Is working in the tax administration, which imposes late fees on citizens, permissible (halal)? And is the bonus derived from these fees permissible (halal)? If the bonus is from usury (riba), is it permissible to use it to pay off the interest on a housing loan due to the necessity of marriage?

The state is permitted to impose taxes if it needs them to provide essential services to meet the nation's needs. There is no objection to working in the field of imposing these taxes if they are for meeting needs and providing social services due to a scarcity of economic resources. The fines imposed on those who delay paying taxes are not usury; rather, they are discretionary penalties about whose permissibility scholars have differed. As for borrowing for housing for marriage, it is not permissible if it is an interest-bearing loan (riba-based), but it is permissible if it is a benevolent, non-interest-bearing loan (qard hasan (definition)). It should be noted that some luxury needs are not considered a religious necessity.