Below is a high level list of services provided by the Tax Office (aka Finanças)

• Tax Services
  • NIF
  • Submit IRS Taxes
  • Pay Taxes
    • Property Tax (IMI)
    • Stamp Duty (Imposto do Selo)
    • Vehicle Tax (IUC)
• Property Related Services
  • Register Property Ownership
  • Pay or Dispute Property Tax (IMI)
  • Update your Fiscal Address
• Vehicle Related Services
  • Vehicle Tax (IUC)
  • Declare vehicle imported from another country
  • Customs declarations for vehicles and other goods
• Business Services
• Services for Foreign Residents / Expats
• Apply for NIF
• Switch your fiscal status from non-resident to resident
• Request tax info for visa, SEF/AIMA, or legal purposes
• Online Services (Portal das Finanças)
  • https://www.portaldasfinancas.gov.pt
    • Check tax debts
    • Print NIF confirmation
    • Submit tax returns
    • Register receipts (faturas) for IRS deductions
    • Communicate with Finanças via secure messages