You have read nine chapters describing things Britain could do. Each came with a direction and a human stake. This chapter answers the question waiting since chapter two.
Can we afford it?
The honest answer: not from current tax and spending without change. Affordability is not the same as impossibility. Britain borrows in its own currency. The constraint is whether government can borrow credibly, raise revenue progressively, and spend in ways markets and voters will tolerate.
This is the load-bearing wall of the series.
The scale
Add the delivery commitments together and you reach roughly GBP 72-91 billion[1] per year at central estimate, depending on how fast housing scales. Against UK GDP of roughly GBP 2.8 trillion[4], that is about 2.6-3.3%[2]. Large, but compare it to the GBP 40 billion energy cap package in a single year in 2022[5], about 1.4%[3] of GDP in that same year, or GBP 100 billion in debt interest already on the books[6].
Industrial strategy capital sits outside that annual total because it is project-by-project investment over years, not a standing benefit line.
The question is not whether the number is big. It is whether doing nothing is cheaper. Managed decline has its own invoice: rising housing benefit, emergency NHS spending, crisis packages, and a state that cannot respond to the next shock without another improvisation.
How you pay for it
This programme does not pretend tax rises are optional. Revenue should fall mainly on those with the greatest capacity to pay: hardened windfall levies on energy profits, a corporate surcharge on very large UK profits, stronger HMRC enforcement against offshore wealth, inheritance and high-value property reform, and carbon pricing with a household dividend.
Fully implemented, honest revenue yields roughly GBP 20-35 billion[7] per year. Real money. Not enough alone.
The gap is closed by borrowing, and by being clear what borrowing buys. Homes, grid capacity, and reserves are assets. Borrowing for them is not the same as borrowing for unfunded tax cuts. NHS workforce, social care, and social security are current spending with diffuse but real returns. Markets care less about diffuse returns, which is why the revenue side must be credible.
Housing uses infrastructure borrowing headroom; health uses revenue expansion. Sequenced honestly, they are not in competition.
The Truss question
Every serious fiscal plan since September 2022 lives in Truss's shadow. That mini-budget failed because markets concluded Britain was borrowing for consumption without credible revenue or growth.
This programme is structurally different: progressive revenue, infrastructure borrowing with identifiable assets, and pre-committed adjustment triggers if forecasts miss or gilt yields spike. Protect social security from cuts; defer non-urgent capital; accelerate highest-yield revenue. Markets are told what happens if their fears materialise.
The Bank of England is not a backstop for weak plans. Gilt credibility rests on fiscal substance.
Who pays and who benefits
A framework that funds progressive spending with regressive revenue collapses politically in year two. Inheritance reform targets concentrated wealth. Council tax reform hits high-value property, not ordinary semis. Corporate surcharge falls on firms with pricing power.
Households that benefit most from food, energy, housing, and health spending need to see a reciprocal deal: we fund this together, progressively, and life materially improves.
Full programme tables, revenue yield assumptions, line-by-line inaction costs, and stress tests are in the Fiscal Framework: Deep Dive.
The Next Piece
Arithmetic is necessary but not sufficient. Crises still get routed through committees designed for calm Tuesdays. Governance covers decision architecture; Civil Service covers whether anyone is available to execute.
Read next: Governance.