Why cannot my unused credit cover tax in another category?
Because the limit is computed separately for each category. The credit for a category cannot exceed the domestic tax on that category foreign income, and the calculation is run category by category, so credit in one does not reach a shortfall in another. Carryover behaves the same way: an unused amount stays inside the category it arose in, and can only be used against later tax on income of that category. The practical effect is that a filer can hold substantial unused credit and still owe domestic tax on other foreign income in the same year. That is not an error in the return; it is the mechanism working as designed.
Which basket does foreign dividend withholding fall into?
Dividends, interest, royalties and similar returns on capital are grouped with other passive income, separately from earnings from employment or from an active business. So withholding on a foreign portfolio lands in the passive basket and can be relieved only against domestic tax on passive foreign income. This is why a filer with a large salary abroad and a modest portfolio can find the salary credit ample and the dividend withholding stranded: the two never meet. Rental income, gains on investments and fund distributions generally sit on the same side of the line, so the investment part of a return tends to stand or fall together.
Do both countries group income into the same baskets?
No. Baskets are a feature of one country own credit mechanism, not something the two systems agree on, and the other country will have its own way of limiting relief for tax paid here. Assuming symmetry is a common mistake in planning. It matters most where the same income is characterised differently on each side, such as a distribution treated as a dividend in one country and as business profit in the other, or interest recharacterised under thin capitalisation rules. The categorisation that governs your credit here follows the domestic rules only, whatever the foreign return calls the income.
Can heavily taxed investment income move out of the passive basket?
There is a mechanism for it. Passive income that has borne foreign tax at a rate above the domestic rate applying to it is taken out of the passive basket and grouped with active income instead, on the reasoning that it does not carry the low-taxed character the passive basket exists to police. The effect can be helpful, because the tax comes across with the income, where it may relieve domestic tax on a larger pool. It is not elective, though. It applies where the test is met and not otherwise, and testing it means computing the effective foreign rate on that income rather than reading a rate off the foreign notice.
How are deductions split between the baskets?
By allocation and apportionment, and it changes each basket ceiling. Expenses that relate definitely to one class of income are allocated there; the rest are apportioned on a reasonable basis, with interest expense generally apportioned by reference to assets rather than to the income they produced. Because the ceiling for a basket is the domestic tax on that basket net foreign income, pushing deductions into a basket lowers the credit available in it without reducing the foreign tax paid. That is how a filer ends up with unused credit in one basket and unrelieved domestic tax in another, and it is why the allocation working papers matter as much as the totals.
Can a treaty change which basket income goes into?
It can change the sourcing, and sourcing drives the basket. Where a treaty requires income the domestic rules treat as home-source to be treated instead as arising in the other country so that relief is available, that resourced income is generally kept in a basket of its own, and the foreign tax comes with it. The point of the separation is that resourced income should not enlarge the ceiling for ordinary foreign income of the same class. Practically, a treaty-based claim adds a basket to the computation rather than merging into an existing one, and carryover in it stays there.
Is the foreign tax credit refundable?
No. It reduces your tax to nil at most; it never pays out beyond that. Where foreign tax exceeds the credit you are allowed, the excess is generally carried back or forward within its own category rather than refunded — so a high-tax year abroad can leave a balance you use in a later year. Tracking those balances matters, because an unused carryforward can expire. Our carryforward tracker keeps the running position.
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.
