Do I have to file at home while living in Poland?
Residence decides it, and residence is a question of facts rather than of where your post arrives. The one exception is US citizenship, which carries the filing obligation with the person wherever they go. So the first thing we establish is which system still claims you.
Is there a treaty between my country and Poland?
Treaty networks change with each protocol and each multilateral-instrument position, so we confirm the treaty in force for your specific year with the issuing authority rather than relying on a published summary. Where there is none, unilateral relief and domestic law do the work instead.
I own property in Poland. Where is the rent taxed?
Rent from immovable property is almost always taxable where the property is situated, frequently by withholding on the gross amount, with your home country taxing the same income and giving credit. A net-basis election, where one exists, is usually the difference between tax on profit and tax on turnover.
I moved to Poland for a tech job. Do I still file in Canada?
For the year of the move, certainly. That year is split between residence and non-residence, one return covers both parts, and there is a reckoning of what you owned on the day you left. After that it depends on what stayed behind. A condominium kept and let at a market rent, a spouse who follows later, a car and a driving licence retained all pull towards continued residence, and continued residence means Canada taxes the Polish salary with credit for Polish tax rather than ignoring it. Decide the position before the first Polish payslip arrives; arguing backwards once two systems have taxed a year differently is much harder.
Poland gives relief to returning residents. Does that change my Canadian credit?
Yes, and in the direction people do not expect. A foreign tax credit relieves tax actually paid abroad, so a Polish relief that lowers the Polish liability lowers the credit available at home by the same movement. Where you remain resident at home, the relief improves the Polish position rather than your total burden, because the home country simply collects what the credit no longer covers. That is not a reason to decline a local relief — it costs nothing to claim and it matters greatly if residence has genuinely moved. It is a reason to model both sides together before assuming a local incentive is money in your pocket.
Does the Polish relief for younger taxpayers affect what I report at home?
It changes the tax paid in Poland, not the income earned there. Your home return reports the gross employment income regardless of what local relief reduced the local bill to, and the credit you can claim is limited to the Polish tax actually suffered. So a young assignee who pays little or nothing in Poland reports the same salary at home as a colleague who pays in full, and carries more of it home. Eligibility for the local relief depends on personal circumstances that can change during an assignment, which is why the local computation should be reviewed each year rather than rolled forward.
Will I be taxed twice on my Polish salary?
Both countries can charge the same income, but the system is built so that you do not bear both charges in full. Where a treaty applies it allocates the employment income, and the country of residence relieves the other country's tax, usually by credit. The practical failures are not conceptual: a credit claimed in the wrong year because the payroll years differ, a credit claimed for a social contribution that is not an income tax, or no credit at all because nothing was kept to prove the deduction. Hold the annual Polish statement and the employer's year-end document, and file both sides from the same set of figures.
I live in the US and own a flat in Krakow. What do I report?
The rent, on your American return, in dollars and computed under American rules, whatever Poland has already taken from it. Polish tax on that rent is relieved by credit rather than by omission. The bank account the rent is paid into is reportable separately from the return, on its own filing, and the threshold for that filing is low enough that an ordinary rental account often crosses it. If the flat was inherited, establish its value at the date you acquired it now rather than when you eventually sell. Keep the lease, the Polish annual statement and the bank statements together.
My Polish employer withholds every month. Why do I still file a return there?
Because monthly withholding is an instalment against a liability computed for the whole year, not a final tax. The annual return reconciles what was taken against what is due once reliefs, joint filing options and deductible contributions are applied, and for an assignee arriving or leaving mid-year the monthly calculation is almost always wrong in one direction or the other. The reconciliation also produces the document your home country will want as evidence of foreign tax paid. Filing it late or not at all leaves the home credit resting on payslips, which is a weaker position than resting on an assessment.
What is a foreign tax credit?
A credit against your home-country tax for income tax you already paid to another country on the same income, so the same amount is not taxed twice at full rates. It is capped: you cannot credit more than your home country would have charged on that income, which is why a higher foreign rate leaves an unused balance rather than a refund. In the US it is claimed on Form 1116, in Canada on the T2209 and T2036, in India on Form 67. See Form 1116.
What happens if I have not filed for several years?
Missed years are handled as one package, not one at a time, because the route chosen for the first year determines the relief available for the rest. Each country has a disclosure or relief programme with its own conditions, and entering the right one — before the authority contacts you — is usually what keeps penalties down. Filing quietly outside a programme forfeits that protection. See catching up on missed returns.
