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Last updated: April 2026. Colombia’s banking system is modern, digital, and, once you have a Cédula de Extranjería, surprisingly easy to use. Day to day, Cartagena runs on a mix of cash, debit cards, and the near-universal instant-payment app Nequi. This guide covers ATMs and withdrawal strategy, digital payment apps, opening a Colombian account (what’s required, what actually works), international transfers, exchange-rate timing, and what you owe in tax once the 183-day clock ticks.