Pension Input Periods and the Annual Allowance: A Technical Guide

The pension input period (PIP) is the timeframe over which pension savings are measured for annual allowance (AA) purposes. For most pension savers, the PIP is simply the UK tax year — 6 April to 5 April — and the connection to annual allowance planning is straightforward. But for those with defined benefit pensions, overseas pension arrangements, or who have been internationally mobile, the calculation of pension inputs within the PIP is more complex than it might appear.

What Is a Pension Input Period?

The pension input period defines the measurement window for pension saving activity that counts against the annual allowance in a given tax year. The pension input is the total amount of pension saving during that period.

For defined contribution arrangements, the pension input is simply the total of all contributions — employee, employer, and any third-party contributions — made to the scheme during the PIP.

For defined benefit arrangements, the pension input is calculated using an actuarial formula based on how much the member's pension accrual grew during the PIP.

The 2016 Alignment: All PIPs Now Follow the Tax Year

Before 6 April 2016, PIPs could end on any date within the tax year — different schemes could have different PIP end dates, and members could have multiple overlapping PIPs from different employers. This created significant complexity when trying to calculate annual allowance usage.

The Finance Act 2016 standardised all PIPs to align with the tax year. From 6 April 2016 onwards, every pension input period runs from 6 April to 5 April. There are no exceptions for active pension arrangements.

For the transitional year 2015–16, a split year arrangement applied. This created a "pre-alignment" period (up to 8 July 2015) and a "post-alignment" period (9 July 2015 to 5 April 2016) with special rules about how annual allowance was calculated across the two halves. The transitional rules for 2015–16 are now beyond the carry forward window for most people (three years of carry forward from 2026–27 reaches back only to 2023–24), though they may still be relevant for specific historical DB scheme calculations.

Defined Contribution PIP Calculation

For DC arrangements, the pension input for the PIP is:

Total gross contributions in the tax year = Employee contributions + Employer contributions + Third-party contributions

This includes:

• Regular salary sacrifice contributions
• Additional voluntary contributions (AVCs)
• One-off lump sum contributions
• Employer contributions (whether linked to employee contributions or not)
• Tax relief added by the scheme under relief at source

For relief at source schemes, the gross contribution (including the 20% HMRC top-up) is counted, not just the net amount paid. A £80 personal contribution becomes £100 gross after tax relief, and it is the £100 that counts against the annual allowance.

Investment returns are excluded. The annual allowance test does not measure fund growth — only contributions. A pot that doubles in value due to market returns has generated zero pension input in the year, regardless of how much it has grown.

Defined Benefit PIP Calculation

For DB schemes, the pension input is a formula:

Pension Input = (Opening pension × CPI adjustment × 16) minus (Opening pension × 16) PLUS Closing pension × 16 minus Opening pension × 16 adjusted

More precisely, the formula is:

Pension Input = [(Closing pension) − (Opening pension × CPI adjustment)] × 16 + (Closing lump sum − Opening lump sum × CPI adjustment)

Where:

• Opening pension is the member's pension accrued at the start of the PIP (5 April of the prior year)
• Closing pension is the member's pension accrued at the end of the PIP (5 April of the current year)
• CPI adjustment is the change in the Consumer Prices Index for the September preceding the start of the tax year (i.e., for the 2026–27 PIP, the September 2025 CPI figure is applied to revalue the opening value)
• The multiplier of 16 converts the annual pension income to a capital value

The CPI adjustment protects the member from a pension input arising purely from statutory revaluation — it only counts "real" accrual above inflation.

Example: A member's opening DB pension is £20,000 per year. CPI is 3%. The member's closing pension is £21,500 per year. The pension input is:

(£21,500 − £20,000 × 1.03) × 16 = (£21,500 − £20,600) × 16 = £900 × 16 = £14,400

This is well within the standard £60,000 AA and causes no charge.

In a year of significant salary growth or promotion: If the same member was promoted and their closing pension jumped to £24,000 per year:

(£24,000 − £20,600) × 16 = £3,400 × 16 = £54,400

Still within the standard AA, but approaching the limit. A further year of strong growth could breach £60,000.

Lump sum schemes: Where the DB scheme provides a separate automatic lump sum (as many 1/80th schemes do), the lump sum component is also included in the pension input calculation. The same CPI adjustment applies to the opening lump sum.

Why the 16× Multiplier?

The multiplier of 16 is a statutory approximation that converts a DB income stream to a capital equivalent for comparison with DC contributions. It is not a precise actuarial figure — it does not adjust for age, mortality rates, or scheme-specific factors. A 40-year-old consultant accumulating a £1,000 increase in annual DB pension has a pension input of £16,000, the same as a 60-year-old accumulating the same increase — despite the fact that the 40-year-old's benefit is economically worth far more (many more years of payment ahead).

This bluntness means that younger members of DB schemes can accumulate very large pension inputs in growth years without the actuarial cost being proportionately high. Conversely, members approaching NPA may find the pension input calculation overstates the economic cost because they have fewer years of benefit payment remaining.

Split Year Treatment for Expats

When an individual becomes or ceases to be UK resident part-way through a tax year, HMRC's split year treatment applies to their UK income tax position. For pension input period calculations, split year treatment creates a specific set of rules.

Arriving in the UK mid-year: If you were not UK resident at the start of the tax year but became UK resident part-way through (say, on 1 January 2026), your PIP for UK pension purposes runs from 6 April 2025. However, the pension inputs from a UK-registered scheme (if you were a member before arrival) or overseas scheme may need to be apportioned.

Leaving the UK mid-year: If you leave the UK mid-year and qualify for split year treatment, the overseas workday relief and foreign income rules interact with pension planning. For pension inputs, UK-registered scheme contributions continue to count in full regardless of where you are resident, because annual allowance applies to contributions to UK-registered schemes. Overseas scheme contributions may or may not count depending on whether the overseas scheme is a "relieved non-UK pension scheme."

Non-UK employers and pension: Where a non-UK employer contributes to a UK-registered pension for an employee who has moved abroad, those employer contributions still count as pension inputs under the UK annual allowance rules. The scheme must report the inputs to HMRC in the normal way.

Overseas Pension Scheme Interactions

Contributions to overseas pension schemes — including QROPS and non-UK registered arrangements — may count as pension inputs for annual allowance purposes where a "relevant non-UK scheme" (RNUKS) contribution is made.

A RNUKS is an overseas scheme that:

• Is not UK-registered, and
• Has received UK tax relief at any point

Where the conditions are met, contributions to overseas schemes are pension inputs that count against the annual allowance alongside UK scheme contributions. HMRC's interaction with overseas scheme administrators is less direct, and self-assessment reporting is essential.

QROPS interactions post-transfer: Once a pension has been transferred to a QROPS, further contributions to the QROPS by the former member may or may not generate UK annual allowance inputs depending on whether the QROPS continues to qualify for UK tax relief. Once a pension has been fully transferred and the member is no longer a UK resident or UK taxpayer, the UK annual allowance framework typically ceases to apply.

Practical Implications for Annual Allowance Monitoring

1. Obtain annual pension input statements. For DB scheme members, request an annual allowance pension savings statement from your scheme. This sets out the calculated pension input for the PIP. Schemes are required to provide this automatically where inputs exceed £60,000; below that threshold, you may need to request it.

2. Aggregate across all schemes. If you are a member of multiple pension arrangements — a DC workplace pension, an old DB deferred pension still accruing revaluation, a personal SIPP, and a previous employer's DB scheme — all pension inputs must be aggregated.

3. Check contribution confirmation for DC. For DC schemes, review your annual benefit statement or online pension account to confirm total gross contributions (including employer and HMRC top-up). Do not rely solely on payslip figures, which show net amounts.

4. Flag inter-year carry forward. If your pension input is below the AA this year, the unused AA can be carried forward for up to three years. Record each year's pension input against the available AA so you can accurately calculate carry forward capacity.

How Global Investments Can Help

Global Investments supports internationally mobile individuals in managing their UK pension annual allowance position across complex multi-scheme and multi-jurisdictional arrangements. Whether you have a DB pension with an NHS or public sector employer, multiple DC pots with former employers, and overseas contributions from a non-UK employer, we can aggregate your pension inputs, calculate your annual allowance position, and identify any charge exposure before the tax year end. Our team can also advise on split year treatment for those recently arriving in or departing from the UK. Contact us before 5 April to ensure your annual allowance position is fully managed.

This guide is for information only and does not constitute financial or tax advice. Pension and tax legislation can change. Always seek regulated financial advice tailored to your circumstances.