This may sound ridiculous, but the unpaid tax levels that trigger criminal responsibility in Bulgaria are indeed ridiculously low. Only 1534 EUR in unpaid taxes can result in jail sentence. 6135 EUR or more is considered as “heavy crime”.
Always be aware of your exposure and take calculated risks. - my two cents
Bulgarian interim government combats tax evasion - BgLaw.eu
The caretaker government in Bulgaria is taking harsh actions against big companies with unpaid tax debts. Criminal responsibility for taxes.bglaw.eu
Yes the same leather jacket guys have put on suits now. Racket is in the form of tax authority.
Nothing to worry about if you're well connected.