# Manifesto costings: what 'fully funded' actually means

> Election costings documents are exercises in framing as much as arithmetic, and a short list of standard tricks covers most of what the grey boxes conceal.

*Section: Politics — By Sarah Mitchell — Published July 12, 2026 — 2 min read*

Canonical URL: https://dailyjunction.co.uk/politics/manifesto-costings-what-fully-funded-actually-means
Tags: manifestos, public spending, elections, fiscal policy, IFS, politics

## Key takeaways

- Parties cost their pledges against revenue-raisers whose yields are themselves estimates, often optimistic ones such as avoidance clampdowns.
- The largest fiscal choices usually sit outside the costed pledges, in baseline assumptions about departmental spending after the election.
- Independent bodies such as the IFS assess manifestos, and their standard critique is not bad arithmetic but silence about the big numbers.

Every election produces the same scene: a party launches its manifesto alongside a costings document, columns of pledges matched to revenue-raisers, and declares the programme fully funded. Rival parties produce dossiers alleging black holes. Both documents are arithmetic wearing the costume of accounting, and reading them requires knowing the standard moves.

The first move is the optimistic revenue-raiser. Clamping down on tax avoidance appears in nearly every manifesto of every party, yielding whatever sum the pledges happen to need, precisely because the yield is unauditable in advance. Taxes on narrow, unpopular bases, non-doms, banks, tech firms, private schools, carry estimates highly sensitive to how the taxed respond, and the documents reliably pick the sensitivity that flatters. Independent analysts do not accuse the parties of fabrication so much as of always rounding in their own favour.

The second move is timing. Pledges are costed for a single year, often the final year of the parliament when a phased policy is cheapest, or revenues are banked immediately while the spending they fund arrives later. A pledge "worth two billion by the end of the parliament" may cost a fraction of that in any year a voter will actually live through, and vice versa.

The third and largest move is silence. The genuinely enormous fiscal decisions rarely appear as pledges at all; they sit in the baseline. A manifesto inherits published spending plans that may imply years of unstated cuts to unprotected departments, courts, councils, prisons, and by simply not mentioning them, a party adopts them without announcing anything. The Institute for Fiscal Studies' recurring election-time complaint is exactly this: not that the sums fail to add up, but that the documents are precise about small things and silent about big ones, a conspiracy of silence in which all major parties participate.

## Reading them anyway

None of this makes costings worthless. The discipline of publishing numbers constrains fantasy, invites scrutiny, and gives independent bodies a text to audit; countries without the ritual manage less honesty, not more. The Netherlands goes further, with an official bureau costing every party's programme on identical assumptions, an idea periodically proposed for the UK, where the official forecaster is currently barred from assessing opposition policies.

A citizen's toolkit fits in four questions. What does the baseline assume about spending after the election? Which revenue lines are estimates of behaviour rather than arithmetic? What happens in the years between now and the single year the document costs? And what known pressure, social care being the perennial example, does the document decline to mention at all? The grey boxes answer the small questions. The gaps are where the next parliament actually lives.

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Daily Junction — https://dailyjunction.co.uk/politics/manifesto-costings-what-fully-funded-actually-means