Do I Need Quarterly Tax Payments?
If you are a W-2 employee, your employer withholds taxes from each paycheck, and you settle up at tax time. But if you are self-employed, own a business, or have significant investment income, no one is withholding taxes for you. That is where quarterly estimated tax payments come in, and ignoring them can lead to costly penalties.
Who Needs to Make Quarterly Payments?
You need to make quarterly estimated tax payments if you expect to owe at least $1,000 in federal tax for the year after subtracting your withholding and credits, and if your withholding and credits will be less than the smaller of 90% of your current year tax or 100% of your prior year tax (110% if your adjusted gross income exceeds $150,000).
This applies to sole proprietors, independent contractors, S corporation shareholders, partnership partners, LLC owners, and anyone with income that is not subject to withholding, including investment income, rental income, and retirement distributions. If you receive a 1099 instead of a W-2, you almost certainly need to make quarterly payments.
How to Calculate Quarterly Payments
There are two primary methods for calculating quarterly payments. The safe harbor method is the simplest: pay 100% of your prior year's total tax liability (110% if your AGI exceeds $150,000) in four equal installments. This guarantees you will not owe an underpayment penalty, regardless of what you earn during the current year.
The current year projection method estimates your current year income and tax liability, and you pay 90% of the projected tax. This can result in lower payments if your income is declining, but it requires accurate projections and adjustments throughout the year as your income changes. We calculate both and recommend the approach that best fits your situation.
Quarterly Payment Deadlines
The IRS divides the year into four payment periods, each with its own deadline: April 15 (for January through March), June 15 (for April and May), September 15 (for June through August), and January 15 of the following year (for September through December). If any deadline falls on a weekend or holiday, it shifts to the next business day.
Illinois also requires quarterly estimated payments if you expect to owe state tax. The Illinois deadlines align with the federal schedule. We handle both federal and state estimated payment calculations for our tax planning clients.
The Cost of Skipping Quarterly Payments
If you do not make sufficient quarterly payments, the IRS assesses an underpayment penalty when you file your return. The penalty is essentially interest on the underpaid amount, calculated at the federal short-term rate plus 3 percentage points. For 2026, the rate is approximately 8% annually. On a $10,000 underpayment, that is $800 in penalties alone, money that could have been avoided with proper planning.
Many new business owners learn about quarterly payments the hard way, when they receive a tax bill that includes a penalty they did not expect. The solution is simple: tax consulting that calculates your payments and keeps you compliant throughout the year. We serve business owners across Wheaton, Naperville, and Downers Grove.
How DWK Manages Quarterly Payments
We calculate your quarterly estimated payments based on your projected income, adjusting throughout the year as your earnings fluctuate. You receive payment vouchers with the amounts and due dates, plus instructions for making payments online or by mail. If your income changes significantly, a new client, a big sale, a seasonal surge, we recalculate and adjust. This ensures you pay enough to avoid penalties without overpaying and tying up cash you need for your business. It is one of the most valuable aspects of working with a CPA year-round rather than just at tax time.