As an EU national, if you live in France for a few months, what are the rules around registration / tax / etc?

Within the EU, for EU nationals, there is a right to freedom of movement, which (slightly simplified) means you can visit, live and work in any other EU country. Depending on the country you go to, you can't always just rock up and stay there without doing anything, as there are things like Directive 2004/38/EC which means that in some countries, you may have to register. There's also the whole tax thing that gets involved if you stay too long...
I'm thinking of going to France for a few months, which while not long enough to qualify as an expat under our rules, I don't want to find myself in trouble if the French government has different ideas about where that threshold lies!
As an EU national, if you're going to be in France for a few months, but not working for a French firm, what (if any) are the rules that apply to you around registration / residency / tax / etc?
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How long can an EU citizen spend in another EU country?
As an EU citizen, you have the right to move to any EU country to live, work, study, look for a job or retire. You can stay in another EU country for up to 3 months without registering there but you may need to report your presence. The only requirement is to hold a valid national identity card or passport.Do EU citizens need a residence permit in France?
EU/EEA/Swiss nationals moving to France Since France is an EU country, there is no legal requirement to apply for a residence permit (carte de s\xe9jour); you can do so if you wish. It's free of charge and valid for up to five years.Can you be registered in two countries EU?
Yes. You can stay in a second EU country for more than three months for purposes including work, study or training, if you apply for and are granted a residence permit in this second country.How long can a non European stay in Europe?
If you're a tourist, you do not need a visa for short trips to EU countries, Switzerland, Norway, Iceland or Liechtenstein. You can stay for up to 90 days in any 180-day period.Rights of EU Citizens (That Many Somehow Don't know!)
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Images: SlimMars13, David Henry, Nataliya Vaitkevich, Nataliya Vaitkevich