British pension for retiree living in Poland

I am not 100% sure but it seems true to me that as long as you have exclusively foreign source of income you can freely choose whether you want to have it taxed here in Poland or in the country which is the source of your income. It's based on EU agreements. I was in a similar situation (with exclusively Dutch income) at some point. Just remember that once you earn even a single penny here in PL the situation will change and complicate.
Bests
Anna

And you cannot have your income completely not taxed. It must be submitted in a tax declaration somewhere - either in PL or UK. If your British law allows it to be free of tax (for some reason that I do not know) it is ok. But it must be declared somewhere (just check where the regulations are more beneficial for you).

I suspect its a bit like my UK rental income

I have to declare it on my Polish tax return but am not taxed specifically on that income as I choose to be taxed on it in the UK

As I am within my personal allowance on UK income it is taxed at 0% in the UK

As I am learning, what you do need to watch is if you get any taxable income in Poland then your pension will be included as income to decide what tax rate you need to pay on your Polish income