: Income taxes in France: Is it better to share our income taxes or pay separately, me and my gf? My lady and I are living in France and paying our taxes there, separately. However, we are considering to pay our taxes together

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In any case, you'll pay less taxes if you do a common declaration.

Why?!

Because the Quotient Familial (QF) helps you. This is simple mathematics : If salary 1 = salary 2, you gain/lose nothing. If salary 1 and salary 2 are quite different (for example if one doesn't work, or one is part-time while the other is full-time...), you'll save quite a lot.
Let's say you are taxed on 30 000€, and your significant other is taxed on 20 000€.

Two declarations scenario

You

You are alone (QF = 1), and declare 30 000€, which will go into these slices.
0% of 9710€ = 0€
14% of 17107€ = 2394,98€
30% of 3181€ = 954,3€
Total : 3349,28€

Your SO

Your SO is alone (QF = 1), and declares 20 000€, which will go into these slices.
0% of 9710€ = 0€
14% of 10290€ = 1440,60€
Total : 1440,60€

Grand Total : 4789,88€

Common declaration scenario

You are considered a couple (QF = 2), and combine your declarations : 50 000€.

Since QF = 2, you calculate as if you were declaring 50 000 / 2 = 25 000€, which will go into these slices.
0% of 9710€ = 0€
14% of 15290€ = 2140,60€
Total : 2140,60€

This gives you the tax for a part. Multiply it with QF.
Grand Total : 2140,60 x 2 = 4281,20€.

Result

In this example, doing a common declaration will allow you to save 4789,88 - 4281,20 = 508,68€.