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Legal

Running payroll and HR for several clients

Many different calendars, many deadlines, and data about people who are not yours.

Updated on 13/08/2026

Running payroll and HR for thirty companies is not doing the same thing thirty times: it is doing the same thing with thirty different calendars, thirty contacts and thirty ways of sending you things late. And with data about people who belong neither to you nor to your client: it is theirs.

What repeats every month

WhatWho it depends onWhat happens if it is late
Payroll variablesThe clientThe whole chain slips
Hires and leaversThe client, with legal deadlinesThe only thing that tolerates no delay
New employee documentationThe worker, via the clientYou can start without it, but better not
Contract and amendment signaturesThe workerIt blocks the hire if it does not arrive

Important

Hires tolerate no margin and arrive latest, because the client tells you when the person is already working. A recurring request with reminders does not fix it entirely, but it turns "I found out on the 20th" into "I asked on the 1st and it is on record".

The data you handle is not your client's

Payslips, identity documents, sometimes health data. They belong to your client's workers, people who never engaged you. One team per client is not internal tidiness: it is what stops one company's adviser seeing another's payroll.

Watch out

When a client leaves, return their file and apply retention to the rest. Keeping the payslips of a former client's workers, with no obligation justifying it, is pure risk.

Worth knowing

A scheduled monthly request with reminders at days 3, 7 and 12 turns the first week of each month from a phone campaign into four calls.

Can I give the client access to their own?

Yes, scoped to their company.

What about the workers' signatures?

They sign from their phones; they need no account and need not know you.

How long do I keep it after a client leaves?

Whatever your professional and employment rules require; check.

A real case

The situation

A payroll bureau with 34 clients spends the first week of each month chasing variables.

What you do

  1. Schedules the monthly request with reminders
  2. One team per client

What you get

The first week goes from thirty calls to four, and no adviser sees another client's payroll.

The situation

Each company sends its returns through a different channel.

What you do

  1. Agrees a single delivery channel

What you get

Deliveries stop getting lost.

The situation

An onboarding arrives on the day the person starts.

What you do

  1. Requests documentation in advance

What you get

Onboarding is prepared before day one.

The situation

A client asks what they are missing every month.

What you do

  1. Shows them their own outstanding list

What you get

They answer for themselves.

The situation

A worker's documentation expires.

What you do

  1. Records expiries per person

What you get

The warning arrives before it bites.

The situation

Every close chases the same things.

What you do

  1. Reuses the process from one month to the next

What you get

Follow-up stops being rebuilt.

This article answers

  • payroll bureau client documentation
  • hires and leavers for several clients
  • client payroll document management
  • employment deadlines across companies