Idaho per diem rates (FY2026)
Idaho has 3 cities with their own GSA rate. Everywhere else in the state uses the standard rate.
| City / county | Lodging | M&IE |
|---|---|---|
| Boise · Ada | $167.00–$191.00 | $86.00 |
| Coeur d'Alene · Kootenai | $142.00–$217.00 | $74.00 |
| Sun Valley / Ketchum · Blaine / Elmore | $181.00–$300.00 | $80.00 |
About Idaho per diem
GSA has surveyed and listed a non-standard rate for 3 locations in Idaho, topping out at $300.00 a night in Sun Valley / Ketchum. Every other city or county in the state defaults to the standard CONUS rate of $110.00 lodging and $68.00 M&IE.
On the first and last day of any trip, M&IE is paid at 75% under the first/last-day rule — $51.00 at the standard rate, or the equivalent 75% figure for whichever listed city you're travelling to. See how to calculate per diem for a business trip for the full worked example.
Frequently asked questions
Does every city in Idaho have its own per diem rate?
No — only 3 locations have a separately listed GSA rate in Idaho. Every other city or county in the state uses the standard CONUS rate of $110.00 lodging + $68.00 M&IE.
Which city in Idaho has the highest per diem rate?
Sun Valley / Ketchum has the highest listed lodging cap in Idaho, at $300.00 a night, compared with $191.00 in Boise.
How do I calculate per diem for a multi-city trip through Idaho?
Use the calculator on each city's page for the nights spent there, then add the totals together — lodging caps and M&IE tiers can differ from one Idaho city to the next, so a single flat rate for the whole trip would be inaccurate.
Calculate a trip → PerDiemWise is an independent tool, not affiliated with the GSA.