In 2026, it is generally unnecessary and often disadvantageous to bring a large amount of US cash to Canada. While many tourist-facing businesses in border cities (like Niagara Falls or Windsor) will accept US Dollars (USD), they almost always apply an "arbitrary" exchange rate that is 10% to 20% worse than the official bank rate. Furthermore, you will receive your change back in Canadian Dollars (CAD), often at a further loss in the conversion. Canada has become an almost entirely "cashless" society; from coffee shops to transit systems, the vast majority of merchants prefer contactless payments (Tap-to-Pay) via credit cards or mobile wallets like Apple Pay. For the best financial value, you should use a credit card with no foreign transaction fees, which will give you the most accurate daily exchange rate. If you feel more comfortable with some physical money, it is better to withdraw a small amount of CAD from a local ATM upon arrival. Remember that if you are carrying more than $10,000 CAD (or the equivalent in USD) in cash across the border, you are legally required to declare it to the Canada Border Services Agency (CBSA) to avoid seizure and fines.