The Suica cannot be used for travel on the Shinkansen.

You cannot use a Suica card (or Pasmo/ICOCA) to simply "tap and go" through a Shinkansen gate the way you do for a local subway. The Shinkansen requires a specific "limited express" ticket that is separate from the basic fare stored on an IC card. However, in 2026, you can use your Suica if you link it to a digital service in advance. The most popular methods are Smart EX and Shinkansen e-Ticket. Through these apps, you purchase your Shinkansen ticket online using a credit card and then "assign" that ticket to your physical or Mobile Suica card. Once linked, you can indeed tap your phone or card at the Shinkansen gate. Additionally, JR East offers a "Touch de Go! Shinkansen" service for non-reserved seats on certain lines, but this also requires a one-time registration at a ticket machine. Without these digital links, trying to tap through will result in a gate error, requiring you to visit the ticket office to buy a traditional paper ticket.

Yes, you can use a Suica card (or other IC cards like Pasmo, Icoca, etc.) to pay for Shinkansen tickets, but there are some important details to keep in mind:

1. IC Cards Alone Are Not Enough:
   Suica and other IC cards cannot be used directly to board Shinkansen trains. You need to purchase a separate Shinkansen ticket.

2. Using Suica for Payment:
   You can use your Suica card to pay for Shinkansen tickets at ticket machines or ticket counters that accept IC card payments. This is convenient if you don’t want to carry cash or use a credit card.

3. Shinkansen Tickets:
   Shinkansen tickets include a base fare and a limited express fare. You can use Suica to pay for both, but you must still obtain a physical ticket or QR code to board the Shinkansen.

4. Suica-Compatible Shinkansen Services:
   If you’re traveling on certain Shinkansen lines (like the Hakutaka service on the Hokuriku Shinkansen), you can use a Suica + Shinkansen ticket combination for seamless boarding. This allows you to tap in and out using your Suica card, but you must still reserve a Shinkansen seat in advance.

5. JR East Shinkansen Lines:
   On some JR East Shinkansen lines (e.g., Tohoku Shinkansen, Yamagata Shinkansen), you can use Suica for certain reserved seat tickets if you purchase them through compatible ticket machines or apps.

Summary:

While Suica cannot be used directly to board Shinkansen trains, it can be used to pay for Shinkansen tickets. Always ensure you have a valid Shinkansen ticket or reservation before boarding. For seamless travel, check if your route supports IC card integration with Shinkansen services.