Estimated Tax Payments: They Aren’t Just for the Self-Employed

While traditional employees generally see their income, Social Security, and Medicare taxes automatically deducted from their paychecks, the rules change significantly for those operating outside the standard W-2 environment. For the self-employed, freelancers, and business owners in California, the responsibility of prepaying taxes falls squarely on their shoulders through periodic estimated tax payments. These payments are based on an estimation of your net earnings for the year, following a specific IRS schedule. Neglecting these requirements isn't just a bookkeeping oversight; it can lead to mounting interest penalties that eat into your hard-earned profits.

Who Is Required to Make Estimated Payments?

It is a common misconception that only full-time business owners need to worry about quarterly filings. In reality, anyone who receives income where tax isn't withheld—or where withholding is insufficient—should be making estimated payments. At Christiansen Accounting, we frequently work with clients who have diverse income streams, such as gains from stock or property sales, investment dividends, or taxable alimony. Additionally, if you are a partner in a partnership or a shareholder in an S-corporation, you likely have income not subject to withholding. Other triggers for these payments include owing the 3.8% net investment income tax or managing employment taxes for household employees.

2026 Estimated Tax Deadlines

Despite often being called “quarterly” estimates, the IRS payment periods do not align perfectly with standard calendar quarters. Staying on top of these dates is essential for avoiding penalties.

2026 ESTIMATED TAX INSTALLMENTS DUE DATES
Quarter	Period Covered	Months	Due Date
First	January through March	3	April 15, 2026
Second	April and May	2	June 15, 2026
Third	June through August	3	September 15, 2026
Fourth	September through December	4	January 15, 2027

Estimated tax planning for California businesses

Understanding Underpayment Penalties

The IRS provides a small safety margin known as the “de minimis” exception: if the tax you owe after credits and withholding is less than $1,000, the penalty typically won't apply. However, once you exceed that amount, the IRS begins assessing underpayment penalties based on the specific periods shown in the table above. It is important to remember that an overpayment in one period can be carried forward, but an underpayment in an earlier period cannot be fully corrected by simply paying more later in the year.

Standard payments are usually calculated as one-fourth of your total projected annual tax. However, for those with seasonal income or sudden windfalls, our team can help you utilize actual income methods to ensure your penalties are minimized based on when you actually earned the money.

Utilizing IRS Safe Harbors

For those who prefer a more straightforward approach to avoid penalties, the IRS offers “safe harbor” rules. Generally, you can avoid a penalty if your combined withholding and estimated payments reach at least:

90% of your current year’s total tax liability, or
100% of the tax shown on your prior year’s return.

Note that for high-income earners—those with an adjusted gross income (AGI) over $150,000—the prior-year safe harbor increases to 110%. Navigating these thresholds requires precision, as even a small miscalculation can trigger a notice.

Refining Your Strategy

Some taxpayers attempt to bridge the gap by increasing withholding on their W-2 wages to cover outside income. While this is a valid strategy, it is often less precise than calculating per-period payments and requires careful monitoring. Our seven-person team at Christiansen Accounting is here to assist you with tax planning for freelancers, adjusting your withholdings, and establishing safe harbor payments that protect your cash flow. Please contact Corina Christiansen and our staff today for expert guidance on your 2026 tax strategy.

Beyond just federal requirements, California residents must also be mindful of the Franchise Tax Board's specific rules for estimated payments, which often mirror the IRS but can have different thresholds for higher earners. Tracking these nuances is where having a dedicated seven-person team becomes an asset. We can help you implement a cloud-based record-keeping system to track your quarterly net earnings in real-time. This proactive approach eliminates the stress of scrambling as each deadline approaches, allowing you to focus on growing your business or managing your investments with confidence.

Strategic tax planning for California residents

Additionally, if you are a high-income earner in the Golden State, we ensure that your safe harbor is calculated correctly to account for state-specific taxes and other local variables that many generic software packages frequently overlook. Proper tax hygiene means more than just avoiding a penalty; it ensures your financial lifecycle remains predictable and secure. Let Christiansen Accounting help you navigate these complexities so you can stay focused on your long-term financial success.

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