The delivery chapters in this series all describe things Britain could do. Food, Energy, Health & Care, Housing, Defence, Social Security: each comes with a price tag. This chapter adds them up and asks the question every reader has been waiting for since chapter two.
Can we afford it?
The honest answer is: not from current tax and spending without change. But affordability is not the same as impossibility. Britain borrows in its own currency. It has borrowed for worse reasons than rebuilding food security and housing. The constraint is not whether pounds exist. The constraint is whether the government can borrow credibly, raise revenue progressively, and spend in a way that markets and voters will tolerate.
This is the load-bearing wall of the series. Everything after it depends on this arithmetic being credible.
What the programme costs
Add the delivery commitments together and you get a number that sounds frightening until you compare it to what inaction costs.
Food security runs roughly GBP 2.5-3.5 billion per year. Energy security runs GBP 5-8 billion. Health and social care, fully funded, runs GBP 5-8 billion. Housing at scale runs GBP 25 billion, mostly capital for homes that reduce future housing benefit liabilities. Social security reform runs GBP 20-25 billion. Defence at credible NATO levels adds GBP 10-15 billion if fully met.
The total annual programme sits somewhere between GBP 58 and 86 billion depending on which elements are activated and how fast housing scales. That is not a typo. It is the honest aggregate of what the preceding chapters propose.
Compare it to context. UK GDP is roughly GBP 2.8 trillion. The programme at central estimate is about 2-3% of GDP per year. The energy price cap support package in 2022 cost GBP 40 billion in a single year. Debt interest alone now runs near GBP 100 billion annually. The question is not whether the number is large. It is whether it is larger than the cost of managed decline.
What revenue can raise
The programme does not pretend tax rises are optional. It proposes a package designed to fall mainly on those with the greatest capacity to pay.
Windfall levy on energy companies. Hardened upstream profit levy: roughly GBP 3-5 billion per year.
Corporate profit surcharge. A 3% surcharge on UK profits above GBP 50 million, structured as a qualifying domestic top-up tax under OECD Pillar Two rules so it survives legal challenge. Yield: GBP 4-8 billion if structured correctly, lower if not.
HMRC enforcement expansion. Offshore wealth, corporate compliance, and high-net-worth units combined: GBP 2-5 billion per year at programme scale. This depends on the staffing investment in the Civil Service chapter. Without HMRC capacity, the revenue line is fiction.
Inheritance tax and property reform. Better enforcement and top-band council tax reform on high-value property: GBP 3-6 billion combined.
Carbon pricing with household dividend. Progressive revenue tool that returns a share of proceeds to households: net yield depends on design, counted in the central package.
Fully implemented, the revenue options yield roughly GBP 20-35 billion per year. That is real money. It is not enough to cover the full programme from revenue alone.
The gap and what fills it
The gap between revenue and full programme cost is roughly GBP 23-51 billion per year depending on assumptions. That gap is closed by borrowing, and by being precise about what the borrowing buys.
Infrastructure borrowing for housing and energy is not the same as borrowing to fund tax cuts. Assets are created: homes, grid capacity, strategic reserves. Those assets generate returns through reduced benefit bills, economic activity, and avoided crisis spending. The housing programme's GBP 25 billion is capital, not consumption. The fiscal framework treats it that way.
Current spending on NHS workforce, social care, and social security is harder. It does not appear on the balance sheet as an asset. It appears as better health outcomes, fewer emergency admissions, and a political coalition that can sustain a decade of reform. The return is real but diffuse. Markets care less about diffuse returns, which is why the revenue side must be credible enough to carry the current spending while capital borrowing carries the infrastructure.
Health and housing both claim to be first charges on borrowing. They are not in competition if framed honestly: housing uses infrastructure borrowing headroom; health uses revenue expansion headroom. The deep dive works through the collision in detail. The everyday version is: capital for homes, revenue for care, sequenced so neither pretends to be the only priority.
The Truss question
Every serious fiscal programme in Britain since September 2022 lives in the shadow of the mini-budget.
Truss failed because the market concluded the UK was borrowing for consumption without a credible growth or revenue plan. Gilt yields spiked. Sterling fell. Imported inflation followed. The Bank of England raised rates. The programme died by the mechanism it ignored.
This programme is structurally different. It raises revenue progressively. It borrows primarily for infrastructure with identifiable assets. It names a fiscal adjustment trigger before the crisis rather than improvising after it. None of that makes it immune to gilt market pressure. It makes the case answerable.
If the Office for Budget Responsibility scores revenue more than GBP 10 billion below central estimates, or if UK-specific gilt yields rise more than 100 basis points, automatic adjustments activate in order: accelerate highest-yield revenue measures, defer non-urgent capital by up to eighteen months, protect social security from cuts. The trigger is not discretionary. The OBR certifies it annually. Markets are being told what happens if their fears materialise, not being asked to trust optimism.
The Bank of England is not a backstop. A joint Treasury-BoE protocol commits both institutions to no monetisation of government debt. Gilt credibility rests on fiscal substance, not on the central bank buying bonds to rescue a weak plan.
Who pays and who benefits
A fiscal framework that funds progressive spending with regressive revenue collapses politically in year two. This package is designed the other way.
Inheritance reform targets concentrated wealth, not family farms in genuine difficulty. Council tax reform hits GBP 5 million London flats, not GBP 200,000 semis in the Midlands. Corporate surcharge falls on firms with pricing power, not on SMEs at the margin. Offshore enforcement targets structures the wealthy use to avoid contributing.
The households that benefit most from food security, energy support, housing, and health spending are the same households that pay the bulk of existing taxes. They need to see a reciprocal deal: we fund this together, progressively, and we receive material improvement in return. Without that, the arithmetic is correct and the politics fails.
What inaction costs
Reactive austerity is the alternative to a coherent framework. It is also the fiscal expression of managed decline: naming structural problems, then cutting the institutions needed to fix them.
Deferred housing investment means the housing benefit bill keeps growing. Deferred energy investment means fuel poverty compounds and industry leaves. Deferred health spending means emergency costs absorb the savings. Deferred food security means a price shock becomes a nutrition crisis that lands on the NHS two years later.
Those costs do not appear on the debt statistics. They appear in waiting lists, food banks, and a state that cannot respond to the next shock. The argument for this framework is not that it is cheap. It is that the alternative is more expensive on a timetable that destroys the political capacity to act.
The Next Piece
Fiscal arithmetic is necessary but not sufficient. A government can have the right numbers and still fail if crises are coordinated through committees designed for calm Tuesdays in Whitehall. Governance covers the decision architecture. Civil Service covers whether anyone is available to execute. How It Gets Done names the delivery bodies and parliamentary timelines.
Optional depth: Fiscal Framework: Deep Dive.
Read next: Governance.