We analyse the distribution of pension benefits induced by pension systems moving from a defined benefit formula to a notional defined contribution one. We focus on the reforms that took place in Italy between 1992 and 2004, differently affecting various cohorts of workers. We develop a micro-simulation model that enables to compute pension benefits for heterogeneous individuals belonging to different cohorts, according to pre- and post-reform rules. We find that the defined benefit system is highly redistributive along many dimensions, not just earnings. With the phasing in of the NDC system, redistribution in all dimensions is gradually reduced.