2025 Per Diem Rates Hawaii. Per diem increases with # of dependents. On july 1, 2025, the resident population for the state of hawaii was 1,446,146.

2404, which increases the standard deduction every two years through 2031 and raises the income tax limits that apply to the income tax. The federal per diem rates for isle of oahu, hawaii are $202.00 per night for lodging and $157.00 for m&ie as of december 2025.