What are the average salaries for the steps of an academic career in Italy (RTDa, RTDb, Associate Professor, Full Professor)? In the vacancy announcements that I've seen, this information was not included. Are there any tables containing this information? Are the salaries or bonuses individually negotiated or fixed nation-wide?
They are essentially fixed nation-wide, apart from a minor portion of local taxes.
Here are the tables for my university. Labels are in Italian, but "Costo a.l. Amm." means "gross yearly salary", and "tempo pieno" means "full-time". You get a raise every three years.