Per-Diem reimbursement means that a flat rate is reimbursed to the traveler in lieu of actual expenses for lodging and meals; no receipts are necessary. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date.Traveling to New Hampshire for work? Our per diem calculator tells you exactly how much you can spend daily on your business trip. Registration Fees days). Per diem is an allowance for lodging, meals, and incidental expenses. The US General Services Administration (GSA) establishes the per diem reimbursement rates. Calculate your per diem allowance for your trip. Simply enter your travel dates and details to find out your per diem allowance. Public comment on agenda items will be allowed when they come up. 6.