I only obtain income from my polish account banks on my deposits(interest payment) but the bank sends to the urzad skarbowy the tax on interest.(19%)
I've never filled out the PIT cause I haven't worked in Poland during the last 5 years.At any rate, in 2016 I'll fill out my application for PR and I hope everything will be O.K.
Uh-oh. This will get you into trouble - you have an obligation to fill out the PIT as you've received income while being legally resident in Poland for tax purposes. Even if the calculations are very simple, you're still obliged to do so. I will tell you for a categorical fact that the tax office will question you when you try and apply for permanent residency as you'll need a tax certificate to do so.
Go to the Urzad Skarbowy and sort it out. Now.