What LLC formation in Oregon actually involves
The legal side starts with the Oregon Secretary of State. You file articles of organization with the Corporation Division, your company appears in the Oregon Business Registry, and from then on the LLC renews its registration with the state every year. If you plan to trade under a name that is different from the legal name of the LLC, Oregon also has an assumed business name registration.
That state filing creates the company. It does not give you a tax ID, it does not choose how the IRS will tax you, and it does not register you with the City of Portland or Multnomah County. Those steps are separate, and they are where most new owners lose time or money.
Plenty of people file the articles online in an evening and only call an accountant when tax season comes around. By then the first year is already set. Talking to a CPA before or right after you file lets you make the tax decisions on purpose instead of by default.
LLC or S corp: choosing how the IRS taxes your company
An LLC is a creature of state law. The IRS does not have a separate LLC tax return, so your LLC is taxed under one of the existing federal systems. Many single member LLCs are treated as disregarded entities, which means the IRS looks straight through the company to you as the owner. An LLC can also choose to be taxed as an S corporation.
The S corp election is made on IRS Form 2553. The IRS instructions say the form is due no more than 2 months and 15 days after the beginning of the tax year the election is meant to cover, or at any time during the tax year before that. An LLC that qualifies and files Form 2553 is treated as a corporation from the effective date of the election and does not also need to file Form 8832.
Not every company can elect. The IRS rules require no more than 100 shareholders, only one class of stock, and a domestic corporation or a domestic entity that is eligible to be treated as a corporation. Missing the deadline is not always fatal. The IRS offers late election relief in some cases, and for eligible entities that request has to be made within 3 years and 75 days of the intended effective date.
Whether an S corp makes sense depends on your profit, how you pay yourself, and what payroll will cost to run. A CPA will look at your real numbers, not a rule of thumb, and tell you if the election is worth it this year or later.
What is included
- Advice on LLC, S corp or other structure before you file
- Review of your Oregon articles of organization plan
- Help with the IRS Form 2553 S corp election and its deadline
- Guidance on applying for an EIN directly with the IRS
- City of Portland and Multnomah County business tax registration
- A first year tax plan covering federal, Oregon and Portland taxes
- Bookkeeping setup so year one records are clean
Getting your EIN without paying a middleman
An EIN, or employer identification number, is the federal tax ID for your business. Banks ask for it, payroll needs it, and clients who send you a 1099-NEC will want it on your W-9.
You can apply directly on irs.gov. The IRS says plainly that you never have to pay a fee for an EIN, and it warns people to beware of websites that charge for one. If the online application is approved, the EIN is issued right away.
Your CPA can walk you through the application questions, since the answers you give about the type of entity and the reason for applying should line up with the tax setup you chose.
Registering with the City of Portland and Multnomah County
This is the step new owners most often miss. The City of Portland Revenue Division says businesses operating in the City or County must register within 60 days. That rule covers a lot of people who do not think of themselves as a business, including rideshare drivers and people who own or rent out property in the area.
Registration and owing tax are two different things. For tax years beginning before 1/1/2026, businesses with gross receipts under $50,000 from all business activity were exempt from the City of Portland Business License Tax. The City lists that exemption at $75,000 for tax years beginning in 2026 and $100,000 for tax years beginning on or after 1/1/2027. The Multnomah County Business Income Tax exemption is gross receipts under $100,000.
For tax year 2025, the City tax rate is 2.6% and the County rate is 2%, and both are reported on one combined return. A deduction for owner compensation can take a large bite out of the taxable amount for many small companies. Our page on Portland local taxes covers the details.
Oregon taxes to plan for in your first years
Oregon does not tax most small companies on sales volume, but the Corporate Activity Tax, or CAT, starts to matter as you grow. The Oregon Department of Revenue says a business must register for the CAT within 30 days of reaching $750,000 in Oregon commercial activity for the year, and a return is required once commercial activity passes $1 million.
Larger companies can also run into the Metro Supportive Housing Services business income tax, which applies to businesses with more than $5 million in gross receipts. Sole proprietors are not liable for that business tax, though they may owe the Metro personal income tax instead if their income is high enough.
None of this needs to be solved on day one. It does help to know where the lines are so your bookkeeping tracks the right numbers from the start.
How the CPA you are matched with will help
Each request goes to a licensed CPA in our Portland area network who handles new business setup. They will ask what you do, who owns the company, how much you expect to earn in year one, and whether you plan to hire.
From there they can tell you which filings to make and in what order, whether to elect S corp status now or wait, and what to set aside for federal, Oregon and Portland taxes. If you already formed the LLC and skipped a step, they can help you catch up.
Tell us what you need and a licensed CPA who works with people like you gets in touch with a clear, fixed quote.
Who this suits
- Freelancers and consultants turning a side business into an LLC
- Contractors and trades starting a company in the Portland area
- Owners of an existing LLC thinking about an S corp election
- Partners starting a multi member business together
- Anyone who formed an LLC online and skipped the tax setup
Common questions
Do I need a CPA to form an LLC in Oregon?
No. You can file articles of organization with the Oregon Secretary of State yourself. A CPA helps with the tax decisions that come after, such as an S corp election, your EIN, and City of Portland registration.
When is the deadline to elect S corp status?
The IRS says Form 2553 is due no more than 2 months and 15 days after the start of the tax year the election should take effect, or at any time during the year before. Late election relief is possible in some cases.
Does an Oregon LLC have to renew every year?
Yes. Oregon LLCs renew their registration with the Secretary of State each year to stay active in the Oregon Business Registry.
Do I have to pay to get an EIN?
No. The IRS issues EINs for free on irs.gov and warns people about websites that charge a fee for one.
Do I need to register with the City of Portland if I work from home?
If you do business in the City of Portland or Multnomah County, the Revenue Division says you must register within 60 days. Registering does not always mean you owe tax, because small businesses under the gross receipts thresholds are exempt.
Is an S corp always better than a regular LLC?
No. It depends on your profit, how you pay yourself and the cost of running payroll. A CPA can run the numbers for your situation and tell you if it is worth doing now or later.
What happens to my taxes if my business grows past $750,000 in Oregon sales?
The Oregon Department of Revenue requires CAT registration within 30 days of reaching $750,000 in Oregon commercial activity for the year. A CAT return is required once you pass $1 million.