What Is Accountancy Payroll and Does Your UK Business Need a Payroll Accountant?

If you employ staff, you have a legal obligation to operate a payroll scheme. But "accountancy payroll" is not just about pressing a button at the end of each month. It covers the full cycle of paying your people correctly: registering with HMRC, running gross-to-net calculations, submitting Real Time Information (RTI) reports, handling pension auto-enrolment, processing leavers and starters, and filing year-end returns.

Many business owners assume their general bookkeeper can handle payroll. Some can. But payroll in accounting is a specialised area. Get it wrong and you face HMRC penalties, underpaid tax, and upset employees. This post explains what accounting and payroll really involves, when you need a dedicated payroll accountant, and how to avoid the costly mistakes we see most often.

What Does Accountancy Payroll Actually Cover?

At its simplest, payroll is the process of calculating what each employee should be paid and ensuring the correct tax and National Insurance (NI) reaches HMRC. But accounting of payroll goes further. It includes:

• Setting up the PAYE scheme. You must register with HMRC before you pay your first employee. HMRC issues a PAYE reference number and an Accounts Office reference. This is step one.
• Collecting starter information. Each new employee gives you a starter checklist (formerly P46) or a P45 from their previous employer. You need their tax code, student loan status, and NI number.
• Gross-to-net calculations. This is the core of payroll. You calculate gross pay (salary, overtime, bonuses, commissions), then deduct income tax (via PAYE), employee NI, pension contributions, student loan repayments, and any other deductions (childcare vouchers, court orders).
• RTI submissions. Every time you run payroll, you must send an RTI report to HMRC before or on the day you pay your employees. This tells HMRC exactly what each employee earned and what was deducted. Late or missed RTI submissions attract penalties.
• Employer NI calculations. Employer NI is 13.8% of earnings above the secondary threshold (£9,100 for 2025/26). This is your cost, not the employee's. You pay it to HMRC along with the employee deductions.
• Pension auto-enrolment. Since 2012, every employer must automatically enrol eligible employees into a workplace pension scheme. You must deduct contributions, pay your own employer contribution (minimum 3% of qualifying earnings), and submit contributions to the pension provider on time. The Pensions Regulator fines businesses that fail to comply.
• Processing leavers. When an employee leaves, you issue a P45 showing their earnings and deductions to date. You also stop their pension enrolment and update HMRC via the next RTI submission.
• Year-end reporting. After 5 April each year, you must file a P60 for each employee (a summary of their total pay and deductions) and a P11D(b) if you provided benefits in kind. You also finalise your PAYE scheme for the year.
• Expenses and benefits. If you reimburse employee expenses or provide benefits (company car, private medical insurance, gym membership), these must be reported on a P11D or payrolled through the software. Payrolling benefits is increasingly common and avoids the annual P11D filing.

That is a lot of moving parts. And each one has a deadline, a specific HMRC form, and a penalty if missed.

Do You Need a Payroll Accountant or Can You DIY?

Many small businesses run payroll themselves using software like Xero, FreeAgent, Sage 50, BrightPay, or QuickBooks Payroll. These tools automate the gross-to-net calculations and RTI submissions. For a sole director with no other staff, DIY payroll is straightforward. You pay yourself the minimum salary, run it through the software once a month, and submit the RTI return.

But the moment you have employees, the complexity multiplies. Consider a 4-employee software consultancy in Manchester turning over £420,000. The director pays herself a £12,570 salary and takes dividends. The three developers are on salaries between £35,000 and £55,000. One has a student loan (Plan 2). Another opted out of the pension. The third just started and handed in a P45 from a previous job where they earned £28,000 so far this year.

That consultancy needs accurate payroll. The director needs to know:

• What tax code applies to each employee (and why HMRC may change it mid-year).
• How much employer NI to budget for (it adds up quickly at 13.8% above £9,100).
• Whether the Employment Allowance of up to £10,500 can offset the employer NI bill (it can, for most businesses with employer NI below that threshold).
• When to send the RTI submission (before payday, every time).
• How to handle the student loan deduction (it is not optional).
• What to do when an employee goes on sick leave (SSP calculations and HMRC notification).

That is where a payroll accountant adds value. We do not just run the numbers. We check the tax codes, flag anomalies, handle HMRC queries, and keep you compliant with pension regulations. The cost of a payroll accountant is typically £20 to £50 per employee per month. The cost of a single HMRC penalty for late RTI submissions is £400 per month for a business with 10 to 49 employees (first offence, escalating). The maths favours professional support.

What Happens When Payroll Goes Wrong?

We have seen the same mistakes repeat across dozens of businesses. Here are the most common:

Late RTI submissions. HMRC charges penalties based on the number of employees you have and how late the submission is. For a business with 10 employees, a single late submission in a month triggers a £200 penalty. Repeat offences escalate quickly. The only defence is a "reasonable excuse" (e.g. serious illness, software failure, HMRC system outage). "I forgot" is not a reasonable excuse.

Wrong tax codes. If you use the wrong tax code, an employee could underpay or overpay tax. HMRC will eventually correct it, but the employee will blame you. And if the underpayment is significant, HMRC may pursue you for the unpaid tax.

Missed pension deadlines. The Pensions Regulator fines businesses that fail to enrol staff on time or fail to pay contributions. Fines start at £400 for a business with 5 to 49 employees and increase for continued non-compliance. We have seen a Birmingham café hit with a £2,500 fine for failing to re-enrol a staff member who opted out two years earlier.

Incorrect leaver processing. If you do not issue a P45 or fail to stop pension contributions for a leaver, you continue to accrue obligations. HMRC will expect tax and NI on earnings you are not actually paying. Untangling this takes time and correspondence.

Muddled director's loan account. When a director takes money from the company that is not salary, dividends, or expenses, it goes into the director's loan account. If the balance exceeds £10,000, it becomes a beneficial loan and must be reported on a P11D. If the loan is not repaid within 9 months and 1 day of the year-end, the company pays S455 tax at 33.75%. We have seen directors accidentally trigger this because their payroll did not properly track drawings versus salary.

Accounting and Payroll: How They Fit Together

Payroll in accounting is not a standalone function. It feeds directly into your wider financial reporting. Here is how:

• Profit and loss account. Gross salaries, employer NI, and pension contributions are all operating expenses. They reduce your taxable profit and your corporation tax bill.
• Balance sheet. Any PAYE/NI owed to HMRC at the year-end appears as a creditor. Pension contributions not yet paid to the provider also sit as a liability. Director's loan account balances appear as either an asset (company is owed money) or a liability (director has overpaid).
• Cash flow. Payroll is a recurring cash outflow. You need to know the net amount hitting your bank account each month and the separate payment to HMRC (usually due by the 22nd of the following month for electronic payments).
• Corporation tax. Your payroll costs directly affect your taxable profit. Accurate payroll means accurate corporation tax calculations. Overstate payroll and you overpay tax. Understate it and you risk an HMRC enquiry.

As ICAEW qualified accountants, we see payroll as part of the broader accounting picture. A payroll accountant who understands the full corporation tax implications of salary decisions is far more valuable than someone who just runs the numbers.

When Should You Outsource Payroll to an Accountant?

There is no single answer. But here are the triggers we see most often:

• You have more than 2 employees. At this point, the administrative load increases. Starters, leavers, tax code changes, and pension queries become frequent.
• You are already using an accountant for your year-end accounts. Adding payroll is usually straightforward and cost-effective. Your accountant already knows your business structure and tax position.
• You have employees with variable hours or irregular pay. Zero-hours contracts, overtime, and commission structures complicate gross-to-net calculations. Payroll software can handle it, but only if set up correctly.
• You provide benefits in kind. Company cars, private medical insurance, and gym memberships require P11D reporting or payrolling. Get it wrong and the employee faces an unexpected tax bill.
• You have been fined by HMRC or the Pensions Regulator. This is the clearest signal that your current payroll process is not working.
• You are spending more than 2 hours per month on payroll. Your time is worth more. Outsource the compliance and focus on growing your business.

If any of these apply, it is worth speaking to a payroll accountant about taking the work off your hands.

What to Look for in a Payroll Accountant

Not all accountants offer payroll services. Those that do should meet these criteria:

• Use recognised payroll software. BrightPay, Xero Payroll, Sage 50 Payroll, and FreeAgent are the most common. Avoid accountants who use spreadsheets for payroll. Spreadsheets are error-prone and do not submit RTI directly.
• Understand pension auto-enrolment. Your payroll accountant should handle the pension provider connection, contribution calculations, and re-enrolment cycles (every 3 years).
• Offer year-round support. Payroll issues do not only arise at year-end. You need someone who responds to HMRC notices, corrects errors, and advises on tax code changes as they happen.
• Provide clear reporting. You should receive a monthly payroll summary showing gross pay, deductions, net pay, employer costs, and the amount due to HMRC. No guesswork.
• Be ICAEW qualified or ACCA qualified. This is not essential for payroll-only services, but it signals a commitment to professional standards and ongoing training. Our ICAEW qualified team stays current with every legislative change.

How Much Does a Payroll Accountant Cost?

Pricing varies by provider and the complexity of your payroll. Typical ranges for 2025/26 are:

• Sole director, no employees: £10 to £20 per month. Often bundled with year-end accounts.
• 1 to 5 employees: £30 to £60 per month.
• 6 to 10 employees: £60 to £120 per month.
• 11 to 20 employees: £120 to £250 per month.
• Above 20 employees: Negotiable, often £10 to £15 per employee per month.

Some accountants charge a fixed monthly fee that includes payroll plus bookkeeping and year-end accounts. Others charge separately. Always ask what is included: RTI submissions, pension contributions, P60s, P11D(b), and HMRC correspondence should be standard.

Can You Handle Payroll Yourself With Software?

Yes, many businesses do. If you have one or two employees and a straightforward pay structure, software like FreeAgent or Xero Payroll can work well. The key is to:

• Set up the PAYE scheme correctly from the start.
• Use the correct tax codes (check HMRC's tax code tool or your employee's P45).
• Submit RTI on time every month (before payday).
• Handle pension auto-enrolment properly (including the re-enrolment cycle every 3 years).
• File P60s and P11D(b) by the statutory deadlines (31 May and 6 July respectively).
• Keep accurate records for 3 years after the end of the tax year (HMRC can ask to see them).

If you miss any of these steps, the penalties can quickly outweigh the cost of a payroll accountant.

Final Thoughts

Accountancy payroll is not just about paying people. It is about staying compliant with HMRC, the Pensions Regulator, and employment law. The accounting and payroll functions are deeply connected: one feeds the other. Get payroll wrong and your year-end accounts, corporation tax return, and cash flow forecasts will all be wrong too.

If your payroll is simple and you have the time to manage it, DIY is viable. But if you have employees, benefits, variable hours, or a history of errors, a payroll accountant is a cost-effective safeguard. The penalties for non-compliance far exceed the monthly fee.

If you are unsure whether your current payroll setup is compliant, get in touch. We can review your process, flag any risks, and take over the running if that makes sense for your business.