In a recent Consultation Solution (SC COSIT No. 15/21), the Federal Revenue Service admitted that the offsetting of negative income tax and social security contribution credits for the 2018 period can be offset against social security contribution debts, provided the company uses e-Social. The taxpayer’s doubt arose because some monthly tax estimates were collected before the enactment of Law No. 13,670, of May 30, 2018. However, the RFB correctly understood that these collections are merely advances of the tax due, which are only constituted at the end of the fiscal year.