How Employer Pension Contributions Work for Tax
When a company makes a contribution to a director's SIPP or SSAS, that contribution is treated as a business expense for corporation tax purposes — provided it meets the HMRC test of being "wholly and exclusively" for the purposes of the trade. In practice, HMRC accepts that pension contributions forming part of a director's overall remuneration package meet this test, as long as the total remuneration (salary plus pension) is not excessive relative to the commercial value of the director's services.
The tax saving is immediate and certain. If a company pays £60,000 into a director's SIPP in a year when it pays corporation tax at 25%, the corporation tax bill falls by £15,000. The contribution goes into the pension at full face value — there is no income tax or National Insurance deducted before the money enters the fund. By comparison, a salary of £60,000 would trigger employer's National Insurance of approximately £8,000 and income tax of £24,000 at the 40% rate, leaving the director with only £36,000 after tax and the company £68,000 poorer. The pension contribution achieves a better outcome for both parties.
Pension Contributions Save National Insurance
One of the most frequently overlooked advantages of pension contributions over salary is the National Insurance saving. Employer contributions to a SIPP attract no employer's National Insurance (currently 13.8%). If a company pays £60,000 into a pension instead of paying the same amount as additional salary, it saves approximately £8,280 in employer NI. That saving either stays in the company or can itself be contributed to the pension — further improving the director's retirement position.
Employees also pay no employee National Insurance on pension contributions. So compared to a salary increase, a pension contribution saves NI on both sides. For directors who have already maximised their salary to the primary threshold (£12,570 in 2024/25), pension contributions are almost always more NI-efficient than additional salary, and the combined NI saving can be very material at higher contribution levels.
Timing Contributions to Maximise Corporation Tax Relief
Corporation tax relief on a pension contribution is obtained in the accounting year in which the contribution is actually paid. This gives directors a useful planning opportunity: in years when the company has high profits — and therefore a large corporation tax liability — making a substantial pension contribution reduces that liability directly.
If the company's year-end is approaching and profits are higher than expected, a large pension contribution paid before the year-end reduces the taxable profit and the resulting corporation tax bill. Using carry-forward rules, this contribution could be much larger than the standard £60,000 annual allowance — potentially £120,000–£180,000 or more, depending on the director's unused allowances in the previous three years.
However, timing must be genuine — the contribution must actually be received by the SIPP before the accounting year-end. Accruals basis accounting does not apply here; HMRC requires the payment to be made, not merely committed to. Keep bank records and SIPP administration confirmation as evidence of the payment date. For SSAS schemes, the SSAS bank account must show receipt before the year-end.
Pension Contributions vs Salary vs Dividends: The Tax Comparison
Directors of owner-managed businesses typically take income through a combination of salary, dividends and pension contributions. The optimal mix depends on individual circumstances, but pension contributions often form the most tax-efficient element of the package for building long-term wealth.
Salary is the most straightforward but least tax-efficient above the primary threshold: it attracts income tax and NI on both sides. Dividends avoid employee NI but do not attract corporation tax relief — the company pays CT on the profit before the dividend is paid. Pension contributions attract full corporation tax relief, no NI on either side, and the money enters the pension at gross value where it immediately benefits from tax-free growth.
For a director who does not need the cash immediately and can afford to lock the money away until retirement, maximising pension contributions in high-profit years and drawing modestly in lower-profit years is frequently the most tax-efficient strategy. Speak to your accountant about coordinating pension contributions with your overall remuneration structure. We can work alongside your accountant to ensure your SIPP or SSAS is structured to receive contributions in the most advantageous way.