1. Except in the case of fraudulent manoeuvres, tax increases of any kind are not applicable to taxpayers who have spontaneously made known, by registered letter sent within three months of joining an approved management centre, association or mixed management body, the shortcomings, inaccuracies or omissions contained in their declarations.
2. The benefit of this measure is subject to the double condition:
a. That these insufficiencies, inaccuracies or omissions have not been the subject, prior to the date of dispatch of the registered letter referred to in 1°, of the initiation of any administrative or judicial proceedings or of any proposed rectification;
b. That the principal tax is paid within the new time limits.