Business tax preparation checklist: what to give your tax preparer before filing

The fastest way to make tax preparation difficult is to treat the tax return as the first accounting close of the year. Before the preparer begins, every bank and credit-card account should be reconciled, material processor accounts should tie to settlements, payroll should agree to provider reports, debt should agree to lender statements, and owner or shareholder activity should be identified.

The tax professional will still make tax-specific adjustments and determine positions. The bookkeeping should make sure the financial record they receive is complete enough to do that work without reconstructing ordinary transactions.

Provide a final year-end profit and loss statement and balance sheet, preferably with prior-year comparison. Keep the underlying bank, card, processor, loan, payroll, receivable, payable, tax, and equity reconciliations available if the preparer needs support.

If you changed bookkeeping providers or accounting systems during the year, include the migration date and any opening-balance adjustments so the preparer knows how the history connects.

Give the preparer the prior federal and state business returns, extension filings, depreciation schedules, carryforward schedules, and any workpapers they did not prepare themselves. Include IRS or state notices received during the year and proof of payments or responses.

Prior returns establish tax elections and balances that may not be obvious from the current ledger. Do not assume a new preparer can infer them from this year's P&L.

Provide annual payroll registers, Forms W-2 and W-3, quarterly payroll-return support, and year-end employer reports. Reconcile wage expense and payroll-tax accounts in the books to the provider before sending the package.

For contractors and other reportable vendors, retain W-9s or appropriate foreign-status documentation and filed information returns. If 1099 preparation is still open, flag missing tax IDs or disputed vendor classifications early.

Prepare a schedule of equipment, computers, furniture, vehicles, leasehold improvements, and other material assets purchased or disposed of during the year. Include purchase date, cost, business use, disposal proceeds, and invoices where available.

Do not simply bury a major equipment purchase inside office expense. The tax preparer needs enough information to determine whether a cost is currently deductible, depreciated, amortized, or otherwise treated under the applicable rules.

Provide year-end loan statements and new financing agreements. Separate loan principal from interest and fees in the books. For corporations and venture-backed companies, keep stock financings, SAFEs, notes, founder loans, and other financing events tied to signed documents and the cap table.

If the business received debt forgiveness, grants, unusual credits, or other non-routine inflows, call them out rather than leaving the preparer to interpret the bank description.

Review contributions, distributions, draws, shareholder loans, guaranteed payments, reimbursements, and changes in ownership. The correct tax treatment depends on entity type and facts, so the bookkeeping should clearly identify what happened without trying to invent the tax conclusion.

For partnerships and S corporations, ownership changes and distributions can affect partner or shareholder reporting. Preserve dates and supporting documents.

List the states where the business was registered, had employees, maintained property, collected sales tax, or otherwise had filing activity. Include state income or franchise returns, sales-tax filings, payroll registrations, annual reports, and material notices.

A federal return alone does not tell the preparer the company's full operating footprint. Remote employees, new offices, and new sales channels are common reasons the state list changes from one year to the next.

Create a short memo for anything the preparer should not have to discover from the general ledger: acquisition or sale activity, major legal settlements, related-party transactions, equity compensation, asset sales, large charitable contributions, foreign activity, changes in accounting method, or material customer arrangements with unusual payment terms.

A five-sentence explanation can save hours of back-and-forth when the transaction is complex but the business context is obvious to the founder.

• Final P&L and balance sheet.
• Year-end reconciliations and supporting schedules.
• Prior returns, notices, and tax-payment confirmations.
• Payroll, W-2, 1099, and contractor documentation.
• Fixed-asset additions and disposals.
• Debt and financing documents.
• Owner, partner, and shareholder activity schedule.
• State and local filing summary.
• Short memo for unusual transactions and unresolved questions.

After the return is complete, post the final tax adjustments to the books, save the filed return and depreciation or carryforward schedules, and confirm that next year's opening balances agree to the final tax-adjusted record where appropriate.

Institution's bookkeeping and tax-preparation model is built around this loop: close the books throughout the year, hand off one organized record for filing, then bring the final tax work back into the operating record so the next period starts cleanly.