There is a particular kind of planning conversation that starts with a tax rule and ends with a structure nobody can explain in a sentence. The saving is real. The complexity is also real. What gets lost is the comparison between the two.
This article sets out a test for that comparison. It uses two familiar cases — the personal allowance taper that produces the so-called 60% trap, and the tapered annual allowance for high earners — not as things to chase, but as worked illustrations of how the test behaves differently depending on what kind of problem you actually have.
The audience is professionals and couples in the decade or so before stopping work, with meaningful money spread across pensions, ISAs and property. At that stage, the question is rarely ‘can I save tax?’ It is ‘which tax savings are worth the effort, the risk of error, and the loss of flexibility?’
The test, stated plainly
A tax saving is a line item in a cost-benefit calculation, not the objective. Before adding complexity, put four questions to the proposal.
- What is the actual after-tax saving, in pounds? Not the headline percentage. The pounds that end up with you or your family after all the effects have washed through.
- What does it cost to achieve? Advice, administration, filings, product charges, and the recurring time to keep it correct. One-off and annual costs both count.
- What does it cost in flexibility? Money inside a pension is not the same as money in an ISA. A saving that locks up capital you may need before a known date is not free.
- What is the error risk? If an input is wrong, or a rule changes, what happens? Some savings are robust to small errors. Others collapse.
If the after-tax saving is small relative to the cost and the error risk, simplify. If the saving is large and the inputs are verifiable, proceed — but write the assumptions down before you act.
Case one: the personal allowance taper
The standard Personal Allowance is £12,570 (2026 to 2027). It is reduced by £1 for every £2 of adjusted net income above £100,000, reaching zero at £125,140. The higher rate of Income Tax runs from £50,271 to £125,140, with the additional rate above that. Sources: GOV.UK, Income Tax rates and Personal Allowances and HMRC, Income Tax rates and allowances.
Inside that £100,000 to £125,140 band, each additional £2 of income costs £1 of allowance. The £1 of lost allowance is taxed at 40%, and the £2 of income is itself taxed at 40%. The combined effect is an effective marginal rate of 60% on income in that band. That is a marginal-rate statement, not a flat rate on all income. It applies to the slice of income within the band, not to the whole of someone’s earnings.
Now apply the test. A pension contribution can reduce adjusted net income and restore some or all of the allowance. The saving is the difference between the tax actually paid and the tax that would be paid without the contribution. That number can be calculated. It is not a matter of opinion.
But the contribution has to be affordable, and the relief has to be genuinely captured. A contribution that restores allowance but leaves you short of cash before a known expenditure is a saving purchased with liquidity. A contribution made late in the tax year, after the income has already been received, may not have the effect you expect if the numbers are not checked first.
The 60% trap is, in the main, a timing and amount problem. It rewards accurate arithmetic and a clear view of the current tax year. It does not usually require a permanent structure.
Case two: the tapered annual allowance
The annual allowance is £60,000 in the current tax year. A reduced, or tapered, allowance applies where both threshold income is over £200,000 and adjusted income is over £260,000. For every £2 that adjusted income exceeds £260,000, the annual allowance reduces by £1, down to a minimum of £10,000. If threshold income is £200,000 or less, the allowance is not reduced, whatever the adjusted income. Sources: GOV.UK, Tax on your private pension contributions: annual allowance and HMRC, Work out your reduced (tapered) annual allowance.
The mechanics are simple to state and awkward to apply. Adjusted income includes employer pension contributions. Threshold income adds back salary sacrifice or flexible remuneration arrangements made on or after 9 July 2015. The taper rules came into force on 6 April 2016 and changed from 6 April 2023. Source: Aegon technical guide, tapered annual allowance.
Apply the test. The saving only matters if contributions would otherwise exceed the reduced allowance. If they would not, the taper is an interesting fact and nothing more. If they would, the size of the saving depends on numbers that are not all on the payslip: employer contributions, salary sacrifice add-backs, and the interaction with carry-forward from the previous three tax years.
That measurement burden is itself a cost. It is recurring, because adjusted income has to be worked out each year. It is error-prone, because the inputs sit across payroll, scheme statements and tax returns. And it is exposed to rule changes, which have been frequent.
The taper is, in the main, an income-measurement problem. It rewards clean data and a documented method. It punishes guesswork.
Why the same test gives different answers
The two cases look similar from a distance. Both involve pension contributions and marginal rates. Up close, they are different kinds of complexity.
The 60% trap is a marginal-rate problem. It can often be addressed by timing and amount within a single tax year. The inputs are largely within your control, and the calculation is short.
The taper is an income-measurement problem. It requires accurate data on employer contributions and salary sacrifice, and it recurs annually. The inputs are partly outside your control, and the calculation is longer.
Under the same four questions, the first case often passes and the second often needs a higher hurdle. Not because the taper is unfair, but because the cost of getting it right is higher and the cost of getting it wrong is less visible.
A discipline for the assumptions
Before acting on either case, write down the inputs you are relying on: the marginal rate, the contribution amount, the employer contribution, the salary sacrifice add-back, and the expected holding period. If an input cannot be verified, discount the saving for uncertainty.
This is not bureaucracy. It is the difference between a decision you can review next year and a decision you can only defend.
Where the fiduciary question sits
The test also has a governance purpose. Complexity that serves the client’s after-tax outcome is one thing. Complexity that serves the adviser’s or the product provider’s revenue is another. The FCA Consumer Duty requires firms to put their customers’ needs first, and the Financial Services Register lists firms and individuals involved with regulated activities that the FCA has currently or previously approved. Sources: FCA, Consumer Duty and FCA, Financial Services Register.
Those are general standards, not findings about any particular firm. But they support a simple question to ask of any proposal: does this complexity serve my after-tax outcome, or does it serve the revenue of the person recommending it? If the answer is not clear, the test has not been passed.
For readers thinking about the wider adviser relationship, the questions in The Question You Should Be Asking Years Before You Retire sit alongside this test rather than replacing it.
FAQ
Is the 60% rate a flat rate on all my income between £100,000 and £125,140?
No. It is an effective marginal rate on the slice of income within the band, created by the interaction of the 40% higher rate and the £1-for-£2 reduction in the Personal Allowance. The rate on the whole of your income is lower.
Does the tapered annual allowance apply to me if my salary is below £200,000?
Threshold income is not the same as salary. It is calculated from net income with certain adjustments, including the deduction of gross relief-at-source pension contributions and the add-back of salary sacrifice arrangements made on or after 9 July 2015. If threshold income is £200,000 or less, the allowance is not reduced, whatever the adjusted income.
What is the minimum tapered annual allowance?
£10,000 in the current tax year. The reduction is £1 for every £2 of adjusted income above £260,000, subject to that floor.
Can I carry forward unused annual allowance?
Yes, unused allowance from the previous three tax years may be available. The available annual allowance is the reduced allowance plus any unused allowance from those years. Source: HMRC, Work out your reduced (tapered) annual allowance.
Do I need to tell HMRC if I exceed the annual allowance?
Yes. You fill in the pension savings tax charges section of a Self Assessment tax return, even if your pension provider pays all or part of the charge. Source: GOV.UK, annual allowance.
Is the standard lifetime allowance still relevant?
The standard lifetime allowance was abolished from 6 April 2024. The standard individual lump sum allowance is £268,275 for 2024 to 2025 through 2026 to 2027. Source: HMRC, Pension schemes rates.