If you earn money that does not have enough federal tax withheld from it, you may have heard that you need to make estimated tax payments to the IRS.
That can lead to plenty of questions:
What are estimated tax payments? Why do I need to pay taxes before I file my return? How much am I supposed to pay? And what happens if I don’t make them?
The answer starts with an important feature of the U.S. tax system: federal taxes operate on a pay-as-you-go basis.
In other words, the IRS generally expects taxpayers to pay taxes throughout the year as they earn or receive income—not wait until tax season to pay everything at once. Taxes are typically paid during the year through payroll withholding, estimated tax payments, or a combination of both.
For employees, this often happens automatically through the federal income tax withheld from each paycheck.
For business owners, freelancers, investors, landlords, and others who receive income without sufficient withholding, estimated tax payments may take the place of– or supplement– that paycheck withholding.
Here is what you need to know.
What Are Estimated Tax Payments?
Estimated tax payments are payments made toward your expected federal tax liability during the year.
You can think of them as prepayments toward the taxes you expect to owe when you eventually file your federal income tax return.
The government does not generally want taxpayers to earn untaxed income throughout the year and then pay the entire balance the following April. Instead, the pay-as-you-go system is designed to collect tax as income is earned or received.
Estimated tax is commonly used for income that is not subject to federal withholding.
It can also be used to cover more than federal income tax. The IRS notes that estimated payments may include other taxes, such as self-employment tax and alternative minimum tax, when applicable.
Why Do W-2 Employees Usually Not Make Estimated Tax Payments?
If you work as an employee and receive a W-2, your employer generally withholds federal income tax from your paycheck.
That withholding is already being paid toward your federal tax liability throughout the year.
For many taxpayers whose income comes primarily from W-2 wages—and whose employers are withholding an appropriate amount—separate estimated tax payments are therefore not necessary.
However, having a W-2 does not automatically mean you will never need estimated payments.
You may still need additional tax payments if:
- Not enough federal income tax is being withheld from your paycheck
- You have significant income from another source
- You operate a side business
- You receive investment or rental income
- Your financial situation changes during the year
The IRS specifically notes that taxpayers who receive wages can sometimes avoid separate estimated payments by asking an employer to withhold additional federal tax through a new Form W-4.
That can be a useful option for someone who has both a traditional W-2 job and income from another source.
Who May Need to Make Estimated Tax Payments?
Estimated taxes are especially common when income is received without withholding.
You may need to make estimated payments if you receive income such as:
- Self-employment earnings
- Freelance income
- Independent contractor income
- Gig economy income
- Rental income
- Interest
- Dividends
- Capital gains
- Certain taxable retirement income
- Other income that is not adequately covered by withholding
The IRS identifies self-employment income, interest, dividends, rents, capital gains, and other income without sufficient withholding as common reasons taxpayers may need estimated payments.
Business Owners and Self-Employed Taxpayers
Estimated payments are particularly common among people who work for themselves.
This can include:
- Sole proprietors
- Freelancers
- Independent contractors
- Partners
- Certain S corporation shareholders
- People earning income through a side business
Unlike a traditional employee, a self-employed person typically does not have an employer automatically withholding federal tax from every payment received.
The IRS states that individuals—including sole proprietors, partners, and S corporation shareholders—generally need to make estimated tax payments when they expect to owe at least $1,000 when they file their return.
Can I Need Estimated Taxes Even If I Have a Regular Job?
Yes.
Suppose you work full time and receive a W-2, but you also earn significant money through consulting, freelance work, rental property, investments, or another side business.
Your employer may be withholding enough tax to cover your paycheck– but not enough to cover the tax associated with your additional income.
In that situation, you may have two options:
- Make estimated tax payments during the year, or
- Increase the amount withheld from your W-2 paycheck
The IRS confirms that taxpayers who receive wages may increase their federal withholding by filing a new Form W-4 with their employer.
Your tax professional can help you determine which approach makes the most sense for your circumstances.
How Do I Know If I Have to Make Estimated Tax Payments?
This is where the IRS guidelines become especially important.
Generally, you must make estimated tax payments if both of the following conditions apply:
1. You expect to owe at least $1,000.
You expect to owe at least $1,000 in tax for the current year after subtracting your federal withholding and refundable credits.
And:
2. Your withholding and refundable credits will not cover enough of your tax.
You expect your withholding and refundable credits to be less than the smaller of:
- 90% of the tax shown on your current-year tax return, or
- 100% of the tax shown on your prior-year tax return
For certain higher-income taxpayers, that second figure becomes 110% of the prior year’s tax instead of 100%.
If your adjusted gross income for the prior year was greater than $150,000, or $75,000 if married filing separately, the IRS generally uses 110% of the prior year’s tax for this rule. Your prior-year tax return must cover a full 12-month period.
These rules are often referred to as estimated tax safe-harbor rules because paying enough under one of these guidelines can generally help you avoid an underpayment penalty.
Special rules apply in certain situations, including some taxpayers with farming or fishing income and other specific circumstances.
A Simple Estimated Tax Example
Imagine that you are self-employed and expect to owe $12,000 in federal taxes for the year after considering the tax information that applies to your situation.
Because there is no employer automatically withholding that amount from a paycheck, waiting until tax season to pay the entire $12,000 could create both a significant cash-flow problem and the potential for an underpayment penalty.
Instead, estimated payments allow you to pay toward that expected liability throughout the year.
The exact amount you should pay depends on your expected income, deductions, credits, taxes, withholding, and prior-year information.
That is why estimated tax payments should be calculated, rather than simply choosing an arbitrary amount and sending it to the IRS.
How Are Estimated Tax Payments Calculated?
Individuals generally use Form 1040-ES, Estimated Tax for Individuals, to calculate estimated payments.
To estimate your tax for the year, you may need to project:
- Adjusted gross income
- Taxable income
- Deductions
- Tax credits
- Self-employment tax, if applicable
- Other applicable federal taxes
- Federal income tax withholding
- Expected annual tax liability
Your prior-year return can be a helpful starting point, but your current year’s financial situation also matters.
The IRS specifically recommends adjusting estimates when income, deductions, credits, personal circumstances, or tax laws change.
That means estimated payments do not necessarily have to remain the same all year if your financial circumstances change significantly.
When Are Estimated Tax Payments Due?
People often call these quarterly estimated tax payments, although the IRS technically divides the calendar year into four payment periods.
For the 2026 tax year, the estimated tax payment dates are:
- April 15, 2026 – First payment
- June 15, 2026 – Second payment
- September 15, 2026 – Third payment
- January 15, 2027 – Fourth payment
The payment periods are not four perfectly equal three-month quarters, which is why it is useful to pay attention to the actual IRS dates rather than simply assuming a payment is due every three months.
If an applicable due date falls on a weekend or legal holiday, IRS rules generally move the timely-payment date to the next business day.
Do Estimated Payments Have to Be Exactly Equal?
Not always.
Some taxpayers earn approximately the same amount throughout the year, making relatively even payments practical.
Others have highly irregular income.
For example, a real estate professional, contractor, consultant, seasonal business owner, or investor might earn much more income during one part of the year than another.
The IRS provides an annualized income installment method that may allow taxpayers with uneven income to calculate payments based more closely on when income was actually received. Form 2210 and Schedule AI may be involved when this method is used.
This is one area where working with a tax professional can be particularly helpful.
What Happens If I Don’t Make Estimated Tax Payments?
If you were required to pay tax during the year and did not pay enough– or paid too late– you may face an underpayment of estimated tax penalty.
The IRS can assess the penalty when taxpayers do not pay enough through withholding and estimated payments. A penalty may also apply when estimated payments are made late.
An important detail is that timing matters.
You cannot always wait until the end of the year, make one large estimated payment, and assume everything will be treated exactly as though the payments had been made throughout the year.
The IRS evaluates estimated tax using specific payment periods, and a taxpayer may potentially face a penalty for not paying enough by the applicable due date– even if the taxpayer eventually receives a refund when the return is filed.
Estimated Payments Can Help Prevent IRS Penalties
One of the biggest reasons to stay current with estimated taxes is to reduce the risk of an IRS underpayment penalty.
Generally, most taxpayers can avoid the penalty if:
- They owe less than $1,000 after subtracting applicable withholding and credits, or
- They paid enough during the year to satisfy the applicable current-year or prior-year safe-harbor requirements
For many taxpayers, that means paying at least 90% of the current year’s tax or 100% of the previous year’s tax, whichever applicable amount is smaller. The 110% prior-year rule applies to certain higher-income taxpayers as described above.
Making estimated payments can also make tax season easier because you are spreading the expected tax liability across the year rather than trying to come up with the entire amount when your return is due.
Estimated Taxes Can Help With Cash Flow
There is another practical reason to make estimated payments: cash-flow management.
Suppose your business is profitable and you put all the money flowing into your account toward personal expenses, inventory, equipment, travel, or business growth.
When April arrives, you may discover that a significant portion of that money should have been reserved for taxes.
Even when there is no penalty issue, a large unexpected tax balance can be difficult to manage.
Making payments throughout the year encourages you to account for taxes as part of your regular budget instead of treating your tax bill as a once-a-year expense.
For self-employed taxpayers and business owners, it can be helpful to think of tax money as money that should be planned for– not simply as extra cash available to spend.
What If My Income Changes During the Year?
Estimated payments are based on projections, and projections can change.
Maybe your business earns significantly more than expected.
Maybe a large client leaves.
Maybe you sell an investment and realize a substantial capital gain.
Maybe you start a side business halfway through the year.
Or perhaps your spouse changes jobs and the household’s withholding changes.
The IRS allows taxpayers to recalculate estimated payments when their expected income changes. Form 1040-ES can be used to revise the estimate for the remaining payment periods.
That is one reason reviewing your tax situation during the year can be valuable.
The estimate you calculated in April may no longer make sense by September.
Can I Increase My Withholding Instead?
For some taxpayers, yes.
If you receive W-2 wages, you can potentially increase the amount of federal income tax withheld from each paycheck by submitting an updated Form W-4 to your employer.
That additional withholding can help cover tax associated with other income.
The IRS specifically notes that taxpayers with wages may be able to avoid separate estimated payments by increasing paycheck withholding.
Similarly, taxpayers receiving certain pension or annuity payments may have withholding options available from those payments.
Whether increased withholding or separate estimated payments makes more sense depends on your particular income sources and circumstances.
How Can I Pay Estimated Taxes to the IRS?
The IRS provides several ways to make estimated payments.
Taxpayers can generally pay:
- Online through IRS payment options
- Through an IRS Online Account
- By phone
- Through supported IRS mobile payment options
- By mail with the appropriate Form 1040-ES payment voucher
The IRS also notes that you are not necessarily required to physically send a payment exactly four times per year. You may make payments more frequently– such as monthly– as long as enough has been paid by the applicable payment-period deadline.
Whichever payment method you use, maintain good records.
Keep confirmation numbers, payment dates, amounts, and information showing which tax year the payment was intended to cover. You will need the total estimated payments made during the year when preparing your tax return.
Common Reasons Estimated Tax Payments Get Off Track
Estimated taxes often become a problem because taxpayers understandably focus on the income coming in rather than the tax that will eventually be associated with it.
Common situations include:
- Starting a profitable side business
- Moving from W-2 employment into self-employment
- Receiving a large 1099
- Having a much better business year than expected
- Selling an investment for a significant gain
- Receiving more rental income
- Reducing paycheck withholding
- Forgetting an estimated payment deadline
- Continuing to use an estimate after income has changed substantially
None of these situations automatically means you have a tax problem.
They are simply good reasons to revisit the amount being paid during the year.
Why Year-Round Tax Planning Matters for Estimated Payments
Estimated taxes are a good example of why tax planning should not begin and end with filing a return.
If you wait until tax season to discover what you owe, the year is already over.
By reviewing your income during the year, your tax professional can compare what you have already paid with what you may expect to owe.
That conversation may include:
- Current business profit
- Self-employment income
- W-2 withholding
- Investment gains
- Rental income
- Retirement distributions
- Estimated tax payments already made
- Expected deductions
- Expected credits
- Changes in household income
The goal is not to predict the future perfectly.
It is to make a reasonable calculation using the information available and adjust the plan when circumstances change.
Get Help Calculating Your Estimated Tax Payments
Estimated tax payments exist because the U.S. tax system generally requires taxes to be paid as income is earned.
For taxpayers whose taxes are already adequately covered by W-2 withholding, separate payments may not be necessary. But if you are self-employed, own a business, earn freelance or rental income, receive significant investment income, or simply do not have enough tax withheld from your paycheck, estimated payments may become an important part of your tax plan.
Making the right payments at the right time can help you:
- Meet the IRS pay-as-you-go requirements
- Reduce the risk of underpayment penalties
- Avoid a large and unexpected tax bill
- Manage cash flow more effectively
- Stay organized throughout the year
- Plan ahead rather than react at filing time
You do not have to guess what those quarterly payments should be.
Matterhorn Tax Planning can review your expected income, withholding, deductions, credits, and prior-year tax information to help determine whether you need estimated tax payments and what those payments should be.
Contact the Matterhorn Tax Planning team to review your estimated taxes and create a payment strategy for the year ahead.