GSA per diem lodging and meal rate changes by city with effective dates, IRS standard mileage rate changes, federal travel regulation and city-pair airfare contract changes, state and company travel policy changes at large employers, expense platform and corporate card fee changes, hotel and airline corporate program changes, TSA and DOT rules that affect business travelers and tax rules on reimbursements and remote work travel, with the city, agency or rate first and the effect for a traveler taking ten trips a year.