Yes, you must always declare cigars at customs when entering a new country, even if you believe you are within the "duty-free" allowance. In 2026, customs forms (physical or digital via apps like MPC) require you to state if you are carrying tobacco products. For entry into the United States, the duty-free limit is typically 100 cigars (excluding Cuban cigars, which are currently subject to fluctuating restrictions). If you exceed the limit and declare them, you will simply pay a tax on the excess. However, if you fail to declare them and are caught during a bag search, you face significant fines, the permanent seizure of the cigars, and the potential loss of "Trusted Traveler" status like Global Entry. In the UK and EU, the limits are often lower (e.g., 50 cigars), and the penalties for non-declaration are strictly enforced to combat smuggling. Always remember: declaring them is free and keeps you legal; hiding them is a high-stakes gamble.