Goods Sold (COGS) or Labor costs. We keep your Chart of Accounts meticulously clean so we can easily calculate which deduction saves you the most money.

7. The Magic of “Apportionment”

If your business is based in Portland, but you sell software to clients in Seattle and Austin, do you pay Portland tax on all that money?

No.

• You only pay local taxes on income apportioned (assigned) to that locality.
• If only 20% of your sales are to Portland customers, you only pay the 2.6% City tax on 20% of your net income. Tracking revenue by client location is the #1 way we lower our clients’ local tax bills.

8. The Owner’s Compensation Deduction

This is the single biggest deduction on the Portland/Multnomah County business tax return, and DIY filers miss it constantly.

• The Rule: You are allowed to deduct a portion of the owner’s compensation (up to $161,500 per owner for tax year 2025/2026) from the business’s net income before calculating the tax.
• The Impact: This can wipe out thousands of dollars in local tax liability for LLCs and S-Corps. We ensure this deduction is maximized on every local return we prep data for.

9. Stopping the Bleeding: Quarterly Estimates

The City of Portland Revenue Division does not play around with interest. If you wait until April 15th to pay these 6 taxes, you will be hit with Underpayment Penalties and hefty interest charges.

• The Solution: You must make quarterly estimated payments to the City of Portland/Multnomah County, the State of Oregon, and the IRS.
• We provide you with a quarterly “Tax Blueprint” so you know exactly how much to send to each agency on April 15, June 15, September 15, and January 15.

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Don’t Pay the “Portland Penalty”

You shouldn’t have to become a tax attorney just to run a coffee shop or a consulting firm in Portland.

At Bridgetown Bookkeeping, we build financial systems that automatically track your tax liabilities across all local jurisdictions. We give you peace of mind so you can get back to growing your business.

Want to make sure you aren’t overpaying the City of Portland?