Short answer
Start with the returns and tax tasks you need handled. DNIT allows an independent professional or accounting firm to act as a Tercero Autorizado (authorized third party) in Marangatu; its current guidance was published on February 2, 2026. Check the authorization in your account, request a written scope and fees, and keep your password private.
Define the work before requesting quotes
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Tasks needed
List the returns, invoicing and other tax tasks you need, including how often they occur.
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Written proposal
Ask for a written proposal covering tasks, deadlines, fees, extra charges and who will file each item.
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Same scope
Compare quotes for the same scope and agree how you will receive copies of submissions.
Protect access and understand the limits
DNIT says the Marangatu password is confidential and cannot be transferred. Use the system’s authorization process instead of giving your password to a provider. We have not checked any named firm’s identity, fees or service quality, so no provider is ranked here.