GSA per diem · OF-1164 · federal & official travel

Per diem

Per diem you can prove.

A per-diem claim is usually just a number someone types in. Time Tracker backs every travel day with a real, timestamped record of where you actually were — then matches the official GSA rate and fills the form. Evidenced, not asserted. Computed on your device, with no AI and no server in the middle.

Try it on TestFlight See how a day gets built

The day, geostampedPresence

A day of GPS presence — the dominant location wins

Not a number you typed

A day you can actually prove.

While per-diem tracking is on, Time Tracker keeps a light GPS breadcrumb — roughly every ten minutes — so even a day with no trip and no meeting still has a record. At the end of the day it clusters where you dwelled, and the location you spent the most hours in wins. That becomes the day's per-diem locality: earned from real presence, not entered by hand.

Every day covered — even the ones with no trip or calendar event
The dominant location by dwell time wins, reverse-geocoded to city, county & ZIP
A timestamped trail behind each claim — audit-ready, hard to fake
The breadcrumb lives only on your device and auto-clears after 60 days

How it works

How a per-diem day gets built.

Four quiet steps, all on your phone. Nothing to file by hand, nothing sent to a server.

Step 1

It geostamps your day

A low-power breadcrumb records where you are through the day — in the background, screen locked, opt-in and easy to turn off.

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Step 2

The dominant location wins

At day's end it clusters your points, sums the hours, and the place you actually spent the day in becomes the locality — coffee stops and drive-throughs don't count.

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Step 3

It matches the official GSA rate

The locality is matched against the current GSA table at the finest resolution first — ZIP, then city, county, then Standard CONUS — for the correct season's lodging cap and M&IE.

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Step 4

It fills the declaration

Each day rolls up into a per-diem report and a filled GSA OF-1164 — with the first/last travel-day 75% rule applied — ready to hand your reviewer or accountant.

Locality & ratesGSA table

Monthly GSA lodging tiles, color-coded by season

The official rates, on your phone

Every locality, every season.

GSA publishes twelve monthly lodging values and a flat M&IE for each locality — but no dates. Time Tracker imports the real table, works out each season's start and end, and keeps it current on device, multiple years at once. Browse any city and see the whole year at a glance, color-coded by season.

The genuine GSA rate table — imported, seasonized, and self-updating
Lodging caps by month plus the flat M&IE, with the 75% travel-day rule built in
Any fiscal year, any locality — searchable, and stored entirely on your device

Resolved dayAuditable

A single resolved per-diem day with locality, rate and breakdown

Every day, resolved

The locality, the rate, and the math — shown.

Each day resolves to one clear entry: where you were, how many hours you spent there, the matched GSA locality and season, the lodging cap, and the M&IE with travel-day and provided-meal rules applied. Nothing is a black box — and you can override any day if you know better.

The full GSA declaration field set, computed per day
Lodging cap, M&IE, first/last-day 75%, provided-meal deductions — all visible
Manual overrides are respected and never overwritten

It fills the forms

It doesn't stop at the number.

The same tracked data that proves your day also fills the paperwork the day ends in — the actual federal forms, not a lookalike.

GSA · OF-1164Declaration

GSA Optional Form 1164

The per-diem declaration, filled.

Your resolved days flow straight into a real OF-1164 — the Claim for Reimbursement for Expenditures on Official Business — itemized day by day, totaled, and backed by the geostamped record behind each line. Hand it to a reviewer with the evidence already attached.

IRS · W-9On demand

And when a client needs one

A ready W-9, in seconds.

The same back-office fills a current IRS Form W-9 from your business profile — name, entity type, address, and TIN — so you can hand any client a complete, correct W-9 without hunting for last year's copy.

Why a reviewer trusts it

Provable, official, and private.

Provable

Backed by real presence

Every day carries a timestamped GPS trail. The claim is evidenced, not self-reported — the kind of record an auditor can actually check.

Official

The real GSA rates

Localities, seasons, lodging caps and M&IE come straight from the current GSA table — matched to the finest resolution, never guessed.

Private

All on your device

Your location history stays in your own iCloud — no server, no account, no AI. The breadcrumb is opt-in and clears itself after 60 days.