What is a qualified domestic minimum top-up tax?
It is a top-up charge imposed by the jurisdiction where low-taxed profit arose, computed in line with the global minimum tax rules, so that the extra tax is paid there instead of being collected by another country higher up the group. The point of it is destination rather than amount: the group pays a broadly comparable sum either way, but the revenue stays where the profit was earned. For a group this changes who it files with, which figures a local finance team needs to produce, and which administration will ask questions about the computation behind them.
Why would a country charge a top-up on its own companies?
Because the alternative is that another country collects the money. Under the minimum tax rules, profit taxed below the agreed floor attracts a top-up somewhere, and if the jurisdiction of that profit does not charge it, a jurisdiction further up the ownership chain will. A country that has deliberately set a low rate, or granted incentives, therefore faces a choice between losing the revenue to a foreign treasury and taking it itself. A local charge is the second option. It also gives that country control of the computation and of the audit of it, rather than having its own tax base examined through another state's filing.
Does a domestic top-up stop our parent being charged?
That is its purpose, and it works to the extent the charge is recognised. The rules give priority to a conforming local charge, so a top-up properly paid in the jurisdiction of the low-taxed profit reduces to nothing what is collected higher up the group on that profit. The caution is that the relief depends on the local charge meeting the conditions the rules set, and on it being computed and paid on the same profit. A local charge that falls short, or that is computed on a different base, can leave a residual amount to be collected elsewhere — which is why the two computations are reconciled rather than assumed to agree.
What makes a domestic top-up tax qualified?
Conformity with the minimum tax rules, tested against conditions those rules set out rather than against the country's own description of its charge. In broad terms the local charge has to compute the shortfall on the same adjusted accounting basis and to the same minimum level as the mechanism it substitutes for, and to be administered consistently with it. The label matters because it is what gives other countries a basis to stand down. A group therefore cannot take a domestic charge at face value: it needs to know whether that charge is recognised for these purposes, because the answer decides whether a parent jurisdiction still has something to collect.
Do we have to run two computations for the same jurisdiction?
In effect, often yes. The local top-up is computed on the minimum tax rules' adjusted accounting basis, while the ordinary corporate return in the same jurisdiction is computed under that country's own tax law. They start from different figures and neither substitutes for the other, so both are prepared and the relationship between them explained. The workable approach is to treat the return and the top-up computation as two outputs from one dataset: local statutory accounts and group consolidation figures assembled once, then used for both. Groups that run them as unrelated projects reconcile the same differences twice over, every year.
Does a domestic top-up cancel out our tax incentive?
Not cancel, but it can reduce what the incentive delivers. An incentive works by lowering tax on profit in a jurisdiction, and the minimum tax rules test the tax actually borne on that profit there. If the incentive takes the effective rate below the floor, a top-up arises on the difference — and where the jurisdiction operates its own local charge, that top-up is paid to the same government that granted the relief. Whether a particular incentive survives depends on its form, because the rules treat some kinds of support differently from others. It is worth modelling before an incentive is built into a business case rather than after.
Which country do I pay tax to first?
Generally the source country — where the income arises — taxes first, often by withholding before you receive it. Your country of residence then taxes the same income and credits what the source country took. That order is why timing matters: a residence-country return filed before the source-country tax is settled has nothing to credit yet. Getting the sequence right is most of the work. See international tax planning.
Do I have to file in both countries?
Frequently yes, and the two filings do different jobs. The country where the income arises taxes it at source; the country where you are resident taxes your worldwide income and then gives credit for the tax already paid. Filing only one side is what leaves relief unclaimed — the credit has to be asked for on a return. We prepare both sides so the numbers agree. See dual filing.
