While Japan has historically been a "cash-heavy" society, by 2026, it has become significantly more digitized. You no longer need "a lot" of cash for major expenses; credit cards, Apple Pay, and Google Pay are now standard in hotels, department stores, and even many chain restaurants. However, you still need a moderate amount of cash for three specific things: recharging physical IC cards (like Suica or Pasmo) at stations, paying at small traditional shrines and temples, and dining at "hole-in-the-wall" ramen shops or rural guesthouses. A good rule for 2026 is to carry about ¥10,000–¥15,000 (approx. £50–£80) per person as a daily "walking around" buffer. You can easily withdraw more Yen at 7-Eleven "7-Bank" ATMs, which are found on almost every corner and offer excellent exchange rates for international cards. For the best experience, load a digital Suica card onto your iPhone or Android wallet before you arrive, as this allows you to pay at most convenience stores and vending machines without ever touching a coin.