Estimated Tax Payments 101: The Simple Guide to Quarterly Taxes (And How to Skip the Penalty)

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Executive Summary for the Taxpayer
If you owed $1,000 or more when you filed last year, that is a strong warning that your current withholding may not be enough, especially if you earn money through self-employment, freelance work, rentals, or a side business. You can generally stay ahead of the IRS by making estimated payments or increasing withholding from a paycheck, while meeting the applicable safe-harbor amount. IRS Estimated Tax FAQ

Estimated tax is a pay-as-you-go system

Employees often pay federal income tax throughout the year through payroll withholding. When you are self-employed or receive income without withholding, you may need to send payments directly to the IRS during the year instead. IRS Publication 505

Estimated tax can cover:

  • Federal income tax
  • Self-employment tax
  • Additional Medicare Tax, when applicable
  • Net Investment Income Tax, when applicable
  • Other taxes reported on your individual return IRS Publication 505

The important point is timing. Waiting until you file your tax return may leave you with both a large balance due and an underpayment penalty for missing earlier payment periods. IRS Estimated Tax FAQ

Who should be thinking about estimated payments

Estimated tax commonly applies to people whose income is not subject to enough federal withholding, including:

  • Sole proprietors and other self-employed individuals
  • Freelancers and independent contractors
  • Gig workers receiving Forms 1099-NEC or other income statements
  • Real estate agents
  • Landlords receiving rental income
  • Online sellers and side-hustlers
  • Investors with substantial interest, dividends, or capital gains
  • Partners receiving income through a partnership
  • Anyone with a new source of taxable income without withholding IRS Form 1040-ES

A Form 1099 does not mean tax was already paid on your behalf. It generally reports income to you and the IRS, but it usually does not include federal income tax withholding. IRS Publication 505

If you owed $1,000 or more with last year’s return, do not treat that as a bill that only applied to last year. Treat it as a signal to review your current-year withholding and estimated payments. The formal IRS test looks at what you expect to owe for the current year after withholding and refundable credits, along with whether you are meeting the required annual payment threshold. IRS Estimated Tax FAQ

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The four 2026 estimated-tax due dates

For most calendar-year individual taxpayers, the IRS divides the year into four payment periods. The payment dates do not divide the year into four equal three-month quarters, which is why the second payment comes due on June 15 and the third payment comes due on September 15. IRS Publication 505

2026 payment period General due date
January 1 through March 31 April 15, 2026
April 1 through May 31 June 15, 2026
June 1 through August 31 September 15, 2026
September 1 through December 31 January 15, 2027

The third-quarter payment is due September 15, 2026. A payment due date that falls on a Saturday, Sunday, or legal holiday generally moves to the next business day. IRS Estimated Tax FAQ

You may not need to make the January 15, 2027 payment if you file your 2026 Form 1040 or Form 1040-SR by January 31, 2027 and pay the remaining tax due with the return. That exception does not erase possible penalties for earlier missed or insufficient installments. IRS Publication 505

If you did not receive taxable income subject to estimated tax until later in the year, your first required payment may begin with the later payment period. Special rules also apply to fiscal-year taxpayers, farmers, and fishers. IRS Publication 505

How much should you pay

The IRS provides Form 1040-ES and its worksheets to calculate estimated tax. A basic calculation generally requires you to project:

  1. Total income, including business, rental, investment, and wage income
  2. Adjustments to income
  3. The standard deduction or expected itemized deductions
  4. Qualified business income deductions, when applicable
  5. Income tax
  6. Self-employment tax
  7. Expected credits and other taxes
  8. Federal income tax withholding already made or expected during the year IRS Form 1040-ES

Your prior-year return is a useful starting point, but it should not be copied without review. Changes in income, filing status, dependents, business expenses, rental activity, deductions, credits, or tax law can materially change the result. IRS Publication 505

A common safe-harbor approach is to prepay the smaller of:

  • 90% of your expected current-year tax, or
  • 100% of the total tax shown on your prior-year return

If your prior-year adjusted gross income was more than $150,000, or $75,000 if married filing separately, the prior-year percentage is generally 110% instead of 100%. IRS Estimated Tax FAQ

The safe harbor can help you avoid an underpayment penalty even if you still owe a balance when filing. It does not mean your total tax liability is reduced, and it does not necessarily mean you will receive a refund. IRS Form 1040-ES

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You may be able to increase paycheck withholding instead

Estimated payments are not the only solution. If you or your spouse receives wages, you may be able to submit a new Form W-4 and request an additional amount of federal income tax withholding from each paycheck. IRS Publication 505

This can be useful when:

  • You have a W-2 job and a growing side business
  • Your spouse has wages that can absorb additional withholding
  • Your freelance or rental income changes throughout the year
  • You are catching up after an earlier missed payment
  • You prefer payroll withholding instead of separate IRS payments

The IRS treats withholding differently from estimated payments for certain timing purposes. Withholding may be treated as paid throughout the year, which can make a late-year withholding adjustment helpful in some situations. The calculation still needs to be accurate for your facts. IRS Publication 505

You can use the IRS Tax Withholding Estimator as a starting point. For business owners, freelancers, and landlords with multiple income sources, a complete projection is often more reliable than relying on one paycheck estimate.

What happens if you do not pay enough

The IRS may impose an underpayment of estimated tax penalty when your withholding and estimated payments are not sufficient by the applicable payment dates. This can happen even if you pay the entire balance when you file and even if your return ultimately shows a refund. IRS Estimated Tax FAQ

The penalty is generally determined by payment period. Paying a large amount at the end of the year may not fully correct an earlier underpayment because the IRS reviews whether enough was paid by each required due date. IRS Publication 505

Form 2210, Underpayment of Estimated Tax by Individuals, Estates and Trusts, is used to determine whether the penalty applies and, when necessary, calculate the amount. The form also includes methods that may reduce the penalty when income was uneven during the year. IRS Form 2210

You may have an exception or penalty reduction based on circumstances such as:

  • Meeting a safe harbor
  • Having no tax liability for the prior year and satisfying the other IRS requirements
  • Receiving income unevenly during the year
  • Qualifying for a special farming or fishing rule
  • Experiencing certain casualty, disaster, or unusual circumstances IRS Publication 505

Variable income requires a flexible plan

Equal quarterly payments are easiest when income is reasonably consistent. They may not be appropriate for a seasonal landlord, summer business, commission-based real estate agent, or freelancer whose income arrives in large, irregular payments. IRS Publication 505

In those cases, the annualized income installment method may allow payments to reflect when income was actually earned. This method uses the Annualized Estimated Tax Worksheet in Publication 505, and you may need to attach Schedule AI to Form 2210 when filing. IRS Publication 505

A practical review schedule is:

  1. Start with your most recent federal tax return.
  2. Estimate current-year gross income and deductible expenses.
  3. Include self-employment tax, not only income tax.
  4. Compare expected tax with withholding and prior estimated payments.
  5. Make the next payment by the applicable due date.
  6. Revisit the projection after a major change in income or expenses.

Do not reduce estimated payments simply because a client, platform, or tenant did not send a Form 1099. Taxable income generally must be reported whether or not an information return is received. IRS Publication 505

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How to make an estimated payment

The IRS offers several payment methods, including:

When paying online, select the correct tax year and payment type. Keep the confirmation number and payment record with your tax files. Estimated payments are reported on Form 1040, line 26, when you file your individual return. IRS Estimated Tax FAQ

How Brick Taxes can help

Estimated tax planning is more than dividing a number by four. Brick Taxes can review your prior return, current income, business expenses, rental activity, withholding, and prior payments to build a practical payment schedule.

Our federally licensed Enrolled Agent can help you:

  • Determine whether estimated payments are required
  • Calculate a current-year projection
  • Compare estimated payments with increased Form W-4 withholding
  • Review safe-harbor options
  • Account for self-employment tax
  • Adjust payments when income changes
  • Evaluate annualized income installments
  • Address an underpayment notice or other IRS matter

You can review Brick Taxes’ tax preparation pathways, see the service fee guide, or contact Brick Taxes through the firm’s main website.

If last year’s return showed a balance of $1,000 or more, do not wait until next filing season to review your plan. Set up your estimated payments or withholding strategy before the next applicable deadline, including September 15, 2026 for the third payment period.

Official Authorities Referenced

Categories: Quarterly Taxes; Business / Small Business