INDIVIDUAL AND SMALL BUSINESS CPA
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We are a boutique firm providing tax preparation, proactive planning, and full-service bookkeeping for individuals and small businesses—delivered through a high-touch process that makes complex numbers clear and decisions easier.
Estimated Tax Payments:
What You Need to Know
The U.S. tax system is generally designed to collect income tax throughout the year, not only when a tax return is filed. This is often referred to as a “pay-as-you-go” system. In other words, as income is earned or received, the IRS expects tax to be paid along the way.
For many taxpayers, this happens automatically through payroll withholding. If you are a W-2 employee, your employer withholds federal income tax from each paycheck and sends those payments to the IRS on your behalf. However, payroll withholding is only one way tax is paid during the year, and it may not cover your full tax liability if you have multiple income sources, a spouse with income, investment activity, business income, or other changes to your tax situation.
Estimated tax payments are used when income is not fully covered by withholding. This often includes business or 1099 income, investment income, capital gains, rental income, retirement income, or other income where little or no tax is withheld automatically.
Estimated tax payments are not an additional tax. They are a method of paying your expected annual tax liability throughout the year. Making timely payments can help reduce surprises at filing, improve cash flow planning, and lower the risk of IRS underpayment penalties.
This guide explains when estimated tax payments may be needed, how the IRS underpayment penalty works, when payments are due, how payments are made, and when it may make sense to request an updated calculation.
1. What Are Estimated Income Tax Payments?
2. Who Should Consider Estimated Tax Payments?
3. Why Should I Pay Quarterly Estimates?
4. How Much Taxes Should I Be Paying During the Year?
5. What Is an Underpayment Penalty?
6. Why Withholding Can Be Different From Estimated Payments
7. When Are Quarterly Estimated Taxes Paid?
8. How Are Estimated Taxes Paid?
9. Should I Make Estimated Payments or Increase Withholding?
10. The Parks Tax Process for Estimated Tax Payments
11. The Importance of the 3rd Quarter Estimate
12. When Should I Request an Estimated Tax Calculation or Update?
What are estimated income tax payments?
Estimated income tax payments are periodic tax payments made during the year to cover income that is not fully covered by withholding.
For individuals, these payments are generally made four times per year. Although they are often called “quarterly estimates,” the IRS payment periods are not equal calendar quarters, and the due dates are not evenly spaced.
Estimated payments may be made for federal income tax, self-employment tax, and in some cases state income tax. The amount needed depends on your projected income, deductions, credits, withholding, and prior-year tax liability.
In short, estimated payments are a planning tool. They help taxpayers stay current during the year instead of waiting until the tax return is filed to address the full tax liability.
Who should consider estimated tax payments?
You may need estimated tax payments, or a review of your current estimates, if one or more of the following applies to you:
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You are self-employed or own a business.
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You receive 1099 income.
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You regularly owe a balance when your tax return is filed.
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You expect a new source of income this year.
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You expect a significant change to an existing source of income.
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You have investment income, such as interest, dividends, or capital gains.
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You have rental income.
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You receive retirement benefits or taxable Social Security benefits.
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You received a large bonus, distribution, stock sale, business sale, or other one-time income event.
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You are concerned that your current withholding may not be enough.
The need for estimated payments is not limited to business owners. Anyone with income that is not fully covered by withholding may need to evaluate whether estimated payments are appropriate.
Why should I pay quarterly estimates?
Quarterly estimated payments help you pay tax throughout the year instead of waiting until your tax return is filed. This matters for two main reasons.
First, estimated payments can help reduce the risk of a large, unexpected balance due at filing. If income is earned throughout the year but no tax is paid on that income until the return is filed, the final balance can be much larger than anticipated.
Second, the IRS may assess an underpayment penalty if enough tax is not paid in by the applicable due dates. This penalty can apply even if you are ultimately due a refund when your tax return is filed.
In other words, estimated payments are not only about whether you will owe when you file. They are also about when the IRS expected the tax to be paid.
How much in taxes should I be paying through the year?
There are two different goals to keep in mind when reviewing estimated tax payments:
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Penalty protection — paying enough during the year to avoid or reduce IRS underpayment penalties.
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Cash flow planning — paying enough during the year to avoid a large balance due when your return is filed.
For many individual taxpayers, the IRS safe harbor rules generally allow you to avoid an underpayment penalty if you pay in at least the lower of:
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90% of your current-year tax liability, or
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100% of your prior-year tax liability.
However, the prior-year safe harbor amount depends on your adjusted gross income, commonly referred to as AGI.
If your prior-year AGI was $150,000 or less, you generally need to pay in at least 100% of your prior-year tax liability to use the prior-year safe harbor.
If your prior-year AGI was more than $150,000, you generally need to pay in at least 110% of your prior-year tax liability to use the prior-year safe harbor. For taxpayers who are married filing separately, this higher-income threshold generally applies when prior-year AGI was more than $75,000.
Stated another way:
PRIOR-YEAR AGI
PRIOR-YEAR SAFE HARBOR AMOUNT
$150,000 or less
100% of prior-year tax
More than $150,000
110% of prior-year tax
Married filing separately and more than $75,000
110% of prior-year tax
These safe harbor rules are penalty-protection rules. Meeting a safe harbor may help you avoid an underpayment penalty, but it does not necessarily mean you will not owe tax when your return is filed.
For example, if your income increases significantly during the year, paying based on last year’s tax may protect you from penalties, but you could still have a balance due with your return.
You generally are not required to make federal estimated tax payments if you expect to owe less than $1,000 after subtracting withholding and refundable credits. Corporations generally have separate rules and may need to make estimated tax payments if they expect to owe $500 or more when the return is filed.
What Is an underpayment penalty?
An underpayment penalty may apply if you do not pay enough tax during the year through withholding and estimated tax payments.
The IRS generally determines whether you paid enough by comparing your payments to the applicable safe harbor threshold. That required amount is then evaluated across the four estimated tax due dates. If enough tax was not paid in by a required due date, an underpayment may exist for that period.
The penalty is computed similarly to interest. It is based on:
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the amount underpaid,
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the IRS underpayment interest rate, and
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the length of time the underpayment remained outstanding.
The IRS underpayment rate is set quarterly and generally compounds daily.
Why withholding can be different from estimated payments
Withholding and estimated tax payments are both ways to pay tax during the year, but they are treated differently for penalty purposes.
Withholding is generally treated as paid evenly throughout the year, even if the withholding occurs later in the year. For this reason, increasing withholding can sometimes be an effective way to reduce underpayment penalty exposure, especially compared to making late estimated tax payments. This is often relevant for taxpayers who receive wages, retirement distributions, or other income where withholding can be adjusted.
Estimated tax payments, on the other hand, are generally credited when they are actually paid. A late estimated payment may help reduce the final balance due, but it may not fully eliminate an underpayment penalty for an earlier period.
When are quarterly estimated taxes paid?
IRS estimated tax payment periods are not equal calendar quarters, which is why the due dates are not spaced evenly.
Federal individual estimated tax payments are generally due as follows:
If a due date falls on a weekend or federal holiday, the deadline generally moves to the next business day.
State estimated tax payment rules and deadlines may differ from federal rules.
How are estimated taxes paid?
We generally recommend paying federal estimated taxes electronically. Electronic payments are usually the fastest and most reliable way to make payments, track confirmation details, and reduce the risk of mailing delays or processing issues.
Common federal payment options include:
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IRS Direct Pay: Pay directly from a checking or savings account for free. This is often the simplest option for individual estimated tax payments.
Pay through IRS Direct Pay -
IRS Online Account: Make payments, schedule payments, view payment history, and review certain IRS account information.
Access your IRS Online Account -
EFTPS: The Electronic Federal Tax Payment System allows taxpayers to schedule and manage federal tax payments online or by phone. Enrollment is required before use.
Pay through EFTPS
Learn more about EFTPS from the IRS -
Debit card, credit card, or digital wallet: The IRS allows payments through approved third-party processors. Processing fees apply.
Pay by card or digital wallet
When making an estimated tax payment, it is important to select the correct tax year and payment type. For example, a current-year estimated tax payment should not be coded as a prior-year balance due payment.
We recommend saving confirmation numbers and payment receipts for your records. These should also be uploaded to your portal for use in preparation of your tax return for the upcoming season.
State estimated tax payments are usually made separately through the applicable state tax agency. For state payments, use the payment portal for the state where the estimate is due and confirm that the payment is applied to the correct tax year and payment type.
Should I make estimated payments or increase withholding?
The answer depends on your income sources, timing, and cash flow. Estimated tax payments may make sense if you have income that is not subject to withholding, such as business income, rental income, investment income, or capital gains. Increasing withholding may make sense if you have wages, retirement distributions, or other income where withholding can be adjusted. Because withholding is generally treated as paid evenly throughout the year, this can sometimes be a useful planning tool. In some situations, a combination of estimated payments and increased withholding may be appropriate.
The Parks Tax process for estimated tax payments
At Parks Tax, estimated tax recommendations are part of our broader tax planning process. When appropriate, we proactively include a safe harbor estimate when we deliver your prior-year tax return. This gives clients a baseline payment recommendation for the upcoming tax year based primarily on prior-year tax information.
A safe harbor estimate is designed primarily for penalty protection. In other words, it helps determine the amount generally needed to reduce or avoid IRS underpayment penalties. However, a safe harbor estimate does not necessarily mean that you will not owe tax when your return is filed. If your income increases, your withholding decreases, or your tax situation changes during the year, you may still have a balance due even if you paid the recommended safe harbor amounts.
Because a safe harbor estimate is based largely on prior-year information, it may not fully reflect what happens during the current year. For that reason, quarterly estimate check-ins are used to determine whether your original estimate still makes sense or whether an updated calculation may be needed.
Annual Safe Harbor Estimate Provided With Your Tax Return
When we prepare your tax return, we review whether estimated tax payments appear to be recommended for the following year. If so, we may include estimated tax payment vouchers, payment instructions, or other estimate guidance with your completed return.
These estimates are generally based on safe harbor rules using your prior-year tax liability. This approach gives you a structured payment plan for the next tax year without requiring a full current-year projection each quarter.
This annual safe harbor estimate is often sufficient for clients whose income, withholding, deductions, and overall tax profile are relatively consistent from year to year.
Quarterly Estimate Check-Ins
In addition to the annual safe harbor estimate, we may send quarterly reminders before upcoming estimated tax payment deadlines. These reminders are intended to help clients determine whether an updated estimate calculation is needed.
For most clients, if we believe you should be making estimated tax payments, we likely communicated that recommendation when your tax return was delivered or through a prior estimate discussion. The quarterly check-in is your opportunity to let us know if something has changed or if you would like us to calculate an updated estimate for that quarter.
If you do not want an updated estimate calculated, no action is generally required unless your email from us says otherwise. If you do not want to receive quarterly estimate inquiry emails going forward, you may let us know and we can remove you from that distribution list.
Clients on Recurring Advisory or Bookkeeping Packages
If you are a client on a recurring bookkeeping package or a Plan & Advise monthly subscription package, our team will generally reach out automatically to collect the information needed for your estimate calculation. In that case, no action is needed in response to the general quarterly reminder email unless we specifically request information from you.
Clients Not on a Recurring Package
For clients who are not on a recurring bookkeeping or monthly advisory package, updated quarterly estimate calculations are available upon request. If you would like us to calculate or update your estimated tax payment for the quarter, you must reply by the deadline provided in the quarterly reminder email. For these clients, quarterly estimate calculations are billed at the applicable hourly consulting rates outlined in your engagement letter.
Information We May Request
To calculate an updated estimate, we need current-year information. Our team will review your prior-year tax return and request the relevant information through the client portal.
Depending on your situation, we may ask for:
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recent paystubs,
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year-to-date business income and expenses,
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updated bookkeeping records,
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current brokerage statements or realized gain/loss estimates,
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rental income and expense updates,
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retirement distribution information,
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details about large or unusual income items,
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withholding changes,
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updated deduction information, and
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any other tax updates that may affect your projected tax liability.
Timing Is Important
The quarterly estimate process is highly time-sensitive because there is a short window between the end of the payment period, the information submission deadline, and the estimated tax payment deadline.
Timely submission of requested information is critical. If requested information is not submitted by the stated deadline, we may not be able to complete the estimate before the payment due date.
Although we try to provide as much notice as possible, estimate recommendations may be delivered close to the payment deadline. Please monitor your email and client portal closely during the estimate window so you do not miss follow-up questions, document requests, or final payment instructions.
What an Updated Estimate Provides
An updated estimate is designed to help determine whether an additional payment is recommended for the quarter based on the information available at that time.
Depending on your situation, the recommendation may consider:
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current-year projected tax liability,
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prior-year safe harbor rules,
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year-to-date withholding,
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prior estimated payments,
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changes in income or deductions,
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investment activity,
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business or rental activity, and
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expected activity for the remainder of the year.
The goal is to help you stay current, reduce the risk of underpayment penalties, and plan for cash flow before your tax return is filed.
Important Limitation
Estimated tax calculations are based on the information available when the estimate is prepared. If your income, deductions, withholding, investment activity, or other tax facts change after the estimate is calculated, your final tax liability may differ from the projection.
For this reason, estimates may need to be updated during the year, especially if you experience a significant income event or financial change.
The Importance of the 3rd Quarter Estimate
If you are interested in a limited number of estimated tax calculations during the year, we strongly recommend prioritizing the 3rd quarter estimate.
This timing gives us a meaningful opportunity to review your current-year tax position before year-end. By the 3rd quarter, there is usually enough information available to evaluate income, withholding, deductions, investment activity, and other major tax items, while still leaving time to implement tax-saving strategies before December 31.
This may include planning around withholding, retirement contributions, tax-loss harvesting, charitable giving, business deductions, entity-level tax elections, timing of income or expenses, or other year-end planning opportunities.
Parks Tax generally completes Q4 and year-end estimate work during October and November. January is a busy compliance period for small business year-end close, payroll tie-outs, Forms 1099, and other reporting obligations. More importantly, waiting until after year-end is not consistent with our proactive approach, because many planning opportunities are no longer available once the year has ended.
The 3rd quarter estimate is often the best opportunity to combine penalty protection, cash flow planning, and proactive tax strategy before the year is over.
When Should I Request an Estimated Tax Calculation or Update?
You should consider requesting an estimated tax calculation if you are unsure whether your current withholding and estimated payments are enough to cover your expected tax liability for the year.
This may be appropriate if you:
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consistently owe a balance when your tax return is filed,
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are self-employed or receive significant 1099 income,
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own a business or receive income from an entity,
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have rental income,
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receive significant investment income, dividends, interest, or capital gains,
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sold investments, real estate, business assets, or other appreciated property,
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received a large bonus, retirement distribution, stock compensation, or other unusual income item,
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started or stopped a business,
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started or stopped a job,
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had a significant increase or decrease in income,
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changed your payroll withholding,
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expect deductions or credits to be meaningfully different from the prior year,
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had a major life change, such as marriage, divorce, retirement, or a change in dependents,
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are concerned that your current payments may not align with your expected tax liability, or
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want help planning for cash flow before your tax return is filed.
If you already received an estimated tax recommendation earlier in the year, you should consider requesting an update if your current-year facts have changed from the assumptions used in that original calculation. This is especially important if your income, withholding, deductions, investment activity, or business results have changed significantly.
If nothing has changed and you are comfortable continuing with the payment recommendation previously provided, an updated quarterly calculation may not be necessary. However, if you are interested in limited estimate support during the year, we generally recommend prioritizing the 3rd quarter estimate because it gives us the best opportunity to evaluate your current-year tax position before year-end planning opportunities expire.
An estimated tax calculation is most useful when it is based on complete and current information. If you request a calculation or update, please provide the requested information by the deadline included in our communication so we have time to review your information and provide a recommendation before the payment due date.
Final Thoughts
Estimated tax payments are not a separate or additional tax. They are a timing mechanism for paying your expected annual tax liability throughout the year.
The goal is to stay current, reduce surprises at filing, manage cash flow, and lower the risk of IRS underpayment penalties.
If you are a current Parks Tax client and your income, withholding, or financial situation has changed significantly since your last estimate calculation, please let us know so we can determine whether an update is recommended.
If you are not currently a Parks Tax client and would like assistance with tax planning or estimated tax calculations, please submit a prospective client inquiry form through our website. We will review your information and let you know whether our services are a good fit for your needs.