Bookkeeping for a Tiny Business: The Honest Minimum

Updated August 7, 2026. Quick answer: the IRS does not require you to buy anything. In its own words, “Except in a few cases, the law does not require any special kind of records” and “You may choose any recordkeeping system suited to your business that clearly shows your income and expenses.” A separate bank account and a spreadsheet clear that bar for a one-person business. Software earns its money when the volume of transactions makes a spreadsheet error-prone — not before, and not because a subscription page said so.

The actual standard, in the IRS’s words

The requirement is a purpose, not a product: your records must clearly show your income and expenses. The IRS also states the retention principle plainly — “You must keep your records as long as needed to prove the income or deductions on a tax return” — and then publishes actual periods, which is the part worth pinning up.

How long to keep things

From the IRS’s own period-of-limitations table, quoted:

• “Keep records for 3 years” in the ordinary case.
• “Keep records for 3 years from the date you filed your original return or 2 years from the date you paid the tax, whichever is later” if you file a claim for credit or refund after filing.
• “Keep records for 7 years” for a claim for a loss from worthless securities or a bad debt deduction.
• “Keep records for 6 years” if you do not report income you should have and it is more than 25% of the gross income shown on the return.
• “Keep records indefinitely” if you do not file a return, and again if you file a fraudulent one.
• “Keep employment tax records for at least 4 years” after the tax becomes due or is paid, whichever is later.

Read the shape of that list rather than memorising it. Three years is the ordinary answer; the longer periods exist because the clock is tied to what is on the return, not to the calendar. The practical consequence is that “keep everything for seven years” is a fine rule of thumb precisely because it is more conservative than the rule.

The honest minimum for a one-person business

1. One business account, with everything running through it. This is doing most of the work — and it is protecting more than your bookkeeping.
2. A spreadsheet with one row per transaction: date, amount, who, what it was for, and which category. That is a recordkeeping system by the standard quoted above.
3. Receipts kept in one place, digital or physical, named so you can find them by date. The discipline that fails is not the filing — it is the fifteen-month-old receipt you meant to file.
4. A quarterly hour to reconcile the spreadsheet against the statement. Doing it four times a year is not four times the work of doing it once; it is less, because you still remember what things were.

When software genuinely earns its fee

Not at the beginning. It earns it when one of these is true: you invoice enough clients that chasing payment by hand is a job; you have inventory; you have employees or regular contractors; you take payments through more than one processor and have to reconcile them; or your accountant charges you more to untangle a spreadsheet than the subscription costs. We name none, take nothing from any of them, and note only that the honest test is a specific job you are doing by hand and would stop doing.

The same test applies to the accountant. The once-a-year model — you keep the records, they prepare the return — is inexpensive and adequate for most one-person businesses. It stops being adequate at the point where a decision has tax consequences you cannot see, which is usually entity choice, hiring, or a year with an unusual event in it.

Sources and limits

Quotations read 2026-08-07 from the IRS’s Recordkeeping page and How long should I keep records. The IRS also publishes Publication 583 on starting a business and keeping records; we did not read it directly, so the quotations above are from the web pages rather than the publication. Retention periods are the IRS’s and can change. State and industry recordkeeping requirements are separate from the federal ones and are not covered here.