Failure to lodge the declaration within the time limits specified in articles L. 115-4 and L. 115-11 entails the application of an increase of :
1° 10% if no formal notice is served or if the return is filed within thirty days of receipt of a formal notice, served by registered post, to file the return within that period ;
2° 40% where the declaration has not been filed within thirty days of receipt of a formal notice, served by registered post, to file it within that period.