Atualizado 11 de outubro de 2026

Reconstructing a Year You Did Not Document: What Can Be Rebuilt and What Cannot

If you kept no day log for a Puerto Rico residency year, you can still rebuild much of the count from airline, card, phone, lease and utility records. Each day needs an anchor you can point to, and some days will not have one. This guide covers what the regulation requires, which third party records help, what cannot be rebuilt, and when a weak year belongs in front of a licensed tax professional before you file.

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Accordion file box with papers in kraft pockets on a wooden desk, a way to sort records

Can you reconstruct a Puerto Rico day count after the year is over?

Partly. You can rebuild many of your days from records that other people kept, such as airlines, banks, phone carriers and landlords. Days with no independent anchor stay weak, and published guidance does not say how much reconstruction is enough. This page covers what can be rebuilt, what cannot, and the point where the honest answer is that the year needs an advisor.

A log kept as you went would put you in a better position. Without one, you are where most readers are when they find this site. The job is to build the best record the facts allow, label its gaps honestly, and get a licensed tax professional to look at it.

What does the year have to show?

The presence test is one of three tests, and a day count answers only the first. Publication 570 and 26 CFR section 1.937-1 set out all three.

The presence test is met in one of several ways. The main ones are:

at least 183 days in Puerto Rico during the tax year
at least 549 days over the current and two prior years, with at least 60 days in Puerto Rico in each of those years
no more than 90 days in the United States during the tax year

A day counts when you are physically present in Puerto Rico at any time during that day. That means every day needs a location answer, not only the days you traveled. For the full counting mechanics, see what counts as a day in Puerto Rico.

The tax home test is met when you had no tax home outside Puerto Rico at any point in the year. The closer connection test is met when you had no closer connection to the United States or a foreign country than to Puerto Rico. Both tests cover the whole year. A reconstructed day count that reaches 183 does not settle either one, so your rebuilt record should also show where you worked and where your ties were.

Does the law say estimates are acceptable?

Published guidance does not address this directly. The regulation sets one express recordkeeping rule, and it applies only to qualifying medical treatment days. For those days you must prepare or obtain, keep, and produce documentation within 30 days of a request. Section 1.937-1 has no general day-log requirement and no separate burden-of-proof provision.

Silence is not approval. No log rule does not mean an estimate will be accepted, and it does not mean one will be rejected. Neither Publication 570 nor the regulation says how an examiner treats a day count built after the fact.

You may see the Cohan rule mentioned in tax discussions. It comes from deduction cases, where a court may estimate an amount once the taxpayer proves the expense was incurred. We found no primary source applying it to residency day counts. Treat that as unsettled and do not plan around it.

If your year turns on this question, get it in writing from a licensed tax professional before you file.

Which records can rebuild your days?

The strongest records are the ones you did not create. A third party made them at the time, with a date attached, and you can ask for a copy.

Airline and other travel records. A booking confirmation, a boarding pass or an account history shows where you were on the day you flew. See airline records as proof of presence.
Card and bank transactions. A purchase at a San Juan grocery store on a Tuesday places you there that Tuesday. Statements are usually available for years.
Phone records. Carrier statements and location history can place you on a date. See cell phone records as proof of residency.
Lease and utility records. These show that a home was lived in over a period. See utility bills and leases.
Employer, medical, school and club records. Payroll location, appointment dates, enrollment and membership activity all carry dates.
Your own calendar and email. These are your records, but they carry timestamps you did not choose later, which gives them some weight.

Each record proves something narrow. A card swipe proves you or your card were somewhere at a moment. It does not prove you stayed the full day, and it says nothing about your tax home or your ties. Use records to anchor days, not to argue intent.

How do you assemble them?

Build one sheet with a row for every day of the year. For each day, write where you were and the record that supports it. Where one record covers a stretch, such as a lease covering a month of residence with card activity inside it, say so and note which days in the stretch have their own anchor.

Mark every day you cannot support as unsupported. Do not fill the gap with a best guess and then treat the guess as a fact.

What cannot be rebuilt?

Some things stay out of reach. Better to know which before you file.

Days with no independent anchor. A week at home with no purchases, no travel and no calls leaves nothing to point to.
Days that rest on memory alone. Your recollection is evidence, but it is the weakest kind, and it gets weaker as the year recedes.
Timing of a tax home change. If the date you stopped working somewhere else matters, only employment and payroll records can show it.
The shape of your ties. Where your family lived, where you banked and where you registered to vote are facts about the year, and records created later do not change them.

If the count depends on days in these groups, say so plainly in your own notes. The year may still be strong enough. You will not know unless you separate supported days from unsupported ones.

What do you do if you kept no day log at all?

Start with the sheet described above, and keep each source document with it. Then compare the supported total with the threshold you rely on. Our guide to documenting presence for an audit covers what to keep and for how long.

Three results are possible. The supported days clear the threshold with room to spare, they sit close to it, or they fall short. Only the first is comfortable. In the second and third cases the year is weak, and an advisor needs to see it before you file, not after an examiner asks.

Bring the sheet, the source records, and a list of the days you cannot support. A professional can tell you how that year looks against your whole fact pattern, which this page cannot do.

How do you stop this from happening next year?

Keep a record as you go. A note made on the day is easier to defend than one rebuilt months later, and it costs far less to produce. A contemporaneous day log is the usual answer. One83 is an iOS app, coming soon, that builds a day ledger from your calendar so the record exists before anyone asks for it.

Frequently Asked Questions

Can you reconstruct your Puerto Rico day count after the year ends?

You can rebuild a day count from third party records such as airline, card, phone and lease records, but each day needs an anchor you can point to. Days with no anchor are weak, and the published guidance does not say how much reconstruction is enough.