If you run a business with employees, workplace pension contributions are not optional — and getting them wrong can lead to fines from The Pensions Regulator. Yet in our experience, a surprising number of small employers are fuzzy on the detail. They know they have to pay something into a pension, but they are not entirely sure how the numbers are calculated, who qualifies, or what the employee’s share looks like on a payslip.

Employee pension contributions sit at the heart of auto-enrolment, a system introduced in 2012 that has brought more than 22 million people into workplace pension saving. The rules have not changed dramatically since 2019, but the obligations are real — and for any employer setting up payroll for the first time, understanding them from day one matters.

Below we walk through how the system works, what counts as qualifying earnings, and what both employers and employees are actually paying in 2026/27.

Auto-enrolment requires most UK employers to automatically enrol eligible workers into a qualifying workplace pension scheme. Eligible workers are broadly those aged between 22 and State Pension age who earn above £10,000 per year. Once enrolled, both the employer and the employee contribute — and those contributions are calculated against a specific band of earnings, not total pay.

For the 2026/27 tax year (6 April 2026 to 5 April 2027), the minimum total contribution is 8% of qualifying earnings. Of that 8%, the employer must contribute at least 3%, which means the employee’s minimum share is 5%. These rates have been in place since April 2019.

It is worth being clear: the 3% employer minimum is a floor, not a target. Many employers — particularly those competing for good staff — choose to contribute more. Some pension schemes are structured so the employer matches employee contributions up to a higher level. That is a commercial decision, and it can be a genuine differentiator when recruiting.

If an employee earns below the £10,000 threshold, they are not automatically enrolled — but they do have the right to opt in if they want to, and the employer must contribute if they do.

This is the bit that trips people up. Contributions are not calculated on total pay — they apply only to earnings that fall within a specific band. For 2026/27, that band is earnings between £6,240 and £50,270 per year.

So if an employee earns £30,000, you do not calculate 8% on £30,000. You calculate 8% on £30,000 minus £6,240 — which is £23,760. The 8% applies to that qualifying portion only.

Qualifying earnings include more than just basic salary. Wages, bonuses, commission, overtime pay, and statutory payments such as Statutory Sick Pay and Statutory Maternity Pay all count. So if an employee picks up a bonus in the year, that bonus feeds into the qualifying earnings calculation.

The upper limit of £50,270 mirrors the higher-rate income tax threshold, so for most employees the full band is in play. For higher earners, contributions are only calculated up to that ceiling under the qualifying earnings method — though some pension schemes use a different definition of pensionable pay, and the rules can vary. If your scheme uses a different basis, check the scheme rules carefully.

Getting the calculation right matters. Underpayments — even small ones — can result in back payments and penalties if the Regulator investigates.

For a small employer, the pension obligation is a genuine payroll cost and it needs to be budgeted for properly. The 3% employer contribution on qualifying earnings adds up, particularly if you have several members of staff or pay competitive wages.

To give a rough sense of scale: an employee earning £28,000 has qualifying earnings of approximately £21,760 (£28,000 minus £6,240). The employer’s 3% minimum contribution on that is around £653 per year — roughly £54 per month. Multiply that across a team of five and it is a meaningful line item.

We see employers underestimate this cost when they are hiring for the first time, particularly when setting annual salary budgets. Pension contributions are on top of employer National Insurance — both need to factor into your true cost-per-employee figure.

One area worth thinking about: salary sacrifice arrangements. Under a salary sacrifice scheme, the employee reduces their gross salary by their pension contribution amount, which means both the employer and employee pay less National Insurance. Done correctly, this can reduce the overall cost of pensions for the business while the employee ends up in the same (or better) position. It is not the right fit for every business, but for employers with payroll already set up in a cloud system like Xero or QuickBooks, it is relatively straightforward to implement.

If you are unsure whether your current setup is cost-efficient, that is exactly the kind of thing worth reviewing with your accountant.

Employee pension contributions attract tax relief — and this is the detail that employees often overlook when they see the deduction on their payslip and wince.

In a relief-at-source scheme (the most common type for auto-enrolment), the pension provider claims basic-rate tax relief at 20% from HMRC and adds it to the employee’s pot. In practice, this means an employee only pays 80p in every £1 of contribution, with the government topping up the rest. For a higher-rate taxpayer, additional relief can be claimed through Self Assessment.

To put that concretely: if an employee contributes £100 per month to their pension, the actual reduction in their take-home pay is £80 (not £100), because the £20 tax relief is automatically added to their pension pot by the provider.

This is genuinely good value for employees, and it is worth communicating clearly — especially to staff who are new to workplace pensions and instinctively see the deduction as a loss rather than a benefit.

Some employees choose to opt out of auto-enrolment, which they are legally entitled to do. If they opt out within one month of being enrolled, any contributions are refunded. However, employers must re-enrol eligible staff every three years, so opting out is not permanent. It is also worth noting that opting out means missing out on both the employer contribution and the government tax relief — a combination that is difficult to replicate elsewhere.