Why a little tray runs cash transactions
The money tray—called karuton (カルトン, from the French carton) or simply a change tray—sits on most Japanese cash registers for two main reasons: avoiding hand-to-hand contact and keeping coins under control. It keeps a little distance between clerk and customer, and with six denominations of coins in circulation, laying everything out on one surface keeps coins from scattering and lets the clerk check the amount at a glance.
The system predates the pandemic by decades—trays like this spread to banks and shops in the early Showa era. COVID just gave it a fresh boost.
Where there’s a tray, cash goes in the tray. Where the clerk points to a machine, cash goes in the machine. That’s the whole rule.
A few “nice to know” extras
- Paying by card — Credit cards are usually handed to the clerk, or inserted or tapped at a terminal on the counter. Some terminals can switch to English.
- IC cards and QR payments bypass everything — Tap your Suica or scan PayPay and the tray simply sits there empty.
- Coin counting takes a beat — If you dump a fistful of 1-yen and 5-yen coins into the tray, the clerk will count them carefully. Don’t hover. Let the count finish, then the transaction moves on.
- The tray doubles as an object handoff — Receipts, coupons and other small items sometimes come back in the tray alongside your change. Scoop it all up together.
Quick check
Three questions to lock in the tray reflex. Takes about 20 seconds.