How Long Do You Have to Keep Your Day Count Records?

How long do you have to keep your day count records?

Keep them until the IRS runs out of time to assess tax on the return that relied on them. For most returns that is three years after the return was filed, but three situations make it longer. The IRS tells taxpayers to keep records "until the period of limitations expires for that return" in Topic no. 305, Recordkeeping.

That rule comes from the tax code's limit on assessment, 26 USC 6501. Publication 570 supplies the residency framing: what a day is, and which tests your days feed. Neither document sets a separate retention period just for day logs. The rest of this guide shows how that limit works and how to apply it to your own years.

What is the default retention window?

The default window is three years from the date the return was filed. Section 6501(a) says tax must be assessed within 3 years after the return was filed. That is the assessment period, and it is the clock your records need to outlast.

Two timing details matter.

• An early return is treated as filed on its due date, so the clock does not start sooner because you filed in February.
• A late return starts the clock when the IRS receives it.

Those are the IRS's own descriptions, in Topic no. 305 and its page on the time the IRS can assess tax.

Take a 2024 return filed on April 10, 2025, ahead of an April 15 due date. The clock starts on the due date. Your 2024 day count records need to last three years past that date, at a minimum.

When is the period six years?

The period is six years when you leave out more than 25% of the gross income stated on your return. Section 6501(e)(1) lets the IRS assess within 6 years after the return was filed in that case. Topic 305 repeats the 25% trigger.

This rule is about omitted income, not about residency days. Published guidance does not tie a day count error to this rule directly. If a residency position on your return affects what income you report, whether the 25% line applies is a question for your advisor, not a conclusion to draw from a day log.

Is there ever no time limit?

Yes. There is no deadline for assessment in two cases:

• No return filed. Under section 6501(c)(3), if a return is not filed, the tax may be assessed at any time.
• A false or fraudulent return. Under section 6501(c)(1), a return filed with intent to evade tax can be assessed at any time.

Topic 305 says the same: there is no period of limitations when you file a fraudulent return or do not file a valid return.

For residency, the first case can matter in a practical way. A year with no valid filing never starts the clock, so records for that year have no natural expiry date. Whether a filing was required for your situation is a question for a licensed tax professional.

Can the period be extended?

Yes, by written agreement. Section 6501(c)(4)(A) allows the IRS and the taxpayer to consent in writing to assessment after the normal period, as long as the agreement is made before that period expires. Later written agreements can extend it again, provided each is made before the prior period ends.

So if you ever sign an extension for a year, the date you keep that year's records until moves too. Write the new date next to the year in your files.

What counts as day count records?

Your day count records are the documents and logs that show where you were on each day of a taxable year. Residency is tested year by year, which is why the records are kept year by year. The presence test, the tax home test and the closer connection test in 26 CFR 1.937-1 are each applied to the taxable year, and the 183-day figure is a count within one tax year.

Publication 570 counts a day as a day in a place if you are physically there at any time during that day. The rules for which days count are covered in what counts as a day in Puerto Rico.

Publication 570 also shows what the IRS expects when it asks. For days spent outside the territory for qualifying medical treatment, you must prepare or obtain and maintain documentation, and be able to produce it within 30 days if the IRS or the territory's tax administrator requests it. That passage is about medical days, but it shows the general posture: records are expected to exist and be produced on request.

In practice a day log is only as good as the evidence behind it. A contemporaneous day log is stronger than one written later, and the full set of supporting evidence is covered in documenting your presence for an audit. Keep the log and the supporting evidence for the same period. Pub 570 does not say how long to keep each type of supporting record, so treat them as part of the same file for the year.

How do you decide how long to keep a given year?

Use a short rule, year by year:

1. Find the date the return for that year was filed (or its due date, if you filed early).
2. Add three years. That is your minimum.
3. Mark the year for longer retention if any of the extended cases might apply: you may have left out a large share of income, you did not file, or you signed a written extension.
4. If you are unsure whether step 3 applies, ask your advisor and keep the year's records until you get an answer.

One more point, so the clocks don't get confused. The time the IRS has to collect tax once it is assessed is a separate period. The IRS describes it separately from the assessment window, and it is not the retention rule.

Here is what stays unsettled. No source reviewed for this guide states a retention period specific to Puerto Rico day count records. The three-year default is the assessment period that governs the return, applied by following the IRS's general advice to keep records until the period of limitations expires. If you are missing a year already, see reconstructing a year you did not document.

Tools like One83 can keep the log and the evidence for each year in one place, which makes this year-by-year rule easier to follow. The retention decision itself still belongs to you and your advisor.

Bottom line

Keep each year's day count records and the evidence behind them until the period of limitations for that year's return expires. Three years from filing is the default under section 6501(a). Six years applies to a large omission of income, there is no limit for a missing or fraudulent return, and a written extension moves the date. Because published guidance does not address day logs separately, confirm the period for each year with a licensed tax professional.

Frequently Asked Questions

Is three years always enough for day count records?

Three years from filing is the default assessment period under section 6501(a), but it is not a safe answer for every year. Six years applies where more than 25% of gross income is omitted, there is no limit with no return or a fraudulent return, and a written agreement can extend the period. Your advisor can tell you which applies.

When does the clock start?

Section 6501(a) runs it from the date the return was filed. The IRS adds that an early return is treated as filed on the due date, and a late return starts the clock when the IRS receives it.

Do I need to keep records if I never filed a return for a year?

The IRS says there is no limitation period when no valid return is filed, so the clock never starts for that year. Whether and how to file is a question for your advisor.

Does the IRS collection period mean I should keep records for longer?

No. Collection is a separate period that applies after tax is assessed. Record retention follows the assessment period, according to IRS guidance.

One83 is a tracking tool, not tax advice. Consult a licensed tax professional about your situation.