What is the difference between chiffre d'affaires and declaration d'impots?

In a "Demande complementaire pour les non-salaries" I am being asked to "précisez le montant de votre derniers chiffre d'affaires annuel connu" by CAF. Do thye want cashflow, all income, or perhaps the total declared for my "foyer"for le revenu. Since there is a duplicate form for my wife I don't want to double up by entering for the foyer.

I don't want to include my annuity income if they just mean my professional liberale cashflow.

Any advice?

Chiffre d'affaires=turnover, if that helps.

Since "non-salariés" specifically means self-employed people or business owners, I presume that is what they're after.