It is designed so that the assignment does not change it. The employer deducts a hypothetical home-country tax from your pay, calculated broadly as though you had never moved, and then bears the actual home and host tax on the assignment income. You feel the hypothetical deduction, not the real tax bills. If the host country is expensive the employer absorbs the difference; if it is cheap, the saving belongs to the employer rather than to you. The effect is a flat outcome, deliberately.
Tax equalisation — meaning in cross-border tax
What Tax equalisation means in practice — the meaning first, then the consequence.
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A policy under which the employer bears the actual host and home tax and deducts a hypothetical home tax from the employee.
What it changes
What decides these terms is presence and paperwork rather than intention. The exemption exists; proving the conditions were met is the work.

Where cross-border trouble starts
A term that carries a bright-line test in one country often carries a facts-and-circumstances test in the other. That difference decides how a file is built long before it decides the tax, because one of them can be answered from a document and the other has to be evidenced.
Where you will actually see it
Tax equalisation matters in the contexts below. Each of those pages says what it does there, and what it costs to handle.
What it means for your own file
If Tax equalisation is in a notice you have received, bring the notice. The definition matters far less than what the sender is actually asking for. If that describes your position, the next step is a short call — not a form.
We keep these entries short and mechanism-level on purpose: enough to recognise the issue in your own paperwork, and not so much that the page reads as advice about a situation we have not seen.
Reviewed for accuracy for the 2025 and 2026 filing seasons by Udit Gupta, International Tax, Cross-Border Tax & Transfer Pricing Expert, Legal Quotient Consultants. General guidance only. Your own facts decide the answer, so bring them to a call before relying on this.
Equalisation tax, in practice
The subject here is tax equalisation, which is what people mean when they search for equalisation tax. This page covers who it applies to, the filings it produces, and the fixed fee agreed before work begins.
People also search for: tax on a tax · form 5713.
Cross-border tax case studies
Employee disputed the hypothetical deduction shown on his pay record
An assignee questioned a deduction that matched no tax he could find on any assessment. We traced the calculation the employer had applied, set out which compensation it was based on and which home-country assumptions had been used, and compared both to the policy wording. The engagement produced a written explanation of the deduction, a correction for the period where the assumptions had not matched the policy, and a settlement statement the employee could reconcile against his own filings in both countries.
Personal investment income drawn into an equalised assignment by mistake
An employer had been bearing tax on income the policy did not cover, because the host return reported assignment pay and the employee's own portfolio together. We separated the liability by income source, recalculated the employer's share on the compensation alone, and identified the portion that belonged to the employee under the policy. The engagement produced a source-by-source allocation for the years in question, an amended settlement, and a policy note stating which income the employer will and will not equalise.
Departure before the equalisation settlement had been calculated
An assignee resigned with the host return still unfiled and the settlement outstanding, and both sides assumed the other had lost the argument. We identified what remained to be filed, who was contractually obliged to bear which liability, and where the outstanding refund would land. The engagement produced the filed returns, a settlement calculation both parties could check line by line, and a repayment arrangement recorded in writing rather than left to a leaver clause nobody had read.
Host country refund paid to the employee instead of the employer
The employer had borne the host tax and the refund arrived in the employee's account. The policy required it back, the employee had already spent it, and neither party had raised the point when the return was filed. We reconstructed the composition of the refund, showing which part related to tax the employer had paid and which to the employee's own credits, and produced a figure neither side disputed. The engagement produced that allocation and a changed banking instruction for later filings.
Building an equalisation calculation for a first outbound assignment
An employer sending its first employee abroad had a policy document and no method. We set out how the hypothetical tax would be calculated, which compensation elements were in scope, how the host and home filings would be sequenced, and how the year-end settlement would be evidenced. The engagement produced a worked calculation for the assignee, a data schedule the payroll team completes each period, and a reconciliation template that ties the policy wording to what the two returns actually show.
Assignees on one policy settled differently because of home circumstances
Employees sent to the same host country under the same policy received materially different settlements, and the employer suspected an error. There was none. The hypothetical calculation follows each employee's own home-country position, so filing status, dependants and home-country reliefs move the deduction even where the salary is identical. We documented the drivers in each case. The engagement produced a comparison the employer could show its assignees, and an explanatory note now issued with every assignment letter.
Withholding Reduced by the Right Article
Dividends, interest and royalties each have their own article and their own rate, and the payer applies whichever it is satisfied of. Establishing entitlement before payment is what secures the lower rate at source.
Read how this one runsUS Estate Tax on Assets a Canadian Did Not Know Were Exposed
US shares and US real estate sit inside the US estate tax net regardless of where the owner lives. The treaty provides relief that is proportionate rather than automatic, and the calculation depends on the worldwide estate.
Read how this one runsAll case studies — every published engagement in one place.
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Also asked about Tax equalisation
The employer, for the tax the policy covers, and that boundary is where most disputes start. Assignment compensation is normally equalised. Personal income has nothing to do with the assignment — investments, rental income, a spouse's earnings — and is usually left with the employee, even though it may sit on the same host-country return and may be pushed into a higher band by the assignment income. Read the policy for what it covers before assuming a bill belongs to someone else.
Because the hypothetical deduction is not a tax. Nothing is remitted to an authority under that line; it is an internal charge standing in for the home tax you would have paid had you stayed. The actual tax is paid separately by the employer, in both countries, under their own rules. Two consequences follow. The deduction appears on your pay record but on no assessment, and the final settlement after both returns are filed can move it up or down.
Once both countries' returns are filed and the real liabilities are known, the employer compares what you actually bore through hypothetical deductions with what the policy says you should have borne. The difference is settled one way or the other. Because it waits on the later of the two filings, and on any refund the employer is entitled to recover, it often arrives well after the year has closed. That is also why leaving the company before settlement needs to be dealt with in writing.
No. The obligation to file is yours in both countries, whatever the policy says about who pays. What equalisation usually changes is who prepares the returns, who pays for them, and who receives the refunds. Refunds are the point worth checking. Where the employer bore the tax, the policy will normally require any refund of it to be passed back, and a refund banked and spent is a difficult conversation. Read that clause before you sign anything that commits it.
They answer different questions. Equalisation fixes your outcome: you bear a hypothetical home tax, never see the real bills, and any windfall from a lightly taxed host goes to the employer. Protection leaves you exposed to the real position and then reimburses you only if the assignment made you worse off, so a lightly taxed host can leave you better off. Equalisation gives predictability and treats a whole population consistently. Protection can pay more, and can pay nothing at all.
Both countries have routes back, and using one before they contact you is what preserves the relief. On the US side there are procedures aimed at taxpayers whose failure was not wilful, including one designed for people living outside the country, and separate procedures for late account reports and information returns alone. Canada has its voluntary disclosures programme and taxpayer relief for penalties and interest. Filing quietly and hoping is the one approach with no protection attached to it. See catch-up filing.
Usually the country you are physically in, because employment income is generally sourced where the work is done, with your residence country taxing it as well if you are resident there and giving credit. Three things follow: your employer may acquire withholding and social security obligations where you sit, a treaty tie-breaker may be needed if both countries call you resident, and a short trip that becomes a long stay can cross a residence threshold nobody was watching. See remote workers and digital nomads.



