Williamtown rate history — COLA (Post Allowance) (%). Query any past effective date directly via the API.
| Effective date | COLA (Post Allowance) (%) |
|---|---|
| Jul 12, 2026 | 25% |
| Jun 28, 2026 | 25% |
| May 3, 2026 | 30% |
| Apr 5, 2026 | 25% |
| Mar 22, 2026 | 30% |
| Feb 8, 2026 | 25% |
| Jan 11, 2026 | 20% |
| May 4, 2025 | 15% |
| Dec 29, 2024 | 10% |
| Nov 17, 2024 | 15% |
| Oct 20, 2024 | 20% |
| Oct 6, 2024 | 15% |
| Sep 22, 2024 | 10% |
| Sep 8, 2024 | 15% |
| Aug 11, 2024 | 10% |
| Jul 28, 2024 | 15% |
| Jan 28, 2024 | 10% |
| Dec 31, 2023 | 15% |
| Nov 19, 2023 | 10% |
| Aug 27, 2023 | 5% |
| May 21, 2023 | 10% |
The same location's rates under other U.S. travel-rate systems:
The post (cost-of-living) allowance offsets higher overseas costs of goods and services for U.S. government civilian employees assigned to Williamtown. It is expressed as a percentage of spendable income and is used by mobility, HR and payroll teams to compute overseas compensation.
The exact request that returns this page's data. Change the
date parameter to query any historical effective
date, or pull it straight into your ERP, payroll, or expense system.
curl -H "X-API-Key: YOUR_KEY" \ "https://api.allowancesapi.com/v1/dssr/allowances/AU?type=cola"{
"effective_date": "2026-07-12",
"results": [
{
"cola": {
"effective_date": "2026-07-12",
"rate": 25
},
"iso_code": "AU",
"location": "Williamtown",
"postcode": "91191"
}
],
"verification_url": "https://aoprals.state.gov/content.asp?content_id=184\u0026menu_id=78"
}The current DSSR COLA (Post Allowance) rate for Williamtown, Australia is 25%, effective Jul 12, 2026.
In Jun 28, 2026 the COLA (Post Allowance) rate was 25%. The full history is shown in the table above and is queryable by effective date via the API.
Allowances API is not affiliated with, endorsed by, or sponsored by any U.S. Government agency. All rate data is sourced from official public rate tables and re-published in a normalized format.