Japan's income "walls," calculated:
where earning more leaves you with less.

First: do these walls even apply to foreign residents?

Yes. This is the key reassurance. Japan's income tax, resident tax, and social-insurance rules attach to your residence and employment in Japan — not to your passport. If you live in Japan and work here, the same "walls" apply to you as to a Japanese part-timer.

• Being in your spouse's tax dependent status or insurance dependent (扶養) status depends on income, not nationality.
• A spouse-of-a-national / spouse-of-a-resident visa or dependent visa generally does not by itself cap your part-time earnings (work-permission conditions can still apply to some statuses — check your residence card / immigration). The money walls below are the tax/insurance ones, and they treat you like any other resident worker.

The walls at a glance (2026)

The ¥1.03M wall — mostly gone for 2026 (moved to ¥1.23M)

This was the famous one, and it's the one where old articles are now wrong. It was the income level where your own income tax started, built from the basic deduction plus the employment-income deduction.

要確認 / verify: The 2026 reform adds a temporary, income-tested top-up for lower earners that effectively pushes the tax-free line as high as ¥1.60M–¥1.78M for people with lower total income (the exact figure depends on your income band and is being phased in for 2026–2027). Because it's tiered and temporary, don't quote a single number — confirm your own tax-free line with NTA for the year you're filing.

Either way, the takeaway is the same: crossing the old ¥1.03M no longer suddenly taxes you. And even when it did, the "damage" was small — income tax starts at just 5%, so the first yen over the line cost pennies, not your paycheck.

The ¥1.06M wall — social insurance at big employers (being abolished Oct 2026)

This is a real one, but it's mid-reform. At larger employers, a part-timer had to join the company's health insurance + Employees' Pension once they met all of: monthly wage ≥ ¥88,000 (≈ ¥1.06M/year), 20+ hours/week, expected 2+ months employment, not a student, and the employer over a size threshold.

要確認 / verify: The employer-size requirement (currently 51+ insured employees) is set to shrink and phase out in stages (reported: 36+ from Oct 2027, dropping further over roughly a decade, eventually reaching small employers). Exact staging is legislated but rolls out over years — confirm what applies to your specific employer with MHLW / your company.

Practical effect: if you work 20+ hours/week at a covered employer, you'll likely join company insurance regardless of a ¥1.06M figure. That's not automatically bad — see "should you cross it?" below.

The ¥1.30M wall — the real cliff

This is the one that can actually reduce your take-home. It's about dependent (扶養) status in your spouse's health insurance and pension.

• While your annual income stays under ¥1.30M, you can be your working spouse's insurance dependent — covered by their health insurance and (if your spouse is a company employee) counted as a Category-3 insured for the National Pension, paying ¥0 in premiums yourself.
• Cross ¥1.30M and you generally lose that dependent status. Now you must enrol in and pay your own health insurance + pension.

That's the cliff: the premiums you now owe are not a small deduction — they're a fixed annual cost that can be well over ¥250,000, so a small step over ¥1.30M can leave your household with less net money until your gross pay catches up.

Worked example — the ¥1.30M dip (illustrative — verify your own numbers)

Let's make the cliff concrete. This is a model calculation to show the mechanics, not your exact result. Premiums vary by city, insurer and age.

Case A — earn ¥1,290,000 (stay a dependent)

Case B — earn ¥1,350,000 (cross the wall)

Now you must pay your own National Pension and National Health Insurance. Using confirmed FY2026 figures for pension, and an illustrative health-insurance premium:

The dip, side by side

The ¥1.50M / ¥1.60M point — spouse special deduction (a slope, not a cliff)

This one worries people but shouldn't. It's about your spouse's tax, and it phases out gradually.

So on the tax side, there is no single scary "¥1.50M cliff" — just a gentle reduction of one of your spouse's deductions.

"Should you even cross it?" — the contrarian caveat

I run the numbers without emotion, so here's the case where "stay under the wall" is the wrong answer.

Mio's rule: if you can only earn a little over ¥1.30M, staying under it (or jumping clear past the dead zone) is the calculated move. If you can push well past it — or join your employer's insurance with hours — crossing is often the better long-run deal, because you stop being invisible in the pension system. Know where the dip is, then decide.

Summary

• These walls apply by residence and employment in Japan, not nationality — foreign residents on spouse/dependent status are treated like any resident worker.
• ¥1.03M (income tax): reformed — the tax-free line rose to ¥1.23M (Dec 2025), with a temporary top-up pushing it as high as ~¥1.60M–¥1.78M for lower earners in 2026 (verify with NTA). Old ¥1.03M advice is outdated.
• ¥1.06M (social insurance, big employers): the ¥88,000/month wage trigger is being abolished from Oct 2026; the 20-hours/week rule stays; employer-size rule phases out over years (verify with MHLW / employer).
• ¥1.30M (dependent status): the real cliff — cross it and you pay your own pension + health insurance. Threshold unchanged, but from April 2026 it's judged on contract projection (verify with the insurer).
• ~¥1.50M→¥1.60M (spouse special deduction): a gradual phase-out of your spouse's deduction (zero around ¥2.01M) — a slope, not a cliff.
• Crossing a wall can be worth it: your own pension/health record, and above the dead zone the loss reverses. Mio doesn't say never cross — know exactly where the dip is.