The first ex-post audits in H2020 projects show that participants continue to make mistakes in their cost claims. A persistent high error rate damages the reputation of the EU Framework Programme and of research in general. Also, for you as beneficiaries, such errors may lead to annoying and costly consequences. It is therefore in our common interest to avoid them as much as possible. To this end, the Commission has prepared a short guidance document on "How to avoid errors when claiming costs in H2020 grants".