30 Years of Social Insurance Premiums — How Much Has Take-Home Pay Fallen for a ¥300K Monthly Salary?
In 1990, social insurance premiums on a ¥300,000 monthly salary were approximately ¥36,150. By 2025 they reached approximately ¥46,485 — an additional burden of over ¥120,000 per year in 35 years. Health insurance rose from 3.4% to 10%, employees' pension from 3% to 18.3%, and long-term care insurance from zero to 1.82%. This article visualizes the full history of this "invisible tax increase" using premium rate data.
TL;DR
- The total social insurance premium rate (employee share) rose from approximately 9.3% in 1990 to approximately 15–16% in 2025 (an increase of over 6 percentage points)
- For a ¥300,000 monthly salary, social insurance premiums increased by approximately ¥10,000 per month and over ¥120,000 per year compared to 1990
- In 2000, long-term care insurance emerged as the "fourth pillar," growing from 0.6% to 1.82%, and in 2026 a child-rearing support levy becomes the fifth pillar
What Is Happening
The fact that social insurance premiums on a ¥300,000 monthly salary have grown by over ¥120,000 annually over 35 years
"Working 17-hour night shifts, responsible for people's lives, and still taking home ¥200,000. Something is clearly wrong." — via Threads
"Gross ¥250,000, but ¥60,000 disappears to resident tax, pension, and insurance. Take-home: ¥190,000. I don't even use any of it, but if I had that ¥60,000, I'd have options." — via Threads
The feeling of "shrinking take-home pay" is not just perception — it is backed by structural reality.
Have you ever looked at your pay slip? The gap between gross and net pay — its largest component is social insurance premiums.
Take a company employee with a monthly gross salary of ¥300,000 as an example. Their social insurance premium (employee share) in 1990 was approximately ¥36,150. In 2025 it is approximately ¥46,485. Over 35 years, that is an additional ¥10,000 per month — over ¥120,000 per year.
During this period, the consumption tax was raised from 3% to 10%, triggering significant political debate. Social insurance premium increases, however, proceeded quietly every year through payroll deductions, without the kind of political event that a consumption tax hike entails.
Looking at the trend in total social insurance premium rates (employee share), the change is clear.
| Year | Health Insurance | Employees' Pension | Long-Term Care | Unemployment | Total (approx.) |
|---|---|---|---|---|---|
| 1990 | 4.1% | 7.25% | — | 0.4% | ~9.3% |
| 2000 | 4.25% | 8.675% | 0.3% | 0.35% | ~13.6% |
| 2010 | 4.73% | 8.029% | 0.75% | 0.3% | ~13.8% |
| 2025 | 5.0% | 9.15% | 0.80% | 0.35% | ~15.3% |
| 1990 | 2000 | 2010 | 2025 | |
|---|---|---|---|---|
| Health Insurance | 4.1% | 4.25% | 4.73% | 5% |
| Employees' Pension | 7.25% | 8.675% | 8.029% | 9.15% |
| Long-Term Care | — | 0.3% | 0.75% | 0.8% |
| Unemployment Ins. | 0.4% | 0.35% | 0.3% | 0.35% |
| Total | ~11.8% | ~13.6% | ~13.8% | ~15.3% |
Employee share only. Health insurance: Kyokai Kenpo standard rate. Long-term care: Category 2 insured (aged 40+); introduced in 2000.
Over 30 years, the total burden rate rose by approximately 6 percentage points. For a monthly salary of ¥300,000, this translates to an increase of approximately ¥18,000 per month.
Background and Context
The history of premium rate increases for health insurance, employees' pension, and long-term care insurance individually
Health Insurance — A Threefold History
The history of premium rates at Kyokai Kenpo (Japan Health Insurance Association) is also the history of Japan's expanding medical costs.
The rate at the founding of the system (1947) was 3.4% (combined employer and employee). It was subsequently raised in stages reflecting advances in medical technology and rising healthcare costs due to an ageing population, reaching 10.0% in 2012. Rates have been frozen since then.
Approximately threefold in 78 years. However, the freeze since 2012 is not because an "upper limit has been reached" but because "further increases became politically difficult." Healthcare costs continue to rise, and the burden is being transferred to the working-age generation through a separate channel — contributions to the latter-stage elderly healthcare system.
Employees' Pension — The Steepest Gradient
The rise in employees' pension premium rates is the steepest among all insurance types.
The rate at the founding of the system (1954) was approximately 3% (Ministry of Health, Labour and Welfare, combined employer and employee). The 2004 pension reform introduced a "fixed premium level" method, legally mandating a phased increase of 0.354% per year. This 14-year programme of increases was completed in 2017, and the rate was fixed at 18.3%.
Approximately sixfold from inception. The employee share alone amounts to 9.15% — for a monthly salary of ¥300,000, that is ¥27,450.
Long-Term Care Insurance — Rapid Growth of the "Fourth Pillar"
Long-term care insurance, established in 2000, rapidly grew in significance as the "fourth pillar" of social insurance premiums.
The long-term care insurance rate for second-category insured persons (those aged 40 and above) has risen from 0.60% (combined employer and employee) at the system's founding to 1.82% (a record high) in 2023. Threefold in just 23 years.
The premium for first-category insured persons aged 65 and above (national average) doubled from ¥2,911/month in 2000 to ¥6,225/month by fiscal 2024–2026.
Child-Rearing Support Levy — The Arrival of the "Fifth Pillar"
In April 2026, a new item will be added to social insurance premiums: the child and child-rearing support levy. The first-year rate is 0.23% (combined employer and employee), with the rate projected to reach approximately 0.4% by fiscal 2028.
The emergence of this "fifth pillar" — following health insurance, employees' pension, long-term care insurance, and unemployment insurance — shows that the structural expansion of social insurance premiums is still in progress.
Reading the Structure
Why social insurance premiums keep rising — the structural limits of the pay-as-you-go model and the "invisible tax increase"
Why Social Insurance Premiums Keep Rising
The structural reason social insurance premiums continue to rise in one direction is that Japan's social security system adopts a pay-as-you-go model.
The pay-as-you-go model is a mechanism by which premiums paid by the working-age generation at any given time are used to fund benefits for the elderly at that same time. As Japan's population ages with fewer births, the number of working-age people supporting each elderly person decreases, and the per-person burden automatically increases.
In 1990, 5.8 working-age people (aged 20–64) supported each elderly person. By 2025, the structure had changed to approximately 2.0 people per elderly person. There is no prospect of this ratio improving.
The Political Mechanism of the "Invisible Tax Increase"
There are three reasons why social insurance premium increases are politically "easy to pass."
First, the invisibility of payroll deductions. Since social insurance premiums are deducted at source, most workers are unlikely to notice changes in their burden. Consumption tax increases are felt with every purchase, whereas premium increases are hard to detect unless you read your pay slip carefully.
Second, the employer-employee split structure. Because premiums are split equally between employer and employee, the burden felt by employees is only half of the actual increase. However, the "total labour cost" including the employer's share is certainly increasing, and this indirectly affects workers as a constraint on wage increase capacity.
Third, the automatic nature of legally mandated increases. Mechanisms such as the "fixed premium level method" for employees' pension, which legally advance increases automatically, have been introduced. Since premium rates rise without annual political deliberation, parliamentary debate is unnecessary.
The Big Picture Shown by the National Burden Rate
Going beyond individual premium rates to look at the overall picture of tax plus social insurance premiums, the scale of the burden increase becomes even clearer.
According to the Ministry of Finance, the national burden rate rose from 25.7% in fiscal 1975 to 46.2% in fiscal 2025. Of this, the social security burden rate alone rose from 7.5% to 18.0% — a 2.4-fold increase.
In other words, over 50 years, the national burden rate rose by more than 20 percentage points, with social insurance premiums accounting for the majority of that increase. Considering that consumption tax increases amounted to a 7-percentage-point rise from 3% to 10%, the cumulative impact of social insurance premiums far exceeds that of consumption tax hikes.
Social insurance premiums are an "invisible tax increase." Without the political debate that accompanies a consumption tax hike, they have deducted more than ¥120,000 per year in additional payments from a company employee earning ¥300,000 a month over 35 years.
Health insurance threefold, employees' pension sixfold, long-term care insurance threefold (in just 23 years) — and in 2026, the child-rearing support levy arrives as the "fifth pillar." As long as there is no end in sight to this structural expansion, the feeling that "take-home pay never increases" is a rational conclusion.
For the structural challenges of social insurance premiums, see also "The Silent Erosion of Disposable Income" and "The Structure of the ¥1.06M Wall Abolition" for the latest policy developments.
References
Materials on the Trend in Social Insurance Premium Rates (2015)
National Burden Rate Trends (2025)
Trends in Household Tax and Social Insurance Burden Since Heisei (2025)
Overview of the Employees' Pension and National Pension Operations (2024)
