Most countries require travellers to complete a customs declaration form when bringing notified goods (alcoholic drinks, tobacco products, animals, fresh food, plant material, seeds, soils, meats, and animal products) across international borders.

When passing through customs in 2026, you must declare any items that are dutiable, restricted, or prohibited, as well as any currency over a specific threshold. This includes "commercial" quantities of goods intended for resale, high-value jewelry, and any items that exceed your "duty-free allowance" (typically $800 for U.S. residents returning from abroad). Most importantly, you must declare all food, plants, and animal products. Even a simple apple from a flight or a bag of beef jerky can result in a fine if not disclosed, as these pose a risk of bringing in invasive pests or diseases like Foot-and-Mouth. You also need to declare currency or monetary instruments (cash, checks, or money orders) if the total value exceeds $10,000 USD (or the equivalent in foreign currency). While carrying large sums isn't illegal, failing to report it is a serious federal offense that can lead to seizure. In 2026, many countries have moved to digital declarations via apps like "CBP MPC" (Mobile Passport Control), making the process faster. When in doubt, always declare the item to the officer; it is better to have an item confiscated than to face a $500 fine and the loss of your Trusted Traveler (Global Entry) status.