The short answer is everything related to money coming in and money going out. Sales receipts, vendor invoices, bank statements, inventory counts, payroll documents, and tax filings. The longer answer is knowing which records matter most and how long to keep them.

Daily sales records are the foundation. Keep POS system reports that show daily totals, payment types, returns, and discounts. Credit card batch reports and cash drawer reconciliations. If you offer layaway or store credit, keep records of those balances too. These records should match what hits your bank account and form the basis of your revenue tracking.

Inventory records matter more in retail than almost any other business type. Keep purchase orders, receiving documents, and vendor invoices for every shipment. Maintain records of inventory counts, shrinkage adjustments, damaged goods, and markdowns. Your cost of goods sold calculation depends on accurate inventory records, and that directly affects your tax liability and your understanding of gross margin.

Vendor and purchase records include every invoice you receive and proof of payment. When you pay a bill, keep the invoice and the payment record together. Credit card statements and bank records show payments happened, but invoices show what you paid for and whether the amount was correct. This also helps you catch duplicate charges or billing errors.

Banking records are non-negotiable. Monthly bank statements, deposit records, and reconciliation reports. Keep any loan documents, lines of credit agreements, and records of owner contributions or draws. Your bank statement is the anchor that everything else ties back to during monthly reconciliation.

Payroll records matter if you have employees. Timesheets or time clock reports, pay stubs, W-4 forms, I-9 forms, and records of benefits. Keep quarterly payroll tax filings and year-end W-2s. Arizona requires specific employment records, and the IRS has its own requirements for how long payroll records must be retained.

Tax records include sales tax returns, income tax returns, and all supporting documentation. Every deduction you claim should have a receipt or invoice to back it up. Arizona Department of Revenue and the IRS both have audit windows that extend several years, so these records need to stick around.

Retention periods vary by record type. The IRS generally recommends keeping tax returns and supporting documents for at least three years from the filing date, but seven years is safer if you want to cover yourself for any situation. Payroll records typically need six years. Inventory records should match your tax return retention at minimum. When in doubt, keep it longer.

Organization matters as much as retention. A box of random receipts doesn’t help if you can’t find what you need during an audit or when your accountant asks questions. Digital copies are fine and often better since they’re searchable and don’t fade. Use consistent naming and filing so anyone can find a document without asking you.

The common mistake retail store owners make is keeping some records but not others, or keeping everything but in complete chaos. Your small business bookkeeping is only as reliable as the source documents behind it. Clean books depend on having documentation to support every number.

If you’re unsure whether your records are complete, start with your bank statements and work backward. Every deposit should trace to sales records. Every payment should trace to an invoice or receipt. Gaps in that chain mean gaps in your records that need to be addressed before they become problems at tax time or during an audit.