Oregon Small-Business Year-End Checklist: Records to Gather Before Tax Filing

Plan the close before asking for a tax appointment

Year-end preparation works best as a short sequence of decisions, not a single file upload. First identify which months are reconciled, what information is missing, and who can answer the questions. Then agree on a completion date with the bookkeeper and leave time for the preparer to review unusual transactions.

Make a one-page change log for the year. Include new owners, new locations, workers hired, equipment financed, accounts opened or closed, new sales channels, and changes to how the business is taxed. A return built from last year’s assumptions can miss a meaningful change even when the current-year totals look ordinary.

This checklist supports record gathering and scope planning. It does not replace a review of the business’s tax method, elections, or specific filing obligations.

Turn missing documents into an assigned work list

Use one row for each missing statement, receipt or unexplained transaction. Record the account and period, known amount, support already held, exact item requested, responsible person, follow-up date and unresolved decision. Link sensitive evidence through the agreed secure process rather than pasting identity details into the checklist.

For example, a card statement showing a parts supplier payment may establish an amount without explaining the items or business purpose. Request the invoice and preserve both records. Mark the item open until the reviewer resolves it; do not invent a receipt or deduction to make the close look complete.

• IRS: What kind of records should I keep?

Complete the bank, card, and sales reconciliations

Gather statements for every business bank account, credit card, loan, and payment platform used during the year, including accounts closed partway through it. Reconcile to the final statement and keep the reconciliation report. Explain unfamiliar transfers and review duplicates before treating the profit-and-loss report as complete.

Keep annual and monthly sales reports from processors or marketplaces. Compare gross sales, refunds, fees, and payout timing, then investigate differences with the ledger. A payment deposited in January may relate to earlier activity, so keep the underlying report and have the preparer apply the relevant accounting method rather than making a timing assumption.

For cash activity, record how sales and spending were tracked and disclose any gaps. An honest unresolved-items list is more useful than a spreadsheet that appears complete but cannot be supported.

• IRS: Recordkeeping

Review customer balances, supplier bills, and owner transactions

Produce customer and supplier balance lists even if the final tax reporting uses a different presentation. Mark disputed invoices, deposits, retainage, unapplied payments, and old balances needing explanation. Keep the contracts and correspondence that make those balances understandable.

Prepare a separate schedule of owner contributions, withdrawals, reimbursements, and loans. Reconcile it with the business accounts and include transactions paid personally for the business. Have the preparer confirm treatment instead of using a single miscellaneous category to make the books balance.

If inventory or significant supplies remain on hand, document the count or other process used and flag damaged or obsolete items. Avoid deciding tax treatment simply from the cash spent buying stock. The objective is an accurate factual record that supports the method selected for the business.

• IRS Publication 583: Starting a Business and Keeping Records

Reconcile payroll and organize contractor information

Collect payroll summaries, filed reports, payment confirmations, and any correction notices. Oregon directs employers through its payroll registration and reporting systems; the bookkeeper and payroll provider should agree on who owns each filing and reconciliation task. A payroll service subscription is not itself evidence that a return or payment was accepted.

Review employee names, addresses, work locations, benefit information, and year-end totals through a secure process. Keep contractor identity and payment records separately and ask the preparer to determine the applicable reporting obligations from current-year guidance. Resolve worker-classification questions on their facts rather than assuming that an invoice or payment label settles the issue.

The IRS requires retention of employment-tax records for at least four years. Put payroll evidence in a controlled archive and document who can access it; it should not be scattered across personal email threads.

• Oregon Department of Revenue: Starting Payroll Taxes in Oregon
• Oregon Independent Contractors: Employee or Independent Contractor?
• IRS: Employment Tax Recordkeeping

Check tax-year 2026 filing readiness and retain acceptance evidence

For tax-year 2026 forms filed during 2027, ask the provider which person prepares, approves and transmits each required return. As of October 20, 2026, the IRS describes FIRE’s retirement as planned and directs current FIRE users to transition to IRIS for that filing season. Use the IRS’s current transition timetable when confirming system availability with the transmitter.

Oregon’s current iWire notice describes 2026 format changes and a revised W-2 spreadsheet template; it says older spreadsheet versions cannot be used. SSA separately publishes tax-year 2026 W-2 and W-2c specifications. Have the provider check the current instructions for the actual form and submission route rather than reusing last year’s export.

Keep a separate evidence row for each entity, year, form and destination. Record the preparer, owner approver, transmitter, submission reference, processing status and correction owner. A prepared file or federal acknowledgment does not establish that a separate Oregon submission was accepted. Confirm whose filing access the provider uses; this checklist is not an instruction for every owner to create a new IRIS account.

• Source-document row: requested item, requester, evidence link and reviewer resolution.
• Federal information-return row: applicable IRS route, approved version and acknowledgment.
• W-2 wage-data row: applicable SSA route, accepted file reference and correction status.
• Oregon row: required iWire submission, state confirmation and remaining follow-up.

• IRS: Filing Information Returns Electronically, planned FIRE retirement
• IRS: E-file information returns with IRIS
• Oregon DOR: iWire, W-2 and 1099 reporting
• Social Security Administration: Tax-year 2026 W-2 and W-2c specifications

Build an asset and financing schedule

List equipment, computers, vehicles, furniture, and significant improvements acquired or disposed of during the year. Include the invoice, date available for business use, financing information, business-use details, and sale or trade-in documents. Keep the old asset record when something is replaced rather than deleting it from the file.

The IRS explains that property records support depreciation and the calculation of gain or loss on disposition. The preparer needs those facts before evaluating any deduction or election. Do not buy an asset merely to create a deduction without first considering the business need, cash cost, financing, and the tax treatment that actually applies.

• IRS: What Kind of Records Should I Keep?

Review Oregon programs and locations separately

Oregon’s Corporate Activity Tax can apply to different business forms, not just corporations. Its registration, return, and payment thresholds are separate, and its commercial-activity measure is not the same as net profit. If receipts have grown, flag CAT review before assuming the business remains outside the program.

Also review employee work locations and any transit-tax questions. The Statewide Transit Tax on covered wages is distinct from employer transit payroll programs and the transit self-employment tax. A list of where work occurred makes that discussion more useful than a total payroll number alone.

Oregon has no general sales tax, but its Department of Revenue cautions that out-of-state sales can create other states’ sales-tax obligations. Provide a state-by-state sales or delivery report when relevant. Do not assume that being based in Oregon eliminates a destination-state question.

• Oregon Department of Revenue: Corporate Activity Tax
• Oregon Department of Revenue: Statewide Transit Tax
• Oregon Department of Revenue: Transit Self-employment Taxes
• Oregon Department of Revenue: Sales Tax in Oregon

Add a local-tax review when business or residence connects to Portland

For Portland-area activity, keep a separate list of local business programs and potential owner-level returns. Location, tax entity, receipts, and residency can answer different questions. Ask for the applicable current-year guidance rather than using a threshold remembered from a prior return.

A practical review folder contains official notices, prior local returns, payment evidence, account identifiers, location schedules, and the reason each program was considered applicable or exempt. Ask who will handle each item before the federal/state engagement is finalized. A tax filing fee should be compared with the exact work included, not interpreted as a promise that every possible local or personal return is covered.

• Portland City Code: Chapter 7.02 Business License Law
• Portland Revenue Division: SHS and PFA Personal Income Taxes

Archive the evidence and hand over a short summary

Do not apply one disposal date to every business record. IRS retention guidance has different periods depending on the circumstances and says property records generally remain relevant through the limitation period for the disposal year. Other legal, insurance, lending, or state requirements may require longer retention. Set a policy with the appropriate advisers before deleting files.

Use an access-controlled archive with a consistent folder structure and backup. Keep a final copy of the reports actually used for preparation, plus the submitted returns, acceptance evidence, and payment confirmations. Preserve the explanation of adjustments so next year’s opening balances can be understood.

End the close with a one-page handoff: completed months, outstanding questions, major changes, reports supplied, filings in scope, and responsible people. That summary turns a pile of records into a workable starting point for the preparer and makes it easier for the owner to see what remains.

• Final profit-and-loss report, balance sheet, and reconciliation status.
• Sales, customer, supplier, payroll, and contractor schedules.
• Assets, financing, owner transactions, and activity by location.
• Prior returns, official notices, and payment confirmations.
• Written engagement scope and an agreed process for unresolved items.

• IRS: How Long Should I Keep Records?