Don't underestimate any tax office, they are patient. Taxation possibilities are easy for the state, they just give the order for the technological responsibility to a third party, for instance, your ATM withdrawal could be taxed at source at the ATM, a foreign credit or debit card usage would be the trigger for the banks computer to deduct the tax from the payout once the computer connects with the IO to ascertain that you are a tax resident, it would be the banks responsibility to ensure this, no cost to the state. Modern technology, AI? wouldn't need more personnel, its impersonal you would have to do the running around to get your deductions recognized if you don't turn in a tax form. I've had dealings with British and German tax officials, they are like a dog with a bone regarding their paragraphs but on a personal level they just don't care.