Terms of use
Applies to Per Diem Tool (perdiemtool.com). Last updated 2026-08-17.
Acceptance
By using this site you agree to these terms. If you do not agree, do not use the tools or pages.
What this service is
Per Diem Tool provides static web tools that look up and estimate CONUS per-diem related figures from published public data (including GSA and IRS sources). It is a BlackStack Systems utility site, not a government service.
Accuracy and no warranty
Rates and calculators are an unofficial reproduction of public GSA/IRS data for convenience. We are not affiliated with GSA, IRS, or any government agency. Figures may lag official updates, and trip math can be wrong for your facts. Confirm every number on official sources before you file a voucher or tax return. See also the disclaimer.
Limitation of liability
To the fullest extent permitted by law, BlackStack Systems is not liable for any loss arising from use of or reliance on this site, including incorrect rates, downtime, or third-party links.
Intellectual property and permitted use
Site design, copy, and tooling (excluding third-party data) are published for personal and ordinary business reference. Do not scrape at abusive volume, misrepresent affiliation with GSA or IRS, or republish the tools as an official government product.
Third-party links
Links to gsa.gov, irs.gov, and other sites are for convenience. Their terms and privacy policies apply when you leave this domain.
Advertising
This site may use Google AdSense and related third-party advertising cookies. Details, including how to opt out, are in the privacy policy.
Changes
We may update these terms by posting a new version on this page with a revised “Last updated” date. Continued use after a change means you accept the updated terms.