NHS Pension

Pension Input Amount (PIA) Explained: Worked Examples

FP FrontlinePay Editorial

Updated September 2026

Independent guidance — not affiliated with NHS England or DHSC

Our main Annual Allowance Tax Charge Explained guide covers the Pension Input Amount at a summary level — the ×16 multiplier, and why it catches NHS staff off guard. This page goes further: three fully worked numeric examples, using the 2015 CARE Scheme's real 1/54th accrual rate and this site's own stated revaluation assumptions, showing exactly how a Pension Input Amount is actually calculated from opening and closing pension figures.

Short answer

Your Pension Input Amount is: (closing annual pension − opening annual pension revalued for CPI) × 16. The closing figure reflects a full year of 2015 Scheme CARE mechanics — your existing pot revalued at CPI+1.5%, plus a fresh 1/54th slice of that year's pensionable pay. Because the scheme's own in-service revaluation rate (CPI+1.5%) is higher than the CPI-only rate used to revalue the opening figure for the Annual Allowance test, even a flat-pay year produces a small positive Pension Input Amount. A genuine promotion adds more, but — as the worked examples below show — rarely enough on its own to threaten the standard £60,000 allowance. What can breach it is a large, one-off pensionable payment landing in a single scheme year.

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The formula, step by step

Step	What it is
1. New accrual	This year's pensionable pay × 1/54 (1.85%)
2. Closing pension	Opening pension × (1 + CPI+1.5%, modelled at 2.5%) + new accrual
3. Revalued opening (for the AA test)	Opening pension × (1 + 2% CPI)
4. Growth	Closing pension − revalued opening pension
5. Pension Input Amount	Growth × 16

Scenario 1: steady pay, no promotion

A Band 6 nurse on £42,000 of pensionable pay, unchanged from the previous year, with £9,000 of annual pension already accrued from earlier service.

Step	Calculation	Result
New accrual	£42,000 × 1/54	£778
Closing pension	£9,000 × 1.025 + £778	£10,003
Revalued opening	£9,000 × 1.02	£9,180
Growth	£10,003 − £9,180	£823
Pension Input Amount	£823 × 16	£13,164

Even with a completely flat salary, her Pension Input Amount is £13,164 — comfortably under the £60,000 standard allowance, but not zero, purely because of the gap between the scheme's CPI+1.5% in-service revaluation and the CPI-only rate used for the Annual Allowance test itself.

Scenario 2: a genuine promotion

A Band 7 clinician promoted to Band 8a, with pensionable pay rising to £58,000 for the year, and £14,000 of annual pension already accrued.

Step Calculation Result

New accrual £58,000 × 1/54 £1,074

Closing pension £14,000 × 1.025 + £1,074 £15,424

Revalued opening £14,000 × 1.02 £14,280

Growth £15,424 − £14,280 £1,144

Pension Input Amount £1,144 × 16 £18,305

A real, meaningful promotion still only produces a Pension Input Amount of £18,305 — well under the standard allowance. This is worth sitting with: the ×16 multiplier gets a lot of attention, but the 1/54th accrual rate on the other side of the equation means an ordinary promotion, even a good one, is genuinely unlikely to threaten most people's Annual Allowance on its own. To test your own promotion, enter your opening and closing pension figures into our annual allowance calculator.

Scenario 3: a large one-off pensionable payment

A senior clinician with £30,000 of annual pension already accrued from long service receives a substantial backdated pay award — several years of banding-appeal or Clinical Excellence Award arrears, all paid and treated as pensionable in a single tax year — taking total pensionable pay for the year to £270,000.

Step Calculation Result

New accrual £270,000 × 1/54 £5,000

Closing pension £30,000 × 1.025 + £5,000 £35,750

Revalued opening £30,000 × 1.02 £30,600

Growth £35,750 − £30,600 £5,150

Pension Input Amount £5,150 × 16 £82,400

Excess over the standard allowance

£22,400

£82,400 Pension Input Amount − £60,000 standard allowance, before any carry-forward is applied.

⚠This kind of year very likely also affects tapering

A one-off payment large enough to push pensionable pay to £270,000 in a single year would, in reality, very likely also push this member's threshold and adjusted income up for the same year — potentially triggering the tapered Annual Allowance on top of the pure CARE growth shown here. This scenario deliberately isolates the CARE accrual mechanism alone; see our Tapered Annual Allowance: Worked Examples guide for how a high-income year like this would additionally reduce the allowance itself, not just increase the Pension Input Amount tested against it.

Check your own Pension Input Amount
Use our Annual Allowance Calculator to run your own opening and closing pension figures through this exact calculation.
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What the three scenarios show together

✓ Scenario 1 shows your Pension Input Amount is never exactly zero, even with flat pay — the CPI+1.5% vs CPI-only revaluation gap alone produced £13,164
✓ Scenario 2 shows a genuine promotion (opening pension £14,000, pay rising to £58,000) still only produced £18,305 — well under the £60,000 allowance
✓ Scenario 3 shows what actually breaches the standard allowance under pure CARE mechanics: a large, one-off pensionable payment (here, pay of £270,000 against an already-substantial £30,000 opening pension) produced £82,400 — £22,400 over the line
✓ Real breaches from ordinary pay progression alone are rarer than the headlines suggest — tapering (high income) and large one-off pensionable events are the more common real-world triggers

Annual Allowance Calculator
Run your own opening and closing pension figures through this exact calculation.
Try it

Why trust this guide

✓ Every figure on this page is computed at build time from this site's own real pensionEngine.ts functions (CARE_ACCRUAL_RATE, DEFAULT_REVALUATION_RATE, estimatePensionInputAmount) — not hand-typed numbers that could drift out of sync with the site's own calculator
✓ Uses the real 1/54th accrual rate and the same CPI+1.5% / CPI planning assumptions as this site's NHS Pension Calculator and Annual Allowance Calculator
✓ Honestly shows that ordinary pay progression rarely breaches the standard allowance on its own, rather than exaggerating the risk for effect
✓ Flags the separate legacy final-salary-link mechanism (for pre-2015 service) as out of scope here, rather than conflating it with CARE accrual
✓ Independent and not affiliated with NHS England, NHS Pensions/NHSBSA, HMRC or the DHSC — this is educational context, not financial or tax advice

Annual Allowance Tax Charge Explained

The summary-level mechanics this page expands into full worked examples.

Tapered Annual Allowance: Worked Examples

What happens when a high-income year also reduces the allowance itself.

Carry Forward: Worked Examples

How unused allowance from previous years can absorb a Scenario 3-style spike.

NHS Pension Scheme (2015) Explained

The full CARE accrual and revaluation mechanics behind this calculation.

Annual Allowance Calculator

Run your own figures through this exact formula.

This guide is independent, general information only — not financial or tax advice — and FrontlinePay is not affiliated with NHS England, NHS Pensions/NHSBSA, HMRC or the Department of Health and Social Care. The worked examples use illustrative pay and pension figures and stated planning assumptions for CPI and scheme revaluation — they are not a calculation of your own position. Confirm your own opening and closing pension figures against your NHS Pensions Annual Benefit Statement, and use the Annual Allowance Calculator or a specialist adviser for your own numbers.

Frequently asked questions

What's the actual formula for the Pension Input Amount? +

Broadly: take your closing annual pension for the scheme year, subtract your opening annual pension revalued for CPI, and multiply the result by 16. The opening and closing figures themselves come from the 2015 CARE Scheme's own accrual and revaluation mechanics — each year you bank 1/54th of that year's pensionable pay, added to your existing pot after it's been revalued at CPI+1.5%. This page walks through that full calculation with real numbers, rather than stopping at the summary formula.

Why does my Pension Input Amount go up even in a year with no pay rise at all? +

Because the rate used to grow your pension while you're an active member (CPI+1.5%) is higher than the rate HMRC uses to revalue your opening figure for the Annual Allowance test itself (CPI alone). That roughly 1.5%-a-year gap means even a completely flat salary, with zero promotion or pay award, still produces a small positive Pension Input Amount every year — see Scenario 1 below for the real numbers. It's rarely enough on its own to threaten your Annual Allowance, but it explains why your Pension Input Amount is never exactly zero.

Does a normal promotion or pay rise risk breaching the £60,000 Annual Allowance on its own? +

For most NHS grades, no — as Scenario 2 below shows, even a genuine, meaningful promotion produces a Pension Input Amount well under the standard allowance, because the 1/54th accrual rate means a single year's extra pay only banks a modest extra slice of pension. Real breaches from pure CARE accrual growth generally need either a very large, one-off pensionable payment in a single year (Scenario 3), a much larger existing pension already accrued from long service, or tapering because of high income — see our other worked-example guides for those.

What kind of event actually causes a big enough Pension Input Amount to breach the standard allowance? +

In practice, a genuinely large, one-off pensionable payment landing in a single scheme year is one of the more realistic causes for staff who aren't high earners — for example, a substantial backdated pay award, banding regrade arrears, or a large clinical excellence award all treated as pensionable pay in one tax year, rather than spread across the years they were actually earned. Scenario 3 below works through exactly this kind of event with real numbers.

Does this include the effect of legacy 1995 or 2008 Section final-salary benefits? +

No — this page deliberately stays focused on the 2015 CARE Scheme's own accrual and revaluation mechanics, consistent with how this site's Annual Allowance Calculator models the Pension Input Amount. Members with pre-2015 service have a further, separate consideration: a pay rise can also increase the value of a frozen final-salary benefit linked to their final pensionable pay at retirement, which can add its own, sometimes much larger, contribution to that year's total Pension Input Amount. That's a genuinely different mechanism from the CARE accrual shown here, and worth checking specifically with NHS Pensions or a specialist adviser if you have significant pre-2015 service.

If a scenario here shows I might breach my allowance, does that mean I owe tax immediately? +

Not necessarily — a Pension Input Amount above your Annual Allowance is only a potential chargeable amount before carry-forward is applied. Unused Annual Allowance from the previous three tax years can often reduce or fully absorb an apparent breach. See our Carry Forward: Worked Examples guide, and check your own position with the Annual Allowance Calculator, before assuming a breach shown here becomes an actual tax bill.

What CPI and revaluation assumptions does this page use, and why? +

For the scheme's own in-service revaluation of your existing pension pot, this page uses CPI+1.5% (modelled at 2.5%), the same long-run planning assumption this site's NHS Pension Calculator uses elsewhere. For revaluing the opening figure specifically for the Annual Allowance test, it uses a 2% CPI planning assumption, consistent with the default in this site's own Annual Allowance Calculator. Both are stated planning assumptions for illustration, not a prediction of actual future inflation.

Step	Calculation	Result
New accrual	£58,000 × 1/54	£1,074
Closing pension	£14,000 × 1.025 + £1,074	£15,424
Revalued opening	£14,000 × 1.02	£14,280
Growth	£15,424 − £14,280	£1,144
Pension Input Amount	£1,144 × 16	£18,305

Step	Calculation	Result
New accrual	£270,000 × 1/54	£5,000
Closing pension	£30,000 × 1.025 + £5,000	£35,750
Revalued opening	£30,000 × 1.02	£30,600
Growth	£35,750 − £30,600	£5,150
Pension Input Amount	£5,150 × 16	£82,400

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