Can I submit an ERC and a MSCA grant at the same time?

You may submit a proposal for both calls, but in case you should be awarded with both you have to decide for one because double funding (EC money for the same research work in both projects) is not allowed. In this FAQ it is stated that in the case of the Marie Curie grant, the REA and the ERCEA have set up specific procedures to verify whether and to which extent a Marie Curie grant and an ERCEA grant can be considered as complementary and to detect any possible overlapping of funds."