Meeus - a self-help resource for the FP7 user community

I have heard from two other organisations that the Commission will not allow the inclusion of “marketing costs” in the calculation of overhead (indirect costs). I don’t understand this, because the FP7 rule is that you should use your usual “accounting principles and practices”. It is usual practice for my organization to include our marketing costs in our overhead: I can prove from our accounting system that we charge all our customers some overhead including marketing costs. So is it safe to charge the Commission in the same way or must I expect that the Commission will refuse to pay?