Best Records for Self-Employed Oregonians to Keep (2026)

This list covers what to keep all year. For the taxes themselves (self-employment tax, quarterly estimates and the TriMet self-employment tax), the Oregon freelancer and gig worker tax guide is the full reference. For the documents to gather at filing time, use the tax document checklist.

Figures below are for tax year 2026, the return you file in spring 2027.

1. Business bank and card statements

Statements from an account used only for the business are the backbone of every other record on this list. They show every deposit and every payment in one place, and they make it possible to prove that a deposit was a loan, a transfer or a gift rather than income. Download them monthly; banks do not keep them online forever.

2. Every income record, whether or not a form arrives

Keep invoices, sales reports and payment-platform statements for all income. Forms from payers are a cross-check, not the full picture, and for 2026 fewer of them will arrive:

• Form 1099-NEC: for payments made in 2026, a client generally issues one only when it paid you $2,000 or more in the year.
• Form 1099-K: a payment platform issues one when your payments for goods or services exceed $20,000 in more than 200 transactions.
• The IRS is clear that you must report all business income whether or not you receive a form.

3. Receipts that say what was bought and why

A card statement shows that money left the account; a receipt shows what it bought. Keep receipts for supplies, software, subscriptions, professional fees and equipment, and add a note of the business purpose where it is not obvious. Business meals need the who and why written down, and are generally only 50% deductible.

4. A mileage log kept at the time

For vehicle expenses the IRS expects records kept "at or near the time" of each trip, showing date, destination, business purpose and miles, plus total miles for the year. In 2026 the log matters more than usual, because the business standard mileage rate changed mid-year:

5. Home office measurements and costs

The home office deduction requires space used regularly and exclusively for business. Record the square footage of the office and of the home, and keep rent or mortgage interest, utilities and insurance bills. The simplified method allows $5 per square foot, up to 300 square feet; the regular method uses actual costs, which is why the bills are worth keeping even if you expect to use the simplified rate.

6. Purchase records for equipment and other assets

Computers, vehicles, tools and furniture are depreciated or expensed, and the paperwork has to survive long after the purchase. Keep the invoice, the date placed in service and the business-use percentage. The IRS says records for property are kept until the limitation period ends for the year you sell or dispose of it, which can be many years away.

7. Proof of estimated tax payments

Keep confirmations for every federal and Oregon estimate, with the date paid and the tax year it was for. A payment applied to the wrong year can trigger a notice, and a confirmation number is the quickest way to settle it. For 2026 the dates are 15 April, 15 June and 15 September 2026, and 15 January 2027, for both the IRS and Oregon. The calculation side is on quarterly estimates.

8. Health insurance and retirement contributions

Premium statements support the self-employed health insurance deduction, and year-end statements from a SEP, SIMPLE IRA or solo 401(k) support the retirement deduction. Contributions for one year can sometimes be made in the next, so note which year each deposit was for. See best retirement accounts for small business owners.

9. W-9s for anyone you pay

If you hire other freelancers, collect a Form W-9 before you pay them. The IRS suggests keeping W-9s for four years. You will need the name and taxpayer identification number to file any Form 1099-NEC for 2026, due 1 February 2027 (31 January 2027 is a Sunday).

10. Filed returns, and a retention rule you follow

Keep a copy of every return you file, federal and Oregon, with the records that support it. The IRS retention periods:

• 3 years in most cases.
• 6 years if income was underreported by more than 25% of the gross income shown.
• 7 years if you claim a loss from worthless securities or a bad debt deduction.
• At least 4 years for employment tax records, if you have employees.
• Indefinitely if a return was never filed or was fraudulent.

If the books have fallen behind, catch-up bookkeeping rebuilds them from statements before a return is filed, which is far cheaper than rebuilding them in response to a letter. If a letter has already arrived, start with best ways to handle an IRS letter.