How to Process Your First Payroll Run: A Step-by-Step Guide

Processing your first payroll run feels intimidating beforehand but is just a series of logical steps. Once you've done it, each subsequent run becomes routine.

This guide walks you through processing your first payroll run step by step, without jargon.

Before you start: what you actually need

Before processing your first payslip, gather these essentials:

Employer registration — HMRC's employer registration portal (UK) or EIN from the IRS (USA). Keep your employer reference number accessible.

Employee details — Full name, address, tax ID (National Insurance number in UK, SSN in US), tax code, and verified bank details. One wrong digit in a sort code and someone else gets your money.

A payroll calendar — Decide your pay frequency and exact dates for each period. Consistency matters — employees need to know when money lands, and you need to know your filing deadline (usually payday itself).

Salary or hourly rates — From employment contracts, not assumptions.

Pension details — If you're auto-enrolling, have your scheme details on hand.

Missing any of these? Sort them out first. Incomplete information becomes errors, and errors become frustrated employees.

Collect data and calculate the numbers

Step 1: Confirm your pay period

If you pay monthly, your first run might cover 1 April to 30 April, with payment on the 30th. If weekly, Monday to Sunday with payment the following Friday. Document the dates and when employees will be paid.

Step 2: Gather variable pay data

For salaried employees, gross pay is constant. For hourly workers, overtime, commission, or bonuses, collect that data first. This includes timesheets (manager-approved), overtime records, commissions, and any expense reimbursements you're processing through payroll. Collect all data by your processing deadline.

Steps 3–6: Calculate gross pay and apply deductions

Gross pay: Salaried employees divide annual salary by the number of pay periods. Hourly employees multiply hours by the hourly rate, plus overtime. Add bonuses, commissions, or other taxable allowances.
Income tax: Using the employee's tax code, calculate taxable pay (gross minus the tax-free amount) and apply the relevant rate(s).
Mandatory deductions: National Insurance, Social Security, or equivalent; student loan repayments; court orders.
Voluntary deductions: Pension contributions, salary sacrifice schemes, union dues — all require written authorisation.

This is where integrated payroll and HR software earns its keep. Tax calculations are error-prone to do manually. Use your tax authority's calculators (gov.uk for HMRC, irs.gov for the IRS) if handling this by hand.

Step 7: Add employer contributions

Some costs are yours alone: employer National Insurance, employer pension contributions, and apprenticeship levy (if applicable). Calculate and record separately — they affect your total payroll cost.

Step 8: Calculate net pay

Net pay = Gross − Income tax − Employee social contributions − Other deductions

That's what lands in their account. Sanity-check it against their salary.

Pay your employees and report to authorities

Steps 9–10: Generate payslips and make payment

Every employee gets a payslip showing employee name, pay period dates, gross pay, each deduction listed separately, net pay, and year-to-date totals. Digital payslips are standard now and easier to store.

Process payments via bank transfer, individually or as a batch. Verify bank details are correct, allow enough lead time for processing, and include a clear reference so employees can identify the payment.

Step 11: File with your tax authority

Report to HMRC (UK) or equivalent after processing. Most jurisdictions require this on or before payday, including each employee's gross pay, tax deducted, social contributions, and any starters or leavers. Late filing attracts penalties.

What Is RTI and How Does Real Time Information Payroll Work? explains the UK process. In the US, Understanding Federal and State Payroll Taxes covers the equivalent. Payroll software that files electronically removes deadline risk — and the tedium of transcribing numbers into a government portal.

Step 12: Reconcile and record

Reconcile: Total net payments plus deductions paid to third parties should equal total gross pay plus employer contributions.
Record the payroll journal: When payroll and accounting are integrated, the journal entry is created automatically. If not, you'll record this manually.
Store records securely: Keep copies for the required retention period (6 years UK, 4 years US).

Making payroll routine

The first run takes longest. By your second or third, it feels routine.

Going forward:

Set calendar reminders for key payroll dates
Create a checklist so nothing gets missed
Review your process after the first few runs. If you're managing multiple pay frequencies or need better HR software, that's worth investing in now.

The goal is a smooth process every period without surprises.

Frequently Asked Questions

What happens if I get my first payroll wrong? File a correction with your tax authority. Errors happen, especially first time. Catch them quickly and notify HMRC (or equivalent) promptly. Payroll software and checklists prevent most errors.

Can I process payroll myself or do I need a payroll bureau? You can do it yourself with a small number of employees. A payroll bureau costs roughly £10–25 per employee per month. If you have time and good software, doing it in-house saves that cost.

How much notice do employees need before their first payday? No legal minimum in the UK, but tell them during onboarding so they can plan accordingly.

What if employees are paid at different frequencies? You can have multiple pay frequencies in the same run. Make sure your software supports it and your payroll calendar is clear.

Do I need to file payroll information every month? In the UK, yes — RTI requires submission on or before each payday. In the US, it depends on your state. Check your local requirements in advance.

What if an employee doesn't provide bank details? You can't pay them without correct bank details. Never process payroll without verified banking information.

Should I use a spreadsheet or payroll software? A spreadsheet works for one or two employees but doesn't scale well. Payroll software (£5–50/month) handles calculations, filing, and record-keeping automatically. Worth it from employee two onwards.