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Introduce a wealth tax and reform capital gains and inheritance taxes

Green · what the evidence says

An independent, source-checked look at Green’s policy “Introduce a wealth tax and reform capital gains and inheritance taxes” — what it would actually do across the things that affect your life. Every claim below quotes the source behind it. How this works.

Affordable housing — Little effect

minor · low confidence

This policy is primarily a tax reform targeting the very wealthy, with no direct housing mechanism. Any effect on housing affordability would depend entirely on how the government chose to spend the revenue raised — which is not specified.

The evidence

Biggest unknown: Whether any revenue raised would be directed toward social or affordable housing supply, rather than other spending priorities.

Our reading: This policy package is a tax reform aimed at raising revenue from high-wealth individuals. It has no direct mechanism affecting housing supply, rents, house prices, social housing stock, or tenure security — the core indicators for O1. Any positive effect on housing affordability would require the revenue raised to be hypothecated or directed toward housing investment, which the policy does not state. The CGT alignment in particular could theoretically affect the buy-to-let and second-home market (by making disposal less attractive), but the evidence provided does not address this channel. Given the absence of any housing-specific commitment in the policy text and no evidence linking these tax changes to housing outcomes, the effect on O1 is best characterised as negligible in direct terms, with a minor and highly uncertain indirect potential if revenues were spent on housing. Confidence is low because the causal chain from tax reform to housing affordability is entirely unspecified and evidence-free in the provided units.

Tax & the money you keep — Hurts

moderate · moderate confidence

This package of tax changes would reduce the money kept by higher earners, large capital gains recipients, and the very wealthy — the vast majority of ordinary households would be unaffected. For those who are hit, the increases are substantial, particularly the removal of the NI upper earnings limit and CGT alignment with income tax.

The evidence

Biggest unknown: How much behavioural response — especially from high-wealth individuals relocating overseas — would erode the actual tax burden imposed, and whether CGT alignment triggers large-scale asset disposals or lock-in effects.

Our reading: Every component of this policy package increases the tax burden on its target group, directly worsening their O11 position. CGT alignment with income and NIC rates would roughly double the rate on gains for higher-rate taxpayers (from ~20% to ~45%+), a large and direct reduction in money kept on asset disposals. Removing the NI Upper Earnings Limit raises the marginal rate on earnings above the current ceiling — a direct, immediate take-home pay reduction for higher earners. The annual wealth tax adds a recurring charge against accumulated assets for those above £10 million. IHT reform tightens reliefs and potentially expands the base. Crucially, the distributional incidence is narrow: capital gains are concentrated among 0.5% of adults; the wealth tax threshold of £10 million sits well above the wealthiest 1%'s average net wealth of ~£5 million (E3), meaning it applies to a tiny fraction even of the wealthy. The NI UEL removal is the broadest measure, hitting higher earners (roughly those above ~£50k). The overwhelming majority of households — those without large asset portfolios or above-UEL earnings — would see no change to their take-home pay from this package. For O11, the verdict is unambiguously 'worsens' for the affected groups. The magnitude is moderate rather than major because the measures are targeted at a small slice of the population; most households are untouched. The IFS and Wealth Tax Commission both raise serious doubts about whether the annual wealth tax raises the anticipated revenue (behavioural responses, valuation difficulty, avoidance), which creates real uncertainty about the effective burden imposed — but that uncertainty cuts against the magnitude of the burden landing, not against the direction. Where the burden does land, take-home pay and after-tax wealth are reduced.

Public finances & the next generation — Helps

moderate · moderate confidence

This package of tax reforms is designed to raise significant new revenue, which would improve fiscal sustainability — but the annual wealth tax component may raise much less than projected due to avoidance and administrative difficulties, meaning the overall fiscal gain is real but uncertain in size.

The evidence

Biggest unknown: Whether the annual wealth tax raises net revenue at all, given expert consensus that high administrative costs and behavioural responses (emigration, restructuring) could undermine its yield substantially.

Our reading: This policy package consists entirely of revenue-raising measures — new and reformed taxes on wealth, capital gains, inheritance, and high earners' NI contributions. From an O12 perspective, if these measures raise net revenue, they reduce reliance on borrowing and improve the fiscal path; if revenue falls short due to behavioural responses, the gain is smaller. The CGT and IHT reform components have the strongest independent support: the IFS endorses CGT alignment in principle and estimates up to £4.5bn; the Resolution Foundation projects ~£10bn from CGT and IHT reforms combined. These are not trivial sums relative to the fiscal position and represent funded (not borrowed) fiscal improvement. The annual wealth tax is much more uncertain. The IFS calls it 'difficult to design and counter-productive', and the Wealth Tax Commission (50+ experts) concluded an annual wealth tax would not be effective due to high administrative costs and ease of avoidance. Oxfam's £24bn estimate (advocacy source, flagged) significantly exceeds any independent institutional projection and cannot be given equal weight. The IFS's concern that wealthy individuals are internationally mobile at the very top of the distribution is specifically relevant to the wealth tax. The NI UEL removal is not quantified in the evidence but would raise additional revenue from high earners. On balance, the CGT and IHT components credibly improve fiscal sustainability at moderate scale within the parliament. The wealth tax may contribute little net revenue. The overall direction is 'improves' because even discounting the wealth tax heavily, the CGT/IHT/NI components represent real, evidenced revenue gains that reduce borrowing needs — but the magnitude is 'moderate' rather than 'major' given the real possibility the wealth tax disappoints materially.

Prosperity & living standards — Mixed picture

moderate · moderate confidence

Aligning capital gains tax with income tax rates has institutional support for improving economic efficiency, but the proposed annual wealth tax faces serious warnings from credible analysts about deterring investment and prompting capital flight. The net effect on prosperity and living standards is genuinely split across the policy's components.

The evidence

Biggest unknown: Whether behavioural responses — capital flight, reduced business investment, asset restructuring — erode the anticipated revenue and harm productive investment enough to offset any efficiency gains from CGT alignment.

Our reading: This policy bundles measures with meaningfully different implications for O13. On the CGT component, the evidence leans cautiously positive for long-term economic efficiency: the IFS explicitly supports rate alignment and argues that investment disincentive concerns are overstated for the majority of taxpayers (E21, E24). The existing large differential between CGT and income tax rates distorts how people structure income and investment (E20), and removing that distortion could improve allocative efficiency over time. However, the annual wealth tax component is a different matter. Both the IFS and the Wealth Tax Commission — the latter a body of over 50 experts — explicitly warn that an annual wealth tax is administratively costly, easily avoided, and risks prompting capital flight and reduced saving or business investment (E4, E5, E6, E8). These are direct O13 harms: reduced business investment and departure of internationally mobile capital owners would weaken productivity and firm dynamism. The IHT reforms sit between these poles: there is broad expert support for closing reliefs that allow avoidance (E26, E43), with revenue potential of several billion (E30–E33), but behavioural restructuring and valuation difficulties add uncertainty. Removing the NI Upper Earnings Limit raises marginal rates on higher earners, with ambiguous effects on labour supply at that income level; the evidence provided does not allow a confident directional claim specific to O13. The counterfactual matters: absent this policy, the existing CGT distortions persist, but so does business investment at current levels. The CGT and IHT reform components likely produce small net gains for economic efficiency; the annual wealth tax likely produces a net drag on investment and business dynamism. The overall verdict is therefore mixed: two credible improvement channels (CGT alignment, IHT reform) offset by a well-evidenced investment risk from the annual wealth tax element. Confidence is moderate because key parameters — behavioural responses, actual revenue, and how proceeds are deployed — are unresolved.

Inequality & fair shares — Helps

moderate · moderate confidence

This package of taxes on wealth, capital gains, and inheritance is squarely aimed at the richest and would, on balance, narrow the gap between them and everyone else. The biggest caveat is that the annual wealth tax element may not work as planned, but the CGT and inheritance reforms have stronger expert backing for actually delivering.

The evidence

Biggest unknown: Whether the annual wealth tax raises meaningful revenue or prompts enough avoidance and emigration to blunt its redistributive effect — the IFS and Wealth Tax Commission both flag this risk.

Our reading: Every element of this policy is targeted at the top of the wealth and income distribution. The measurable baseline makes clear that wealth and capital gains are severely concentrated: the top 1% hold a disproportionate share of household wealth, 62% of capital gains flow to 9,000 individuals, and IHT reliefs currently allow the richest estates to pay lower effective rates than moderately wealthy ones. All four policy instruments — the wealth tax, CGT alignment, IHT reform, and removing the NI Upper Earnings Limit — shift tax burden onto people at the very top, with gains (retained income/wealth) distributed across the broader population. That is the textbook mechanism for narrowing O14's gap. However, the verdict is not unqualified. The annual wealth tax component is seriously questioned by the IFS and Wealth Tax Commission on implementation grounds: avoidance, emigration of internationally mobile wealthy individuals, and valuation complexity could blunt its redistributive effect substantially. These are credible, sourced concerns from independent institutions. That said, the IFS explicitly backs CGT rate alignment — which is where the evidence on redistributive impact is strongest — and notes concerns about mobility are overstated for most CGT taxpayers. IHT reform also has strong support for closing reliefs that benefit the wealthiest estates most. On balance, the CGT and IHT elements are well-evidenced to narrow the inequality gap, and even a partially effective wealth tax adds redistributive pressure at the very top. The direction is 'improves' O14; magnitude is moderate rather than major because the wealth tax's real-world yield is genuinely uncertain and behavioural responses could erode revenue. Confidence is moderate: the CGT/IHT elements are robustly supported, but the overall package includes a contested instrument whose inequality-narrowing effect could be significantly weaker than stated.

Good work & fair pay — Mixed picture

minor · low confidence

This package of tax changes mainly hits the very wealthy and high earners, so most workers would feel little direct effect on their pay. The main risk is that higher taxes on capital gains and wealth could reduce investment and therefore job quality, though credible economists dispute how large that effect would be.

The evidence

Biggest unknown: Whether aligning CGT with income tax rates and introducing a wealth tax meaningfully reduces business investment and job creation, or whether — as the IFS suggests — those fears are largely overstated for the majority of affected taxpayers.

Our reading: For most ordinary workers — those earning below the Upper Earnings Limit (roughly £50,000) and without large capital gains or inherited wealth — this policy package has little direct effect on take-home pay or job security. The UEL removal reduces net pay only for higher earners. CGT alignment and the wealth tax target investors and the very wealthy, whose tax treatment has limited direct bearing on typical employment conditions. The indirect O4 risk is that higher taxes on capital gains and wealth could depress investment, reducing job creation or quality over time. The IFS and Wealth Tax Commission both flag this, with the latter specifically warning an annual wealth tax is easy to avoid and administratively costly. However, the IFS simultaneously argues that CGT reform fears are overstated for the bulk of taxpayers and that most CGT revenue comes from relatively immobile groups — so the investment chilling effect may be modest and concentrated. On the other side, a more neutral tax treatment of earned versus unearned income (CGT aligned with income tax) could marginally improve fairness for workers who currently face higher effective rates on labour income than wealthy individuals face on capital returns. This is a modest distributional improvement, not a direct pay or employment boost. Overall, the policy's effects on O4 are real but limited in magnitude for ordinary workers: a small improvement in fairness between earned and unearned income, offset by genuine but contested risks to investment and job creation at the top end. The evidence points both ways on the investment question with no clear resolution, justifying a 'mixed' verdict at minor magnitude.