Trains are the one bill a commuter in Japan pays almost every day, so a small per-ride difference compounds fast. Mio doesn't care whether tapping "feels" cheaper — here's the math.
A rechargeable IC card — Suica, PASMO, and their regional siblings — is the default. Two reasons: the IC fare is usually a few yen lower than the equivalent paper ticket on many operators, and tapping through the gate is faster than buying a ticket each time. Over 40+ rides a month, a few yen each adds up, and the time saved is free.
Mobile Suica / Mobile PASMO (in Apple Wallet or on Android) go one step further: no plastic card, no ticket machine, and you can top up from your phone. If you have a smartphone, there's little reason to carry a physical card except the refundable deposit sitting on it.
A teiki is a fixed-price pass for one specific route (station A ↔ station B) over 1, 3, or 6 months. Inside that route it's effectively unlimited: you can ride the same segment as many times as you want for no extra charge, including days off and side trips along the line. The decision is pure break-even — how many round trips do you make per month?
| Assumption (illustrative) | Value |
|---|---|
| One-way IC fare | ¥320 (illustrative, check your route) |
| Round-trip cost | ¥320 × 2 = ¥640 |
| Commuting days per month | 22 |
| Pay-as-you-go for the month | ¥640 × 22 = ¥14,080 |
| 1-month teiki (illustrative) | ¥11,500 (illustrative, check your route) |
| Verdict at 22 days | Teiki saves ≈ ¥2,580/month → teiki wins |
| Break-even point | ¥11,500 ÷ ¥640 ≈ ~18 round trips/month |
So in this illustrative case, once you make roughly 15–18 round trips a month on the same route, the teiki beats paying each time — and every extra trip inside the route after that is free. Work from home a lot or travel a varied set of routes? Pay-as-you-go with an IC card may win instead. Plug in your real fare and pass price before deciding.
Teiki come in 1-, 3-, and 6-month lengths, and the longer the term, the cheaper the per-month cost. If you're confident you'll keep the same commute, the 6-month teiki is usually the lowest monthly rate — you're prepaying, but you lock in the discount.
Students (通学定期, tsūgaku teiki) get a separate, cheaper commuter rate than the standard commuter one (通勤定期), but you typically need proof of enrollment from your school to buy it. If you're a student commuting to campus, this is a real, often-overlooked saving — check with your operator.
The ¥500 deposit. A physical Suica/PASMO usually costs a ¥500 deposit (illustrative) on top of your charge balance. It's refundable when you return the card, so it isn't a real cost — just money parked. Mobile Suica/PASMO generally skips the plastic deposit.
Autocharge. Some IC cards linked to a credit card top up automatically when the balance drops. Convenient, but it's still your money — it doesn't make rides cheaper, it just stops you queuing.
Always use an IC card over cash/paper tickets — it's a few yen cheaper per ride and faster, and mobile Suica/PASMO removes the ticket machine entirely. If you commute the same route ~15+ round trips a month, buy a teiki, and buy the 6-month version if you're staying. Students: get the tsūgaku rate. The right answer isn't about convenience — it's about how many times your meter runs on the same track.