Tax on FTSE-100 Share Buybacks
Liberal Democrat · what the evidence says
An independent, source-checked look at Liberal Democrat’s policy “Tax on FTSE-100 Share Buybacks” — what it would actually do across the things that affect your life. Every claim below quotes the source behind it. How this works.
Public finances & the next generation — Hurts
minor · low confidence
The tax is likely to raise little or no net revenue because companies are expected to switch from buybacks to dividends, cutting stamp duty receipts and generating only limited additional income tax. If spending is planned against the policy's stated revenue estimate, the resulting shortfall worsens public finances.
The evidence
- The policy aims to raise revenue by taxing FTSE-100 share buybacks at 4% to incentivise productive investment. — libdems.org.uk (manifesto) — “Introduce a 4% tax on the share buyback schemes of FTSE-100 listed companies, to incentivise productive investment, job creation and economic growth”
- Buybacks have grown substantially, accounting for 42% of capital returned by FTSE 350 issuers in 2022–2024, up from 20% in 2017–2019. — fca.org.uk (media) — “buybacks have surged since COVID-19, accounting for 42% of capital returned by FTSE 350 issuers in 2022-2024, up from 20% in 2017-2019”
- If companies switch from buybacks to dividends, approximately £250m in stamp duty revenue would be lost. — taxpolicy.org.uk (media) — “Ending buybacks would result in an estimated loss of approximately £250 million in stamp duty revenue”
- Additional income tax from increased dividends is projected at less than £400m, insufficient to fully offset the stamp duty loss and far below a £1.4bn revenue target. — taxpolicy.org.uk (media) — “this is projected to be less than 0.8% of buyback values, or about £400 million, potentially offsetting some of the stamp duty loss but not delivering substantial net new revenue”
- Foreign investors hold almost 60% of UK listed shares and are not typically subject to UK tax on dividends or capital gains, sharply limiting revenue from any dividend substitution. — taxpolicy.org.uk (media) — “For foreign investors, who hold almost 60% of UK listed shares, neither dividends nor capital gains are typically taxed by the UK, further reducing the revenue potential from this policy”
- Academic research found no relationship between share repurchases and investment levels for FTSE 350 companies, suggesting the tax would not redirect capital into productive investment. — assets.publishing.service.gov.uk (government) — “the 2018 PwC report specifically for the UK context found "no relationship between share repurchases and investment" for FTSE 350 companies, suggesting that buybacks are driven by separate financial considerations like s…”
Biggest unknown: Whether the fiscal projections from taxpolicy.org.uk accurately capture behavioural substitution, and whether the government would commit spending against the stated revenue figure.
Our reading: The sole O12 mechanism of this policy is the revenue it generates. The stated rationale implies a meaningful fiscal contribution, with the policy framing itself as funding productive investment. However, the fiscal arithmetic from taxpolicy.org.uk (E8, E9, E11) shows why that expectation is unlikely to be met: companies will rationally substitute dividends for buybacks to avoid the tax, eliminating ~£250m in existing stamp duty receipts while generating at most ~£400m in additional income tax — and only from the roughly 40% of UK-listed shares held by taxable UK residents. The net fiscal effect is likely to be negligible or marginally negative. Furthermore, the government source evidence (E37) shows buyback decisions are independent of investment decisions, so the policy's stated mechanism for redirecting capital into productive use has no evidential support. If the stated £1.4bn revenue estimate is embedded in spending plans — as is standard when a tax is proposed as a funding mechanism — the shortfall worsens the fiscal position relative to the plan. This is a 'worsens' verdict, minor in magnitude: the policy does not create a large new liability, but it likely delivers a small net fiscal cost (stamp duty lost, investment redirection absent) rather than the claimed improvement. Confidence is low because the key fiscal projections rely on taxpolicy.org.uk, which is not on the institutional allowlist; however, the underlying logic (foreign-holder non-taxability, stamp duty arithmetic) is grounded in verifiable structural facts, and no credible counter-estimate appears in the provided evidence.
Prosperity & living standards — Little effect
minor · moderate confidence
A 4% tax on FTSE-100 share buybacks is unlikely to shift business investment or living standards meaningfully, because the evidence suggests companies would simply switch to paying dividends instead, and a government study found no link between buybacks and investment levels anyway. The main effect is probably revenue near zero rather than a boost to productive investment.
The evidence
- The policy aims to introduce a 4% tax on FTSE-100 share buybacks to incentivise productive investment, job creation and economic growth. — libdems.org.uk (manifesto) — “Introduce a 4% tax on the share buyback schemes of FTSE-100 listed companies, to incentivise productive investment, job creation and economic growth.”
- Share buybacks have grown substantially, accounting for 42% of capital returned by FTSE 350 issuers in 2022–2024, up from 20% in 2017–2019. — fca.org.uk (media) — “buybacks have surged since COVID-19, accounting for 42% of capital returned by FTSE 350 issuers in 2022-2024, up from 20% in 2017-2019”
- Independent analysts, including the IFS, expect companies would largely switch from buybacks to dividends, meaning the tax raises little or no revenue. — libdemwatch.org (media) — “Stuart Adam, a senior economist at the IFS, stated he would be "surprised if a 4% tax on share buybacks in the UK raised much revenue," expecting companies to simply switch to dividends”
- Because dividends and buybacks are substitutes for returning capital, companies would choose the more tax-efficient route. — libdemwatch.org (media) — “dividends and buybacks are often considered substitutes for returning capital to shareholders, and companies would opt for the more tax-efficient method”
- A 2018 PwC report for the UK government found no relationship between share repurchases and investment for FTSE 350 companies. — assets.publishing.service.gov.uk (government) — “a 2018 PwC report for the Department for Business, Energy & Industrial Strategy, focusing on FTSE 350 companies between 2007 and 2017, found "no relationship between share repurchases and investment"”
- Investment decisions are driven by factors such as excess cash and undervalued equity, not buyback activity. — assets.publishing.service.gov.uk (government) — “investment decisions are made independently, driven by factors such as excess cash and undervalued equity, rather than being directly linked to buyback activity”
- The IFS senior economist questioned the clear justification for the policy, calling it a particularly distortionary form of tax rise. — libdemwatch.org (media) — “He also questioned the "clear justification for the policy," calling it a "particularly distortionary form of tax rise"”
- The UK is a low investment nation, with business investment a key factor behind weak productivity growth and stagnant living standards. — economy2030.resolutionfoundation.org (institutional) — “The Resolution Foundation frequently highlights the UK as a "low investment nation," with business investment being a key factor behind weak productivity growth and stagnant living standards”
Biggest unknown: Whether any companies, unable to easily substitute dividends for buybacks, would redirect capital into productive investment rather than other financial manoeuvres.
Our reading: The policy's stated aim is to shift capital from share buybacks into productive investment. For O13, this would matter only if the tax actually caused companies to invest more productively rather than simply returning capital to shareholders through dividends instead. The evidence undermines both transmission channels. First, credible independent analysis (IFS) projects that virtually all affected companies would switch to dividends rather than invest more, meaning the tax raises close to nothing and redirects nothing into real economic activity. Second, and more fundamentally, the empirical baseline from a UK government-commissioned PwC study covering a decade of FTSE 350 data found no relationship between buyback activity and investment: companies invest based on their own financial circumstances, not whether they run buyback programmes. The Resolution Foundation confirms the UK has a chronic underinvestment problem, but does not identify a buyback tax as a solution. If companies simply substitute dividends for buybacks, the tax has no impact on investment, productivity, business dynamism, or real living standards — the core O13 indicators. There is a small possible distortionary cost: the IFS flags it as a 'particularly distortionary' intervention, and a stamp duty loss of ~£250m is projected. Against this, no credible mechanism exists by which the tax fires at population-scale to improve O13. The direction is therefore negligible rather than improves: the policy points at a real problem (low investment) but the mechanism does not plausibly fire given the evidence that buybacks and investment are independently determined and that companies have an easy tax-efficient exit via dividends.
Inequality & fair shares — Little effect
n/a · moderate confidence
A tax on share buybacks sounds like it could take money from wealthy shareholders and redirect it, but the evidence strongly suggests companies would simply switch to paying dividends instead — leaving shareholder wealth largely intact and raising little revenue to redistribute. Without a material revenue stream or a proven investment effect, the gap between rich and poor is unlikely to narrow.
The evidence
- The policy proposes a 4% tax on share buybacks by FTSE-100 companies to incentivise investment and job creation. — libdems.org.uk (manifesto) — “Introduce a 4% tax on the share buyback schemes of FTSE-100 listed companies, to incentivise productive investment, job creation and economic growth.”
- IFS analysts expect companies to switch to dividends rather than pay the tax, meaning little or no revenue would be raised. — libdemwatch.org (media) — “Stuart Adam, a senior economist at the IFS, stated he would be "surprised if a 4% tax on share buybacks in the UK raised much revenue," expecting companies to simply switch to dividends”
- Tax commentator Dan Neidle also predicted the tax would raise little or nothing for the same reason. — libdemwatch.org (media) — “suggesting the tax would raise "little or nothing" for the same reason”
- Companies are predicted to switch to dividends because dividends and buybacks are substitutes for returning capital to shareholders. — libdemwatch.org (media) — “dividends and buybacks are often considered substitutes for returning capital to shareholders, and companies would opt for the more tax-efficient method”
- A 2018 PwC report for the UK government found no relationship between share repurchases and investment for FTSE 350 companies. — assets.publishing.service.gov.uk (government) — “a 2018 PwC report for the Department for Business, Energy & Industrial Strategy, focusing on FTSE 350 companies between 2007 and 2017, found "no relationship between share repurchases and investment"”
- Investment decisions are driven by factors like excess cash and undervalued equity, not by buyback activity. — assets.publishing.service.gov.uk (government) — “investment decisions are made independently, driven by factors such as excess cash and undervalued equity, rather than being directly linked to buyback activity”
- The IFS analyst questioned the clear justification for the policy, calling it a particularly distortionary form of tax rise. — libdemwatch.org (media) — “He also questioned the "clear justification for the policy," calling it a "particularly distortionary form of tax rise"”
Biggest unknown: Whether companies would actually increase productive investment (narrowing inequality through jobs and wages) rather than simply paying dividends — but the evidence says buybacks and investment decisions are already independent.
Our reading: O14 asks whether the gap between richest and rest widens or narrows. A buyback tax could in principle narrow the gap through two channels: (1) raising revenue that is redistributed to lower-income groups, or (2) shifting corporate behaviour toward investment that raises wages and employment. On the revenue channel, the evidence is strongly one-directional: IFS economists and tax analysts project companies will substitute dividends for buybacks, rendering the tax largely avoidable and raising minimal revenue. If negligible revenue is raised, there is no redistribution mechanism and no narrowing of the income or wealth gap. On the investment channel, the UK government's own commissioned PwC research found no relationship between buybacks and investment for FTSE 350 companies. Investment decisions are driven by separate factors. This directly undercuts the stated rationale and means the policy is unlikely to generate the jobs and wage growth that would narrow inequality from the bottom up. Shareholders would still receive capital returns, just via dividends rather than buybacks. Their wealth position is largely unchanged. The distributional effect on the gap between top and bottom is therefore not evidenced to materialise at any meaningful scale. Direction is therefore 'negligible' with magnitude 'n/a': the mechanism by which the gap would narrow simply does not fire.
Good work & fair pay — Little effect
minor · moderate confidence
A tax on FTSE-100 share buybacks is unlikely to shift investment or create better jobs, because companies would simply switch to paying dividends instead — avoiding the tax without changing how much they actually invest. The evidence finds no link between buybacks and investment decisions in the first place.
The evidence
- The policy aims to introduce a 4% tax on FTSE-100 share buybacks to incentivise productive investment, job creation and economic growth. — libdems.org.uk (manifesto) — “Introduce a 4% tax on the share buyback schemes of FTSE-100 listed companies, to incentivise productive investment, job creation and economic growth.”
- Credible analysts expect companies would largely switch to dividends rather than pay the tax, generating little new revenue or investment. — libdemwatch.org (media) — “Stuart Adam, a senior economist at the IFS, stated he would be "surprised if a 4% tax on share buybacks in the UK raised much revenue," expecting companies to simply switch to dividends”
- The IFS economist questioned the clear justification for the policy and called it a particularly distortionary form of tax rise. — libdemwatch.org (media) — “He also questioned the "clear justification for the policy," calling it a "particularly distortionary form of tax rise"”
- A 2018 PwC report for the UK government found no relationship between share repurchases and investment for FTSE 350 companies. — assets.publishing.service.gov.uk (government) — “a 2018 PwC report for the Department for Business, Energy & Industrial Strategy, focusing on FTSE 350 companies between 2007 and 2017, found "no relationship between share repurchases and investment"”
- Investment decisions are driven by factors such as excess cash and undervalued equity, not by buyback activity. — assets.publishing.service.gov.uk (government) — “investment decisions are made independently, driven by factors such as excess cash and undervalued equity, rather than being directly linked to buyback activity”
- If companies switch to dividends, stamp duty revenue would fall by around £250 million, partially offset by additional income tax from dividends. — taxpolicy.org.uk (media) — “Ending buybacks would result in an estimated loss of approximately £250 million in stamp duty revenue”
Biggest unknown: Whether any residual deterrent effect on buybacks might eventually redirect some capital toward productive investment and hiring, rather than being absorbed entirely by a shift to dividends.
Our reading: The policy's stated goal is to redirect corporate capital from buybacks into productive investment and job creation. But this causal chain rests on two assumptions the evidence does not support. First, the tax would not eliminate buybacks as a return vehicle — companies would simply substitute dividends, which are economically equivalent for shareholders and already the more tax-efficient route for many investors. IFS senior economists and other analysts agree on this substitution effect, predicting minimal revenue and minimal behavioural change in investment. Second, and more fundamentally, the premise that buybacks crowd out investment is contradicted by the only UK-specific empirical study cited: a PwC analysis of FTSE 350 companies found no relationship between repurchases and investment, with investment driven by surplus cash and perceived undervaluation — independent of buyback decisions. On O4 specifically, the policy's mechanism for improving pay and job quality is indirect: tax discourages buybacks → companies invest more → more or better jobs. Both links in that chain are weak. The substitution to dividends breaks the first link; the evidence on investment independence breaks the second. The Resolution Foundation confirms UK underinvestment is a real problem affecting living standards and productivity, but does not endorse a buyback tax as a credible solution. Net effect on O4 — pay, job security, employment quality — is therefore negligible. The magnitude is scored minor rather than negligible because a small distortionary effect on capital allocation cannot be ruled out, and because any residual fiscal drag on FTSE-100 companies could marginally affect hiring at the margin, though no evidence directly supports this pathway.
Security in later life — Little effect
minor · moderate confidence
This policy aims to raise money by taxing share buybacks, but credible analysts expect companies to simply switch to paying dividends instead, generating little or no extra revenue. Without meaningful revenue, there is nothing to improve pensions, social care, or other supports for older people.
The evidence
- The policy would introduce a 4% tax on FTSE-100 share buybacks to incentivise productive investment and growth. — libdems.org.uk (manifesto) — “Introduce a 4% tax on the share buyback schemes of FTSE-100 listed companies, to incentivise productive investment, job creation and economic growth.”
- IFS senior economist Stuart Adam said he would be surprised if the tax raised much revenue, expecting companies to simply switch to dividends. — libdemwatch.org (media) — “Stuart Adam, a senior economist at the IFS, stated he would be "surprised if a 4% tax on share buybacks in the UK raised much revenue," expecting companies to simply switch to dividends”
- Switching to dividends is rational because dividends and buybacks are near-substitutes for returning capital to shareholders. — libdemwatch.org (media) — “dividends and buybacks are often considered substitutes for returning capital to shareholders, and companies would opt for the more tax-efficient method”
- A PwC analysis of FTSE 350 companies found no relationship between share repurchases and investment, suggesting the tax would not redirect capital into productive investment. — assets.publishing.service.gov.uk (government) — “the 2018 PwC report specifically for the UK context found "no relationship between share repurchases and investment" for FTSE 350 companies, suggesting that buybacks are driven by separate financial considerations like s…”
- Ending buybacks would cost around £250 million in stamp duty revenue, partially offsetting any gains. — taxpolicy.org.uk (media) — “Ending buybacks would result in an estimated loss of approximately £250 million in stamp duty revenue”
Biggest unknown: Whether FTSE-100 companies would actually redirect capital into productive investment rather than dividends, and whether any net fiscal gain would be earmarked for later-life spending.
Our reading: O8 encompasses state pension adequacy, pensioner poverty, social care access, and support for carers. This policy has no direct mechanism touching any of these. Its only plausible route to improving O8 outcomes is fiscal: if it raised substantial revenue, that money could in principle fund social care or pension uplifts. But the evidence firmly undermines this channel. The IFS and independent commentators expect companies to switch from buybacks to dividends, circumventing the tax entirely and leaving revenue close to zero. The stamp duty loss of ~£250 million would compound any fiscal shortfall. The investment channel — the stated goal — is also weak: the PwC research found no link between buyback levels and investment decisions for FTSE 350 firms. With negligible revenue generated and no direct effect on pensions or care, the marginal effect on security in later life is negligible. The small residual possibility of some revenue materialising and being directed to later-life spending is too speculative to shift the verdict.