Oregon Corporate Activity Tax: What Small Businesses Need to Know About CAT Filing, Thresholds, and Planning
Oregon Corporate Activity Tax (CAT) is a gross receipts tax imposed on businesses with commercial activity in Oregon above a specific revenue threshold. It applies broadly across entity types and can catch small business owners off guard if they haven’t planned for it.
This guide focuses specifically on Oregon CAT filing requirements, revenue thresholds, and practical tax planning strategies for small business owners operating in 2026.
Oregon CAT Definition: The Oregon Corporate Activity Tax is a statewide gross receipts tax that applies to most businesses earning more than $750,000 in Oregon commercial activity, calculated on taxable commercial activity minus an allowable subtraction, with a flat $250 registration fee for those between $750,000 and $1,000,000.
The CAT has been in effect since 2020, and many small business owners in Beaverton and across the state still misunderstand who it applies to and how it works. The most common mistake we see is assuming the CAT only affects large corporations. It doesn’t. Any business with Oregon commercial activity above the threshold has obligations here, regardless of structure or profitability.
Who Actually Owes the Oregon CAT?
The threshold structure matters a lot. Here’s how it breaks down under current Oregon law (2026):
- Under $750,000 in Oregon commercial activity: no CAT owed, no registration required
- $750,000 to $1,000,000: must register and pay a $250 registration fee; no tax is owed.
- Over $1,000,000: $250 minimum tax plus 0.57% on taxable commercial activity above $1,000,000
The tax is based on gross receipts, not net income. That’s a critical distinction. A business can be operating at a loss and still owe CAT if its top-line Oregon revenue crosses the threshold.
Taxable commercial activity: Oregon-sourced gross receipts from the sale of goods, services, rentals, royalties, and most other business transactions, reduced only by the allowable cost subtraction.
Cost subtraction: Businesses can subtract 35% of either their cost of goods sold or their labor costs from Oregon commercial activity before calculating what’s owed, whichever produces a better result.
According to the Oregon Department of Revenue, the CAT applies to most entity types including C corps, S corps, LLCs, sole proprietors, and partnerships. The structure of your business doesn’t create an exemption.
Oregon CAT vs. Neighboring State Gross Receipts Taxes
Where Oregon CAT succeeds: The 35% cost subtraction reduces the effective tax burden compared to a pure gross receipts tax. The $750,000 threshold keeps most micro-businesses out entirely. The rate of 0.57% is relatively low compared to Washington’s B&O tax in certain sectors.
Where Oregon CAT fails: It taxes gross revenue regardless of profitability, which squeezes businesses in low-margin industries. Filing and estimated payment requirements add administrative complexity for small teams.
Where Washington B&O succeeds: Washington’s Business and Occupation tax has tiered rates by industry classification, which can mean lower effective rates for some service businesses. No corporate income tax in Washington helps offset it.
Where Washington B&O fails: It has no income offset and applies to nearly all gross receipts from the first dollar in many categories, with fewer subtraction options than Oregon.
The verdict: Oregon’s CAT is more favorable than it first appears for businesses with significant labor or material costs, thanks to the subtraction option. But businesses with thin margins or high revenues need a clear strategy built before year-end, not after.
| State | Tax Type | Rate | Threshold | Subtraction Available? |
|---|---|---|---|---|
| Oregon | Corporate Activity Tax | 0.57% | $750,000 | Yes (35% labor or COGS) |
| Washington | B&O Tax | 0.471%-1.5%+ by sector | $0 (most categories) | Limited |
| California | Franchise/Income Tax | 8.84% on income | $800 minimum | Income-based |
| Nevada | Commerce Tax | 0.05%-0.331% | $4,000,000 | Yes |
| Idaho | Corporate Income Tax | 5.8% on income | Nexus-based | Income-based |
Thinking about this for your situation? Let’s talk. We’ll walk you through your options – no pressure. Contact us to schedule a conversation with the team at Perpetual CPA LLP.
Common CAT Filing Mistakes That Cost Oregon Businesses Money
The pattern we see repeatedly comes down to a few avoidable errors.
- Missing estimated payment deadlines: CAT payments are due quarterly in April, July, October, and January. Missing these triggers penalties even if the annual return is filed correctly.
- Misidentifying Oregon commercial activity: Some businesses incorrectly exclude Oregon-sourced revenues or fail to properly source receipts to the state.
- Choosing the wrong subtraction method: Picking labor cost vs. cost of goods sold without running the numbers first leaves real money on the table.
- Failing to register: Businesses that cross the $750,000 threshold mid-year sometimes don’t realize they need to register until they file their annual return – by which point penalties have already accrued.
- Treating CAT like an income tax: Because the CAT is calculated on gross receipts, applying income tax logic to it causes systematic errors in estimates and planning.
Your Oregon CAT Action Plan
- Step 1 – Track Oregon-Sourced Revenue Separately: Set up your accounting system to tag revenue by source state. You need clean Oregon commercial activity figures to calculate CAT accurately and avoid over- or under-reporting.
- Step 2 – Calculate Both Subtraction Options: Pull your annual labor costs and cost of goods sold, then apply the 35% factor to each. Use whichever produces a lower taxable commercial activity figure.
- Step 3 – Register Before You Hit $750,000: Don’t wait until year-end. If you’re tracking toward the threshold in 2026, register with the Oregon Department of Revenue proactively to avoid late registration issues.
- Step 4 – Build Quarterly Estimates Into Cash Flow: CAT estimated payments are due four times a year. Build these into your cash flow projections so they don’t arrive as surprises.
- Step 5 – Review Entity Structure Annually: Some entity structures affect how CAT is calculated or whether certain income sources qualify for exclusions. Review this with your CPA each year, especially if your business mix changes.
- Step 6 – File the Annual Return by April 15: The Oregon CAT annual return is due April 15 following the tax year. Extensions are available but do not extend the payment deadline.
CAT Filing Preparation Checklist
- ☐ Oregon commercial activity total for the year
- ☐ Labor cost documentation (wages, salaries, benefits paid)
- ☐ Cost of goods sold from financial statements
- ☐ Quarterly estimated payment records
- ☐ Oregon DOR registration confirmation number
- ☐ Documentation of any excluded receipts (sales to non-Oregon customers, exempt transactions)
- ☐ Prior year CAT return for comparison
For a full overview of how we approach tax planning and compliance for Oregon businesses, visit our services page.
Key Takeaways for Oregon Small Business Owners in 2026
- The $750,000 threshold applies to gross Oregon receipts – not net income, not profit
- The 35% cost subtraction is your most important planning lever – calculate both options every year
- Quarterly estimated payments matter – missing them creates penalties independent of your annual filing accuracy
- Registration is required before you owe – once you cross $750,000, you need to register, even if the minimum tax is only $250
- Oregon CAT stacks on top of federal income tax – it’s a separate obligation, not a credit or offset against what you owe the IRS
Frequently Asked Questions
What is the Oregon Corporate Activity Tax threshold for 2026?
The Oregon CAT threshold is $750,000 in Oregon commercial activity for 2026. Businesses below this amount have no CAT obligation and no registration requirement. Those between $750,000 and $1,000,000 owe a flat $250 minimum tax.
Does the Oregon CAT apply to sole proprietors and LLCs?
Yes, the Oregon CAT applies to sole proprietors, LLCs, S corps, C corps, and partnerships – entity type does not create an exemption. What matters is whether the business has Oregon commercial activity above the $750,000 threshold, not how the business is organized.
How is the Oregon CAT rate calculated?
The Oregon CAT rate is 0.57% applied to taxable commercial activity above $1,000,000, after the allowable cost subtraction. Businesses first subtract 35% of either their labor costs or cost of goods sold, whichever is larger, before applying the rate.
When are Oregon CAT estimated payments due in 2026?
Oregon CAT estimated payments are due quarterly: April 30, July 31, October 31, and January 31. Businesses that expect to owe more than $5,000 annually are required to make these quarterly payments or face underpayment penalties.
Can a business owe Oregon CAT even if it lost money?
Yes, because the CAT is based on gross receipts, not net income, a business can owe it even during a loss year. This is one of the most significant planning challenges for businesses in low-margin industries like retail, construction, and distribution.
What receipts are excluded from Oregon CAT?
Certain receipts are excluded from Oregon commercial activity, including receipts from the sale of motor vehicle fuel subject to Oregon fuel taxes, receipts from Oregon lottery games, and some agricultural cooperatives. The Oregon Department of Revenue maintains the full exclusion list.
Is professional help worth it for Oregon CAT filing?
For most businesses near or above the $1,000,000 threshold, working with a CPA typically saves more than it costs through proper subtraction method selection and accurate estimated payments. The planning decisions around CAT compound across years, making early guidance particularly valuable.
What This Means for Your Business Right Now
Oregon’s CAT is not going away, and the compliance requirements are real. Businesses that treat it as an afterthought during tax season end up paying more – in penalties, missed subtractions, and rushed decisions. The good news is that with proper planning, the effective burden is manageable for most small businesses.
Recent shifts in how Oregon DOR is auditing CAT returns make accurate sourcing and subtraction documentation more important heading into 2027. Getting your records and methodology clean in 2026 protects you going forward.
Ready to take the next step? Contact us today for straight answers and real solutions. The team at Perpetual CPA LLP works with small businesses throughout Beaverton, OR and the surrounding area to make Oregon tax compliance straightforward and defensible.
