Estimated Tax Payments: How to Avoid Surprises Before Tax Season

By: Andrew J. Redden, CPA

For many taxpayers, one of the most frustrating parts of tax season is finding out they owe more than expected. This is especially common when income is earned without enough tax being withheld throughout the year. Estimated tax payments are designed to help address that issue by paying tax as income is earned, rather than waiting until the return is filed.

At WealthPath CPAs & Advisors, we view estimated tax planning as more than a compliance requirement. When handled proactively, estimated payments can help reduce stress, improve cash flow planning, and prevent tax season surprises.

What Are Estimated Tax Payments?

Estimated tax payments are periodic payments made during the year to cover income tax. The IRS generally requires taxpayers to pay tax throughout the year as income is earned, either through withholding or estimated tax payments. If enough tax is not paid in each quarter, a taxpayer may owe an underpayment penalty, even if they ultimately receive a refund when the return is filed.

For W-2 employees, taxes are typically withheld from each paycheck. But when income is not subject to withholding, the taxpayer may need to make estimated payments directly to the IRS.

Who Needs to Make Estimated Tax Payments?

Estimated tax payments are most commonly needed by taxpayers who receive income that does not have automatic withholding. This includes many self-employed individuals, retirees, investors, and individuals with multiple income streams.

Common types of income that may trigger an estimated tax requirement include:

• Self-employment income

• Partnership or S corporation income

• Rental income

• Interest and dividends

• Capital gains from selling investments

• Retirement account distributions

• Side gig or consulting income

  
  

While W-2 employees may have estimated tax payment requirements, especially when they have investment income, business income, or significant changes during the year, we would generally recommend increasing withholding by amended Form W-4 on file with your employer in favor of making quarterly estimates.

When Are Estimated Tax Payments Due?

Estimated tax payments are generally made four times per year. For the 2026 tax year, IRS estimated tax payment dates are generally April 15, June 15, September 15, 2026, and January 15, 2027.

These deadlines do not line up perfectly with calendar quarters, which can cause confusion. Because of this, taxpayers should review estimated payments before each deadline rather than waiting until year-end.

State estimated tax payments may also be required, depending on where you live and where income is earned. Since Pennsylvania allows few deductions and credits, we often note state estimated tax payment requirements even when there is no federal requirement.

How Are Estimated Tax Payments Calculated?

There are two primary ways to approach estimated tax payments: the actual tax method and the safe harbor method.

What Is the Actual Tax Method?

The actual tax method estimates your current-year tax liability based on what is happening this year. This approach looks at income, deductions, credits, withholding, and expected tax due for the current year.

This method can be more accurate, especially if your income changes significantly from year to year. It is often helpful for business owners, retirees, and investors whose income is not consistent.

The challenge is that it requires updated information. Without clean records and timely projections, it can be difficult to know whether the estimate is reliable.

What Is the Safe Harbor Method?

The safe harbor method is designed to help taxpayers avoid underpayment penalties by paying a required minimum amount during the year. In general, taxpayers can avoid a penalty if they pay enough through withholding and estimated payments to cover either 90% of the current-year tax or 100% of the prior-year tax. For certain higher-income taxpayers, the prior-year safe harbor may increase to 110%.

Safe harbor calculations can be useful because they provide a clearer target. However, they do not necessarily mean the taxpayer will avoid owing at tax time. They simply help reduce or avoid underpayment penalties.

We generally recommend the actual tax method in years where income is expected to decline year-over-year, and the safe harbor method in years where income is expected to rise.

Why Are Estimated Taxes So Difficult?

Estimated taxes are challenging because they require planning before the final numbers are known. Business income can fluctuate, investment gains may occur unexpectedly, deductions may change, and life events can shift the tax picture quickly.

This is why relying only on last year’s return can be risky. Last year may not reflect:

• A new business

• A large raise or bonus

• A stock sale

• A rental property

• A retirement transition

• Changes in deductions or credits

• A spouse entering or leaving the workforce

  
  

Estimated tax planning is most effective when it is updated throughout the year using actual information.

How Does a Proactive Tax Advisor Help?

The goal of estimated tax planning is not just to make payments; it is to create clarity. A thoughtful projection helps identify whether you are on track, whether withholding needs adjusted, and whether estimated payments should increase or decrease.

For example, a business owner may need to know how much of their profit should be reserved for taxes versus how much can be reinvested in the business. A retiree may need to determine whether withholding from IRA distributions is enough to cover their annual tax liability. An investor may want to understand the tax impact of selling appreciated stock before the sale happens.

These decisions are easier when projections are completed before deadlines arrive.

Conclusion: Be Intentional With Estimated Tax Planning

Estimated tax payments are an important part of staying ahead of your tax obligations, especially when you earn income without regular withholding. While safe harbor rules can help avoid penalties, actual tax projections provide a clearer picture of where you stand and what to expect.

At WealthPath CPAs & Advisors, we help clients manage estimated taxes through proactive planning, timely projections, and clear recommendations. By reviewing your tax picture throughout the year, we help eliminate surprises and give you confidence before tax season begins.

Need help calculating your estimated tax liability? Talk with a CPA.