How to Get a Tax ID Number in South Dakota for a New Business (Indiana Context)

What “Tax ID Number” Means for a New Business

“Tax ID number” can refer to different identifiers depending on what your business needs to do. For most new businesses, it means one or more of the following:

• Federal EIN (Employer Identification Number) issued by the IRS for hiring employees, opening business bank accounts, and filing certain federal returns.
• State tax registration number used to report and pay state taxes (often includes sales tax, withholding, and other business taxes).
• Local or industry licenses that may require additional identifiers depending on your business activity.

This guide is titled for South Dakota, but the state context requested is Indiana (IN). If you’re forming or operating in Indiana, you’ll generally need an EIN (federal) and may need Indiana tax registration through the state depending on whether you sell taxable goods/services, have employees, or owe other state taxes.

Quick Snapshot: Indiana Sales Tax and Key Locations

Step-by-Step: Get a Federal EIN (Tax ID) for Your Business

1) Confirm whether you need an EIN

You generally need an EIN if any of the following apply:

• You will hire employees (now or soon).
• You operate as a partnership or corporation.
• You plan to open a business bank account or apply for business credit.
• You will file certain federal tax returns (employment, excise, etc.).

2) Gather the info you’ll use on the EIN application

• Legal business name and any DBA (“doing business as”) name
• Business address and responsible party details
• Entity type (LLC, corporation, sole proprietorship, partnership)
• Reason for applying (new business, hired employees, banking needs)
• Business start date and primary activity

3) Apply for the EIN and save your confirmation

After you receive your EIN, store the EIN confirmation with your formation documents and banking records. You’ll use the EIN for payroll setup, vendor forms (such as W-9 requests), and many state registrations.

Indiana State Tax IDs: When You Must Register with the State

An EIN is not the same as an Indiana state tax account. In Indiana, you typically register with the state if you:

• Sell taxable products or services and must collect/remit sales tax.
• Have employees and must withhold and remit state income tax.
• Owe other Indiana business taxes based on your activity (industry-specific obligations may apply).

Common Indiana registrations new businesses run into

• Sales tax (Registered Retail Merchant Certificate) for collecting Indiana sales tax.
• Withholding tax account for employee payroll withholding.
• Additional accounts depending on the business (special taxes, regulated products, etc.).

South Dakota vs. Indiana: Avoiding a Common Setup Mistake

The title references South Dakota, but your operating state matters. You may need tax registrations in more than one state if you:

• Have a physical location, employees, or inventory in multiple states
• Make sales that create sales tax collection obligations in other states
• Register as a foreign entity to do business outside your home state

If you’re forming in Indiana but doing business in South Dakota (or vice versa), map out where you have employees, offices, inventory, and where you’re making taxable sales. That determines which state registrations you need.

After You Get Your Tax ID: Next Compliance Steps for a New Indiana Business

Open a business bank account and align your legal name

• Match the EIN name to your formation documents and any DBA filings.
• Use the EIN (not your SSN) for business banking whenever possible.

Set up sales tax collection (if applicable)

• Configure your POS/ecommerce platform to collect Indiana sales tax where required.
• Track exempt sales and retain exemption certificates when customers claim exemption.

Set up payroll and withholding (if hiring)

• Register for withholding and unemployment-related accounts as needed.
• Document pay schedules, classifications, and onboarding forms.

Helpful Related Resources

If your business needs to confirm tax IDs for resale or sales tax processes, see EIN verification for resale permit and sales tax applications.

If you’re organizing as an S corporation and need EIN-related guidance, review S-corporation employer identification number application details.

FAQ: Getting a Tax ID Number for a New Business (Indiana Focus)

1) Is a Tax ID number the same as an EIN?

Often, yes. Many people use “Tax ID” to mean the federal EIN. However, “Tax ID” can also mean an Indiana state tax registration number for sales tax or withholding.

2) Do I need an EIN if I’m a sole proprietor with no employees?

Not always. Some sole proprietors use an SSN for federal tax filing. Many still obtain an EIN for banking, privacy, and vendor paperwork.

3) If my business is an LLC in Indiana, do I automatically get an EIN?

No. Forming an LLC does not automatically create an EIN. You must apply separately for the EIN if you need one.

4) What Indiana registration do I need to collect sales tax?

You generally need to register as a retail merchant so you can collect and remit Indiana sales tax and file sales tax returns as required.

5) Can I use my EIN to buy wholesale inventory tax-free?

An EIN alone is not a resale certificate. Wholesalers often require a resale-related form or state registration documentation tied to sales tax compliance.

6) I’m starting in Indiana but selling into other states—do I need more than one tax ID?

You may need additional state registrations if your sales activity or business footprint creates obligations in other states. The EIN stays the same, but state registrations can multiply.

7) What happens if my EIN business name doesn’t match my bank account name?

Name mismatches can delay banking, merchant processing, and vendor onboarding. Align your legal name, DBAs, and EIN records before applying for accounts.

8) Do I need a new EIN if I change my business name?

Usually, a name change does not require a new EIN, but it does require updating records. Certain structural changes (like changing entity type) can require a new EIN.

9) Do I need a new EIN if I move my business to Indiana from another state?

Moving states typically does not require a new EIN. You usually keep the same EIN and register with Indiana for any applicable state taxes and licensing.

10) How do I know whether I need Indiana withholding registration?

If you pay wages to employees performing services tied to Indiana withholding rules, you generally need to register for withholding and remit payroll taxes on a schedule set by the state.

Explore More Topics

• EIN Verification Request – Resale Permit / Sales Tax Application
• S-Corporation Employer Identification Number Application
• California State Board of Equalization
• How to verify an EIN for sales tax and resale documentation
• EIN application guidance for S-corps and new entities