Declaration of your turnover and charges to pay
Once you have started your work as an auto-entrepreneur, you will have to declare your turnover every month, or every three months, in the website of URSSAF. Then, once you will follow their links, your will pay around 25% of what you have got (without VAT) as taxes to URSSAF, and to other accounts.
If you want to do a simulation of how much you may have to pay, here is a website of Agence France Entrepreneur which you can follow (with the help of a friend who can read and translate you the texts).
How often you want to declare (monthly or every three months) is a choice you have to do. Once you have done that choice, you will have to respect that and declare your turnover by the due time, to avoid paying penalties.
Do not do delay neither to pay your charges. As, once you have declared your turnover and if you have not paid your charges, they may send your file to a huissier, on which case there are charges of huissier which will be added on top of what you are to pay. So, be very serious about this part to avoid paying extra money.
Sourav Choudhury is a social entrepreneur living in France since 2003 and working for the cause of Indian community of France, since 2007. He is founder of multiple projects: the largest social network of the Indian community of France, a French language school for english speaking expatriates, this website, and few other projects.