What is a shadow payroll and who is actually paid by it?
Nobody is paid by it. The employee keeps receiving pay from the home payroll that has always paid them. The shadow payroll is a registration in the host country that reports the same compensation and remits the tax and contributions the host country is owed on work performed inside its borders. Money moves in the home country; the obligation is discharged in the host country. That split is the whole point of the arrangement, and it is why the two records have to be reconciled to each other rather than added together.
Do we need a shadow payroll if the employee stays on home payroll?
Staying on the home payroll settles who pays the employee. It does not settle where withholding is due. If the host country taxes the compensation from the first day of work, or from the day a threshold is crossed, it expects that withholding through a host registration, and the home payroll cannot discharge it. A shadow payroll exists precisely for that case: the employment contract, the bank transfer and the pay slip stay where they were, and reporting is added where the work actually happened.
Does a shadow payroll mean the employee is taxed twice?
It means the same compensation is reported twice, in two systems, which is not the same thing. The host country taxes the workdays spent there. The home country either exempts that income or gives credit for the host tax under its own rules or a treaty. Double taxation comes from failing to claim that relief, or from reporting figures on the two payrolls that do not reconcile, rather than from the shadow payroll itself. The reconciliation is the document that makes the relief claim defensible.
Who runs the shadow payroll, the home or the host company?
Whoever is registered in the host country, which is usually the host entity or a local provider acting for it. The practical difficulty is not who runs it but who feeds it. The compensation data originates in the home payroll, and a host payroll cannot report what it is not told: equity, allowances, bonus paid after the assignment ends, and the equalisation entries all sit in home-country records. Agreeing the data feed before the first remittance falls due avoids re-filing later.
What goes wrong when a shadow payroll is set up late?
The compensation was taxable in the host country from the day the trigger was met, so a late registration does not shorten the period that has to be reported. The months already elapsed are remitted and reported after the fact, with interest and penalty exposure that depends on the host country's own rules. The harder problem is data. Pay slips, travel records and allowance detail for a period nobody was tracking have to be reconstructed from whatever happens to still exist.
How is a shadow payroll reconciled with the home payroll at year end?
Line by line, on the same compensation. The reconciliation shows what the home payroll paid, which elements the host country treats as taxable there, the workday split that supports the apportionment, and the tax remitted on each side. Where the assignment is equalised, the hypothetical deduction and any gross-up also have to appear, because they change the reported figure without changing what the employee received. That single schedule supports both filings and answers the first question either authority asks.
Is double taxation illegal?
It is legal. Two countries can each have a valid claim on the same income — one because the income arose there, the other because you live there — and nothing prohibits both from exercising it. What exists instead is relief: tax treaties allocate the claim, and domestic law gives a credit for foreign tax paid. The relief is not automatic, though. It is claimed on a return, and unclaimed relief is simply lost. See how double taxation is relieved.
What is a totalization agreement and how do I use one?
A social security agreement that stops you contributing to two systems for the same work, and lets periods in both count towards benefit eligibility in either. Which system you stay in depends on the agreement's rules for your situation — a seconded employee usually remains in the home system for a set period, a locally hired one usually joins the host system. You evidence it with a certificate of coverage obtained before or shortly after the assignment starts. See certificates of coverage.
