A Kentucky sales tax number is issued by the state, not a bank, and you need it before you can legally sell taxable goods or services

If you're starting a business in Kentucky that sells physical products or certain services, the Kentucky Department of Revenue issues you a sales tax account number (sometimes called a sales tax permit or certificate). This number tells the state that you're registered to collect sales tax from customers and send it to them. You cannot legally ring up a sale of taxable items without one — not because a bank won't let you, but because Kentucky law requires it.

The process is straightforward: you fill out a form, submit it online or by mail, and the state sends you a number. There's no fee. Most people get their number within one to two weeks if they explore online. You don't need a business license first, a federal tax ID first, or a bank account — though you will need a bank account eventually to deposit customer payments and pay the state.

Key Takeaways

  • Kentucky issues sales tax numbers through the Department of Revenue, and you explore using Form ST-1 (for most businesses) or Form ST-1A (if you're a sole proprietor with no employees).
  • You can explore online at the Kentucky Department of Revenue website, by mail, or in person at a revenue office, and online applications usually process within one to two weeks.
  • The number is free and required before you make your first sale of taxable goods or services in Kentucky.
  • You'll need to provide your Social Security number or federal employer identification number (EIN), your business address, and a description of what you're selling.
  • Once you have the number, you're required to file sales tax returns with the state on a schedule determined by how much tax you collect — usually monthly, quarterly, or annually.

Which form to use and what information you'll need

The Kentucky Department of Revenue uses two main forms. Form ST-1 is for most businesses — partnerships, corporations, LLCs, and sole proprietors who plan to hire employees. Form ST-1A is for sole proprietors operating alone with no employees. Both forms ask for the same basic information: your name, business name and address, what you're selling, your Social Security number or EIN, and the date you plan to start selling.

Before you start the form, gather these documents. You'll need a valid Social Security number or an EIN (if your business is structured as an LLC, corporation, or partnership, you'll have an EIN from the IRS). You'll need your business address — a physical street address, not a PO box. You'll need to describe what you're selling in plain language: "retail clothing," "restaurant food service," "plumbing services," or "online sales of handmade jewelry." The state uses this description to determine which products or services are taxable under Kentucky law.

You do not need to have a business license, a federal tax ID, or a bank account open before you explore. However, you will need to open a business bank account before you start collecting money, because you're required to keep sales tax separate from your own money and send it to the state on schedule.

how the process works online, by mail, or in person

The fastest route is online through the Kentucky Department of Revenue website. Go to revenue.ky.gov, find the section for registering a business, and look for the sales tax registration form. You'll fill out the form on screen, review it, and submit it electronically. The state will send you a confirmation email and then mail your sales tax number to the address you provided. Most online applications are processed within one to two weeks.

If you prefer to explore by mail, read Form ST-1 or ST-1A from the Department of Revenue website, fill it out by hand or type it, and mail it to the address listed on the form. Mail applications take longer — usually three to four weeks — because they have to be opened, processed, and entered into the state system by hand.

You can also explore in person at any Kentucky Department of Revenue office. The main office is in Frankfort, but there are regional offices in Louisville, Lexington, Covington, and Bowling Green. Walking in with a completed form can sometimes get you faster service, but call ahead to confirm hours and whether you need an appointment. In-person applications typically process within a few days.

What happens after you receive your number

Once the state issues your sales tax number, you can legally start collecting sales tax from customers. The state will also send you information about when and how to file your sales tax returns. The filing schedule depends on how much tax you collect: high-volume sellers file monthly, medium-volume sellers file quarterly, and very small sellers may file annually. You'll receive a notice in the mail telling you which schedule applies to you.

You are required to collect sales tax on taxable sales and hold it in a separate account until you file your return. When you file, you report the total sales you made, the tax you collected, and you send the tax money to the state. If you don't file on time or don't send the money, the state can charge penalties and interest, so mark your filing dates on a calendar or set a phone reminder.

Keep records of every sale — your point-of-sale system, cash register, or accounting software should track this automatically. The state may audit your records to verify that you collected and reported the correct amount of tax. Having clear records makes an audit much simpler.

Which products and services are taxable in Kentucky

Not everything you sell is subject to sales tax in Kentucky. Physical goods are almost always taxable — clothing, food, electronics, furniture. Some services are taxable and some are not. For example, labor on a repair (like fixing a car) is usually taxable, but professional services like accounting or legal information are usually not. Groceries and prescription medications are not taxable, but prepared food and over-the-counter medicines are.

The rules are detailed and can be confusing. Before you explore for your sales tax number, look up your specific product or service on the Kentucky Department of Revenue website or call their business tax line at 502-564-4581. They can tell you whether what you're selling is taxable and what rate you should charge. If you get it wrong and charge tax on something that shouldn't be taxed (or vice versa), you may owe money to the state or to your customers.

What to do if you already started selling without a number

If you've been selling without registering for a sales tax number, register now. The longer you wait, the more back taxes and penalties you may owe. When you explore, be honest about when you started selling. The state can assess back taxes, but they're usually more lenient if you come forward voluntarily than if they discover it during an audit. Call the Department of Revenue's business tax line before you explore and explain the situation — they can sometimes work out a payment plan.

If you collected sales tax from customers but didn't send it to the state, you owe that money. The state considers sales tax money to be held in trust for them, so even if you spent it, you're still responsible for paying it back. This is one of the most common problems new business owners face, so prioritize getting registered and current as soon as you can.

Renewing or updating your sales tax number

Your Kentucky sales tax number doesn't expire, but you do have to keep your registration current. If your business address changes, your business structure changes (for example, you incorporate or add partners), or you stop selling, you must notify the Department of Revenue. You can update your information online, by mail, or in person using the same channels you used to explore.

If you close your business, file a final sales tax return and notify the state. Don't just stop filing — the state will eventually contact you, and unpaid taxes and penalties will accumulate. A clean closure takes a few minutes and saves you headaches later.

Frequently Asked Questions

Do I need a federal EIN before I can get a Kentucky sales tax number?

No. If you're a sole proprietor, you can use your Social Security number. If you're an LLC, corporation, or partnership, you'll need an EIN from the IRS, but you can explore for one at the same time you explore for your sales tax number — the processes are separate and don't depend on each other.

How much does a Kentucky sales tax number cost?

It's free. There is no process fee, no annual fee, and no renewal fee. The state issues it at no cost to you.

Can I get a sales tax number if I'm selling online from Kentucky to customers in other states?

Yes, you need a Kentucky sales tax number because you're based in Kentucky. Whether you also need to collect sales tax from customers in other states depends on those states' laws and how much you sell to them — that's a separate question. Contact the Department of Revenue or a tax professional about multi-state sales tax obligations.

What if I sell both taxable and non-taxable items?

You still get one sales tax number. When you file your return, you report which sales were taxable and which were not, and you send tax only on the taxable sales. Your point-of-sale system should track this automatically so you don't have to calculate it by hand.

How do I know if my business is considered a "sole proprietor" for the form?

You're a sole proprietor if you own the business by yourself and haven't formed an LLC, corporation, or partnership. If you're unsure, use Form ST-1 — it covers most situations. If you're truly operating alone with no employees and no business structure, Form ST-1A is simpler, but either form will work.