The IRS requires you to keep records that support every number on your tax return. If you claim a deduction, you need documentation proving the expense happened, what it was for, and how much you paid. If you report income, you need records showing where it came from. The standard is that your records should be good enough for someone else to verify your return without relying on your memory.

Income documentation includes invoices you sent, contracts with clients, 1099s received, bank deposit records, and any reports from payment processors or point-of-sale systems. For businesses with cash transactions, a daily log or register tape matters because deposits alone don’t show the full picture.

Expense records need to show the amount, date, payee, and business purpose. Receipts are the gold standard, but bank and credit card statements work for many expenses if the purpose is clear. Meals and travel require more detail. You need to document who you met with, the business relationship, and what was discussed. A credit card charge at a restaurant with no context won’t survive an audit.

Keep all bank and credit card statements. These create a paper trail connecting your books to actual money movement. Reconciled statements prove your reported income matches deposits and your expenses match payments. Controller-level oversight typically includes reviewing these reconciliations monthly to catch discrepancies before they become problems at year end.

Payroll records deserve special attention. Keep W-4s, I-9s, time records, pay stubs, and all tax filings including 941s and state withholding returns. Payroll issues can trigger penalties years later, so these records need longer retention than most.

Asset records for equipment, vehicles, and property should be kept for as long as you own the asset plus seven years after you sell or dispose of it. You need purchase documentation, depreciation schedules, and records of any improvements. When you eventually sell, calculating gain or loss requires knowing your original basis.

Corporate documents like formation papers, operating agreements, meeting minutes, and ownership changes should be kept permanently. These aren’t strictly tax records, but they support ownership structure and entity status questions that can affect tax treatment.

The general rule is three years for most records because the IRS typically has three years to audit a return. However, if you underreport income by more than 25%, the window extends to six years. For fraud, there’s no limit. Keeping records for seven years covers most scenarios without requiring permanent storage of everything.

Digital records are acceptable. Scanned receipts and electronic statements have the same validity as paper if they’re legible and backed up properly. The goal is being able to produce records if asked, not maintaining filing cabinets full of paper.

The real challenge isn’t knowing what to keep. It’s building a system that captures records consistently throughout the year. Controller services in Boca Raton can help establish processes so record-keeping happens automatically rather than becoming a scramble at tax time or during an audit notice.