Is the flat rate for office and administrative expenditures and for travel expenditures for partners from an EU Member State 15% or up to 15% of eligible staff costs? If we define a lower than 15% flat rate for one of the project  partners, will it be acceptable?

The flat rate for office and administrative expenditures and for travel costs for partners based in EU territories is set at 15%. It won’t be possible to declare a percentage higher or lower than the established threshold.