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You don't really need to "keep" records specifically for an audit - you should be keeping them anyway as part of normal business operations. The IRS wants to see receipts, invoices, bank statements, payroll records, expense documentation, and anything that backs up what's on your tax return. If you've got organized files showing income, deductible expenses, and how you calculated things, you're in solid shape if they ever come knocking.
Are you asking what to keep on hand, or how to actually organize it so you can find stuff fast when the IRS shows up?
The basics people mention are solid - receipts, invoices, bank statements, expense records, payroll docs if you have employees. But here's the thing: the IRS audit isn't really about having some magical folder of "audit documents." They're checking whether your tax return matches reality, so they want to see the same records you'd need to run your business normally. Mileage logs, credit card statements, supplier invoices, payment records - whatever shows where money came in and went out. Keep anything that supports a deduction or income item you claimed.
The practical thing most folks miss: organize by *category and month* as you go, not by document type. Don't pile all receipts in one box and invoices in another. Instead, group them like "January rent," "January supplies," "February meals," etc. When an auditor asks "show me your utilities for Q2," you're not digging through twelve months of mixed-up papers. Digital is way easier for this - snap photos of receipts and file them into folders on your computer or cloud storage the same day. If you wait until audit season, you'll be a mess.
Also keep records for at least three years, though the IRS can go back longer if they smell something fishy. That's just standard practice.
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