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.
How does the treaty tie-breaker work when both countries say I am resident?
As a sequence, stopping at the first test that gives an answer: where you have a permanent home available; if in both or neither, where your centre of vital interests is; then habitual abode; then nationality; and if all of those tie, the two tax authorities decide by agreement. It is evidential rather than elective — you do not choose your treaty residence, you demonstrate it, which makes the record of homes, family and time the substance of the claim. See tie-breaking dual residency.
What is double tax relief and how is it given?
Three mechanisms, and which one you get depends on your residence country's law and the treaty. Exemption leaves the foreign income out of the residence-country base. Credit taxes it and then subtracts the foreign tax, capped at the residence-country tax on that income. Deduction merely reduces taxable income by the foreign tax, and is usually the weakest. Canada and the United States lead with credit; several treaties give exemption for specific income types. See claiming the credit.
