A transitionary rule will permit those organisations who cannot identify project indirect costs (i.e. previously could have used the AC model) to optionally claim more than the default 20% fixed overheads for projects under calls that close during the first three years of FP7. For projects resulting from calls closing until 31 Dec 2009, they can use 60% overheads and for projects resulting from calls closing the calendar year ending 31 Dec 2013, this will be changed but will not be less than 40%.

An important change for those that could previously have used AC is that permanent staff can now be funded; however they would receive less for Demonstration activities than under AC rules.