How Many Income Walls Are There? — The Break-Even Points at ¥1.03M, ¥1.30M, ¥1.50M, and ¥2.01M

The phrase "income wall" has rapidly moved to the center of Japan's policy debate in recent years. When a part-time worker's annual earnings cross certain thresholds, the resulting increase in tax and social insurance burdens can actually reduce their take-home pay—a "reversal" that significantly distorts labor market behavior.

According to a 2025 survey by Nomura Research Institute (NRI), 56.7% of part-time female workers reported deliberately adjusting their working hours. In other words, more than half of Japan's part-time female workforce is intentionally capping their hours to avoid crossing one of these thresholds—even though they could work more.

What makes this problem serious is that there is not just one wall. There are five: ¥1.03 million, ¥1.06 million, ¥1.30 million, ¥1.50 million, and ¥2.01 million. These walls span three separate policy systems—the income tax code, social insurance, and the spousal deduction—and each operates through a different mechanism, with a different degree of "pain" when crossed.

Income Tax

Social Insurance

Spouse Deduction

Reversal Zone

Wall	System	Take-Home	Reform
103	Income Tax	103	→ Under discussion: raise to ¥1.60M/1.78M
106	Social Insurance	Reversal → 91	Abolished Oct 2026
130	Social Insurance	Reversal → 107	Biggest reversal — ~¥200K drop
150	Spouse Deduction	135	→ Raised to ¥1.60M
201	Spouse Deduction	170	Deduction gradually phases out

The 103 wall is under legislative discussion to raise to 160. The 106 wall will be eliminated in Oct 2026 by abolishing the wage requirement. The 130 wall structurally remains.

Between 2025 and 2026, a series of reforms is targeting these walls: raising the ¥1.03M threshold, abolishing the ¥1.06M wall, and changing the assessment method for the ¥1.30M wall. But can structural problems be resolved by adjusting individual thresholds? This article maps the mechanics and break-even points of each wall and examines the deeper design flaws that reforms have yet to address.

The ¥1.03M Wall — The Entry Point of Taxation

The most widely known of Japan's income walls is the ¥1.03 million threshold. This is the minimum taxable income for income tax purposes—the point at which the combination of the ¥550,000 employment income deduction and the ¥480,000 basic deduction is exhausted, and income tax begins to apply.

Crossing ¥1.03 million by even one yen does not cause a sudden drop in take-home pay. Japan uses a progressive marginal tax rate: only the portion above ¥1.03M is taxed, at the minimum rate of 5%. At an annual income of ¥1.10 million, income tax would be just (¥1.10M − ¥1.03M) × 5% = ¥3,500. The ¥1.03M wall is less a "cliff" than the "gentle start of a slope."

Yet it exerts a powerful restraint on employment behavior because many employers tie their "family allowance" or "dependent allowance" payments to the ¥1.03M threshold. When those allowances amount to ¥10,000–¥20,000 per month, a worker crossing the threshold risks losing ¥120,000–¥240,000 per year in benefits—far exceeding the income tax owed.

The 2025 tax reform raised the basic deduction from ¥480,000 to ¥580,000, lifting the minimum taxable income to ¥1.60 million. A further increase to ¥680,000 is planned for 2026, which would raise the threshold to ¥1.78 million—the largest adjustment in roughly half a century.

The ¥1.06M Wall — The First Social Insurance Gate

The ¥1.06 million wall stems from the monthly wage threshold of ¥88,000 (approximately ¥1.06M per year) that triggers mandatory enrollment in employer-based social insurance (kosei nenkin pension and health insurance). Introduced by the 2016 coverage expansion, crossing this wall generates approximately ¥150,000 in new annual social insurance premiums, pushing net income back down to around ¥910,000.

This wall will be abolished in October 2026. The wage threshold will be eliminated entirely, and all short-hour workers logging 20 or more hours per week will be required to enroll in kosei nenkin and health insurance. The "¥1.06M wall" will be replaced by a "20-hours-per-week wall."

The change is expected to affect roughly 2 million workers. The Ministry of Health, Labour and Welfare has introduced a transitional measure that reduces premiums by up to 50% for three years—but there is no policy in place to address the "second round of take-home pay reduction" that will occur when the transitional period ends.

The ¥1.30M Wall — The Largest Take-Home Pay Reversal

Of the five walls, the ¥1.30 million wall is the most painful. This is the threshold for qualifying as a dependent under a spouse's employer-based health insurance. Crossing ¥1.30M means being removed from the spouse's coverage and having to enroll independently in the National Health Insurance (kokumin kenkou hoken) and the National Pension (kokumin nenkin).

The financial impact is substantial. Combined National Health Insurance premiums and National Pension contributions add up to approximately ¥200,000 in new annual costs. In concrete terms, a worker earning ¥1.35 million per year ends up with less take-home pay than one earning ¥1.29 million. To recover the net income equivalent of ¥1.29 million, earnings need to reach roughly ¥1.55–¥1.60 million. A take-home pay reduction of approximately ¥200,000 is an enormous blow for workers whose monthly earnings are in the ¥100,000 range.

From April 2026, the method for assessing the ¥1.30M threshold will change. The current standard—based on recent actual earnings—will shift to "projected annual income based on the employment contract," reducing the risk of losing dependent status because of a temporary surge in overtime. However, the ¥1.30M threshold itself remains unchanged; the structural wall persists.

The ¥1.50M Wall — The Full Spousal Deduction Ceiling

The ¥1.50 million wall marks the upper limit at which the spousal special deduction (haiguusha tokubetsu koujyo) applies at its maximum value of ¥380,000. Once the dependent spouse's income exceeds ¥1.50M, the deduction begins to phase out gradually.

Like the ¥1.03M wall, this one is a "slope" rather than a "cliff." Crossing ¥1.50M does not immediately eliminate the deduction; it tapers off as income rises, producing a gradual rather than abrupt increase in the primary earner's tax burden.

The 2025 reform raised this full-deduction ceiling to ¥1.60 million—effectively pushing the wall back by ¥100,000.

The ¥2.01M Wall — The Point Where the Spousal Deduction Disappears

Above ¥2,016,000, the spousal special deduction phases out entirely. This is the final wall.

However, the reduction between ¥1.50M and ¥2.01M is gradual (slope-type), and there is no sudden drop in take-home pay at the ¥2.01M point itself. Of the five walls, this is the least wall-like in practical terms. It functions more as a psychological marker—the point at which workers decide, "I've come this far; I'll fully leave the dependent framework and work in earnest."

The 2025–2026 Reforms at a Glance

The Cabinet Secretariat is advancing the following package of measures:

• ¥1.03M wall: Minimum taxable income raised to ¥1.60M (2025) → ¥1.78M (2026)
• ¥1.06M wall: Abolished in October 2026; replaced by a 20-hours-per-week standard, with a 3-year transitional period
• ¥1.30M wall: Assessment method changed to "projected income under the employment contract" from April 2026; threshold remains at ¥1.30M
• ¥1.50M wall: Full-deduction ceiling raised to ¥1.60M (2025)

Each measure represents progress. But taken together, they amount to "moving the wall" or "knocking one down"—they do not touch the underlying structure that gives rise to walls in the first place.

Why a Chain of Walls Cannot Be Fixed One Wall at a Time

The root cause of income walls is that Japan's tax and social insurance systems were designed around the household as the unit of calculation. The spousal deduction, the dependent status certification, the Category 3 insured persons (daisan gou hihokensha) scheme—all were built on the assumption that the standard household consists of one full-time earner and one dependent spouse.

Breaking down one wall just shifts the problem to the next. Raising the ¥1.03M threshold to ¥1.78M concentrates work-hour adjustment pressure on the ¥1.30M wall. Abolishing the ¥1.06M wall does nothing to change the behavior of workers trying not to exceed the ¥1.30M dependent-status threshold. This is a whack-a-mole structure.

The 56.7% work-hour adjustment rate documented in the NRI survey reflects both the multiplicity of the walls and the fact that the financial hit at each wall is large enough for workers to take seriously. When there is only one wall, crossing it might make sense. But when five walls stand in a row—and clearing each one generates a new set of costs—the most rational strategy is often to avoid all of them.

International Comparison — The Effect of Individual-Based Taxation

Household-based system design is not unique to Japan, but countries that have already reformed their systems offer instructive lessons.

The United Kingdom shifted from joint spousal taxation to individual-based taxation in 1990. Research by CEPR (VoxEU) found that following this transition, the employment rate of married women rose by 4.1%. Eliminating deductions tied to a spouse's income removed the structural penalty on paid work.

Sweden introduced individual-based taxation in 1971 and has since maintained consistently high rates of female labor force participation. These cases illustrate a basic principle of social security design: institutional rules shape behavior.

The Structural Prescription and the Political Reality

The logical conclusion is clear. To truly dissolve the chain of walls, Japan would need to shift from household-based to individual-based design. That would require three concrete reforms: abolishing the spousal deduction and consolidating it into a universal basic deduction; abolishing the Category 3 insured persons scheme and applying social insurance contributions to all adults; and abolishing dependent-status certification in favor of individual enrollment in social insurance.

The political cost, however, is enormous. Approximately 9 million people are enrolled under the Category 3 scheme. Roughly 10 million households benefit from the spousal deduction. Any reform that asks these households to bear higher short-term costs carries substantial electoral risk. The result is a policy of gradualism—nudging the walls slightly, one at a time.

The 2025–2026 reforms are an extension of that gradualism. Raising the ¥1.03M threshold to ¥1.78M, abolishing the ¥1.06M wall, changing the ¥1.30M assessment method—these are all steps forward. But as long as the household-based design philosophy remains intact, the walls do not disappear; they simply move.

Japan's income walls also serve as a diagnostic device, revealing whom the social security system was originally designed to serve. A system built for single-earner households is malfunctioning in a society where dual-income households are the norm. The statistic that 56.7% of part-time female workers are adjusting their hours quantifies the gap between institutional design and social reality. The question is not how many centimeters to shift the walls—it is how to redesign the room that contains them.

• The Structure Behind the Abolition of the ¥1.06M Wall — A Social Insurance Turning Point for 2 Million Workers
• Structural Shifts in an Era of 21 Million Non-Regular Workers — Has "Equal Pay for Equal Work" Narrowed the Gap?
• Pension Generational Inequality — Why the "Paying More Than You Get" Generation Is Structurally Inevitable

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References

FY2026 Tax Reform Outline (令和8年度税制改正大綱) — Ministry of Finance, Japan. Ministry of Finance

Income Wall Support and Reinforcement Package (年収の壁・支援強化パッケージ) — Ministry of Health, Labour and Welfare. Ministry of Health, Labour and Welfare

Survey on Work-Hour Adjustment Practices Among Part-Time Female Workers (パート女性の就業調整に関する実態調査) — Nomura Research Institute. NRI

Income Wall Countermeasures (年収の壁対策) — Cabinet Secretariat. Cabinet Secretariat

Tax and social insurance benefits for low-income spouses stand as obstacles to women's employment — CEPR. VoxEU

Further Reading