Operating a successful business in Oregon means navigating a complex web of state and local taxes. If your company is experiencing significant growth, there is one specific tax you need to have on your radar well before tax season arrives: The Oregon Corporate Activity Tax (CAT). Despite the word “Corporate” in the name, this tax does not just apply to massive corporations. It impacts LLCs, partnerships, and sole proprietors right here in the Portland metro area.

If your business is scaling, here is exactly what you need to know to stay compliant and protect your margins.

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TL;DR / Quick Summary:

The CAT Feature	The Details	Why It Matters to You
What is it?	A modified gross receipts tax on commercial activity in Oregon.	It is taxed on your top-line revenue, not your bottom-line net profit.
Who pays it?	Businesses with over $1 million in Oregon-sourced commercial activity.	It applies broadly across all entity types: LLCs, S-Corps, C-Corps, and Sole Proprietors.
The “Gotcha” Rule	You must register for the CAT when you hit $750,000 in receipts.	Failing to register within 30 days of hitting this threshold incurs a $100/month penalty.
How much is it?	$250 + 0.57% on taxable commercial activity over $1 million.	You are allowed a 35% deduction for either your labor costs or your cost of goods sold.
When is it due?	Annual returns, plus quarterly estimated payments if liability exceeds $5,000.	Requires meticulous, year-round bookkeeping to avoid underpayment penalties.

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1. It is a Tax on Revenue, Not Profit

The most crucial thing to understand about the Oregon CAT is that it is a gross receipts tax, not an income tax.

Traditional income tax is based on your net profit (what’s left over after you deduct all your operating expenses). The CAT is based on your “commercial activity”—meaning the total amount of money your business brings in from Oregon customers. You can be operating at a net loss for the year and still owe the Corporate Activity Tax if your gross revenue is high enough.+1

2. The $1 Million Filing Threshold (and the $750k Trap)

You do not owe any money for the CAT until your Oregon-sourced gross receipts surpass $1 million for the year.

However, the Oregon Department of Revenue has a strict registration requirement that often catches business owners off guard. You are legally required to register for the CAT within 30 days of reaching $750,000 in Oregon commercial activity. If you wait until you hit the $1 million mark to notify the state, you will be hit with a failure-to-register penalty of $100 per month (up to $1,000). Proactive bookkeeping is the only way to track your revenue accurately enough to catch this $750k milestone in real-time.

3. How the Tax is Actually Calculated

If you cross the $1 million threshold, the math works like this:

• You pay a flat fee of $250.
• Plus 0.57% of your taxable commercial activity over $1 million.

Fortunately, the state doesn’t tax every single dollar. Before calculating the 0.57%, you are allowed to take a 35% deduction on either your Cost of Goods Sold (COGS) or your total labor costs (excluding compensation over $500,000 for any single employee)—whichever is higher.

Example: If your Oregon revenue is $2,000,000, and you claim a $300,000 deduction for labor, your “taxable” commercial activity is $1,700,000. Because you only pay tax on the amount over $1 million, you would be taxed 0.57% on $700,000.

4. Out-of-State Sales Don’t Count

The CAT is specifically designed to tax revenue generated from Oregon residents. If your Portland-based business sells products or services to customers in Washington, California, or anywhere else outside of Oregon, those receipts are excluded from your CAT calculation.

This is why having impeccably categorized books is vital. If your accounting software isn’t properly separating your revenue by state, you could end up drastically overpaying the Oregon Department of Revenue.

5. Quarterly Payments May Be Required

The CAT is an annual tax, but if you expect your total CAT liability to exceed $5,000 for the year, the state requires you to make quarterly estimated payments (due in April, July, October, and January). Missing these quarterly payments or underestimating them can result in additional interest and penalties.

Don’t Let Success Become a Liability

Hitting $1 million in revenue should be a moment to celebrate, not a reason to panic about compliance. Managing the nuances of the Oregon CAT—from monitoring the $750k registration threshold to maximizing your 35% cost subtraction—requires pristine, up-to-date financial records.

At Bridgetown Bookkeeping, we ensure your ledgers are perfectly organized year-round so you and your CPA can navigate Oregon’s complex tax landscape with total confidence.