In 2026, Europe is more "cashless" than ever, but carrying a small amount of physical currency remains essential. A general rule for travelers is to carry between €50 and €100 in cash per person at any given time. While major cities like London, Paris, and Berlin allow you to pay for almost everything—from metro tickets to street food—with a contactless card or mobile wallet, cash is still the "gold standard" for small mountain villages, local laundromats, and specific "cash-only" cafes in countries like Germany or Austria. Additionally, having small denominations (coins and €5/€10 notes) is vital for tipping tour guides, paying for public restrooms (which often cost €0.50 to €1.00), or handling small "service fees" in remote areas. For safety, it is recommended to keep your primary funds on a zero-forex markup travel card and treat your physical cash as an emergency backup for situations where digital payment terminals may fail or local connectivity is poor.