What is shadow payroll?

A practical guide for mobility, tax and payroll teams.

A shadow payroll reports an employee's pay in a country where they work, even though they are paid somewhere else. It lets the employer work out and pay the right local tax and social security, without paying the employee twice.

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What is shadow payroll?

A shadow payroll is a payroll that doesn't pay anyone. The employee keeps being paid through their normal payroll, usually in their home country. The shadow payroll copies that pay into the country where they are working, so the local tax and social security can be worked out, paid and reported.

It matters because pay and tax don't always sit in the same place. An employee can be paid in the UK while owing tax in Germany. The shadow payroll is how the German side gets the right numbers.

A shadow payroll usually covers:

  • Salary and bonuses paid through the home payroll

  • Benefits such as housing, school fees and cars

  • Assignment allowances and relocation costs

  • Any tax paid on the employee's behalf, which is often taxable itself

That last point is where most of the work is. When an employer pays an employee's tax, that payment counts as income, which creates more tax. Working this out is called a gross-up, and getting it right each month is the hardest part of most shadow payrolls.

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When you need one

It's not just assignments any more.

You may need a shadow payroll whenever someone works in a country where they aren't on the local payroll. It depends on the country, the facts and any tax treaty, so check with your adviser.

Long-term assignments

The employee usually becomes taxable where they work

Short-term assignments

Tax can apply from day one, depending on local rules

Business travel

Frequent trips can add up to a taxable presence

Project work

Staff sent to deliver a project may owe tax where it happens

Remote working abroad

Long spells working abroad can create local tax

Commuters

Living in one country and working in another can mean tax in both

Check these before you run one

Most shadow payroll problems start before the first calculation. Work through these with your tax adviser and payroll provider, then write the answers down as a tax position for each employee and country.

The company

  • Could the work create a permanent establishment?
  • Does the employer need to register locally?
  • How will costs be recharged between entities?

The employee

  • Are they tax resident, and at what rates?
  • Does a tax treaty change where they pay tax?
  • Do they qualify for an expat regime or relief?

Social security

  • Do they have an A1 or certificate of coverage?
  • If not, which country's system applies?
  • Are contributions due in more than one country?

The policy

  • Is the employee tax equalised or tax protected?
  • Which payments does the company cover?
  • Who signs off each monthly run?

Why the numbers go wrong

Shadow payroll figures usually go wrong for ordinary reasons, not because the tax rules are unclear.

  • Data arrives late or incomplete. Pay, benefits and allowances come from different systems and providers, in different formats.
  • The same numbers are rebuilt by hand. Spreadsheets get copied each month, and small differences creep in.
  • Gross-ups are hard to repeat. The same inputs should always give the same answer, but manual methods often don't.
  • Rules change. Tax rates, thresholds and relief change every year, and not every spreadsheet keeps up.
  • Knowledge sits with one person. When they leave or are away, the process stalls.

The cost can be large. Employment taxes and social security can add a big share on top of an employee's pay. Getting it wrong means overpaying tax, or underpaying and facing penalties and corrections later.

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Compare

Spreadsheets or a platform?

Spreadsheets can work for a handful of employees. As numbers grow, a platform built for the calculations is easier to scale and to check.

Spreadsheets The usual way
RECOMMENDED Calculation platform Built for the job
Setup
Quick to start
Takes time to set up once
Monthly effort
Rebuilt by hand each run
Same rules applied each run
Consistency
Varies by person and file
Same inputs give the same answer
Checking the numbers
Hard to trace
Workings shown for each figure
Rule changes
Updated file by file
Updated in one place
Audit trail
Emails and file versions
Logged in the system
Best for
A few employees, one or two countries
Growing numbers, several countries
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Best practice

Six ways to get it right

Small habits that stop most shadow payroll errors before they start.

01

Set the tax position first

Agree the treatment for each employee and country before the first run.

02

Write a clear policy

Say who pays what, and whether employees are tax equalised or protected.

03

Fix the data at the start

Agree one format and one deadline for pay, benefits and allowances.

04

Track travel and working days

Many tax and social security rules depend on days spent in each country.

05

Use one method every month

Consistent calculations make errors easy to spot and explain.

06

Keep the workings

Record how each number was reached, so payroll, finance and auditors can follow it.

Where Certino fits

Certino calculates your shadow payroll figures and gives them to your payroll provider, ready to process. We don't run payroll, and we don't replace your tax adviser.

The Certino platform

Your team runs the calculations on Certino.

  • Hypo tax, gross-ups and shadow payroll on one platform
  • Workings shown for every number
  • Payroll-ready figures in the format your provider needs

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Managed service

Our tax specialists run it for you.

  • We collect and check the data every month
  • We run the calculations and flag anything odd
  • You approve, and we send the figures to your provider

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What is the difference between shadow payroll and split payroll?
A shadow payroll reports pay for tax purposes but pays the employee nothing. A split payroll actually pays the employee from more than one country.
Does the employee get paid through the shadow payroll?

No. The employee is paid through their normal payroll. The shadow payroll only reports that pay, so local tax and social security can be worked out.

Who is responsible for running a shadow payroll?

Usually the employer's local entity or payroll provider in the host country. Mobility, tax and payroll teams often share the work.

How often does a shadow payroll run?

Usually monthly, in line with the local payroll cycle. Some countries allow less frequent reporting.

What is a gross-up?

When an employer pays an employee's tax, that payment counts as income and is taxed too. A gross-up works out the total so the employee ends up with the agreed net amount.

Do I still need a tax adviser?
Yes. Your adviser sets the tax position and advises on the rules. Certino applies that position and does the calculations each month.

Get your shadow payroll numbers right, every month

Run it on the Certino platform, or let our specialists do it for you.

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