Get your MyDORWAY returns and letters through an API

What you can build on MyDORWAY

• Get returns and periods for a tax account

  Build this

  Opens the Accounts tab, picks one tax account and reads View Returns and Periods: each period and whether its return is Draft, Submitted or Processed.

  Takes

  Tax account, periods since (optional)

  Returns

  Account type, account number, account name, period end, return status

• List letters

  Build this

  Opens the More tab and reads View Letters under Correspondence: the notices and letters SCDOR has sent to your accounts.

  Takes

  Received since (optional)

  Returns

  Letter ID, date, letter name, tax account

• Get payments

  Build this

  Reads Manage Payments and Returns under More, Payments & Returns, with Show set to Payments and Pending, so pending ACH debits appear too.

  Takes

  Tax account (optional), paid since (optional)

  Returns

  Payment date, tax account, period, amount, method, status, confirmation number

• Enter a sales and use tax return

  Build this

  Fills in the ST-3 sales and use tax return for one period, with gross proceeds, deductions and the local taxes of the ST-389, and saves it as a draft or submits it.

  Takes

  Sales tax account, period, gross proceeds, deductions, ST-389 local taxes, draft or submit

  Returns

  Period, state tax, total amount due, status, confirmation number

Automate MyDORWAY 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.

• Sales tax periods still open before the 20th

  Build this

  Starts

  Every month on the 15th at 8:00

  Step 1

  For each sales tax account you name, get the returns and periods.

  Step 2

  Keep last month's periods whose return is not Submitted or Processed.

  Step 3

  Email you the list, with the account, period and status.

• New letters from SCDOR, every week

  Build this

  Starts

  Every Monday at 7:30

  Step 1

  List the letters in View Letters.

  Step 2

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

  Step 3

  Have an AI step group them by tax account and email you the list.

• Payments posted to your accounting system

  Build this

  Starts

  Every weekday at 17:00

  Step 1

  Get the payments made or scheduled since yesterday.

  Step 2

  Keep the payments that changed since the last run.

  Step 3

  Post date, tax account, period, amount, status and confirmation number to your webhook.

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 returns and periods for a tax account” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "mydorway.dor.sc.gov/get_returns_and_periods",
    "input": {
      "account": "Acme Supply LLC, Sales",
      "periods_since": "2026-07-31"
    }
  }'

{
  "status": "completed",
  "data": {
    "account_type": "Sales and Use Tax",
    "account_number": "XXX-XX4417",
    "account_name": "Acme Supply LLC",
    "periods": [
      {
        "period_end": "2026-10-31",
        "return_status": "Draft"
      }
    ]
  }
}

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.

MyDORWAY’s own options

SCDOR offers no API for MyDORWAY. Sales and use tax returns can come from certified third-party software as XML files that you upload in MyDORWAY, and payroll filers with 10 or more withholding returns a quarter can upload batch files. Everything else, letters and payments included, is done on screen. MyDORWAY itself is free.

Read on November 12, 2026: Sales XML Program, Batch Withholding Program, File & Pay Options for Businesses.

Signing in to MyDORWAY

MyDORWAY signs you in with a username and a password of at least 14 characters, then a second step: a code from an authentication app, a text message or an email. A passkey can replace both. With Fous you sign in once through MyDORWAY's own sign-in with your own account, sealed with AES-256. When your second step is an emailed code, it is handled and an expired session is signed back in.

Worth knowing

Only a Submitted return can be withdrawn

A return in Submitted status can be withdrawn back to a draft and edited. Once it is Processed, you file an amended return. Drafts not submitted within 30 days are deleted.

XML files cannot replace a filed period

A Sales XML file is not processed for a period that already has a return on file for that account. Each return in the file needs its own valid 9-digit retail license file number.

One bad number rejects a whole batch

Batch withholding files need a valid FEIN and 9-digit SC withholding file number on every record, or MyDORWAY rejects the entire file. A file holds WH-1605 or WH-1606 returns, never both.

Business Owners decide who sees what

A Business Owner manages every business account from one login and controls other users' access. A Tax Account Manager, such as a preparer, requests access to each client and cannot change anyone's access.

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
• Minnesota e-Services
• My DOR
• myconneCT
• 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: UCMS, mySchneider, SAP Fieldglass, McKesson SupplyManager, Travelers for Agents, MyHMCTS.