1. vehicle tax
Obliged to pay once a year, but there are also those who do not pay and the authorities also do not come to the taxpayer's house and in the end it is left abandoned
It depends on the country's laws, but in most of them if you just abandon your vehicle it doesn't mean you stop getting taxed for it, it's still registered in your name and your property, and you are going to have to pay tax until you void your registration, basically stating that the vehicle is not drivable anymore.
However, there is a provision that if someone has ever borrowed a large amount of money from a bank, even though the borrower was not notified by the taxpayer at first, in the end he was exposed to the taxpayer's accumulation of taxes over the years and he didn't know.
The borrower is the person who took the money, a tax payer is a normal citizen, and the borrower can't be notified by the tax payer more by the tax collecting agency in your country. Second, it doesn't matter if you borrow money or not, taxes are paid if you have any kind of event on hat revenue, and there is no such thing as not knowing about it.
You've earned $1000 from any kind of work, be it selling your crafts or doing a freelance job you must register and pay taxes, unless in your country revenues under a certain amount aren't taxable, but that doesn't matter you don't have to fill your taxation form, even if you're not going to pay a dime.
Let's say a farmer in 1 harvest (3-4 month) earns $2000, he will remain tax free if not registered or he doesn't register it whereas an employee from the start is already registered with the taxpayer even though their monthly salary is $300.
Unless your country clearly states that revenue from farming is not a taxable income for under x amount, what that farmer is doing is tax evasion, in most of your post you're mistaken tax dodging with tax exemption, tinking hat if you're not paying it's just like that and it doesn't matter. The inability of your government to catch you doesn't make it legal.