Payroll Basics for Small UK Employers: What You're Responsible For

Taking on your first employee is a milestone, but it also means taking on a set of legal responsibilities that don't get much airtime until you're already in the middle of them. Payroll isn't just "paying people" — it's a recurring compliance obligation with HMRC, and getting it wrong has real consequences. Here's what a small UK employer is actually responsible for.

Registering as an employer

Before you pay anyone, you need to register as an employer with HMRC. This needs to happen before your first payday, and there are lead times involved, so it's not something to leave until the week you take someone on. Once registered, you'll be given the references you need to operate PAYE.

Running PAYE correctly, every pay period

Pay As You Earn (PAYE) is the system through which you deduct Income Tax and National Insurance from an employee's pay before they receive it, and pass those deductions on to HMRC. As the employer, you're responsible for:

• Calculating the correct deductions each pay period, based on each employee's tax code and circumstances.
• Reporting pay and deductions to HMRC on or before each payday, through Real Time Information submissions.
• Paying over the tax and National Insurance you've deducted, plus employer's National Insurance contributions, by the relevant deadline.
• Issuing payslips showing gross pay, deductions and net pay for every payment.

Rates, thresholds and allowances change and are reviewed periodically, so always check the current figures on gov.uk rather than relying on what applied last year.

Workplace pensions and auto-enrolment

Most employers have a legal duty to automatically enrol eligible staff into a workplace pension scheme and to contribute to it. This applies from the point you take on your first employee, and it comes with its own ongoing duties — assessing staff at each pay run, keeping records, and re-enrolling eligible staff periodically. It's easy to treat this as a one-off setup task, but it's actually a recurring compliance obligation that runs alongside every payroll.

Statutory pay and leave

As an employer you're also responsible for administering statutory entitlements when they apply — statutory sick pay, statutory maternity, paternity and adoption pay, and holiday pay, among others. Each has its own qualifying conditions and calculation rules, and getting them wrong can leave you owing an employee money, or reporting inaccurate figures to HMRC. This is one of the areas where good record-keeping from day one saves a lot of retrospective untangling.

Keeping records

You're legally required to keep payroll records for a set number of years, covering pay, deductions, leave, and reports sent to HMRC. These records aren't just a filing formality — they're what you'd need to hand over if HMRC ever queried a payment, and what an employee might reasonably ask to see if there's ever a dispute about their pay.

Where this fits with the rest of your finances

Payroll doesn't sit in isolation — it feeds directly into your management accounts, your cash flow forecasting, and your year-end figures, so getting it wrong doesn't just create a compliance problem, it distorts the numbers you're relying on to run the business. If payroll is something you're setting up for the first time, it's worth having it sit alongside your bookkeeping rather than bolted on as an afterthought.

This is general information, not personalised advice for your specific circumstances — payroll rules have a lot of edge cases, so if you're about to take on your first employee, it's worth talking it through with an accountant before your first payday arrives.