You can always go the localbitcoin route and trade it for FIAT in person without a bank.
But the record will exist in Localbitcoins, right? And nowadays, LBC is asking for tier 2 verification, which includes ID documents and other details. I would advice anyone who doesn't want to pay taxes on Bitcoin profits to travel to a country like Thailand or Indonesia, and then sell their coins for fiat cash.
It is not possible without paying taxes, the government will scan everyone banks for transacting the bulk amounts. So it is always good to pay taxes on Bitcoin transaction so that government will understand to legalize the Bitcoin.