You check the GSA lookup: the lodging cap for your destination is $149. The only hotel near the work site is $219. Congratulations, you've found the most stressful line in federal travel: a room above the per diem rate is not automatically reimbursable, and "I'll just eat the difference" gets expensive fast. There is, however, an official escape hatch. It's called actual expense reimbursement, and here's how it works.
Check the cap before you book: look up FY2027 per diem rates by city.
First, the things that don't work
Two common workarounds are explicitly off the table:
- You can't mix and match lodging and M&IE. The FTR makes no provision for it. Lodging is reimbursed at actual cost up to its maximum; there is no "extra" lodging money to speak of, and M&IE can't be surrendered to fund a nicer room. If you spent $40 on meals against an $86 M&IE rate, that $46 difference doesn't buy you $46 more hotel.
- You can't assume the hotel's GOV rate equals the per diem cap. Hotels aren't required to honor the federal per diem rate, and a property's government rate may differ from the reimbursement limit. The number that matters is the GSA rate for your locality and month, not what's on the hotel's rate card.
Also note that lodging taxes are handled separately from the cap in the continental US. A $149 room with $18 in taxes is a $149 room for cap purposes, with taxes on their own line. Keep the invoice.
The actual expense provision
When the per diem rate genuinely won't cover necessary lodging, the Federal Travel Regulation (FTR 301-11.300 through 306) lets your agency authorize actual expense reimbursement of up to 300 percent of the applicable maximum per diem rate. On a $149 lodging cap, that's up to $447 a night. The key word is authorize: this is not a blanket entitlement. The approval is conditional, must follow your agency's procedures, and should be obtained before travel or before the expense is incurred.
GSA's own FAQ frames it plainly: if lodging isn't available at your temporary duty location, ask your agency to authorize the actual expense provision, and check FedRooms first to confirm there's genuinely nothing available at per diem in the area. Document the search. "Nothing was available" is a claim; a FedRooms search with dates is evidence.
USDA's travel FAQs add the ceiling nobody can waive: reimbursement of actual expenses is limited to the 300 percent ceiling, and there is no authority to exceed it. A $500 room against a $149 cap ($447 max) leaves $53 on you, no matter who approves what.
How to actually get the approval
- Check the right rate first. Confirm the locality, the county boundaries, and the month. FY2027 rates run October 1, 2026 through September 30, 2027, and seasonal destinations change by month. Albuquerque's cap jumped from $144 to $208 this year; San Francisco went $272 to $325; Nashville dropped $248 to $230. The standard CONUS lodging rate is now $113. Rates move every October, and last year's number is not this year's number.
- Search FedRooms and the local market. Screenshot or save the results showing nothing suitable at or under the cap near the duty location.
- Request authorization before you book, through your agency's travel manager or authorizing official, following agency procedure. After-the-fact approvals are harder and sometimes impossible.
- Keep every receipt. Lodging always requires receipts regardless of amount, and any authorized expense over $75 needs one too.
When the rate itself is the problem
If you travel somewhere repeatedly where the rate is structurally too low, there's a longer-term lever: requesting a per diem review under FTR 301-11.26. You submit lodging and meal cost data through your agency's travel manager, who can forward it to GSA for CONUS locations. GSA sets rates from backward-looking hotel market data, so a market that got expensive this year shows up in next year's rates. A review request with real data is how corrections start. It won't help this week's trip, but it helps next year's travelers.
A worked example
You're sent to a conference town where the lodging cap is $161 and the conference hotel is $235 a night for three nights. The gap is $74 a night, $222 total, and you can't transfer M&IE to cover it. Before booking, you check FedRooms: the only other options are 40 minutes from the site or sold out. You request actual expense authorization through your travel manager with the FedRooms results attached, get approval, and book the $235 room. At checkout you keep the itemized invoice; taxes go on their own line. The $222 gap is reimbursed instead of coming out of your pocket, because you did the paperwork before the stay, not after.
Frequently asked questions
Can my agency approve more than 300 percent of per diem?
No. The FTR caps actual expense reimbursement at 300 percent of the applicable maximum per diem rate, rounded to the next higher dollar. There is no authority to exceed that ceiling.
Do I need approval before I travel?
Yes, that's the requirement. The authorization should be obtained before travel or before the expense is incurred, following your agency's procedures. Retroactive approval is unreliable.
What if the hotel is over the cap but I found it myself cheaper than the conference hotel?
The rule is the same: anything over the cap needs actual expense authorization. That said, finding the cheapest suitable option strengthens your request and your conscience.
Does actual expense cover meals too?
It can. The provision covers the per diem rate generally, but in practice it's invoked for lodging. M&IE under actual expense still requires the agency's authorization and documentation.
Know the cap before you book
Look up FY2027 GSA per diem rates for your destination and build a trip estimate, then start the actual expense request with the numbers in hand.