Cap in Hand – Takeaways

The numbers

From April 2029, salary-sacrificed pension contributions above £2,000 a year lose their National Insurance exemption. This note tests the official numbers and puts a face on who pays. The £4.7bn is broadly consistent with this note’s own imputation; on the OBR’s own reckoning it is flattered by timing, the burden is narrow, and the genuine gamble is with retirement saving, not receipts.

Six facts

• The headline number holds up; the fall is the OBR’s own. An imputation from the IFS’s decile data comes within a tenth of the OBR’s £4.7bn first-year costing. The fall to a durable £2.6bn a year is the OBR’s own decomposition: much of the first year is a one-off timing effect as workers switch contribution arrangements.
• 70% of above-cap sacrificed contributions sit with the top tenth of earners (authors’ calculations from the IFS’s decile analysis). The bottom half of the earnings distribution holds about 2% of the above-cap saving; exempting it would move the yield by about that much. Inside actual firms the pattern is the same: 96% of scheme users earning over £50,000 would be caught, against 4% of those under £30,000.
• The small-firm decomposition is new. Roughly 740,000 affected savers work at private-sector firms with fewer than fifty staff (280,000 to 1.5 million across usage assumptions), supplying around a sixth of the static yield: a minority of the money, but the segment least able to open the rebalancing door. Method in the full paper.
• The revenue survives most responses. An above-cap pound has four ways out, which the full paper calls doors: kept in the pension (now paying NI at an average 17.3%), taken as pay, captured by the employer, or rebalanced into ordinary NIC-free employer contributions. Followed to its destination, the pound is taxed behind every door but the last: pay meets income tax and NI; employer margin is taxed as profit. Only rebalancing, which the OBR nets off at £0.7bn in its 2030–31 costing, leaves the Treasury with nothing from the cap; on the option-priced sensitivity (Appendix B of the full paper), employer capture nets little or nothing too.
• The Treasury is a silent partner in every pension pot: income tax due on the way out gives it a claim worth at least £15 of every £100 saved, and more where retirement income reaches the higher band. The cap collects £17.30 now; wherever it kills the saving instead of re-routing it, that claim dies too. The official scorecard cannot see the trade: fiscal rules run on a five-year forecast, and a five-year ruler laid against a thirty-year asset reads zero. Scored, the cap trades tomorrow’s revenue for today’s. (The NI itself is separate and permanent: pension income never pays NI in any world.)
• The verdict: a modest gamble with revenue and a larger one with retirement saving. The four responses differ mainly in whether saving survives, and no national dataset can see which one savers take.

Follow the pound

Exhibit: authors’ calculations, per £100 of above-cap saving, net of the Treasury’s claim on the pot at market value (£15 per £100). Derivations in the full paper.

Valued at the £15 floor, only one door yields the Treasury nothing; at the option-priced £20–25, employer capture nets little or nothing. What the doors really differ on is saving: it survives where the pound stays in a pension (kept, or rebalanced into ordinary contributions) and dies where the pound becomes pay or employer margin. That reframing moves the argument from receipts, where the data mostly reassure, to retirement saving, where they do not.

Why this dataset

The analysis rests on person-level records of 10,538 workers at 965 small firms on the Husky workplace pensions and savings platform: each worker’s pay, contributions, sacrifice and demographics linked to their employer. Four things in this note come from those records; no national source provides them. The parameters: the 17.3% average NI charge and the sacrifice amounts behind the doors arithmetic are measured from real contributions, not assumed. The inside view: national statistics show where the burden sits across the earnings distribution; these records show how it lands inside actual firms, on whose payroll and on whom. The small-firm ledger: reweighted to national firm demography, the records yield an estimate of the cap’s incidence in small-firm Britain that no national source offers. And the people: the affected saver is 41, earns £75,000 and sacrifices 5% of pay; the typical below-cap user is 34, earns £34,300 and is more often a woman; one affected saver in five is 50 or older, with the fewest years left to adjust.

This takeaway accompanies the full analysis: ‘Cap in hand: who bears the £2,000 cap on salary-sacrificed pensions’, Husky Finance, August 2026 (draft). All figures are sourced there; person-level results come from Husky platform records of 10,538 workers at 965 small firms (159 of them in the salary-exchange analysis), February 2025. No personal data appears in either document.