The plans are to raise the maximal social security income (“максимален осигурителен доход”). This will arguably* disproportionately affect people with incomes above 3000 BGN.

*) Arguably because (while they could easily afford to pay more tax) higher income employees usually get taxed on their actual amount of income as opposed by the rampant tax evasion among employees with lower pay and their employers (so called grey economy: employers declare they pay a given employee the BG equivalent of the US 'minimum wage' which the employee receives monthly via bank transfer, while the rest of the salary is given in cash and not declared).