Excite Tax's answer for Utah owners: keep most records 3 years after filing, payroll records 4 and bad-debt records 7 (IRS Publication 583).
Excite Tax's short answer: 3 years after the return is filed in the ordinary case, 6 years if income left off the return is more than 25% of the gross income shown, and no limit if no return was filed or it was fraudulent. Payroll records stay at least 4 years after the tax is due or paid, whichever is later, and records for equipment, vehicles and buildings stay until the period runs out for the year you sell or dispose of them. The full table is below.
Excite Tax's answer is two layers: the books, which must show gross income, deductions and credits, and the documents behind every entry: deposit slips and invoices for income, receipts and statements for expenses, purchase and sale papers for assets, and payroll records. The law lets you choose any system that clearly shows income and expenses; it does not let you skip the documents. The list is below.
The IRS does not publish a list of bookkeeping red flags, and Excite Tax will not invent one. What it does say is that returns are compared by formula with norms for similar returns, and that a return can be pulled because a partner's or investor's return was. A figure far from what similar businesses report, with no document behind it, is what that comparison is built to surface. More below.
Each expense needs a document that shows the payee, the amount, proof of payment, the date and what was bought. A bank or card statement proves payment, but proof of payment alone does not establish a deduction, so the receipt or invoice stays too. Travel, gifts and vehicles have their own substantiation rules. Details are below.
No IRS statement says a miscellaneous line triggers an audit. The form itself does not allow a lump: on a sole proprietor's return, each other expense is listed separately by type and amount. Excite Tax's view is that an oversized, vague catch-all is the entry an examiner asks about first, because a mail audit asks for more information about specific expenses. See the miscellaneous line.
The clock is the period of limitations: the time the IRS has to assess more tax and you have to claim a refund. The records that support a return live as long as that return can still change. The periods below are the ones IRS Publication 583 sets out in its Table 3, plus the payroll and property rules beside it.
Federal retention periods for business records
| Situation | Keep the records |
|---|---|
| The ordinary case: a return was filed and nothing below applies | 3 years after filing |
| You claim a credit or refund after filing | 3 years from filing or 2 years from paying the tax, whichever is later |
| Income left off the return is more than a quarter of the gross income shown | 6 years |
| A loss from worthless securities or a bad-debt deduction | 7 years |
| No return was filed, or the return was fraudulent | No limit |
| Payroll and other employment tax records | At least 4 years after the tax is due or paid, whichever is later |
| Records of employee retention credit wages paid after mid-2021 | At least 7 years |
| Equipment, vehicles, buildings and other property | Until the period runs out for the year you sell or otherwise dispose of it |
| Copies of the filed returns themselves | Keep them; the next return and any amendment are built from them |
Two details move the dates. The years run from filing, but a return filed early counts as filed on its due date, so filing in February does not start the clock in February. And the tax deadline is the floor, not the ceiling: a lender or insurer may want the records longer than the IRS does, so check a loan agreement before shredding anything.
The rule starts in the Internal Revenue Code: every person liable for tax must keep the records the IRS prescribes. The IRS does not prescribe a format. Any system that clearly shows income and expenses will do, from a spreadsheet to accounting software, provided the books show gross income, deductions and credits and a document stands behind each entry.
Employers keep all employment tax records for at least 4 years, available for IRS review. A payroll provider holds much of this, but the employer is the one who must be able to produce it. Publication 15 lists what the file should hold, including:
One exception runs longer: records for employee retention credit wages paid after June 30, 2021 stay at least 7 years. A business that claimed that credit should not apply the ordinary payroll period to that file. Payroll corrections are covered in fixing payroll tax mistakes.
The return is a summary of the books, and the IRS expects the two to be the same records: the records must support the income, expenses and credits reported, and are generally the same ones used to run the business. That is the whole of IRS compliance bookkeeping. Nothing is kept for the IRS that the business should not already keep for itself; what changes is how long it is kept and whether each entry can be traced to a document.
Excite Tax's own rule of thumb follows from it: if a number on the return cannot be traced to the books, and the books cannot be traced to a statement or receipt, that number is the weak point, whatever it is.
A deduction needs two things on paper: that the money left the business, and what it bought. The IRS asks that supporting documents show the payee, the amount paid, proof of payment, the date incurred and a description showing it was a business expense. One document rarely does all of that, so most expenses carry a pair: the statement and the receipt.
Statements can stand in for canceled checks. A highly legible account statement may prove payment if it shows the amount, the payee's name and the posting or transaction date, plus the check number for a check. It still proves only the payment: proof of payment, by itself, does not establish a deduction. For example, a $1,450 card charge to an office-supply store proves money left, but only a description of the item shows whether it was printer toner for the office or a television for the house.
Keep the business's spending in its own account, as Publication 583 advises, and most of the proof sorts itself; see personal bank accounts for business. Whether a paper receipt must be kept at all is covered in do I need to keep receipts.
Digital is fine, with conditions. Every requirement for paper books and records also applies to electronic storage, and paper originals may be destroyed only after the electronic system has been tested to reproduce them to IRS requirements, under Revenue Procedure 97-22. In practice: scans must be legible, indexed so a given receipt can be found, and backed up somewhere that outlives a laptop.
No record keeping makes a return audit-proof; a return can be picked at random. Excite Tax aims instead for audit-ready books: books that answer an examiner's questions the first time. The IRS puts the stakes plainly: records must be available at all times for inspection, and a complete set speeds up an examination.
Behind on any of this? Two years behind on bookkeeping covers the catch-up, and common bookkeeping mistakes covers the errors that make books hard to defend.
Lists of audit triggers circulate widely, and the IRS itself publishes none of them. What the IRS does publish is how it selects returns, and that is enough to reason from.
Excite Tax's reading, and it is a reading rather than an IRS statement: if returns are compared with norms, the bookkeeping problems that matter are the ones that push a figure away from what similar businesses report. Personal spending booked as expense, sales deposited but never recorded, and a car claimed at full business use all do that. Clean books do not stop a return being selected; they make the examination short.
On a sole proprietor's Schedule C, each other expense is listed separately by type and amount, and personal, living and family expenses do not belong there. So a single catch-all figure is not an option on that form, and a long list of small, vague items reads worse than a few clear ones. Excite Tax's advice is to book each cost to the account that names it, and to treat anything left in miscellaneous at year-end as a question to answer before the return, not after a letter.
Utah's own clock is similar to the federal one. Under Utah law the Tax Commission assesses within three years after a return is filed, and at any time when no return is filed or a false or fraudulent return is filed with intent to evade. Excite Tax's advice for Utah owners is to keep the federal schedule above, since the federal periods for payroll, property and bad debts run at least as long, and to keep sales-tax and withholding records on the same shelf as the federal ones.
Yes, if the scanned system meets IRS requirements. Originals may be destroyed once the electronic system is tested to reproduce them to IRS requirements, and the scans are subject to every rule that applies to paper.
Then the records have no end date, because the period never starts. File the missing return; the IRS asks that every return due be filed, whether or not you can pay in full.
Sometimes. An insurer or creditor may require them to be kept longer, and asset records outlast the ordinary period because they run until the year of sale is closed.
Hand the books over when keeping them costs more hours than the business can spare, or when they stop agreeing with the bank.
Excite Tax keeps these books; the return they feed is reviewed and signed by a licensed CPA at TBD CPA LLC.
Ranked and explained on the sources page.