Do I Need to Pay Quarterly Estimated Taxes? A Guide for Business Owners & 1099 Workers

September 21, 2026 | TaxOne Financial

If you work for yourself, own a business, freelance, or earn income that doesn’t have taxes automatically withheld, you may have heard that you’re supposed to pay “quarterly taxes.”

But who actually has to pay them? How much should you pay? And what happens if you don’t?

For many business owners and self-employed individuals, estimated taxes can be one of the more confusing parts of managing their finances. Understanding how they work can help you avoid an unexpected tax bill—and potentially penalties—when it’s time to file.

Here’s what you should know.

What Are Quarterly Estimated Taxes?

When you’re a traditional W-2 employee, your employer generally withholds federal income taxes from each paycheck and sends those payments to the IRS throughout the year.

When you’re self-employed or receive certain types of income without sufficient withholding, that usually doesn’t happen automatically.

Instead, you may need to make estimated tax payments throughout the year.

Estimated payments can cover:

• Federal income tax

• Self-employment tax

• Alternative minimum tax, when applicable

• Other taxes you may ultimately owe

Although they’re commonly called “quarterly taxes,” the IRS payment periods aren’t divided into four equal three-month quarters.

Who May Need to Make Estimated Tax Payments?

Estimated taxes aren’t just for large businesses.

You may need to make estimated payments if you’re a:

• Sole proprietor

• Independent contractor

• Freelancer

• Consultant

• Gig worker

• Partner in a partnership

• S corporation shareholder

• Landlord or real estate investor

• Individual receiving significant investment or other income without sufficient withholding

  
  

Generally, individuals may need estimated payments if they expect to owe $1,000 or more in federal tax when filing their return, after accounting for withholding and refundable credits.

Corporations generally use a different threshold and set of rules.

Your actual requirement depends on your individual tax situation.

Why Business Owners Often Get Caught Off Guard?

One of the biggest adjustments when moving from employment to self-employment is realizing that money deposited into your business account isn’t necessarily all yours to spend.

Imagine your business generates $80,000 in net profit during the year.

You don’t necessarily wait until you file your tax return the following spring to begin paying the taxes associated with that income. The federal tax system generally operates on a pay-as-you-go basis.

That’s why we encourage business owners to regularly review their profit and tax position—not just their bank balance.

How Much Should You Pay?

This is where things become more individualized.

Your estimated tax payment isn’t simply a fixed percentage that works for everyone.

Several factors can affect the amount, including:

• Business profit

• Other household income

• Filing status

• Spouse’s income

• Tax withholding from other jobs

• Self-employment tax

• Deductions and credits

• Prior-year tax liability

• Changes in income throughout the year

This is why blindly sending the same amount every quarter can sometimes create problems.

If your business is growing, a payment calculated using older income figures may no longer reflect your current situation.

Likewise, if your income has decreased significantly, your tax projection may need to be reviewed.

What Are the Estimated Tax Deadlines?

For most calendar-year individual taxpayers, the estimated-payment schedule associated with 2026 income is:

April 15, 2026 — First payment

June 15, 2026 — Second payment

September 15, 2026 — Third payment

January 15, 2027 — Fourth payment

Because we’re now in September, the third estimated-tax deadline has passed.

If you were required to make a payment and missed it, don’t automatically assume you should simply wait until January or until you file your tax return. It may be worth reviewing your situation now.

What Happens If You Don’t Pay Estimated Taxes?

If you were required to make estimated payments and didn’t pay enough tax throughout the year, you could potentially owe an underpayment penalty, even if you ultimately pay the balance when you file your return.

However, there are rules that can help taxpayers determine whether enough has been paid during the year.

For many individual taxpayers, one common safe-harbor approach generally involves paying at least:

90% of the tax for the current year, or

100% of the tax shown on the prior year’s return,

whichever applicable amount is smaller.

Certain higher-income taxpayers may need to use 110% of the prior year’s tax instead of 100%.

There are additional requirements and exceptions, so safe-harbor calculations should be applied to the taxpayer’s specific circumstances rather than treated as a universal formula.

What If Your Income Changes Throughout the Year?

This is particularly important for business owners.

Your income may not arrive evenly throughout the year.

You could have a slow first quarter followed by a very strong summer and fall. Or you might land a major contract that significantly changes your expected annual profit.

That’s why estimated-tax planning shouldn’t necessarily be a “calculate it once and forget about it” process.

Reviewing your numbers throughout the year allows you to compare:

What you’ve earned → what you’ve already paid → what you’re projected to owe.

That gives you a much clearer picture of whether adjustments should be considered.

Don’t Forget About Your Bookkeeping

Accurate tax projections depend on accurate financial information.

If your bookkeeping hasn’t been updated in months, it becomes much harder to determine your actual business profit—and therefore much harder to estimate your potential tax liability.

Before calculating estimated payments, business owners should make sure their books accurately reflect their:

• Income

• Deductible business expenses

• Payroll, when applicable

• Major purchases

• Contractor payments

• Other relevant transactions

  
  

Good bookkeeping and proactive tax planning work together.

Don’t Wait Until Tax Season to Find Out

Tax preparation and tax planning serve two different purposes.

Tax preparation looks backward. Tax planning looks forward.

When we prepare a tax return, much of what happened during that tax year has already happened.

Reviewing your tax situation during the year gives you an opportunity to understand where you stand, prepare for upcoming payments, and make informed financial decisions before the year closes.

Need Help Calculating Your Estimated Taxes?

If you’re a business owner, independent contractor, or self-employed professional and aren’t sure whether you’re paying enough in taxes, TaxOne Financial can help.

We can review your year-to-date income, expenses, prior payments, and overall tax situation to help determine what your estimated payments should look like.

Schedule a tax planning consultation with TaxOne Financial Services today.

TaxOne Financial serves individuals and business owners throughout Broward County and South Florida.

This article is intended for general informational purposes and does not constitute individualized tax advice. Estimated-tax requirements vary based on each taxpayer’s circumstances.