Turn Minnesota e-Services into an API

What you can build on e-Services

• Get the client list

  Build this

  Reads Manage Client List under Manage clients in your Withholding Tax account: every client you file and pay for as a bulk filer.

  Takes

  Nothing

  Returns

  Client name, Minnesota Tax ID, count

• Get demand letters and missing returns

  Build this

  Reads the demand letters sent for your clients and the list of missing withholding returns that e-Services shows with them.

  Takes

  Client Minnesota Tax ID (optional)

  Returns

  Client name, Minnesota Tax ID, letter name, letter date, missing return period

• Check a bulk file's summary

  Build this

  Reads the summary for an uploaded bulk file of returns or payments: whether it appears error-free, or which errors to correct and resubmit.

  Takes

  Confirmation number

  Returns

  Confirmation number, file type, result, errors to correct

• Make a payment for one client

  Build this

  Uses Make a payment for another account to pay one client's withholding tax and reads back the confirmation number.

  Takes

  Client Minnesota Tax ID, period, amount, payment date

  Returns

  Confirmation number, client, period, amount, payment date

Automate e-Services 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.

• New demand letters for missing withholding returns

  Build this

  Starts

  Every weekday at 8:00

  Step 1

  Get the demand letters and missing returns for all your clients.

  Step 2

  Keep the letters that were not there on the last run.

  Step 3

  Email you the list, one line per client with the missing periods.

• Errors in a bulk file, sent back to your payroll system

  Build this

  Starts

  When your system calls the workflow's webhook with a confirmation number

  Step 1

  Check the bulk file's summary for that confirmation number.

  Step 2

  Stop when the file appears error-free.

  Step 3

  Post each error to correct, with the confirmation number, to your payroll system's webhook.

• Monthly client list check

  Build this

  Starts

  Monthly on the 1st at 7:00

  Step 1

  Get the client list from Manage Client List.

  Step 2

  Compare it with the last run and keep the clients added or removed.

  Step 3

  Email you the changes so you can match them against the clients you serve.

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 the client list” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "www.mndor.state.mn.us/get_client_list",
    "input": {}
  }'

{
  "status": "completed",
  "data": {
    "clients": [
      {
        "client_name": "Acme Fabrication LLC",
        "minnesota_tax_id": "9000412"
      },
      {
        "client_name": "Northwind Dental PA",
        "minnesota_tax_id": "9000587"
      },
      {
        "client_name": "Globex Logistics Inc",
        "minnesota_tax_id": "9000633"
      }
    ],
    "count": 3
  }
}

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.

E-Services’s own options

The Department of Revenue documents file uploads for bulk filers, not an API. Registered third-party bulk filers upload a spreadsheet file of returns or a file of payments in e-Services and get a confirmation number and a summary of errors. Deposits can also go by ACH credit from your bank. Client lists and demand letters are reviewed in e-Services.

Read on November 12, 2026: Third-Party Bulk Filers (Withholding Fact Sheet 5), Verification Codes.

Signing in to e-Services

e-Services asks for your username, password and a verification code, sent by text message or email, or taken from an authenticator app. With Fous you sign in once through e-Services' own sign-in with your own account: the login is sealed with AES-256, codes sent by email are handled, and an expired session is signed back in.

Worth knowing

Register as a bulk filer first

With a Minnesota Tax ID, you call 651-282-9999 or 800-657-3594 and say you are registering as a third-party bulk filer. Without one, you apply online and indicate that you are a bulk filer.

Clients bring their own Tax ID

A client needs a Minnesota Tax ID and a withholding account before you add them. Bulk filers cannot set up Tax IDs or update client addresses, and must update the client list monthly.

Demand letters arrive in two rounds

The first demand letter goes out about 5 days after the due date and a second about 16 days after. The letters and the list of missing returns are generally in e-Services about 5 days after the first letter.

Every file gets a confirmation number

Each uploaded file of returns or payments gets a confirmation number and a summary that says it appears error-free or lists errors to correct and resubmit.

More in Government: US state and local tax

• Ohio Business Gateway
• MyFTB
• CDTFA Online Services
• Colorado Revenue Online
• Florida DOR eServices File and Pay
• Georgia Tax Center
• INTIME
• LaTAP
• Maryland Tax Connect
• MassTaxConnect
• Michigan Treasury Online
• My DOR
• myconneCT
• MyDORWAY
• myPATH
• MyTax Illinois
• MyTaxes Kentucky
• NCDOR eBusiness Center
• New Jersey Tax Portal
• NY Business Online Services
• OH|TAX eServices
• Texas Comptroller Webfile
• TNTAP
• Virginia Tax Business Online Services
• Wisconsin My Tax Account

Other industries: NCSUITS, VWR (Avantor), Bullhorn, McKesson Connect, NIPR, Collaborati.