Over-Contributing to your Pension

by Daby Miranda, in ,

When planning for retirement, contributing to a pension is often one of the smartest financial decisions you can make. However, for those navigating retirement savings across both the UK and the US, things can get tricky—especially when it comes to over-contributing to a UK pension, where the limits are often inadvertently exceeded. This article gives an overview of what happens when you contribute more than the allowed limits, and how it impacts your tax situation.

 

What Is a Pension Over-Contribution?

Pension over-contribution occurs when you contribute more to your pension than the annual limits set by the relevant tax authorities. These limit your allowable contributions to your “relevant earnings” in the year and impose a limit on the tax advantages granted for retirement savings.

Relevant Earnings – This includes income from employment, self-employment and royalties. It does not include income from pensions, rentals and investments. This is not an exhaustive list.

Depending on your residency, citizenship, and tax status, you could find yourself facing penalties, additional tax liabilities, or unexpected reporting requirements—sometimes in both countries.

 

UK Tax Issues

You can contribute to your UK pension up to the level of that year’s relevant earnings – or £3,600 if you have no earnings.

However, only pension contributions up to an individual taxpayer’s Annual Allowance receive UK tax relief.  This is set at a maximum of £60,000 for 2025/26; but is still limited to annual earnings.

It is important to note that this applies to all contributions to all schemes made in the year – the total of employee, employer and gross contributions to a personal pension plan.

There are further limitations for high earners whereby the allowance is reduced by £1 for every £2 that “adjusted income” exceeds certain limits. There is a minimum annual allowance of £10,000 for 2025/26. This is discussed in more detail here.

What if I have over-contributed?

If you have made pension contributions over the annual allowance, you may be able to utilise unused Annual Allowance from the previous three years.

After considering any mitigation from earlier years allowances, if you have still over-contributed to your pension scheme, the excess contribution amount will be added back to your taxable income via your self-assessment tax return and will be subject to income tax rate at your marginal tax rate. This is the Pension Savings Charge.  

The charge can be paid out of personal savings or directly from the pension pot via a “Scheme Pays Election”. The choice of how to pay the charge comes down to personal circumstances. The decision will be whether to retain as much within the pension as you can if you expect to have a limited allowance in future years or preserve personal savings.

The next question is whether you should continue to over-contribute even with the charge. This should be discussed carefully with a Financial Adviser but there are a few factors that can help you decide:

  • Limiting contributions may limit the Employer’s Matching Contributions.
  • Some employers offer a “Payment in Lieu” of contributions. This is subject to income tax at the same rate as your pension charge but there is also National Insurance to pay.
  • Distributions out of the pension are still taxable, but usually at a lower rate in retirement and with a 25% tax-free lump sum.
  • Pensions are now within the scope of inheritance tax so using the pension for succession planning is a less viable option.
  • Will you be a UK resident at retirement? Pension planning opportunities may be available – more below
  • Are you a US taxpayer? You may be subject to further restrictions – more below…

 

US Tax Issues

Similar to the UK, in the US the IRS also set strict annual contribution limits, in addition to limits based on annual earnings. So, if you have a US tax filing obligation and use the Tax Treaty to exclude UK pension contributions from taxable income, you will have to consider the US pension limits too.

2025 US Contribution Limits

Plan Type Contribution / Benefit Limit
Defined Contribution Up to $70,000 total (includes max $23,500 employee contributions)
Defined Benefit Up to $280,000 of annual benefit
IRA (Traditional/Roth) Up to $7,000

You will only be able to exclude your contributions to a UK pension up to these limits (ignoring IRA limitations). If these have been exceeded, you may have more taxable compensation on your US return than expected.  Often this amount will be covered by Foreign Tax Credits in the US – but caution should be exercised if you are making a very large catch-up contribution to maximise the 3 years carry forward contribution limits available in the UK.

Planning opportunities – by not utilising the treaty and instead adding back the pension contributions into taxable income on a US tax return, you are able to build “basis” in the pension. This basis will pay out US tax-free on retirement. The additional income is “foreign source” so this would enable you to utilise excess foreign tax credits. This often has very little impact on the US tax due but with potentially significant benefits when you reach retirement.

As a UK resident, you will report the Pension Commencement Lump-Sum (PCLS – 25% UK tax-free amount) on your US return. This will give rise to a US liability and you will need rely on Foreign Tax Credits to absorb this. Building basis should help to alleviate some of this liability initially, but planning should be done as you approach retirement.

The impact of building basis is lessened if you will be a UK resident on retirement. UK tax will be paid on the regular distributions which will be available as a credit negating the need for basis. But the golden opportunity is if you plan to retire back in the US. In this scenario, the treaty allows you to claim the tax-free benefit of the PCLS (you must be residing in the US on distribution). And, if you have built up basis in the pension, your effective tax rate on further distributions will be very low. Over contributing to your UK pension in this instance also becomes more attractive.

 

In Conclusion…

Overcontributing to your UK pension can trigger complex tax issues, including additional charges and possibly double taxation—especially when navigating the rules of both jurisdictions.

For individuals subject to both tax systems, particularly US expats in the UK or UK citizens working in the US, it is important to carefully track contributions and understand the implications. As this is a highly technical and complex area, it is strongly recommended to seek professional advice to ensure compliance and effective planning.