What are tax equalization and tax protection?
Tax equalization and tax protection are two methods companies use to settle the tax consequences of an international assignment between the company and the assignee. Both models rely on the same reference figure: the hypothetical tax (hypotax) – the amount the assignee would have paid had they stayed in their home country. Per PwC's Worldwide Tax Summaries, a tax equalization plan is designed so that "the employee's tax burden remains the same as if they had remained in the home country" – if actual taxes exceed the hypotax, the employer reimburses the excess; if they fall short, the employer keeps the difference. A tax protection plan, per the same source, works asymmetrically: "the company reimburses the employee for actual taxes paid in excess of the amount the individual would have paid in their home country […]. If the actual tax liabilities are less than the hypothetical home country tax, the employee is allowed to keep the difference" – the employer covers only the downside, while any tax benefit in the host country stays with the assignee.
German legal commentary Haufe independently confirms the same mechanics: under tax equalization, "the employee is meant to bear the same amount of tax, regardless of the tax rates applicable in the host country, that would have been payable had they remained in the home country" (own translation). Under tax protection, "the employer only compensates for any tax disadvantages in the host country" – a tax benefit "does not accrue to the employer, but to the employee." Which method applies is set out, per Haufe, in the company's internal assignment policy or the individual assignment contract.
How is the hypothetical tax calculated?
Both models require first establishing the hypothetical tax – per PwC, "generally determined on the base salary and other remuneration as if the employee had remained in the home country." Per Haufe, the hypotax amount is often withheld on an ongoing basis through payroll, but the final amount is "regularly only determined after the end of the calendar year, so that changes to the amount of wages are possible during the tax assessment process" (own translation).
How companies actually choose the calculation basis is shown by the KPMG 2023 Global Assignment Policies and Practices (GAPP) Survey: 48 percent of surveyed companies use home-location residence as the basis, 46 percent use the home-location work location if it differs from residence. On which income types feed into the hypotax, KPMG observes "an increase in organizations who do not include personal income under their tax equalization policy" – the survey reports that 73 to 76 percent of companies currently exclude personal income (such as investment income) from the calculation.
Tax equalization in detail
Under tax equalization, the employer bears the full difference in both directions, per PwC: "If the individual's actual taxes are greater than they would have incurred in the home country, the employer reimburses the excess, and if the actual taxes are less, the employer retains the excess." The assignee therefore always bears, economically, exactly the hypotax amount – regardless of whether the host country taxes higher or lower than the home country. Any tax benefit from a more favorable host-country system stays with the company, not the individual. Per the KPMG 2023 GAPP Survey, this is by far the dominant model: 84 percent of surveyed companies apply a global tax equalization policy covering all assignments.
In practice, equalization is increasingly extended to variable compensation as well. Per KPMG, 52 percent of companies apply equalization to equity compensation for the full term of the relevant vesting award, regardless of actual assignment duration; 28 percent limit equalization on equity to the year of repatriation.
Tax protection in detail
Tax protection works asymmetrically: per PwC, the employer only covers the excess cost when actual tax exceeds the hypotax; if actual tax is lower, "the employee is allowed to keep the difference." The assignee therefore never bears more than the hypotax, but keeps the upside of a more favorable host-country tax outcome. Per the KPMG 2023 GAPP Survey, tax protection as a sole, global policy is markedly less common than tax equalization, at just 5 percent – in practice it is applied more often selectively to specific compensation components or assignment types rather than as a full replacement for equalization.
Equalization vs. protection compared
| Feature | Tax equalization | Tax protection |
|---|---|---|
| Goal | Complete tax neutrality – neither advantage nor disadvantage for the assignee | Protection against higher tax; a benefit from lower tax stays with the assignee |
| Who covers the excess cost of higher host-country tax? | Employer | Employer |
| Who keeps the benefit of lower host-country tax? | Employer | Assignee |
| Prevalence as a global policy (KPMG GAPP 2023) | 84 percent | 5 percent |
| Typical basis for the hypotax calculation | Home-location residence (48%) or home-location work location (46%), per KPMG | Same calculation method as equalization |
What this means for companies
For HR and global mobility teams, what matters is which model is documented in the assignment contract or the company-wide assignment policy – per KPMG, both models can apply in parallel within the same company for different employee groups or compensation components, for example equalization on base salary alongside different treatment for equity or personal income. This is a purely contractual and payroll construct, not a tax-law reporting requirement, and it operates independently of questions such as the 183-day rule or the economic employer, which must be assessed separately. For documentation, this means which method applies per assignee, which income components are included, and how the hypotax basis is defined all need to be tracked clearly. Tools like premote help track contract type and the relevant assignment data per international assignment in a structured way – as a basis for clean reporting and compliance processes, not as a substitute for individual tax assessment by a tax advisor or in-house mobility tax specialist.
FAQ
What is the difference between tax equalization and tax protection?
Under tax equalization, the employer bears the difference between actual tax and hypotax in both directions – the assignee always pays, economically, exactly the hypotax. Under tax protection, the employer only covers the excess cost; the assignee keeps any benefit from lower host-country tax.
Which model is more common in practice?
Per the KPMG 2023 GAPP Survey, 84 percent of surveyed companies apply tax equalization as a global policy, compared to just 5 percent for tax protection.
What is the hypotax?
The hypothetical tax (hypotax) is the estimated tax amount the assignee would have paid in the home country. It is the calculation basis for both models, but not a real tax liability.
Does personal income such as investment income feed into the hypotax?
Per KPMG, 73 to 76 percent of companies currently exclude personal income from the hypotax calculation – a trend that has been increasing.
Does the same model also apply to equity compensation?
Not automatically. Per KPMG, 52 percent of companies apply equalization to equity compensation for the full vesting term, while 28 percent limit it to the repatriation year – treatment is often set out separately in the policy.
The information provided on this website does not constitute legal advice and is not intended to address any legal issues or problems that may arise in individual cases. The information on this website is of a general nature and is provided for informational purposes only. If you need legal advice for your individual situation, you should seek the advice of a qualified attorney.