For business or tax purposes in 2026, a travel expense generally includes any "ordinary and necessary" cost incurred while traveling away from your "tax home" for work. This encompasses transportation (flights, train tickets, rental cars, Uber/Lyft), lodging (hotels, Airbnbs), and meals (though these are often only 50% deductible in many jurisdictions). Other qualifying expenses include baggage fees, tolls, parking, laundry (for longer trips), and even tips for service staff. For digital nomads or freelancers, "travel expenses" can also include coworking space day-passes or temporary SIM cards/data roaming. Crucially, a travel expense must be for business; if you extend a work trip for a weekend of sightseeing, only the portion of the trip dedicated to business is typically deductible. For 2026 record-keeping, a "pro-tip" is to use an app like Expensify or Zoho Expense to photograph receipts immediately, as digital tax audits have become the norm, and "lost paper receipts" are no longer an acceptable excuse for missing documentation.