Policies·jp_nisa_reform_2024

Japan — NISA permanent tax-free investment account reform (2024)

JPN·2024 – present·enacted 2024-01-01·LDP-Komeito (Kishida administration)candidate

What the policy did

New NISA (Nippon Individual Savings Account) regime effective 1 January 2024 under the 2023 tax reform package, replacing the prior time-limited general NISA and Tsumitate NISA with a permanent, expanded single framework. Combines an annual "tsumitate" (accumulation) allowance of ¥1.2m and a "growth" allowance of ¥2.4m, totalling ¥3.6m per year, with a ¥18m lifetime holding cap. Capital gains, dividends, and distributions on assets held within NISA accounts are exempt from the standard 20.315% capital-income tax. Positioned as the centrepiece of Kishida's "Doubling Asset-Based Income Plan" (shisan shotoku baizō keikaku), shifting household portfolios from ¥2,000tn+ of mostly cash-and-deposits toward equities. NISA account openings and net equity inflows accelerated sharply in 2024.

Policy-content fingerprint — what this policy moved, on which axes

Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.

intended

↓

tax capital

fiscal.tax_capital

Taxation of capital income (dividends, capital gains, inheritance, wealth). Distinct from corporate rate.

decreased · moderate

lower capital income tax

Permanent tax-free treatment of capital gains, dividends, and distributions within ¥18m lifetime cap lowers effective household capital-income taxation.

Enacted by

japan_kishida_ldp_2021_2024

Empirical evidence — linked hypotheses

Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".

Wealth taxes produce a three-order causal chain.

wealth_tax_capital_flight_revenue_yield_gapinferred

viafiscal.tax_capital

INCONCLUSIVE_DATA_PENDING — FRA not in panel

run pending

In an OECD-country panel 2014-2024, reductions in the top statutory capital- gains tax rate predict higher subsequent gross fixed capital formation as a share of GDP and higher business-startup rates, controlling for corporate-tax rates, interest rates, and institutional quality.

capital_gains_tax_cut_investment_response_panelinferred

viafiscal.tax_capital

SUPPORTED — coef=-0.1981 (sign matches claim -), p=0.00535

supported

The 2003 Jobs and Growth Tax Relief Reconciliation Act (JGTRRA), which cut US qualified-dividend and long-term-capital-gains rates to 15 percent, shifted the composition of top-1 pre-tax income toward dividend and capital-gains realisations between 2003 and 2007, raising the top-1 share by 1.5 to 3 percentage points relative to the pre-2003 trend.

tax_inequality_bush_2003_dividend_capgains_cutinferred

viafiscal.tax_capital

PARTIAL — shape=ITS, opposite sign but small (mean_gap=-0.6187, z=-1)

partial

Macron's 2017 reform replacing the French ISF (Impot de Solidarite sur la Fortune) with the IFI (real-estate-only wealth tax) and the introduction of the 30 percent flat tax (PFU) on capital income produced a measurable rise in the French top-1 pre-tax income share over 2018-2022 relative to Eurozone synthetic control, but a smaller-than-projected fall in HNW emigration once concurrent CRS enforcement is accounted for.

tax_inequality_france_2017_isf_to_ifi_abolitioninferred

viafiscal.tax_capital

PARTIAL — mean_gap=+1.331, |gap|/pre_sd=2.2, p_perm=1 (gap below 0.5×pre_sd or placebo p≥0.10)

partial

The 1986 Tax Reform Act (TRA86) — which paired a top-rate cut from 50 to 28 percent with substantial base-broadening (passive-loss limits, AMT expansion, capital-gains rate harmonisation) — produced a smaller persistent top-1 income share response than ERTA 1981 once the one-off 1986-1988 realisation spike from capital-gains reclassification is removed.

tax_inequality_reagan_1986_base_broadening_neutralityinferred

viafiscal.tax_capital

REFUTED — shape=ITS, sign + OPPOSITE claim -, mean_gap=+1.194, z=+3.4

refuted

Piketty's r > g dynamic post-1980 produced wealth-to-income ratios reaching or exceeding pre-1914 levels in major OECD economies, consistent with social-democratic claims about structural inequality drift absent policy intervention.

r_minus_g_wealth_income_ratio_post_1980inferred

viafiscal.tax_capital

INCONCLUSIVE_DATA_PENDING — treatment 'realised_r_minus_g_gap' has no within-country variation under country fixed effects

run pending

The 1981 Mitterrand wealth tax (Impot sur les Grandes Fortunes, suspended 1986, reinstated 1988 as ISF) produced a measurable but modest reduction in the French top-1 wealth share over 1981-1985 relative to the synthetic control of comparable continental European economies, with capital-flight attrition smaller than the Macron-era political narrative implied.

tax_inequality_france_1981_wealth_tax_top_shareinferred

viafiscal.tax_capital

INCONCLUSIVE_DATA_PENDING — insufficient pre-period coverage (years=6, donors=0)

run pending

Norway's continued retention of an annual wealth tax (formuesskatt) through 2024 — at rates of 0.85-1.1 percent on net wealth above NOK 1.7M — is associated with a top-1 wealth share trajectory that lies below the Nordic-ex-Norway synthetic counterfactual by at least 1 percentage point over 2010-2024, without a large register-based HNW emigration response prior to the 2022 rate increase.

tax_inequality_norway_wealth_tax_retentioninferred

viafiscal.tax_capital

PARTIAL — mean_gap=+2.245, |gap|/pre_sd=3.7, p_perm=1; claim direction ambiguous

partial

Similar historical policies

Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.

Finnish dual-income tax reform 1993

Ireland Capital Gains Tax reduction 40%→26% (Finance Act 1997)

Foermoegenhetsskatt (wealth tax) abolition 2007

SWE·2007