Convert the bill using the applicable rule
FTR §§301-11.8–9 address allowable expenses and daily lodging computation when accommodation is rented for a period such as a week or month. The daily amount is based on the authorized rental costs and applicable days, rather than treating a monthly invoice as a one-night expense.
For example, a hypothetical authorized 30-day room rental costing $3,000 has a $100 daily base room component before any separately allowable charges. This arithmetic does not establish that every charge in a lease or hotel bill is reimbursable.
Reduced rates need an agency determination
FTR §301-11.22 allows an agency to set a reduced per diem when it can determine in advance that lodging or meal costs will be lower than the normal allowance. Do not assume that every federal civilian trip automatically drops to a fixed percentage on day 31. The applicable authorization and conditions matter.
Record whether the approval changes lodging, meals or both, along with its effective dates. Furnished meals, personal time and an early end to the rental can also require separate treatment under the controlling policy.
What the standard calculator can represent
This site accepts up to 90 nights, an optional default room cost and individual nightly prices. It can show a normal nightly ceiling estimate across months and fiscal years. It does not interpret a lease, average authorized monthly expenses, apply a reduced agency allowance or determine extended-assignment tax consequences.
Use it for the ordinary rate reference, then keep the rental agreement, actual bill and agency determination with the travel records. Do not present a normal ceiling estimate as an extended-stay authorization.
Official sources
This guide explains a general method. Your travel authorization and applicable policy determine the claim. Report a correction.