Why payroll feels harder than it is

If there is one job in a small business that people put off, it is payroll. Not because the arithmetic is difficult, but because the rules come in layers and the deadlines do not move. Income tax, National Insurance, pension contributions and Real Time Information reporting all land on the same pay run, and getting one of them wrong can mean a letter from HMRC and an awkward conversation with a member of staff.

The good news is that cloud payroll software does the heavy lifting. What software cannot do is make the decisions for you: which tax code to use, whether someone counts as a director, when to enrol a new starter into a pension, or which day the money has to reach HMRC. This article walks through the main moving parts so you can run a payroll with confidence.

PAYE: collecting income tax as you pay

PAYE stands for Pay As You Earn, and that is exactly what it does — you collect income tax gradually across the year rather than handing the employee a bill in January. Each employee has a tax code issued by HMRC, and for most people in the 2025/26 tax year the standard code is 1257L, which reflects the £12,570 personal allowance.

Once you have the code, the rate bands apply:

• The first £12,570 of earnings is normally tax free.
• Earnings up to £50,270 are taxed at 20% (basic rate).
• Earnings up to £125,140 are taxed at 40% (higher rate).
• Anything above that is taxed at 45% (additional rate).

Most codes are cumulative, meaning each pay run looks at year-to-date pay and corrects itself as the year goes on. If a new starter has no P45, ask them to complete a starter checklist rather than guessing a code — getting this wrong is one of the most common causes of a surprise tax bill for an employee.

National Insurance: two charges, not one

This is where new employers often get caught out, because National Insurance is charged twice: once on the employee and once on you.

• Employee NIC is deducted from wages at 8% on earnings between £12,570 and £50,270, then 2% on anything above that.
• Employer NIC is paid by the business on top of salary, at 15% on earnings above the £5,000 secondary threshold.

That employer charge is a genuine cost of hiring and needs to be built into your budget, not discovered later. The Employment Allowance can reduce your employer NIC bill by up to £10,570 a year if you are eligible, though there are restrictions — for example, where the only employee is a director. Directors also have the option of an annual earnings period, which spreads NIC calculations across the whole tax year rather than pay by pay, and is often worth discussing with your accountant.

Pensions and automatic enrolment

Automatic enrolment is a legal duty, not an optional benefit. You must enrol a member of staff if they are aged between 22 and State Pension age and earn more than £10,000 a year. Staff outside that bracket can usually ask to join, and you must pass on their contributions if they do.

Minimum contributions are 8% of qualifying earnings, of which at least 3% must come from you as the employer. Qualifying earnings sit between £6,240 and £50,270, although some schemes use pensionable pay or total earnings instead — check which basis your scheme uses before you calculate anything. Two practical points worth remembering:

• You can postpone enrolment by up to three months, but you must write to the employee and still handle anyone who wants to join sooner.
• You must re-enrol eligible staff roughly every three years, so set a reminder in your calendar.

Real Time Information and payment deadlines

Every pay run needs a Full Payment Submission sent to HMRC on or before the day you pay your staff. If you are claiming the Employment Allowance, or you have a month with no pay to report, you also need to submit an Employer Payment Summary.

The tax, NIC and student loan deductions you collect need to reach HMRC by the 22nd of the following month if you pay electronically, or the 19th if you pay by post. If your average monthly liability is under £1,500, you can usually pay quarterly instead — a useful cash-flow benefit for very small employers. Late filing penalties start at £100 per scheme per month and rise the longer you leave it, and interest accrues on late payments, so filing a few days early is nearly always cheaper than filing late.

Habits that keep payroll clean

Most payroll problems are avoidable with a bit of routine. A few habits that pay off:

• Fix a payday and work backwards from the HMRC deadline, allowing time for bank transfers.
• Keep complete records for every employee: full name, date of birth, address, National Insurance number, tax code, and their P45 or starter checklist.
• Treat employer NIC and pension contributions as part of the cost of each hire when you set salaries.
• Reconcile the payroll report to your bank statement and your bookkeeping ledger every month, so wages, tax and pension costs all agree.
• Double-check the first pay run of the new tax year, when codes and thresholds change.
• Remember the year-end jobs: P60s to employees by 31 May and any P11D benefits reported by 6 July.

Get these basics right and payroll becomes a routine twenty-minute task rather than a source of dread. Your staff get paid correctly and on time, HMRC stays quiet, and you can get back to the work that actually grows the business.