I've never had to pay any tax
Dude stay away from that in Poland,unlike states one cant just go to costco or BJs to buy a cash register and declare what you want on taxes.In Poland cash registers are registered with the tax dept.They have learnt from states and developed it.And unlike states the tax department legally dont have to make a appointment to come check you,they just hop in:)Plus vat is 23% in Poland unlike the sales tax in NJ is 7%(dont know whats in chicago) so the tax dept collects significant amount.Laws are stricter there as all cashiers have to legally give you receipt of merchandise you purchase or they can be fined(owner is not charged)In an incident with my friend his employee refused to operate because his receipt printer was not working.
Plus instead of buying a property you can rent it with option to buy.