Money, Tax & Insurance: Eight Guides, From First Payslip to Sending Money Home
This is the front door for money, tax and insurance. What ties this topic together is that money does not happen once — it settles on an annual cycle. Wages come monthly, but residence tax is billed on the previous year's income, pension is deducted monthly, medical costs are paid per visit, and the tax return happens once a year. So the real risk is not forgetting a single step; it is discovering in year two the hole you dug in year one. This page puts the eight guides in situation order and lists the three mistakes people make most.
📅 Verified October 2026In one line: how money is taken from you in Japan, and how you get some of it back. It covers four things — take-home (what survives social insurance and tax), filing (when you must file a return yourself), cover (if your employer does not enrol you, you handle health insurance and pension yourself — and you can claim part of the pension back when you leave), and costs (the mechanisms that cap very large bills such as medical treatment). Figures change every year and differ by municipality and by employer size, so official guidance decides. This page just routes you to the right guide.
📍 Find your situation (ordered by where you are, not by importance)
① Just arrived: get a bank account and a phone number first
Without a bank account you cannot be paid; without a phone number you cannot complete a lot of paperwork. This guide covers the real barriers foreigners hit when opening an account (your length of stay affects whether you can), and the trade-offs between the big three carriers and budget SIMs.
② On a payroll: work out what your take-home actually is
Gross salary is not take-home. Social insurance, income tax and residence tax each have their own calculation — and residence tax is billed on the previous year's income, which is why many people find year two pays less than year one. That is not a payroll error. This guide breaks down all three deductions.
③ Time to file: the documents and process for a tax return
Side income, self-employment, changing jobs mid-year, large medical costs or donations — these situations usually mean filing yourself. This guide covers when filing is required, what to prepare, and what changed for 2026.
④ Not enrolled by your employer: health insurance, pension, lump-sum withdrawal
If your employer does not enrol you in employee health insurance and pension (students, people between jobs, freelancers), you enrol in the National Health Insurance and National Pension yourself. The switch after leaving a job has a deadline, and when you leave Japan you can claim part of your pension back as a lump-sum withdrawal.
⑤ Unwell: how to see a doctor and how the money works
Finding a clinic that accepts foreign patients, what a referral letter is, how to fill in the questionnaire, and why hospitals do not dispense medicine. One genuinely useful mechanic: if a treatment will be expensive, applying for the ceiling-amount certificate up front lets you pay only the cap at the counter.
⑥ A large bill: getting the overpayment back
Once the treatment is over, there are two more places to recover money. On the insurance side: the high-cost refund (settled per calendar month, with the excess over your ceiling returned) and the ceiling certificate (apply in advance, pay only the cap at the counter). On the tax side: the medical expense deduction (settled yearly, taken off your income). Both can be used together, and neither is automatic.
⑦ Having a child: the paperwork chain from pregnancy to nursery
Pregnancy notification and the mother-and-child handbook, the childbirth lump sum (use the direct-payment route so you only settle the difference at discharge), the birth registration within 14 days, the child allowance — which is not back-paid — and the nursery application. If you are not Japanese, the child's own residence status is a separate clock and a separate counter.
⑧ Sending money home: the cost is in the rate, not the fee
Compare what the recipient actually receives, not the fee. A single transfer over ¥1,000,000 is reported to the tax office by the institution — no form for you, but a record that exists. Splitting a transfer to stay under the threshold is the worst move available.
🧰 Tools you can use directly on this topic
💴 Take-home pay calculator
Enter a salary to see social insurance, income tax and residence tax, plus the year-one versus year-two difference
⚠️ The three mistakes people make most on this topic
Mistake 1: "Take-home is gross times a fixed percentage"
It is not a fixed percentage. Social insurance uses banded standard monthly remuneration with a ceiling, so at higher incomes the deduction rate actually falls; and residence tax is calculated from the previous year's income, unrelated to this month's pay. The result: year one often feels generous, and residence tax lands in year two — mistake it for a pay cut and your budget goes wrong. See the take-home calculator.
Mistake 2: "My employer handles all the tax and insurance"
While you are employed and enrolled, most of it is indeed handled for you. But two situations land on your desk: not being enrolled (students, short-hours workers, some non-regular employment), where you must join NHI and the National Pension yourself; and leaving a job, which requires switching to NHI and the National Pension — usually within a deadline, and missing it can affect the benefits you receive. See NHI, pension and lump-sum withdrawal.
Mistake 3: "Insurance covers 70%, so the rest is on me"
The 30% co-payment is only the first layer. For very large single bills or monthly totals, Japan has a high-cost medical expense benefit that caps your share — and if you apply for the ceiling-amount certificate in advance, you pay only the cap at the counter instead of fronting the full amount and waiting for a refund. Both require an application; neither applies automatically, and the caps are banded by income — official guidance decides. See getting medical costs back.
🗂️ Other topics
- Status & visas — which status, renewal, PR, starting a company, work permits
- Housing — renting, setting up utilities, moving, rubbish rules
- City hall & driving — the city office checklist and converting a foreign licence