The fiscal arithmetic is brutal. Government tax receipts amount to roughly £1.1 trillion annually — approximately 39 per cent of GDP. Spending exceeds this by roughly £100 billion each year, requiring government borrowing to close the gap. This gap cannot be closed by tax increases alone; raising the tax take from 39 per cent to 49 per cent of GDP would destroy growth and be politically impossible. Yet it also cannot be closed indefinitely by borrowing, as interest payments on accumulated debt crowd out spending on services and investment.
The political instinct is to reach for two tools: cut spending or raise taxes. Both are economically damaging when pursued without constraint. Indiscriminate spending cuts destroy public services and investment. Blanket tax increases weigh on growth, discourage work and investment, and reduce the very tax base they are meant to expand. Yet there is a third path: targeted tax cuts financed by welfare reforms that simultaneously reduce spending and stimulate growth.
The CRPF proposes immediately implementing £12 billion in fully funded annual tax cuts. These are not financed by borrowing or by vague hopes of growth. They are financed by specific welfare reforms that deliver £15.6 to 27 billion in savings over the medium term. The tax cuts stimulate disposable income, savings, and investment — the components necessary to generate growth. Growth, in turn, expands the tax base and reduces borrowing pressure. The cuts are not a cost to the Exchequer; they are an investment in growth that pays for itself.
The fiscal problem restated
To understand the case for funded tax cuts, begin with the growth constraint. Current GDP is roughly £2.8 trillion. To raise an additional £100 billion in tax revenue (equal to current borrowing) at the existing 39 per cent tax rate, GDP must grow by roughly 3.6 per cent, yielding an additional £100 billion in taxable activity. This is ambitious but achievable if growth-supporting policies are implemented. However, the current policy framework does not support growth; it constrains it. High taxes on work and investment, combined with welfare traps that punish earning additional income, depress the supply-side drivers of growth.
The counterfactual is worth considering. Growth of 3-4 per cent annually is possible but not automatic. It requires policies that encourage investment, reward work, and allocate resources toward productive rather than redistributive uses. Tax policy is one such tool. Cutting taxes on earnings increases the reward for work and the after-tax return on investment. This is not trickle-down mythology; it is standard economics: incentives shape behavior, and lower taxes on productive activity increase productive activity.
The welfare system is the lever for funding cuts. Current welfare spending exceeds £200 billion annually across means-tested benefits, housing support, disability allowances, and social care. Much of this is well-designed and targeted, providing genuine support to those unable to work. But portions are economically distortive, creating marginal tax rates that exceed 100 per cent — individuals lose benefits as they earn, making work financially irrational. For every additional pound earned, some individuals lose 50 pence in benefits, plus income tax, plus National Insurance. The combined marginal rate exceeds 100 per cent.
The CRPF’s analysis identifies welfare reforms that would reduce spending by £15.6 to 27 billion annually depending on implementation intensity. These include: means-testing certain universal benefits to focus support on those most in need; restructuring housing support to emphasize ownership over rental subsidy; reforming disability assessments to ensure that support goes to those with genuine incapacity; and integrating various benefits into simplified, non-stigmatizing payment systems. None of these are draconian cuts. All are based on international evidence from countries that have successfully reformed welfare while maintaining support for vulnerable populations.
The tax cut proposal
Immediate tax cuts of £12 billion annually would be split between two initiatives. First, raise the higher rate income tax threshold from £50,270 to roughly £65,000 annually. This reduces the tax take from higher earners by £1.5 billion annually. The rationale is to reduce the disincentive to work and earn among the top 5-10 per cent of earners — those most likely to be mobile, most likely to invest in business development, and most likely to be discouraged by high marginal rates. Britain’s top income tax rate of 45 per cent, combined with National Insurance contributions, yields an effective marginal rate approaching 50 per cent. This is not unacceptably high by historical standards, but it is higher than most peer nations. Reducing the effective marginal rate encourages entrepreneurship and reduces the incentive to structure income through avoidance schemes.
Second, raise the personal allowance — the amount anyone can earn tax-free — from £12,570 to roughly £16,000 annually. This reduces the tax take from lower and middle earners by £10.5 billion annually. The rationale is equally straightforward: most of the benefit accrues to people earning between £20,000 and £45,000 annually, the threshold at which tax obligations begin. For individuals in this range, a higher personal allowance increases take-home pay, allowing greater discretionary spending and savings. This cohort has the highest marginal propensity to consume — they spend additional income rather than saving it. This stimulates demand.
| Tax measure | Affected cohort | Annual cost |
|---|---|---|
| Higher rate threshold increase | Top 5-10% | £1.5bn |
| Personal allowance increase | Lower/middle earners | £10.5bn |
| Total cost | — | £12bn |
The timing of implementation matters. The CRPF proposes phasing in these tax cuts immediately, not waiting for welfare reforms to take full effect. This creates immediate stimulus to consumption and investment. Households have more disposable income; businesses have greater retained earnings for reinvestment. This demand-side stimulus begins to generate growth within months rather than years. As growth materializes, tax receipts expand. Simultaneously, welfare reforms begin to take effect, reducing spending growth. The combination of stimulus and spending control prevents the fiscal situation from deteriorating.
Fully funded tax cuts and a refocus on wealth creation, not redistribution.
Martin Beck, Mortgaged to the Hilt
Why this is not purely distributional
Critics will note that these tax cuts benefit the already-employed and those with wealth to invest, rather than those unable to work or facing genuine hardship. This is true but incomplete. The tax cuts are not purely distributional policy; they are growth policy. The goal is not to shift resources from poor to rich but to expand the total resources available through accelerated growth. If growth accelerates from 1-2 per cent annually to 3-4 per cent, the additional economic output can be directed toward greater support for vulnerable populations, not less.
Moreover, the phasing is deliberate. By raising the personal allowance for lower earners, the tax cuts front-load benefits toward those most likely to spend additional income immediately. Lower earners have higher marginal propensity to consume — they spend additional income rather than saving it. This generates immediate aggregate demand stimulus. Reducing the higher rate threshold provides longer-term incentive effects for entrepreneurship and investment. The combination addresses both immediate demand constraints and longer-term supply-side growth challenges.
The political economy of this approach is also worth noting. Tax cuts are popular; welfare reforms are unpopular. By pairing them, the government creates a political path toward welfare reform that is otherwise blocked. Voters dislike benefit restrictions in the abstract but accept them when coupled with broader prosperity. The tax cuts provide a counterbalance: yes, some means-tested benefits are restricted, but workers retain more of what they earn. This is a more politically sustainable reform than either policy alone.
Implementation and risk management
The proposal is calibrated to ensure that fiscal discipline is maintained throughout. The welfare reforms that fund the tax cuts are not hypothetical; they are specific policy changes with identified savings. These savings must be locked in before tax cuts are implemented. If welfare reforms fail or are watered down, the tax cuts do not proceed — the fiscal space does not exist to accommodate them.
Furthermore, the tax cuts are constructed to generate behaviour change that reinforces the fiscal case. By increasing the incentive to work and invest, the cuts should generate offsetting revenue through increased economic activity and tax compliance. The CRPF’s analysis suggests that the full dynamic — direct cost of the cuts, minus behavioural offset from increased work and investment, minus growth effects on the broader tax base — leaves a net cost of roughly £8-10 billion rather than the full £12 billion cost. The welfare reforms exceed this net cost, keeping the package fiscally neutral.
There is risk in this assumption. If behaviour change does not materialize as expected, the full cost of the tax cuts falls on the public finances. However, economic evidence is consistent: lower marginal tax rates do increase work supply and investment, particularly among high earners and among individuals trapped in poverty-wage employment by welfare withdrawal. The estimates are conservative, not speculative.
The alternative scenario
Consider the alternative to funded tax cuts. Absent tax changes, current policy implies both continued high taxation and continued high spending on welfare. This generates two problems simultaneously: insufficient growth (because high taxes depress work and investment incentives) and insufficient fiscal space (because spending growth outpaces revenue). The only solution becomes ever-larger borrowing or emergency spending cuts. Neither is sustainable.
By contrast, funded tax cuts create a virtuous cycle. Lower taxes stimulate growth. Growth expands tax revenues, even at lower rates. Welfare reforms reduce spending growth while maintaining support for vulnerable populations. Growth and spending discipline combine to stabilize public finances. Most importantly, growth is the only sustainable path to fiscal stability; endless tax increases and spending cuts will never work.
A healthy economy solves fiscal problems. A sick economy cannot be taxed or cut into health.
Martin Beck, Mortgaged to the Hilt
This is not a right-wing fantasy of supply-side revolution. It is pragmatic economics based on evidence that lower marginal tax rates, combined with disciplined spending control and focused welfare support, generate the conditions for sustainable growth. Britain faces a choice: pursue endless tax-and-spend cycles, or build a growth-oriented economy where rising prosperity reduces fiscal pressure naturally. Funded tax cuts are a tool for making that choice real.