When you receive a paycheck from an employer, federal and state income taxes are withheld automatically and remitted to the IRS on your behalf before the money ever reaches your bank account. The system is designed so that most of your tax obligation is satisfied incrementally throughout the year, with any remaining balance settled at filing time.
When you earn income outside of that employer-withholding framework, through self-employment, a business, rental properties, investments, or other sources, no one is withholding on your behalf. The IRS still expects to receive its share throughout the year. Estimated tax payments are how you fulfill that obligation on income that doesn't come with automatic withholding.
Do You Have an Estimated Tax Obligation?
As a general rule, you're required to make estimated tax payments if you expect to owe at least $1,000 in federal tax after subtracting withholding and credits, and if your withholding will cover less than 90% of this year's tax or less than 110% of last year's tax.
Typically Required to Pay
- Self-employed individuals and freelancers
- Small business owners (sole props, partnerships, S-Corps)
- Landlords with rental income
- Investors with significant capital gains or dividends
- W-2 employees with large side income
- Retirees with pension, Social Security, or RMD income
Typically Not Required to Pay
- W-2 employees whose withholding covers their full liability
- Those who owed less than $1,000 in tax last year
- Those whose prior year tax was zero (in some cases)
- Those who increased W-2 withholding to cover all sources
What Estimated Payments Actually Pay
Estimated payments aren't just for income tax: they cover every federal tax obligation that isn't satisfied through withholding. For self-employed individuals, that includes self-employment tax (15.3% on net self-employment income up to the Social Security wage base, 2.9% above it), which is often the single largest line item for sole proprietors and independent contractors.
What Your Estimated Payments Cover
✓ Federal income tax on all taxable income
✓ Self-employment tax (Social Security+ Medicare) — applies to net SE income
✓ Net Investment Income Tax (3.8% surtax on investment income over threshold)
✓ Additional Medicare Tax (0.9% on wages/SE income over $200K single / $250K MFJ)
✓ State income tax (most states follow a similar quarterly payment system)
When Are Estimated Payments Due?
Despite the term"quarterly," the IRS schedule is not four evenly-spaced periods. The due dates and the income windows they cover are as follows:
Q1 due April 15 (Income Period Covered: January-March)
Q2 due June 15 (Income Period Covered: April-May)
Q3 due September 15 (Income Period Covered: June-August)
Q4 due January 15 of next year (Income Period Covered: September-December)
Notice that Q2 covers only two months (April and May), while Q4 spans four months. This asymmetry is a frequent source of confusion, particularly for taxpayers whose income spikes in Q2 or Q4.
Payments Must Match When Income Is Earned
This is the most important and most misunderstood aspect of estimated taxes. The IRS doesn't simply care whether you paid enough by year-end: it cares whether you paid enough in each individual quarter relative to that quarter's income.
The common misconception: "I'll catch up in April when I file." The IRS treats each quarterly due date independently. A Q1 underpayment isn't remedied by a larger Q3 payment. Penalties are calculated from the date each quarterly payment was due and accrue until either the payment is made or the return is filed.
The current underpayment penalty rate is the federal short-term rate plus 3 percentage points, adjusted quarterly. It's not a catastrophic amount on its own, but it's a completely avoidable cost, and it compounds across every quarter where payments were insufficient.
Making the Actual Payment
The IRS offers several ways to submit estimated tax payments. The most reliable is the Electronic Federal Tax PaymentSystem (EFTPS) at eftps.gov; you can schedule payments in advance, track payment history, and set up reminders. The IRS Direct Pay system at irs.gov/payments is also available for one-time payments without registration.
⚠ Don't Forget State Estimated Taxes
Federal and state estimated payments are separate obligations with separate portals. Missing a state payment can trigger state-level underpayment penalties independent of your federal situation. Most states follow the federal quarterly schedule, but confirm your state's specific dates each year.
Understanding the estimated payment system is the foundation for all other tax planning. If you're unsure whether you have an obligation, or you've been making payments but aren't confident they're sized correctly, that's exactly the conversation our planning work is designed to have before a penalty letter arrives. Schedule a call with CWG's CPA, Ian Snedden, to discuss.
Colorado Wealth Group (“CWG”) is a financial services group offering investment advisory services through Savvy Advisors,Inc. (“Savvy”). Savvy is an investment advisor registered with the Securities and Exchange Commission (“SEC”). CWG is not a separately registered investment advisor.
Material prepared herein has been created for informational purposes only and should not be considered investment advice or a recommendation. Information was obtained from sources believed to be reliable but was not verified for accuracy. It is important to note that federal tax laws under the Internal Revenue Code (IRC) of the United States are subject to change, therefore it is the responsibility of taxpayers to verify their taxation obligations.
