Threshold Income vs Adjusted Income: Two Figures, Not One
The tapered annual allowance is widely misunderstood, and almost always for the same reason: it depends on two definitions of income that sound like synonyms and behave like opposites. Threshold income takes your income and subtracts your own pension contributions. Adjusted income takes your income and adds what your employer puts in. One goes down as you pay in more; the other goes up. And the taper only reduces your allowance when both are over their own separate limit — pass one test and not the other, and the full allowance still applies.
The pension allowance calculator asks for your own and your employer’s contributions separately, and shows both figures with the taper worked out.Why One Income Box Cannot Get This Right
A calculator that asks for a single income figure has to guess which definition you meant, and it will be wrong in one of two directions. Someone on a moderate salary whose employer contributes heavily has a high adjusted income and a modest threshold income; a tool using one figure will taper them when it should not. Someone paying a large amount in themselves has the reverse profile, and the same tool will over-taper. Neither error is visible in the result — you get a plausible allowance figure either way — which is why the two-box form is not a matter of thoroughness but of whether the answer can be right at all.
The Both Test, and Who It Protects
The requirement that both tests are passed is not a technicality; it exists to protect people whose employer, not they themselves, is responsible for the large contribution. Public sector and defined benefit schemes make this common: the amount treated as going in can be substantial while the member’s salary is nowhere near the taper territory. Their adjusted income clears the limit and their threshold income does not, so the allowance stays whole. A tool that ignores the threshold test takes that protection away silently.
Your Own Contributions Can Switch the Taper Off
Because threshold income is measured after deducting your own contributions, paying more in can move you back under the first limit and stop the taper entirely. That is an unusual shape in tax: an action that reduces your allowance problem rather than consuming your allowance. It is also why the order of the checks matters when planning — the contribution changes the input to the test that decides how much you were allowed to contribute. Whether it is the right move for you depends on circumstances a calculator cannot see, but the mechanism is worth understanding before a conversation with an adviser rather than after.
Two Numbers That Are Equal This Year and Mean Different Things
One more trap sits nearby. The floor that the taper cannot reduce your allowance below, and the separate limit that applies once you have flexibly accessed a pension, currently happen to be the same amount. They are not the same thing: one is triggered by high income, the other by having taken taxable money out of a pot, and only one of them blocks the use of unused allowance carried forward from earlier years. Because they are equal this year, a tool that conflates them looks correct — right up until the year they diverge.