IRS Form 1099-K

Business3 min read

Starting a business in the U.S.: the tax basics

Before opening your business, it helps to understand four things: how it files depending on its form, what the EIN is for, which taxes may apply and why you keep the numbers from day one.

B&O Trust Services teamReviewed on · First published on

In 30 seconds

  • For the IRS, a single-member LLC, unless it elects otherwise, is reported on the owner's return.
  • The IRS issues the EIN for free.
  • If you're self-employed, you pay 15.3% for your Social Security and Medicare, in four payments a year.

Your business's form changes how you file

What form you give your business (on your own, LLC or corporation) is a legal and money decision: make it with an attorney or an accountant. What we do explain is how each one files with the IRS, according to the IRS itself (opens in a new tab):

  1. On your own (sole proprietor)

    What the business earns goes on your personal return.

  2. Single-member LLC

    Unless it elects otherwise, the IRS doesn't treat it separately: it goes on the owner's return.

  3. LLC with two or more members

    Unless it elects otherwise, it files as a partnership.

  4. Corporation

    It files separately, with its own forms.

Registering the business: it's done in your state

In Florida you file the Articles of Organization on Sunbiz. The state fee is $125 and every year you file the Annual Report: $138.75, between January 1 and May 1. These are state fees, not our price. We help you open it.

In other states the document, fee and report change. See your state's page.

The EIN: your business number

The EIN (Employer Identification Number) is the number the IRS gives your business. It's used for business taxes, to hire employees and often to open the business bank account. The IRS issues it for free on its website. We help you apply.

Taxes that may apply to you

  • Income tax: federal and, depending on the state, state income tax.
  • Self-employment tax, if the business is yours and you don't draw an employee paycheck.
  • Sales tax, if you sell goods or services that carry it: you register with your state to collect it.
  • Payroll taxes, if you hire employees.

15.3%

That's self-employment tax, according to the IRS: 12.4% for Social Security and 2.9% for Medicare. It applies if your net earnings are $400 or more for the year.

Source: IRS, Self-employment tax (opens in a new tab)

Since nobody withholds it from a paycheck, it's paid in four estimated payments: Apr 15 · Jun 15 · Sep 15 · Jan 15. The dates, with their source.

The numbers, from day one

Open a bank account just for the business, keep your receipts and write down what comes in and goes out every month. That way, in April, the expenses the law allows are ready and none get lost. The IRS generally asks you to keep the records of a return for 3 years.

No receipt, no expense

An expense you can't prove is an expense that doesn't count. We do your bookkeeping so nothing gets lost.

Official sources

  1. IRSLLC: how the IRS treats them (opens in a new tab)
  2. IRSGet an EIN (opens in a new tab)
  3. IRSSelf-employment tax (opens in a new tab)
  4. IRSEstimated tax (opens in a new tab)
  5. Florida SenateFlorida Statutes 605.0213 (LLC filing fee) (opens in a new tab)
  6. Florida SenateFlorida Statutes 607.193 (Annual Report) (opens in a new tab)
  7. Florida Department of RevenueFlorida sales and use tax (opens in a new tab)

Checked on October 8, 2026. General information about business taxes. Not legal advice: decide your company's form with an attorney or an accountant.

Keep reading

All guides

We're in Doral

Shall we go over it
together?

Message us on WhatsApp or call us. Monday to Friday, 8:00 a.m. – 6:00 p.m.