You can use a Suica card (including the Welcome Suica or Mobile Suica) to pay for the base fare of the Narita Express (N'EX), but it is not a "tap-and-go" service for the entire journey. The N'EX is an all-reserved, "Limited Express" train. This means you must have two things: a base fare ticket and a Limited Express reserved seat ticket. You can tap your Suica at the gate to cover the base fare (approx. ¥1,500 to Tokyo), but you must purchase the reserved seat supplement (approx. ¥1,700) separately at a ticket machine or online. If you only tap your Suica and board the train without a seat reservation, you will likely be caught by the conductor and asked to pay the supplement in cash, often at a higher "on-board" price. For most tourists in 2026, the N'EX Round Trip Ticket (¥5,000) is a much better value than using a Suica card, as it covers both the base fare and the reserved seat for a significantly discounted total price.