Two countries can tax the same income, and the treaty network exists to stop that. What the treaties do not do is make the relief automatic.
In Ukraine, crediting foreign tax runs into three limits in sequence. Each one removes part of the benefit people assume they have.
Limit one: the document
The credit requires a certificate issued by the competent tax authority of the country where the income arose, stating the amount of tax paid and the base or object of taxation, and legalised — consular legalisation or an apostille — in that country.
A broker's annual statement is not this. A 1042-S is not this. A payslip is not this. They are all evidence that tax was withheld; the credit requires confirmation from the tax authority itself, which usually has to be requested, sometimes takes months, and occasionally is not issued in a form that satisfies the Ukrainian requirement at all.
This is where most credit claims die — not refused, simply unsupported by the deadline.
Limit two: the cap
The credit cannot exceed the Ukrainian tax that would have been payable on the same income.
| Item | Amount |
|---|---|
| US dividend, gross | $1,000 |
| Withheld in the US under the treaty | $150 (15%) |
| Ukrainian PIT on a foreign dividend | $90 (9%) |
| Credit allowed | $90 |
| Excess foreign tax | $60, not refunded |
| Ukrainian military levy | $50, payable |
Sixty dollars of the $150 does nothing. It is not refunded, not carried forward, not deductible. Where the foreign rate exceeds the Ukrainian one, the higher rate is simply the rate you paid.
Limit three: the levy
The credit applies to personal income tax. The 5% military levy is a separate obligation, and no amount of foreign withholding reduces it.
In the example above, $150 has already gone to the US Treasury, the Ukrainian income tax is fully extinguished, and $50 is still owed to Ukraine. An investor who reasons "I already paid 15%, more than Ukraine's 9%, so nothing is due" has arrived at the wrong answer by a plausible route.
Underneath all of it: residency
None of this applies to someone who is not a Ukrainian tax resident, which is why the residency question comes first and not last.
Residency is not settled by a day count alone. The tests run in order: permanent home, then centre of vital interests — family, economic ties, the location of business and property — then citizenship. Someone who left Ukraine, spends over 183 days elsewhere, but keeps their family, property and income sources in Ukraine can remain a Ukrainian resident on the centre-of-interests test.
Dual residency claims are resolved by the treaty's tie-breaker rules, and they are resolved on facts, not on a preference stated in a declaration.
How I read it
The mental model most investors carry — "I paid tax there, so I do not pay here" — is right in outline and wrong in every detail that costs money. In practice the relief is partial, conditional on a document that takes real effort to obtain, and silent on a fifth of the liability.
The workable sequence is: settle residency first, then obtain the certificate early rather than at filing time, then compute the credit as the lesser of the two taxes, then pay the levy regardless. Treating the certificate as a spring task is how a legitimate credit becomes an unsupported one.