The rule, the working, the citation.
Short technical explainers on the parts of pension and bond tax that are most often computed wrongly — each grounded in the HMRC manuals and the cases our engine tests against.
- Investment bonds · Top-slicing relief · 9 min read
How IPTM3820 / HMRC Agent Update 83 (2021) changed top-slicing — and which tools haven't caught up
The post-2021/22 PSA recalc, worked end to end on the offshore case our engine regression-tests against. £9,446 the old way; £10,046 the right way.
Read → - Pensions · Annual allowance · 10 min read
Carry-forward of unused annual allowance: the three-year window, the taper, and the corner cases
Three years of unused allowance, used oldest-first, after the current year is spent. The taper and the MPAA are where it goes wrong.
Read → - Pensions · Defined benefit · 10 min read
DB pension input amounts and the CPI revaluation step everyone gets wrong
The opening value is uprated by September CPI before it is subtracted. Miss it and you manufacture an AA charge that is not due.
Read → - Pensions · Annual allowance · 5 min read
The tapered annual allowance, explained
The two-gate taper worked end to end: threshold income opens the gate, adjusted income sets the reduction. £45,000 of allowance on a £290,000 earner.
Read → - Pensions · Annual allowance · 4 min read
The money purchase annual allowance (MPAA)
What triggers the MPAA, why carry-forward cannot rescue the DC excess (though it survives for the DB side), and a £5,000 charge worked from a £15,000 contribution after the trigger.
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