Interest from Poland - how to declare it in the UK and what about the tax implications?
Most Poles who have decided to move permanently to the UK still maintain their bank accounts in Poland. Interest accrues on these accounts, and the bank automatically deducts a 19% tax from it, known as the 'Belka tax.' In Poland, this mechanism typically settles the matter, but for UK tax residents, the situation is much more complicated.
How does the 'Belka tax' work in Poland?
The tax on interest from deposits, savings accounts, bonds, or stock market gains has been designed to be as simple as possible for the taxpayer. The bank acts as the payer, meaning it calculates the due tax itself, deducts it when interest is paid out, and remits it to the tax office. The client only sees the net amount and does not need to take any additional actions, file declarations, or analyze the details of the settlement. Importantly- there is no tax-free allowance, and every gain is taxed. This model means that for the vast majority of people, the matter is concluded once the funds are credited to their account.
In the Polish context, the assumption that since tax has been automatically deducted, the income has been definitively settled is correct, as the system was designed precisely that way. The problem only arises when the same income begins to be assessed by a different tax system, which operates according to its own logic.
UK Tax Residency with a Polish Bank Account
In the UK, what matters most is not where the bank account is located, but where the taxpayer resides. If an individual lives in the UK and holds tax residency there, HMRC treats them as subject to taxation on all their income, regardless of its source. This means that interest from an account held in Poland is not viewed as a separate, 'foreign' category of income, but rather as part of that individual's global income.
In practice, this completely changes the way such income is viewed. What functions as a closed accounting matter in Poland becomes part of the tax assessment in the UK, which must be evaluated in a broader context – it doesn't matter that the funds are in a Polish account or that tax has already been deducted by the bank. What matters is the fact that income has been earned by a UK resident.
Why 19% in Poland Doesn't Settle the Matter
The key lies in the agreement between Poland and the UK – according to its provisions, the tax on interest collected in Poland should not exceed 5%, whereas in practice, the bank deducts the standard 19%. This means that an overpayment occurs right from the start.
As a result, a situation arises that is particularly unfavorable from the taxpayer's perspective. On one hand, there is an overpayment of tax in Poland, resulting from the application of the standard rate instead of the one stipulated in the international agreement. On the other hand, the income is not automatically declared in the UK, because the taxpayer assumes it has already been settled.
This combination simultaneously entails financial loss and tax risk. The overpaid tax in Poland does not benefit the taxpayer, and the lack of settlement in the UK can lead to the need for corrections, interest charges, and in some cases, penalties. This problem often remains unnoticed for an extended period because it involves relatively small amounts that do not attract immediate attention.
Interest from a Polish account might seem like a marginal financial element, but in the context of UK tax residency, it takes on an entirely different significance. What operates automatically and without intervention in one country requires conscious consideration and analysis in another. In cross-border matters, the biggest problem is rarely the failure to pay tax; much more often, it's the belief that if something has been settled in one system, it doesn't need to be checked in another.
