Per diem · ID · GSA FY2027 from October 1, 2026
Per diem rates in Idaho, FY2027
Idaho's 3 GSA areas sit on 3 different M&IE tiers in FY2027, and Sun Valley has not one high season but two.
GSA FY2027 ZIP file published · rates checked · Published by Radif Partners · Rules and data
Federal per diem for the trip
$832
Sun Valley / Ketchum, ID · Sun, Oct 25 to Wed, Oct 28
| Lodging, 3 nights at the GSA maximum | $552 |
| M&IE before meal deductions | $280 |
| M&IE paid | $280 |
| Total | $832 |
Rates of fiscal year 2027 (October 1, 2026 to September 30, 2027). How this is calculated.
Day by day
| Day | Lodging | M&IE rate | Share | Meals off | M&IE paid |
|---|---|---|---|---|---|
| Sun, Oct 25 FY2027 | $184 | $80 | 75% | – | $60 |
| Mon, Oct 26 FY2027 | $184 | $80 | 100% | – | $80 |
| Tue, Oct 27 FY2027 | $184 | $80 | 100% | – | $80 |
| Wed, Oct 28 FY2027 | – | $80 | 75% | – | $60 |
- GSA areas above the standard rate
- 3
- Highest lodging maximum
- $316
- Where
- Sun Valley / Ketchum
- Everywhere else
- $113 + $68
Idaho per diem for FY2027 reaches $316 of lodging a night in the Sun Valley / Ketchum area (Blaine and Elmore counties) in December, January, February and March, and a second peak of $293 from June to September; only April and May and the fall months drop near $183. Boise (Ada County) has the richest meals allowance in the state, $86, though its room cap tops out at $201. Coeur d'Alene (Kootenai County) peaks at $227 in June, July and August. Nampa, Idaho Falls, Pocatello and Twin Falls take the standard $113 and $68. The FY2027 rates run from October 1, 2026 to September 30, 2027. In Sun Valley three nights at the federal maximum total $1,228 from January 25, 2027, $1,159 from July 19 and $829 from May 3. The calculator opens on Sun Valley.
Blaine County has a winter peak and a summer one
Sun Valley / Ketchum has two expensive seasons, not one. Its FY2027 calendar reads $184 in October and November, $316 in December, January, February and March, $183 in April and May, then $293 in June, July, August and September. The summer step is only $23 under the winter top, so the cheap windows are short: two months in autumn, two in spring. Compared with FY2026 the winter cap went up $16. M&IE is $80 all year.
Sun Valley / Ketchum, ID: per diem for a stay
Lodging + M&IE at the federal maximum
$832
| Lodging: 3 × $184 | $552 |
| M&IE: 2 travel days at $60 | $120 |
| M&IE: 2 full days at $80 | $160 |
Lodging taxes on top; provided meals are deducted in the full calculator.
Mountain Home rides on the Sun Valley rate
GSA draws the area as "Blaine / Elmore", and Elmore County carries the same caps as Blaine. The Census file places Mountain Home in Elmore County, so lodging there follows the Sun Valley calendar too, up to $316 in winter, even though the town is listed under neither name. A traveler checking only the city list would assume the standard $113; the ZIP code search gives the right answer.
Boise: modest rooms, top meal tier
Ada County, which covers Boise and Meridian, is the only Idaho area on the $86 M&IE tier. Its lodging moves from $176 in November, December, January, February, March, April and May to $201 in October, June, July, August and September. Canyon County, home to Nampa and Caldwell, has no listing. Three July 2027 nights cost $904 at the federal maximum in Boise against $577 in Nampa, a difference of $327 that is partly meals: $18 a day more on full days. Coeur d'Alene and Post Falls (Kootenai County) sit on the $74 tier with a summer peak of $227, up from $217.
Fuel and power in Idaho
EIA counts Idaho in its Rocky Mountain region, where regular gasoline averaged $4.417 a gallon in the week of October 5, 2026, $0.063 above the U.S. figure. Electricity is cheap: 12.96 cents per kWh for households over January to July 2026, against 18.19 cents nationally. On a Boise to Ketchum drive the IRS rate of 76 cents is the same either way; the gas cost calculator shows what the fuel takes from it.
Fuel for a drive at Idaho (EIA Rocky Mountain) prices
Fuel cost
$47.32
| 10.7 gal × $4.417 | $47.32 |
| Per mile | $0.158 |
| Same miles at the IRS rate ($0.76) | $228 |
Every GSA area in Idaho: FY2027 against FY2026
| GSA area | Counties or limits | Lodging FY2027 | M&IE | Lodging FY2026 |
|---|---|---|---|---|
| Sun Valley / Ketchum | Blaine / Elmore | $183 to $316 | $80 | $181 to $300 |
| Coeur d'Alene | Kootenai | $148 to $227 | $74 | $142 to $217 |
| Boise | Ada | $176 to $201 | $86 | $167 to $191 |
| Rest of the state | All other counties | $113 | $68 | $110 |