Japan Health Insurance Surcharge Calculator 2026
子ども・子育て支援金 計算ツール
💸 How much MORE will you pay?
The "singles tax" started April 2026. Calculate your exact monthly cost.
🚨 Started April 2026: New mandatory health insurance surcharge for ALL foreigners.
Whether you have kids or not, you pay. Funds child allowance, free birth, and daycare programs. Already deducted from your April 2026 paystub. Read full guide →
Your Details
Company insurance — your employer pays the same amount as you.
Your Surcharge Cost
FY2026 (NOW)
¥479/month
¥5,748/year
FY2028 (Full Implementation)
¥833/month
¥9,996/year
ℹ️ Estimates based on Children & Families Agency rates. Your employer pays the same amount (if 社保). Actual rate varies by income bracket and city for 国保.
The "Singles Tax" Reality
You pay ¥5,748 per year in surcharge and get nothing back (no kids = no allowance). This is why Japanese social media calls it the "独身税 (dokushin-zei / singles tax)."
💡 Offset tip: Use Furusato Nozei + NISA to recover this small annual cost via tax benefits.
💡 Yamada Hack: 5 Ways to Offset the Surcharge
- • Furusato Nozei (ふるさと納税) — get rice/meat/electronics, reduces resident tax. Use our calculator
- • Max NISA (¥3.6M/year tax-free) — tax-free growth offsets the small monthly fee 100x over 20 years
- • iDeCo for retirement — tax deduction now, tax-free growth, low tax on withdrawal
- • Medical expense deduction — any year you spend ¥100,000+ on medical, deduct it
- • Register dependents properly — spouse with income under ¥1.3M can be your dependent (no surcharge for them)
❓ FAQ - Japan Health Insurance Surcharge 2026
❓ When did this start?
✅ April 1, 2026. Already on your April 2026 paycheck. Look for '子ども・子育て支援金' or compare your March vs April health insurance line.
❓ Is this a tax?
✅ Technically no — it's a 'contribution' added to health insurance. But on social media, Japanese workers call it 独身税 (singles tax) because childless people pay with no benefit.
❓ Do foreigners have to pay?
✅ Yes. ALL health insurance subscribers in Japan pay. No exceptions for foreigners, even if you plan to leave Japan soon.
❓ Can I opt out?
✅ No. Like all health insurance fees, it's automatic and mandatory.
❓ How much does it grow by 2028?
✅ FY2026 rate is the starting amount. By FY2028, the rate roughly doubles. Use the toggle above to see your FY2028 projection.
❓ I'm on Kokuho (National Health Insurance). Same?
✅ Yes, you pay the surcharge. Rate is per-person and varies by city. Tokyo and big cities charge more. You pay 100% yourself (no employer share).
❓ Will it affect my pension refund (脱退一時金)?
✅ No. Pension is completely separate. Pension refund when leaving Japan is unaffected.
❓ If I have children, do I get my money back?
✅ You receive the child allowance (児童手当): ¥10,000/month per child, ¥30,000/month from 3rd child. For most families with 1+ kids, you receive MORE than you pay in surcharge.
❓ What are the funded benefits?
✅ Bigger child allowance, free standard childbirth, free hourly daycare (¥300/hour), better post-birth leave benefit, pension exemption during childcare.
❓ Is this controversial?
✅ Yes. The Japan Research Institute identified 8 structural problems with using insurance premiums to fund childcare. Most countries fund this through general tax instead.
Japan Child & Childcare Support Levy (子ども・子育て支援金) — 2026 Guide
Starting April 2026, Japan added a new mandatory surcharge to every health insurance premium called the Child and Child-rearing Support Contribution (子ども・子育て支援金, kodomo kosodate shienkin). This calculator estimates your exact monthly and annual cost based on your salary and insurance type.
The surcharge applies to all health insurance subscribers in Japan — company employees (社会保険 / 健保組合), self-employed and students (国民健康保険 / Kokuho), and elderly residents. Foreigners pay just like Japanese citizens. There are no exceptions based on nationality, marital status, or whether you have children.
How it's calculated: For company employees (社保), the surcharge is approximately 0.115% of your standard monthly compensation in FY2026, scaling to roughly 0.20% by FY2028. Your employer pays the same amount (employer share). For Kokuho subscribers, the rate is approximately 0.09%-0.16% of income (varies by city, you pay 100%).
What the money funds: Six specific programs by law — (1) expanded child allowance (¥10,000/month per child, ¥30,000/month from 3rd child), (2) free standard childbirth from FY2026, (3) free hourly daycare for all parents (¥300/hour), (4) improved post-birth parental leave benefit (100% take-home pay), (5) childcare short-time work benefit, and (6) national pension exemption during childcare for self-employed parents.
Why is it called the "singles tax" (独身税)? Single people, childless couples, and gay couples pay the surcharge but receive no direct benefit. Only families with children get the offsetting allowances. This has caused significant social media backlash in Japan. The official position is "social solidarity for the next generation," but academic researchers like the Japan Research Institute have identified 8 structural problems with this funding approach.
How to offset the surcharge if you have no children: Use Furusato Nozei to reduce your resident tax, max out your NISA contribution (¥3.6M/year tax-free growth), contribute to iDeCo for retirement tax deduction, and track medical expenses for the year-end deduction.
For the complete deep-dive on this surcharge and the political debate around it,read our full 'Japan Singles Tax 2026' guide. You can also check your paystub line-by-line with our Paycheck Decoder.