Allowances API
REST API

Government allowance rates, without the spreadsheets

Plug GSA, DTMO, and DSSR per diem and overseas allowance data into ERP, travel, payroll, and proposal workflows through one normalized API.

✓ Current + historical rates
✓ Query by location + effective date
✓ Official public-source coverage
✓ Rate-limit friendly
Start free with sandbox View docs
Data sourced from official public per diem and allowances tables. Not affiliated with any government agency.

Quick examples

Request (GSA / CONUS)
curl -H "X-API-Key: YOUR_KEY" \
  "https://api.allowancesapi.com/v1/gsa/perdiem/state/NY?city=Albany"
Response
{
    "effective_date": "2025-10-01",
    "results": [
    {
      "state": "New York",
      "iso_code": "US-NY",
      "destination_id": 258,
      "destination": "Albany",
      "county": "Albany",
      "season_begin": "10/01",
      "season_end": "09/30",
      "lodging": 117,
      "meals_incidental": 86,
      "effective_date": "2025-10-01"
    }
    ]
}
Switch tabs to see examples for GSA (CONUS), DTMO (DoD OCONUS), and DSSR (State Dept).
Coverage
200+
Countries & territories
Locations
10k+
Cities / posts
Update cadence
Daily
Always up-to-date

Who It’s For

Integrate GSA, DTMO, and DSSR per diem data directly into your finance, HR, and travel systems — no spreadsheets, PDFs, or manual tracking.

Federal Contractors

Automate compliant travel cost modeling for proposals and overseas bids.

Pull current and historical GSA, DTMO, and DSSR rates directly into pricing models.

Government Finance Teams

Keep ERP, payroll, and travel systems aligned with official per diem tables.

Automatically update systems when GSA or overseas rates change.

Defense & Overseas Programs

Access DoD OCONUS and State Department allowances via structured API.

Replace manual DTMO PDFs and DSSR tables with normalized JSON endpoints.

Mobility & HR Teams

Calculate relocation, hardship, and cost-of-living allowances with confidence.

Support overseas assignments with effective-date-aware rate lookups.
See the API reference

Replace manual rate lookups with a single API

GSA DTMO DSSR

Stop maintaining spreadsheets and parsing publications. Pull current and historical rates with effective-date-aware queries and normalized JSON output.

Without Allowances API
Manual spreadsheet updates
  • ✕ Manual spreadsheet updates
  • ✕ Multiple official sites to monitor
  • ✕ Hard-to-audit rate changes
  • ✕ Engineering time spent on ingestion/cleanup
With Allowances API
Automated, consistent, auditable
  • ✓ One normalized API
  • ✓ Consistent current + historical lookups
  • ✓ Faster payroll, travel, ERP, and proposal workflows
  • ✓ More auditable, lower-maintenance process
Tip: include the date parameter to retrieve rates as-of any effective period.

Pricing

Straightforward subscription pricing with procurement-friendly options.

Sandbox

Perfect for developers to build and test their integration with live data before going to production.

$ 0 /month
  • Current rates only (no historical data)
  • Unified Global Data (GSA, State, and DoD)
  • 100 requests per day (Rate-limited)
  • Full access to API documentation and code samples
Start Testing
Most Popular

Pro

Automate your travel compliance and eliminate manual spreadsheet errors for your growing team.

$ 79 /month
  • 50,000 requests per month
  • Full Current-Year Rates with Automated Updates
  • Unlimited Team Seats (no per-user fees)
  • Standard Email support (48-hour SLA)
Get Started

Business

For platforms needing high-volume data and deep historical audit records.

$ 199 /month
  • 500,000 requests per month
  • Full historical data (Access back to the 1990s)
  • Priority Email Support (24-hour SLA)
  • Bulk Export (CSV/JSON) capability
Go Business

Enterprise

Mission-critical reliability with custom SLAs and security compliance tailored for large organizations.

Contact Us
  • Multi-million request limits
  • Guaranteed Uptime SLA (99.9% availability)
  • Security & Audit Support (DCAA compliance ready)
  • Custom invoicing and payment terms
  • Dedicated Account Manager
Contact Sales

FAQ

Answers for procurement, finance, and implementation teams.

Do you support annual invoicing, POs, or vendor onboarding?

Yes. Annual invoicing and PO-based procurement are available on request. We can provide standard vendor onboarding documentation (e.g., W-9 and vendor forms) as needed.

Is an SLA available?

SLA options can be included for annual plans depending on expected volume and support requirements. Contact us for a quote.

Where does the data come from?

The API is built from official public allowances tables and presented as normalized, queryable REST endpoints. We are not affiliated with any government agency.

How often is the data updated?

We monitor published updates daily and refresh the dataset when rates change, including interim updates. If your workflow requires update notifications, contact us about alerting options.

What authentication do you use?

API access is controlled via API keys. Requests include an Authorization header and are subject to plan limits and rate limiting.

Can you provide a custom plan or higher limits?

Yes. We can support higher monthly volumes, custom rate limits, and annual billing. Email contact@allowancesapi.com with your expected usage.