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Audit defense

Contemporaneous evidence: what residency auditors actually accept

Auditors distinguish contemporaneous records, created at the time, from reconstructed ones created later. Here's what actually counts as contemporaneous.

8 min read

Residency auditors distinguish between contemporaneous records and reconstructed records. The first are created at or near the time of the events they describe; the second are pieced together later from credit-card statements, calendar entries, and memory. Both can be admissible, but only one carries weight.

What makes a record contemporaneous

  • Created at or near the time of the event.
  • Dated by a system you don't control after the fact (timestamped by your phone, email, banking app).
  • Consistent with other contemporaneous records (no gaps or revisions that suggest after-the-fact authorship).
  • Routine in nature, part of a habit, not a one-off creation.

Examples of contemporaneous records

  • Boarding passes saved to your wallet at the time of travel.
  • Hotel reservation confirmations and check-in/out emails.
  • Credit card transaction records (the date stamp is from the issuer, not you).
  • Cell phone billing records with location/cell-tower data.
  • EZ-Pass, FasTrak, or other electronic toll records.
  • Social media posts with timestamps and geotags.
  • A daily trip log entered as you traveled (e.g., Tax Days entries).
  • Calendar entries created in advance of the event.

Examples of reconstructed records

  • A spreadsheet you built last week summarizing the prior year.
  • Calendar entries created retroactively to backfill missing periods.
  • Affidavits from family or friends recalling where you were.
  • Approximations like 'I was probably in Florida that month.'
Warning:

Auditors can tell the difference. A spreadsheet with 365 perfectly-aligned entries created in March 2027 for tax year 2026 is suspicious. Inconsistencies between your reconstruction and contemporaneous records are catastrophic.

The burden of proof

In most state residency audits, the taxpayer bears the burden of proving residency status. The auditor doesn't have to disprove your claim, you have to prove it. With contemporaneous records, your proof is strong. With reconstructions, you're disputing inferences from someone else's data.

Best practices for contemporaneous evidence

  • Log every trip the day you take it. Don't wait.
  • Use a tool that timestamps entries you can't edit later (or that maintains an audit log of edits).
  • Save boarding passes, hotel confirmations, and rental receipts in a dated archive.
  • Don't reconstruct after the fact, if you missed entries, mark them as estimated rather than backdate them.

Tax Days produces contemporaneous records

Tax Days timestamps every trip you log with the date you logged it. Your daily log becomes a defensible contemporaneous record. The exported PDF includes log timestamps so an auditor can see the records weren't backfilled.

Tip:

Build the habit of logging trips on the day you take them. Future-you will thank past-you.

FAQ

Frequently asked questions

What counts as contemporaneous evidence in a residency audit?

A record is generally contemporaneous when it was created at or near the time of the event, is dated by a system you don't control after the fact (a phone, email, or banking timestamp), is consistent with your other records, and is routine in nature rather than a one-off creation. Examples include boarding passes saved at travel time, hotel confirmation emails, credit card records, cell phone billing with location data, toll records, and a daily trip log entered as you travel.

Do auditors accept reconstructed records?

Reconstructed records can be admissible, but they generally carry far less weight than contemporaneous ones. A spreadsheet built later to summarize a prior year, retroactive calendar entries, affidavits from family recalling where you were, and approximations are all reconstructions, and inconsistencies between a reconstruction and contemporaneous data can be catastrophic to your case.

Who has the burden of proof in a state residency audit?

In most state residency audits, the taxpayer generally bears the burden of proving residency status. The auditor doesn't have to disprove your claim; you have to prove it, which is why contemporaneous records matter so much more than after-the-fact explanations.

What should I do if I missed logging some travel days?

Best practice is generally to mark late entries as estimated rather than backdating them to look contemporaneous. Auditors can spot backfilled logs (for example, a full year of perfectly aligned entries created months later), and a record that pretends to be contemporaneous is worse than an honest gap.

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