The official tax calculator for 2015 can be found using the link below. http://www.impots.gouv.fr/portal/dgi/public/popup?typePage=cpr02&docOid=documentstandard_705 If your French is not up to it then use the Chrome browser which has built in translation. Answer the questions in the right boxes and you get the amount due at the end. It is anonymous so you don't have to give your details. It is worth printing out at the end so you can work out where to put the amounts on your real tax return when it arrives. At your age you would have given your E121/S1 to CPAM so no social payment there. The old CSG tax will apply at 15.5% but you can claim that back (all but 2.5%). You won't be able to after 2015 because CSG has been scraped (good news) and has been replaced with another tax (bad news) which is roughly (in English) a Citizen Tax on everyone living in France and strangely works out roughly to the same rate as CSG.