The Founders Guide to Payroll: Your FAQs Answered

Tackling payroll? This guide breaks it down simply, from what you need to how PAYE works, and the questions founders ask most.

Payroll doesn’t have to be complicated, but it often becomes one of those things that founders second-guess. What needs to be done? What’s legally required? What can go wrong? And how can you keep it running without constant interruptions?

If you’re trying to understand how payroll actually works, what you need before you run it, how PAYE fits in, or when to outsource, you’ll find your answers here in our payroll FAQ run-down.

We’ll discuss: 

• What counts as payroll?

• What do you need in place before running payroll?

• How PAYE actually works

• What’s the difference between payroll, HR and bookkeeping?

• Common payroll mistakes

• How often does payroll need review?

• Which payroll software is worth your time?

• When should you outsource payroll?

• Quickfire round of founder FAQs

Let’s start from the top.

What counts as payroll?

Payroll isn’t just “paying people.” It’s the calculations, the reporting, and the quiet bits of admin that keep your team paid correctly… and on time.

For most small and growing businesses, payroll includes:

• Employee pay (salaries, hourly rates, overtime, bonuses, commissions)

• PAYE and National Insurance deductions

• Employer NI contributions

• Pension contributions and auto-enrolment

• Statutory payments (sick pay, maternity/paternity leave, etc.)

• Adjustments for starters, leavers, and changes mid-month

• Reporting to HMRC every time you run payroll (RTI submissions)

• Year-end tasks, like P60S and payroll summaries

If it affects what someone takes home, or what the business must report, it’s part of payroll.

Many founders only realise this once things get messy. That’s usually when errors pop up, deadlines get missed, or someone’s take-home pay isn’t quite what they expected.That’s why clear systems from the start save a lot of hassle later.

What do I need in place before running payroll?

Before you can run payroll properly, a few building blocks need to be set up. 

Here’s what you need in place:

A registered employer PAYE scheme

You’ll need to register as an employer with HMRC. This gives you your PAYE reference numbers so you can report payroll (RTI) and pay tax/National Insurance correctly.

Accurate employee information

Names, addresses, start dates, national insurance numbers, tax codes, salaries, and working patterns – if any of these are wrong, payroll will be wrong.

Contracts or agreed terms for how people are paid

Full-time, part-time, variable hours, commissions, bonuses: whatever it is, it needs to be recorded clearly so payroll can reflect it.

A pension scheme and auto-enrolment set up

If you employ staff, you’re legally required to assess them for auto-enrolment. This includes setting up a pension scheme and knowing who needs to be enrolled and when.

A system to track time, changes, or adjustments

Anything that affects pay, such as holidays, unpaid leave, overtime, and sick leave, needs to be consistently captured. 

Payroll software (or a provider) ready to run reports

Whether it’s Xero, BrightPay, Sage or another tool, you’ll need something that can calculate PAYE, generate payslips, and submit RTI to HMRC.

Once these pieces are in place, payroll becomes far more predictable.

How does PAYE actually work?

PAYE is the system HMRC uses to collect Income Tax and National Insurance from your employees’ pay. It can feel technical when you first come across it, but the process itself is straightforward once you know what happens at each step.

Every pay period, payroll does three things:

It works out what an employee has earned

This includes their salary or hourly pay, plus anything additional like overtime, bonuses, or statutory pay.

It applies the correct deductions

Using the employee’s tax code and National Insurance category, payroll calculates the amount of tax and NI that needs to be taken from their pay. If they’re in a pension scheme, contributions are included here too.

It reports the numbers to HMRC and pays the employee

Payroll sends HMRC a Real Time Information (RTI) submission, and the employee receives their net pay (the amount left after deductions). The tax and NI you owe as an employer are paid to HMRC afterwards, usually the following month.

Payroll vs. HR vs. Bookkeeping: what’s the difference?

In small and growing businesses, these areas often overlap. Keeping them separate, even if one person handles them, makes things far easier to manage.

Payroll

Payroll is the operational side of paying people: running calculations, applying tax codes, handling deductions, issuing payslips, and submitting reports to HMRC. It’s process-heavy and deadline-driven.

HR

HR covers the people-related decisions that sit around payroll, such as contracts, start dates, role changes, holiday policies, and anything that affects how someone should be paid. HR shapes the rules payroll follows.

Bookkeeping

Bookkeeping is where the numbers land. It records the cost of payroll in your accounts, handles expenses and invoices, and keeps your financial records up to date.

The most common payroll mistake

Payroll doesn’t usually go wrong because of complex rules; it goes wrong because of small gaps in process, communication, or timing. Here are the issues we see most often when teams are forced to juggle multiple responsibilities:

Changes aren’t recorded in one place

A salary increase mentioned in passing, a commission agreed over email, a starter who begins earlier than planned; if it isn’t captured somewhere consistent, payroll won’t reflect it. These small mismatches create most payroll errors.

Relying on outdated information

If tax codes, addresses, working patterns or pension details aren’t updated, the calculations will be wrong. Payroll only works with the data it’s given.

Forgetting to plan for payroll dates

Payday doesn’t always line up neatly with cash coming in. When payroll timing isn’t considered in cash-flow planning, founders can end up scrambling to move money around at the last minute.

Leaving payroll too late in the month

Running payroll at the last moment increases the risk of mistakes and gives no time to correct anything before payslips are sent. A steady monthly rhythm avoids unnecessary pressure.

Treating payroll changes as “one-offs” rather than part of a process

Bonuses, overtime, adjustments, new starters, leavers: they’re all normal. The issue is when they’re handled reactively instead of being fed into a clear workflow.

Not understanding the implications of late payments

If payroll is late, it affects compliance, morale, trust, and, depending on how late, HMRC penalties. 

How often should I review payroll?

Payroll doesn’t need constant attention, but it does benefit from routine. Most problems happen when it’s only looked at on the day it runs, which leaves no time to catch mistakes, update changes, or check that the timing still works for your cash flow.

A quick review a few days before payday is usually enough. That’s the moment to make sure any changes, from new starters to leavers, bonuses, adjustments, and holidays, have actually been captured somewhere and won’t come as a surprise. It’s also a good point to glance at upcoming cash flow and check that the payroll date still works for the month you’re in.

Every so often, it’s worth stepping back to make sure the bigger picture still makes sense: that tax codes are correct, pensions are up to date, and nothing has drifted out of alignment over the year. You don’t need to overthink it; just a bit of regular housekeeping so payroll doesn’t become stressful.

Do I need payroll software, or is a spreadsheet enough?

In the very, very early days, a spreadsheet can be enough. This is usually when you have a very small team, pay is consistent each month, and there are no pensions, variable hours, or frequent changes to deal with.

As soon as payroll starts to involve more moving parts, spreadsheets become harder to manage, however. Tax codes change, pension assessments kick in, statutory payments apply, and reporting to HMRC becomes more frequent. At that point, spreadsheets don’t necessarily fail because they’re wrong, but because they rely too heavily on manual checks and memory.

Payroll software and support help by:

• Applying tax codes and deductions automatically

• Handling pension assessments and contributions

• Submitting Real Time Information to HMRC

• Keeping a clear record of changes and history

Software doesn’t remove the need to understand payroll, but it does remove a lot of the manual steps that tend to cause errors. For most growing teams, it becomes the more reliable option once payroll stops being completely static.

When should I outsource payroll?

Most founders don’t outsource payroll because it’s complicated; they outsource it because it keeps pulling their attention at the wrong time. Payroll has fixed deadlines, no margin for delay, and real consequences if something is missed.

When you’re juggling hiring, delivery, clients and cash flow, that pressure builds.

Outsourcing makes sense when payroll is no longer a quick monthly task. If changes happen often, if you’re spending too much time correcting small errors, or if payroll regularly interrupts more important work, it’s usually a sign that it needs dedicated support.

It can also help when your team grows, and the rules get more involved, such as pensions, statutory leave, part-timers, variable pay, or different working patterns. At that point, having someone who lives and breathes payroll can make life much simpler.

Outsourcing doesn’t replace your role entirely - you still set pay decisions, approve changes and manage your team. It simply gives you someone who keeps the process clean, on time and compliant.

FAQ quickfire round

How long should payroll take each month?

When payroll is well organised, it shouldn’t dominate your time or interrupt your focus. Problems tend to arise when information is scattered, changes aren’t captured clearly, or payroll is left until the last minute.

Payroll becomes time-consuming when:

• Pay changes aren’t logged consistently

• Pension or tax details are out of date

• Payroll is squeezed in around other priorities

• Errors need correcting after the fact

With a clear process and the right setup, payroll becomes predictable and routine.

What happens if I pay someone late?

Late payroll creates more than frustration. It can affect morale, trust, and, if it’s significantly delayed, it can lead to HMRC penalties. Even a short delay can ripple into people’s personal finances, so consistency matters.

Do I need to enrol staff in a pension?

If they meet the criteria for auto-enrolment, yes. Most employees qualify once they reach the relevant earnings threshold. It’s a legal requirement, and payroll software usually handles the assessments automatically.

How do bonuses and commissions work in payroll?

They’re treated as part of taxable earnings. The main challenge is timing and accuracy: making sure the amount is approved, recorded properly, and paid in the right month. 

What if someone joins or leaves mid-month?

Payroll can handle this easily, but it needs clear information. Start dates, final working days, holiday balances, and any outstanding pay need to be logged properly. Most issues happen when the handover is rushed.

Can I correct a payroll mistake after it’s run?

Yes, but corrections create more admin than getting it right the first time. You can fix errors on the next payroll or by issuing an additional payment, depending on the mistake. The key is spotting it early.

Do I need an accountant to run payroll?

Not necessarily. Many founders run their own payroll in the early stages. But as soon as the team grows or the rules get more involved, having a specialist prevents headaches and keeps compliance in check.

Support with payroll

Payroll doesn’t need to be something you dread each month. With a few clear processes and the right routine, it can become one of the simpler parts of running a business.

If you’re at the stage where payroll feels messy, time-consuming, or harder than it should be, you’re not alone. Many reach a point where they just want it to run cleanly so they can get back to the work that actually moves the business forward.

That’s the space we work in. Keeping things steady. Making sure the small details are handled properly. Giving you one less spinning plate to worry about.

If you ever want a second pair of eyes, or someone to take payroll off your list entirely, we’re here when you need us.