How to contest error in French income tax calculation?

I have just received my income tax statement (avis) and I believe there is a mistake in the calculation. How can I contest this? 

Everyone who declared their 2018 income online will have had their avis d’imposition tax statement by now and final paper avis will be soon arriving by post but, as you suggest, not everyone will agree with what they read in it.

It may happen that on receiving your bill you find it to be too high or ...

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