The IFS costed Reform UK's Scottish income tax cuts at £2-3.7bn per year with no credible evidence they would self-fund. The Fraser of Allander Institute separately confirmed the plan is unaffordable.Source: Institute for Fiscal Studies

What did the IFS say about Scottish party manifestos in 2026?

The IFS found all four major Scottish parties lack credible fiscal plans: Scottish Labour overspends by £4.4bn, the SNP overstates consequentials by £1.6bn, Scottish Conservatives underestimate their NHS pledge, and Reform UK's tax cut has no self-funding evidence. The first such blanket dismissal in 27 years of devolution.Source: Institute for Fiscal Studies

How does the IFS assess party manifesto costings?

The IFS independently reviews party spending promises against available fiscal headroom, examining whether pledges are fully costed, rely on credible assumptions, and ADD up within the stated spending envelope.Source: Institute for Fiscal Studies

Background

The Institute for Fiscal Studies (IFS) is an independent UK economic research institute founded in 1969, widely regarded as the authoritative fiscal arbiter during British election campaigns. Its manifesto unit has assessed every major UK party's spending plans since 2010, and its verdicts routinely shape broadcast coverage and opposition attack lines.

In April 2026 the IFS completed a six-of-six rejection of every Holyrood party's fiscal plans — the first such blanket dismissal in 27 years of devolution. The SNP's manifesto, assessed on 21 April, was found to ADD £1.4bn per year by 2031-32 without credible funding, completing the sweep after earlier verdicts against all other parties. Earlier findings: Scottish Labour's proposals exceed unallocated funding by £4.4bn; the Scottish Conservatives' NHS pledge is underestimated by at least £600m; and Reform UK's income tax cut would cost £2-3.7bn per year with no self-funding evidence. The Fraser of Allander Institute separately corroborated the Reform finding. The SNP's earlier IFS assessment found its NHS Barnett consequentials overstated by £1.6bn.

The IFS does not endorse parties or policies; it publishes analysis financed by charitable and research-council funding. Its unusual willingness to dismiss all four parties simultaneously signals how FAR Scotland's 2026 manifestos departed from fiscal realism — and how much the institute's independence amplifies that verdict when parties cannot credibly accuse it of partisan bias. The IFS is also a reference point on UK-wide fiscal policy, where it has been critical of government spending decisions across multiple administrations.