Sources

Dynamic Traveller is not affiliated with GSA, the Department of State or the Department of Defense. Every rate on this site is copied from the files below; nothing is estimated or adjusted.

1. GSA CONUS per diem rates

U.S. General Services Administration, Per diem rates and Per diem files. Downloaded 2026-11-02. Master rate files used:

• FY2027: FY2027_PerDiemRates_Validated090126.xlsx (295 non-standard areas) · SHA-1 87324aa51986
• FY2026: FY2026_PerDiemMasterRatesFile.xlsx (296 non-standard areas) · SHA-1 b23b083a75fe
• FY2025: FY2025_PerDiemMasterRatesFile.xlsx (296 non-standard areas) · SHA-1 2cd7517e9da3
• FY2024: FY2024_PerDiemMasterRatesFile_correction.xlsx (302 non-standard areas) · SHA-1 98d26e92d9e9
• FY2023: FY2023_PerDiemMasterRatesFile.xlsx (316 non-standard areas) · SHA-1 ad11462c6867
• FY2022: FY2022_PerDiemMasterRatesFile.xlsx (319 non-standard areas) · SHA-1 59be062e4984
• FY2021: FY2021_PerDiemMasterRatesFile.xlsx (319 non-standard areas) · SHA-1 cdc22f3a9a58
• FY2020: FY2020_PerDiemMasterRatesFile.xls (322 non-standard areas) · SHA-1 fe3742f89a2c
• FY2019: FY2019_PerDiemRatesMasterFile_0.xls (325 non-standard areas) · SHA-1 b8a13f1f2df4
• FY2018: FY2018_PerDiemRatesMasterFile.xls (332 non-standard areas) · SHA-1 cb32cc6e7eeb
• FY2017: FY2017-PerDiemRatesMasterFile.xls (346 non-standard areas) · SHA-1 b1b5866f894e
• FY2016: FY2016_PerDiemRatesMasterFile_1.xls (349 non-standard areas) · SHA-1 193f2417660b
• FY2015: FY2015_PerDiemRatesMasterFile.xlsx (362 non-standard areas) · SHA-1 319d05450e77

ZIP code files (ZIP to destination, with monthly lodging):

• FY2027: FY2027PerDiemZipCode_Validated090126.xlsx, 40,426 ZIP codes · SHA-1 216affc4da5c
• FY2026: FY2026_ZipCodeFile.xlsx, 40,426 ZIP codes · SHA-1 7ec6bbf6f86a

GSA M&IE breakdown: "FY2025_MIE_Breakdown.docx" (FY 25–present) and the M&IE breakdowns page (page last updated Jul 31, 2026).

Licence: GSA's website policies say: "Works produced by federal government employees in the course of their employment are generally not protected by copyright and are in the public domain in the U.S." GSA asks for citation and a link back, which this site gives on every page.

2. Department of State foreign per diem

U.S. Department of State, Office of Allowances, Foreign Per Diem Rates in U.S. Dollars (DSSR 925), publication date 11/01/2026. 1083 rows for 228 countries, read one country at a time from the public lookup. Public domain as a work of the U.S. Government (17 U.S.C. §105).

3. Defense Travel Management Office OCONUS rates

Defense Travel Management Office, Per Diem Rate Lookup, "Maximum per diem rates outside the continental United States", effective 2026-11-01 (PDF SHA-1 39db89937dd2). Used for Alaska, Hawaii and U.S. territories, and as an independent cross-check of the foreign rates: 1079 of 1081 matching foreign rows agree on lodging and M&IE. Public domain (17 U.S.C. §105).

4. Federal Travel Regulation

41 CFR Part 301-11, read from the eCFR (version of October 1, 2026, as amended by FTR Case 2025-05, 90 FR 56893). Used for the 75% first and last day rule (§301-11.20) and the other rules quoted on How per diem works. GSA per diem FAQs for boundary rules.

5. City search (calculator only)

City names and counties in the calculator's search box come from GeoNames (cities5000, CC BY 4.0) and U.S. Census county names. A city is matched to a GSA destination through its county; GSA's rule that a key city's corporate limits are included can make a city near a county line differ, so the calculator says which county it used. ZIP codes are matched directly with GSA's ZIP code file.

How the site checks itself

See methodology and checks.