If you are self-employed, a freelancer, or a small business owner in Texas, you are responsible for paying your own taxes throughout the year through quarterly estimated tax payments. Missing these payments — or underpaying them — results in penalties and a large, unexpected tax bill in April. This guide explains how quarterly estimated taxes work, when they are due, and how to calculate them correctly.
Who Needs to Pay Quarterly Estimated Taxes?
You generally need to make quarterly estimated tax payments if you expect to owe $1,000 or more in federal tax after subtracting withholding and credits. This applies to sole proprietors, independent contractors, freelancers, S-Corp and partnership owners, rental property owners, and anyone with significant income not subject to withholding. Since Texas has no state income tax, your quarterly payments only go to the IRS (federal estimated taxes).
When Are Quarterly Payments Due?
Despite being called “quarterly,” the payment schedule does not follow calendar quarters evenly. For 2025, the due dates are April 15 (for income earned January through March), June 16 (April and May income), September 15 (June through August income), and January 15, 2026 (September through December income). Mark these dates on your calendar — late payments trigger penalties even if you eventually pay the full amount owed.
How to Calculate Your Estimated Tax Payments
There are two safe harbor methods to avoid underpayment penalties. The first is to pay at least 100% of your prior year tax liability divided into four equal payments (110% if your AGI exceeded $150,000). The second is to pay at least 90% of your current year tax liability as you earn it. Most CPAs recommend using the prior year safe harbor method because it provides a fixed, predictable payment amount regardless of income fluctuations during the current year.
Self-Employment Tax: The Hidden Cost
Self-employed individuals pay both the employer and employee portions of Social Security and Medicare taxes, totaling 15.3% on the first $168,600 of net self-employment income (2024) and 2.9% Medicare tax on amounts above that. An additional 0.9% Medicare surtax applies to self-employment income above $200,000 for single filers ($250,000 for joint filers). Your quarterly payments need to cover both income tax and self-employment tax.
Common Mistakes That Trigger Penalties
The most frequent mistakes we see include waiting until year-end to address estimated taxes, basing payments on last year’s income when current year income has increased significantly, forgetting to include self-employment tax in the calculation, and not adjusting payments when business income spikes mid-year. Even a single missed quarterly payment can result in a penalty, and the IRS calculates penalties on a quarter-by-quarter basis.
Strategies to Manage Cash Flow
Set aside 25-30% of every payment you receive into a separate savings account designated for taxes. This prevents the cash flow crunch that many self-employed individuals experience at payment time. If your income is irregular, consider making larger payments in quarters when income is higher and smaller payments when it dips, as long as your total payments meet the safe harbor threshold by year-end.
How Whetzel CPA Helps
We calculate quarterly estimated tax payments for our self-employed clients, provide payment vouchers with exact amounts and due dates, and adjust projections throughout the year as income changes. This eliminates guesswork and ensures you never face an unexpected tax bill or penalty. If you have fallen behind on estimated payments, we can help you catch up and minimize any penalties owed.
Contact Whetzel CPA at (832) 983-7080 or schedule a free consultation to get your quarterly tax payments on track.
Related services
Quarterly estimates are part of ongoing tax management.