All about taxes for expats in France

Hello, I've lived and worked in France since 1980 and for the first 3 or 4 years it didn't occur to me to do a tax declaration, having been used to the PAYE system in the UK., Suddenly in August 1985, I received 4 letters from the Fisc (Trésor Publique) claiming income tax over 4 years plus 10% extra for late payment.  I managed to negotiate deduction of the 10% and was able to pay in instalments.  From my experience, it's not a good thing to 'forget' to declare your income here in France.  However the employees at the tax offices are reasonable and will organize your payments over a number of months.  Nowadays, payment 'à la source', similar to Pay as you earn, for "salariés" is an accepted means of paying your income tax but you still have to do a yearly declaration.  On-line makes it easier. 
As for housing tax, if you are renting, you may have to pay taxe d'habitation.  For those lucky enough to have bought a property, taxe foncière is due yearly in October.