Get your IRS Tax Pro Account client data through an API

What you can build on Tax Pro Account

• Get active authorizations

  Build this

  Reads the Taxpayers tab of a linked CAF number and, for each taxpayer, the active POA and TIA authorizations recorded on the CAF.

  Takes

  Taxpayer name (optional)

  Returns

  Taxpayer, individual or business, authorization type, tax matters, tax periods

• Get a client's balance due and payments

  Build this

  Opens one taxpayer from the Taxpayers tab and reads the taxpayer information your authorization covers: balance due, payment activity and, for individuals, audit status.

  Takes

  Taxpayer name

  Returns

  Taxpayer, balance due, payments with date, amount and tax period, audit status

• Check POA and TIA request status

  Build this

  Reads the history of POA and TIA requests you submitted through Tax Pro Account, with the status each one shows.

  Takes

  Submitted since (optional)

  Returns

  Taxpayer, request type, tax matters, tax periods, submitted date, status

• Withdraw from an authorization

  Build this

  Opens a taxpayer's authorizations from the Taxpayers tab and withdraws the one you name, which removes it from the CAF at once.

  Takes

  Taxpayer name, authorization type, tax matter, tax periods

  Returns

  Taxpayer, authorization type, tax matter, tax periods, withdrawn

Automate Tax Pro Account with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Weekly client balance due and payment activity check

  Build this

  Starts

  Every Monday at 7:00 Eastern time

  Step 1

  Get the active authorizations to list every taxpayer on the Taxpayers tab.

  Step 2

  For each taxpayer, get the balance due and payment activity.

  Step 3

  Keep the clients whose balance due or payments changed since the last run.

  Step 4

  Email you the list, with balance due and the new payments.

• Approved POA and TIA requests, posted to your practice system

  Build this

  Starts

  Every weekday at 8:00 Eastern time

  Step 1

  Check the status of the POA and TIA requests you submitted.

  Step 2

  Keep the requests that show approved and did not on the last run.

  Step 3

  Post each one to your webhook with taxpayer, type, tax matters and tax periods.

• Audit status changes for individual clients

  Build this

  Starts

  Every weekday at 9:00 Eastern time

  Step 1

  Get the active authorizations to list the individual taxpayers on the Taxpayers tab.

  Step 2

  For each one, get the balance due and audit status.

  Step 3

  Keep the clients whose audit status changed since the last run.

  Step 4

  Email you each change with the client's balance due.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get active authorizations” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "sa.www4.irs.gov/get_active_authorizations",
    "input": {}
  }'

{
  "status": "completed",
  "data": {
    "taxpayers": [
      {
        "name": "Acme Holdings Inc",
        "type": "business",
        "authorizations": [
          {
            "type": "POA",
            "tax_matters": "Income Tax",
            "tax_periods": "2023, 2024, 2025"
          }
        ]
      }
    ],
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

Tax Pro Account’s own options

The IRS publishes no API for Tax Pro Account. Its APIs, reached with an approved application and an API client ID, cover TIN Matching, the Transcript Delivery System, IVES and IRIS, not authorizations or client balances. In Tax Pro Account you request, view and withdraw authorizations and view taxpayer information on the site, one taxpayer at a time.

Read on November 12, 2026: Tax Pro Account, Get an API client ID, Submit Forms 2848 and 8821 online.

Signing in to Tax Pro Account

You sign in to Tax Pro Account with ID.me credentials, and an individual CAF number is linked by the person it was assigned to. With Fous you sign in through Tax Pro Account's own sign-in with your own account. The login is sealed with AES-256, never returned by the API or written to logs, and code and AI agents never see it.

Worth knowing

Link your CAF number first

Taxpayers and active authorizations appear only after you link your CAF number. The IRS mails a PIN to the CAF address, which takes 1 to 2 weeks, and a linked CAF number cannot be unlinked.

Requests go to individuals only

POA and TIA requests in Tax Pro Account reach individual taxpayers, who approve them in their Online Account within 120 days. Business clients still need Form 2848 or 8821.

The site has hours of service

Tax Pro Account is available Monday 6 a.m. to Saturday 9 p.m. Eastern time, and Sunday 10 a.m. to midnight Eastern time. Schedule workflows inside those hours.

You see only what you are authorized for

Taxpayer information is limited to the forms and tax periods approved under your authorization. A new authorization revokes prior ones for the same tax matters, periods and types.

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