Kentucky Form 10A100 Tax Registration: Sections, Filing, and Updates

Kentucky Form 10A100 is the tax registration application you file with the Kentucky Department of Revenue to open the state tax accounts your business needs, including sales and use tax, employer withholding, and corporate income or limited liability entity tax.1Kentucky Department of Revenue. Business Registration There is no filing fee. You can submit it online through MyTaxes.ky.gov, which the Department recommends for faster processing, or send a completed PDF by mail, fax, or email.

What to Have Ready Before You Start

Gathering everything first saves a second pass. Missing one item will stall the application.

  • Federal Employer Identification Number (FEIN). Most business structures need one. A sole proprietor without employees can use a Social Security number, but an FEIN is still useful for banking and future hiring.
  • Kentucky Commonwealth Business Identifier (CBI), plus your Secretary of State organization number and date of incorporation or organization.
  • Legal business name and DBA, entered exactly as registered with the Secretary of State. Mismatches with your formation documents trigger rejections.
  • Physical business address in Kentucky — the actual location of operations, not just a mailing address. The form asks whether you operate from a home, office, web-based location, or transient setup.
  • Owner and officer details for every responsible party: full legal name, Social Security number, date of birth, driver’s license information, title, effective date of that title, and home address.2Kentucky Department of Revenue. Kentucky Tax Registration Application
  • NAICS code for your business activity. Look yours up at census.gov/naics before you start.
  • Accounting period and method — calendar or fiscal year, cash or accrual.
  • Estimated gross monthly sales tax and estimated annual withholding. The Department uses these to assign your filing frequency.

How the Form Is Organized

The form uses lettered sections rather than a straight Part I-II-III structure, and you only complete the ones that apply to your business.

Section A — Reason for the Application

Check the box that fits your situation: new business, resuming operations, hiring employees, buying an existing business, or bidding on a state contract. Enter the effective date and any previous Kentucky tax account numbers you’ve held.

Section B — Business and Responsible Party Information

This is the identity core of the form. Enter the legal name, DBA, FEIN, CBI, Secretary of State details, primary business location, business structure, federal tax treatment, and personal information for every owner, partner, or officer. Take the responsible party disclosures seriously; the people you list here are the people the Department can pursue personally if the entity later defaults on trust fund taxes.

Section C — Tell Us About Your Business

Describe your business activity, list what you sell, and enter your NAICS code. Then work through questions 19 through 59, which determine the tax accounts you need. Each cluster of questions covers a specific tax type: employer withholding, sales and use tax, transient room tax, motor vehicle tire fee, telecommunications tax, consumer’s use tax, corporate income tax, and others.2Kentucky Department of Revenue. Kentucky Tax Registration Application A “yes” in Section C sends you to a matching detail section later in the form.

Sections D Through H — Tax-Specific Details

Section D covers employer withholding specifics: number of Kentucky employees, date wages were first paid, and estimated annual withholding. Section E handles sales and use tax, transient room tax, motor vehicle tire fee, and the CMRS prepaid service charge. Sections F, G, and H cover utility gross receipts, corporate income and LLC entity tax, and coal-related accounts, respectively. Skip any that your Section C answers didn’t trigger.

Signatures

Every authorized individual listed in the ownership section must sign, add a title, and date the form. The Department routinely rejects filings where the names in the ownership section don’t match the signatures, so check that alignment before you submit.

Section C Questions That Trip People Up

Section C is where most time disappears, because answering wrong means you get registered for a tax you don’t owe or miss one you do.

Questions 23 through 40 cover sales and use tax. If you sell tangible personal property, digital property, or taxable services under Kentucky law, answer “yes” and plan to complete Section E. The form asks when you first made or expect to make taxable sales and your estimated gross monthly sales. That estimate sets your filing frequency — monthly, quarterly, or annually.

Questions 19 through 22 cover employer withholding. If you have or plan to hire employees working in Kentucky, answer “yes” and complete Section D with the date wages were first paid and your estimated annual withholding.

Questions 48 through 54 address corporation income tax and limited liability entity tax. These typically apply to C-corps, S-corps, LLCs, and limited partnerships doing business in Kentucky.

Question 42 covers the motor vehicle tire fee. Retailers selling new motor vehicle, trailer, or semitrailer tires in Kentucky owe a $2 per-tire fee. The current statutory authorization runs through July 1, 2026, so check whether the fee has been extended before you register.3Kentucky Department of Revenue. Motor Vehicle Tire Fee

How to Submit the Form

Four options get the completed application to the Department of Revenue:

  • Online through MyTaxes.ky.gov. The Department specifically recommends this route for faster processing. You enter information directly into the portal instead of filling out the PDF. For help, call the Division of Registration at (502) 564-3306.1Kentucky Department of Revenue. Business Registration
  • Mail to Kentucky Department of Revenue, Division of Registration, 501 High Street, Station 20, Frankfort, Kentucky 40602-0299.2Kentucky Department of Revenue. Kentucky Tax Registration Application
  • Fax to (502) 227-0772.
  • Email a scanned copy to DOR.Registration@ky.gov.

Paper applications sent by mail, fax, or email can take up to three weeks to process.1Kentucky Department of Revenue. Business Registration Online registration is significantly faster. If you need to start collecting sales tax or withholding payroll taxes soon, file online.

What Happens After You File

Once the Department processes your application, it mails a notification with your assigned tax account numbers to the address on the form. Those numbers go on every return and payment. If you registered for a sales and use tax permit, Kentucky requires you to keep it displayed at the business location or available for inspection.

Your filing frequency — monthly, quarterly, or annual — reflects the estimated figures you provided. If actual volume comes in much higher or lower, the Department may adjust your frequency later. Returns are due even for periods with no taxable activity; filing a zero-return keeps your account in good standing.

Updating or Canceling Accounts Later

When details change — a new address, a legal name change, added or removed owners, a new tax type, or a business closure — use Form 10A104 (Update or Cancellation of Kentucky Tax Accounts) or make the changes through MyTaxes.ky.gov.4Kentucky Department of Revenue. Additional Tax Registration Information The Data Quality Branch can help at (502) 564-2694.

Don’t let address changes slide. A tax notice sent to an outdated address doesn’t pause penalties or interest while it sits unanswered.

What Happens If You Don’t Register

Operating as a seller in Kentucky without the required sales tax permit is a Class B misdemeanor, and the same charge reaches any officer of a corporation that operates without one.5Kentucky Legislative Research Commission. Kentucky Revised Statutes 139.990 The Department will also assess back taxes, interest, and civil penalties on taxable transactions during the unregistered period.

An LLC or corporation does not shield owners from every tax liability. Kentucky law lets the Department personally assess LLC managers for unremitted individual income withholding under KRS 141.340 and for unremitted sales and use tax under KRS 139.185.6Kentucky Department of Revenue. Limited Liability Company Managers Assessment Sales tax and withholding are trust fund taxes; the money belongs to the state from the moment you collect it, and the people who controlled the business can be held personally liable when it doesn’t get remitted.