What are the government travel regulations for contractors?

Government travel regulations for contractors are primarily governed by Federal Acquisition Regulation FAR Part 31, which defines allowable travel costs, and specific contract clauses, not Joint Travel Regulations JTR directly, though JTR rates are often referenced as cost ceiling. Contractors working for federal government are not subject to JTR or Federal Travel Regulation FTR as personnel, they are private employees governed by company travel policy and FAR. Under FAR 31.205-46, travel costs are allowable if reasonable and comply with contract terms. Many government contracts, especially DoD service contracts, include clause that contractor travel will be reimbursed in accordance with FTR or JTR per diem rates, meaning contractor can only bill government up to GSA per diem for lodging, meals, and incidental expenses, and must use economy airfare, compact rental car, and provide receipts for lodging and expenses over 75 dollars. Contractor must keep documentation and travel must be necessary for contract performance. Contractor cannot use Defense Travel System DTS or government contract airfares unless authorized. Government travel regulations for contractors also require that travel be approved in advance by contracting officer if contract requires. Personal travel combined with official must be at no extra cost. So government travel regulations for contractors mean contractor must follow company policy, FAR reasonableness, and contract-specific limits that often reference FTR and JTR rates as maximum reimbursable amounts, not that contractor must follow JTR as military personnel.