Sole Proprietorship in Oregon (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

An Oregon sole proprietorship forms automatically when you start doing business - there is no state formation filing. If you use a business name, you register an assumed business name with the Oregon Secretary of State for $50, renewed every two years. Oregon has no sales tax, but your profits are taxed on your Oregon personal income tax return.

What Is a Sole Proprietorship in Oregon?

A sole proprietorship is an unincorporated business owned by one person, with no legal separation between the owner and the business. In Oregon it is the default structure for a single owner and forms automatically when you begin offering goods or services - there is no organizational filing with the Oregon Secretary of State. Because there is no separate entity, the owner is personally liable for all business debts.

The appeal is simplicity: no formation paperwork, no separate business income tax return, and minimal ongoing state filings. The trade-off is the absence of liability protection, which is why owners with meaningful risk often move to an LLC. For the national explainer, see what is a sole proprietorship.

Oregon still imposes obligations on sole proprietors - an assumed business name registration if you use a trade name, tax registrations if you hire, and any licenses your activity requires. The sections below walk through each so you can operate legally in Oregon, where the absence of a sales tax makes compliance simpler than in most states.

Do You Register an Oregon Sole Proprietorship?

You do not register the sole proprietorship structure itself with the state - the business legally exists as soon as you begin operating. The Oregon Secretary of State's Corporation Division handles formal entities like LLCs and corporations, not sole proprietors using their own name.

The one common state filing for a sole proprietor is the assumed business name, required if you operate under any name other than your own legal name. Unlike states that file DBAs at the county level, Oregon registers assumed business names at the state level with the Secretary of State, which is convenient because a single filing covers the whole state.

Beyond that, "no formation filing" does not mean "no obligations." You may still need tax registrations if you hire employees and profession-specific licenses depending on your field. See Oregon business licenses for activity-specific requirements, and the assumed name details below.

Registering an Assumed Business Name

If you do business under a name other than your own full legal name, Oregon requires you to register an assumed business name (Oregon's term for a DBA) with the Secretary of State. You can file online, and the registration fee is $50.

An Oregon assumed business name registration is valid for two years and must be renewed to stay active - a shorter cycle than some states, so calendar the renewal. The registration covers the whole state, and you list the counties (or all Oregon) where you will do business. Letting it lapse can free the name for others and disrupt your banking.

Registering an assumed business name does not create a separate legal entity or grant trademark rights; it simply records who is behind the business name. It is distinct from a trademark, which protects brand rights. For background, see the national DBA guide and the Oregon DBA page.

EIN and Federal Taxes

As a sole proprietor, you report business income and expenses on Schedule C (Form 1040), and the net profit flows to your personal Form 1040. You generally do not need an EIN if you have no employees and may use your Social Security number - but an EIN is required if you hire employees, file excise returns, or elect corporate taxation. The IRS issues EINs for free.

Because no employer withholds tax from your earnings, you typically pay quarterly estimated taxes. You also owe self-employment tax of 15.3% (12.4% Social Security up to the annual wage base, plus 2.9% Medicare) on net earnings, computed on Schedule SE, and you may deduct one-half of it when figuring adjusted gross income.

Many sole proprietors obtain an EIN even when not required, to keep the SSN private and to open a business bank account. See how to get an EIN in Oregon for the step-by-step. Clean books make both federal and Oregon filing far easier and lower your self-employment tax by capturing legitimate deductions.

Oregon State Taxes: No Sales Tax, but Income Tax

Oregon is one of a handful of states with no general sales tax, so a sole proprietor selling goods in Oregon does not collect sales tax on those sales. That removes a major compliance burden that most states impose. However, Oregon has a relatively high personal income tax with progressive brackets, and your business profits are taxed as personal income on your Oregon return.

You report business income on your Oregon personal income tax return filed with the Oregon Department of Revenue, and you may need to make estimated state payments if you expect to owe. If you have employees, you register for state income tax withholding and unemployment insurance, and Oregon has additional payroll-related taxes such as transit taxes.

Because Oregon rates and thresholds change, confirm current figures with the Department of Revenue. The absence of a sales tax simplifies operations, but the income tax means careful estimated-tax planning still matters. See business tax for how these pieces fit together.

Oregon Corporate Activity Tax and Local Rules

Oregon also imposes a Corporate Activity Tax (CAT), a tax on commercial activity (gross receipts) sourced to Oregon. Despite the name, it can apply to any business form, including sole proprietors - but only above a high threshold. Businesses with Oregon commercial activity at or below $1 million generally owe no CAT and may have no filing obligation, so most small sole proprietors are not affected.

If your receipts approach or exceed that threshold, review the Corporate Activity Tax rules, since registration and filing are required above the limit. The CAT is separate from the income tax on your profits and is based on receipts rather than net income.

Finally, some Oregon cities and counties - notably the Portland metro area - impose their own business taxes and licensing. Check local requirements for where you operate. Between the income tax, potential CAT, and local rules, Oregon's no-sales-tax simplicity is balanced by other obligations to track. See Oregon business licenses.

Closing an Oregon Sole Proprietorship

Closing a sole proprietorship is straightforward because there is no entity to dissolve with the Secretary of State. Still, wind down cleanly: stop operations, notify customers and creditors, and let your assumed business name lapse or cancel it so it does not renew and continue on the public record.

File final federal and Oregon returns, including final payroll and withholding returns if you had employees, and pay any remaining self-employment and estimated tax. If you were registered for the Corporate Activity Tax, file a final CAT return. Cancel any licenses and permits tied to the business.

If you obtained an EIN, you can ask the IRS to close the associated business account, though the number is never reassigned. Handling these steps prevents lingering tax notices and keeps your records clean. For general guidance, see the business dissolution guide.

Frequently Asked Questions

Do I have to register a sole proprietorship in Oregon?

You do not register the structure with the state. If you use a business name, you register an assumed business name with the Oregon Secretary of State for $50, renewed every two years, and register for tax accounts if you hire.

Does Oregon have a sales tax for sole proprietors?

No. Oregon has no general state sales tax, so sole proprietors do not collect sales tax on Oregon sales. However, Oregon does impose a personal income tax on business profits and, above $1 million in receipts, the Corporate Activity Tax.

How do I file a DBA in Oregon?

Register an assumed business name with the Oregon Secretary of State, which is done at the state level rather than by county. The fee is $50, and the registration is valid for two years before it must be renewed.

Do I need an EIN for an Oregon sole proprietorship?

Not if you have no employees; you may use your Social Security number. An EIN is required if you hire employees, file excise returns, or elect corporate taxation, and many owners get one to open a business bank account.

What is the Oregon Corporate Activity Tax?

The CAT is a tax on Oregon commercial activity (gross receipts). It applies only above a high threshold - businesses at or below $1 million in Oregon commercial activity generally owe no CAT, so most small sole proprietors are unaffected.

Related

• What Is a Sole Proprietorship? (cluster hub)
• What Is a DBA?
• How to Get an EIN
• Self-Employment Tax Calculator
• Sole Proprietorship in Washington (sibling)
• Sole Proprietorship in California (sibling)

Sources

1. Oregon Secretary of State - Register a Business (assumed business name).
2. Oregon Secretary of State - Find a Business (search).
3. Oregon Department of Revenue - Businesses.
4. Oregon Department of Revenue - Corporate Activity Tax (CAT).
5. Oregon Department of Revenue - Personal Income Tax.
6. Oregon Legislature - ORS Chapter 648 (Assumed Business Names).
7. IRS - Sole Proprietorships.
8. IRS - About Schedule C (Form 1040).
9. IRS - About Schedule SE (Form 1040).
10. IRS - Estimated Taxes.
11. IRS - Get an Employer Identification Number.
12. Cornell Law School Legal Information Institute - Sole Proprietorship.

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current requirements with the Oregon Secretary of State and the Oregon Department of Revenue before acting.