if you start paying︀ taxes on your extra income from now on, nobody will notice, you will be paying︁ more taxes, which is not what triggers alarms in the system. The opposite is what︂ usually trigger alarms. Do whatever puts you in a situation where you are comfortable sleeping︃ at night, everybody has different risk profiles. For sure, if you start paying taxes correctly,︄ if you ever gets a visit from the hacienda, the worse it can happen is︅ a fine for past misdeeds. Even if you go to court, you can settle, they︆ are after the money, not seeing you in prison. good luck!