DCTFweb is Brazil’s online tax system, a module of the Public Digital Bookkeeping System (SPED in Portuguese), where taxpayers can log their social security contributions and tax declarations. Brazil’s federal taxes, which are the same across Brazil, must be paid using Documento de Arrecadação de Receitas Federais (DARF, or Document for the Collection of Federal Revenues), which lists the federal tax amount due. Users can see the DARF for income tax and social security by logging in through the DCTFWeb.
Source: auxadi.com