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Cost comparison · UK small businesses

Running payroll yourself vs outsourcing it: the honest maths

Plenty of small employers run their own payroll, and some genuinely should. Here's what DIY actually costs in hours, software and risk — and an honest view of when each side wins.

What DIY actually involves

The job behind "it's just a few payslips"

Every pay periodAnd alongside it
Collect hours/changes · calculate gross-to-net (tax codes, NI, student loans) · produce payslips · file the FPS with HMRC on or before payday · submit pension contributions · pay HMRC by the 22nd Starters & leavers (P45s) · statutory sick/parental pay when it happens · tax-code notices · year-end P60s · keeping up when rates and thresholds change every April — and sometimes mid-year

For a typical small team this runs to 2–5 hours a month once you're practised — more in April, more whenever something unusual happens.

Six staff? That's from £65/mo on Essentials — or £120/mo on Managed if you'd rather we run the pension end to end too, with a portal and a named contact. Your choice, not a forced jump.

Side by side

A 5-person team, compared honestly

 DIYOutsourced to us
Cash cost / month£0–£30 (HMRC's free Basic PAYE Tools works, but produces no payslips and doesn't run your pension — paid software fixes that for £10–£30)£35 + £5/payslip = £60 (5 staff, monthly)
Your time / month2–5 hours of the owner's or a senior person's time~10 minutes: send changes, approve the run
Who carries the deadlineYou — every payday, every month, on holiday or notWe do — filing on or before payday is our job
If it goes wrongLate FPS penalties start at £100/month for small employers; pension and tax-code errors compound quietlyChecked twice, filed once — and a specialist to fix anything fast
The real comparisonIf your time is worth even £30/hour, DIY's "saving" costs £60–£150/month in attention — before any penalty, and before the April scramble
The honest answer

Sometimes DIY genuinely is the right call.

We'd rather tell you that than win a client who shouldn't have switched. If the panel opposite describes you, modern payroll software is good, and you'll likely be fine running it yourself — come back when the team grows.

If it doesn't describe you, the question isn't really "can I do payroll?" — it's "is payroll the best use of the hours?"

DIY makes sense when…

  • It's just you — a director-only payroll with one identical payslip a month.
  • Nothing changes: no starters, leavers, overtime, sick pay or bonuses.
  • You actually enjoy it and will keep up with the April changes.
  • Cash is genuinely tighter than time right now.

Two or more employees, any churn, or statutory pay in the mix? The maths flips quickly — see your exact figure.

Get the hours back.

Tell us your headcount and we'll quote a fixed monthly fee — usually less than the time DIY was quietly costing you.

Get my fixed quote
Free 20-minute call Fixed fees, published No lock-in Early tax-year rates available