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Business Tax Return Checklist: Document Requirements

CPA and Business Owner Resource

Prepare business tax returns with our document checklist. For CPAs, enrolled agents, bookkeepers, and business owners filing corporate, partnership, or disregarded-entity returns. Gather books, bank statements, fixed asset reports, loan docs, prior-year returns, and owner information so organizers are complete and filing season stays on schedule. Pair with entity-specific checklists (1120, 1120S, 1065, Schedule C) as needed. Confirm current IRS forms. Not tax advice.

Business Tax Return Checklist: Document Requirements form template preview

Key Benefits

Complete a CPA tax organizer the first time
Reconcile books to bank and credit card statements
Capture fixed assets, loans, and owner draws
Attach prior-year returns and extension payments
Reduce PBC follow-ups during busy season
Works across C-corp, S-corp, partnership, and sole prop

Common Use Cases

CPAs collecting client documents for business returnsBookkeepers closing books before tax handoffBusiness owners self-organizing for their preparerFirms standardizing intake across entity typesNew clients migrating from another tax preparerYear-end cleanup before estimated tax and filing

Frequently Asked Questions

Which business tax return do I file?
It depends on entity type: Form 1120 (C corporation), Form 1120-S (S corporation), Form 1065 (partnership), Schedule C with Form 1040 (sole prop / disregarded LLC), or other forms for specialized entities. Your CPA confirms the correct return and elections.
What accounting records are essential?
A year-end trial balance or P&L and balance sheet, general ledger detail for material accounts, bank and credit card reconciliations, and support for large or unusual transactions. Clean books cut tax prep time and fee surprises.
Do I need last year’s return?
Yes. Preparers use the prior return for opening balances, depreciation schedules, loss carryovers, estimated payments, and e-file details. Include extensions and any amended returns.
What about owner information?
Provide ownership percentages, SSNs/EINs as required, addresses, and basis or capital account data for pass-through entities. Changes in ownership during the year need dates and documentation.

Checklist

Tax History

Prior-year business tax return and extension / payment records
Required

Include federal and state. Note carryovers and estimated payments applied.

Books

Year-end P&L, balance sheet, and trial balance
Required

Should match the books delivered to the preparer. Flag cash vs accrual method.

Bank and credit card statements with year-end reconciliations
Required

All business accounts. Include PayPal/Stripe or similar if material.

Assets

Fixed asset additions, disposals, and depreciation schedule
Required

Invoices for purchases; sale docs for disposals. Note §179 / bonus elections intent.

Liabilities

Business loan and line-of-credit year-end statements
Required

Interest paid, new borrowings, and related-party loans.

Compensation

Payroll summaries, Forms W-2/W-3, and 1099 drafts or totals
Required

Officer compensation for S corps is often scrutinized. Include contractor 1099-NEC data.

Owners

Ownership list with percentages, addresses, and TINs as required
Required

Document mid-year ownership changes with dates and agreements.

Deductions

Support for meals, vehicle, and home-office deductions if claimed

Mileage logs, square footage, and receipts. Rules vary by entity and year.