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 ¥35,700. By 2025 they reached approximately ¥46,500 — an additional burden of about ¥130,000 per year in 35 years. The employee share of the pension rose from 7.25% to 9.15%, and long-term care insurance appeared from nothing. This article traces the full history of this "invisible tax increase" using premium rate data.
TL;DR
- The employees' pension rate (employee share) rose from 7.25% in 1990 to 9.15% in 2025, an increase of 1.90 percentage points
- For a ¥300,000 monthly salary, social insurance premiums increased by approximately ¥10,800 per month and about ¥130,000 per year compared to 1990 (an approximation: the health and long-term care rates are not traceable to a primary source)
- 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 about ¥130,000 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. Adding up the rates in the table below gives about ¥35,700 for 1990 and approximately ¥46,500 for 2025. Over 35 years, that is an additional ¥10,800 per month — about ¥130,000 per year. Read those totals as an approximation: the health and long-term care rates in the table are not currently traceable to a primary source.
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 social insurance premium rates (employee share), the change is clear.
| Year | Health Insurance | Employees' Pension | Long-Term Care | Unemployment |
|---|---|---|---|---|
| 1990 | 4.1% | 7.25% | — | 0.55% |
| 2000 | 4.25% | 8.675% | 0.3% | 0.60% |
| 2010 | 4.73% | 8.029% | 0.75% | 0.60% |
| 2025 | 5.0% | 9.15% | 0.80% | 0.55% |
| 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. | 0.55% | 0.6% | 0.6% | 0.55% |
| Total | ~11.9% | ~13.8% | ~14.1% | ~15.5% |
Employee share only. Health insurance: Kyokai Kenpo standard rate. Long-term care: Category 2 insured (aged 40+); introduced in 2000.
The pension and unemployment rates have been checked against primary sources. The pension rate, employer and employee combined, was 14.5% in 1990, 17.35% in 2000 and 16.058% in 2010 (compiled by the MHLW Pension Bureau from the former Social Insurance Agency's annual report), and has been fixed at 18.3% since 2017. The employee share of unemployment insurance is half the rate for unemployment benefits, which in fiscal 2025 is 5.5 per 1,000. The health and long-term care rates are not currently traceable to a primary source. The published series for the health insurance association goes back only to fiscal 2008, and we could not reach a primary source for the government-managed health insurance rates before that.
On the pension alone, the employee share rose from 7.25% in 1990 to 9.15% in 2025 — 1.90 percentage points, or ¥5,700 a month on a ¥300,000 salary. Long-term care insurance, which did not exist in 1990, sits on top of that.
Background & 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.
The invisible tax rise
Social insurance premiums are an "invisible tax increase." Without the political debate that accompanies a consumption tax hike, they have deducted about ¥130,000 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（このサイトの記事）" and "The Structure of the ¥1.06M Wall Abolition（このサイトの記事）" for the latest policy developments.
References
Materials on the Trend in Social Insurance Premium Rates — Cabinet Office Tax Commission (2015)
National Burden Rate Trends — Ministry of Finance (2025)
Trends in Household Tax and Social Insurance Burden Since Heisei — Daiwa Institute of Research (Shungo Koreda and Ryuta Hiraishi) (2025)
Overview of the Employees' Pension and National Pension Operations — Ministry of Health, Labour and Welfare (2024)
Further Reading
Statistics cited in this article
- 1MHLW, White Paper background data, Figure 3-4-1: Changes in pension contributions（2011） Open source
- 2MHLW, Employment insurance rates for fiscal 2025（2025） Open source
- 3Cabinet Office Tax Commission Materials（2015） Open source
- 4Ministry of Health, Labour and Welfare, Employees' Pension Insurance Overview（2024） Open source
- 5Ministry of Health, Labour and Welfare, Long-Term Care Insurance Business Status Report（2024）
- 6Ministry of Health, Labour and Welfare, 9th Long-Term Care Insurance Business Plan（2024） Open source
- 7Children and Families Agency（2026） Open source
- 8National Institute of Population and Social Security Research, Population Projections for Japan（2023） Open source
- 9Ministry of Finance, National Burden Rate Trends（fiscal 2025） Open source
