Why Small Business Owners Pay Taxes Differently
Employees have taxes withheld from every paycheck automatically. Self-employed people and small business owners don't have that safety net — which means the IRS expects you to pay taxes as you earn, not just at year-end. That's where estimated quarterly taxes come in.
Who Needs to Pay Quarterly Estimated Taxes?
Generally, you need to make estimated tax payments if you expect to owe at least $1,000 in federal taxes for the year after subtracting withholding and credits. This applies to:
- Sole proprietors and single-member LLC owners
- Freelancers and independent contractors
- Partners in a partnership
- S corporation shareholders who receive distributions
The Four Quarterly Due Dates
The IRS sets four payment deadlines each year. Mark these on your calendar:
| Payment Period | Due Date |
|---|---|
| January 1 – March 31 | April 15 |
| April 1 – May 31 | June 16 |
| June 1 – August 31 | September 15 |
| September 1 – December 31 | January 15 (following year) |
Note: If a due date falls on a weekend or federal holiday, it shifts to the next business day. Always verify current dates at IRS.gov.
How Much Should You Pay?
There are two safe-harbor methods to avoid underpayment penalties:
- Pay 100% of last year's tax liability (110% if your prior-year AGI exceeded $150,000). This is the simpler method — just divide last year's total tax by four.
- Pay 90% of your current year's estimated tax liability. This requires estimating your income more carefully but can save money in a lower-earning year.
Most small business owners find the first method easier and safer when income varies.
A Simple System for Setting Money Aside
The most common mistake: spending money you'll owe in taxes. Avoid it with this simple approach:
- Open a separate savings account labeled "Taxes"
- Every time revenue comes in, transfer 25–30% to that account immediately
- Pay quarterly from that account
- Whatever remains after your final tax filing is a bonus — or a buffer for next year
Don't Forget Self-Employment Tax
On top of income tax, self-employed individuals pay self-employment (SE) tax — currently 15.3% on net earnings up to the Social Security wage base, and 2.9% above that. This covers your Social Security and Medicare contributions. The good news: you can deduct half of SE tax from your income when calculating your income tax.
Tools That Can Help
- IRS Form 1040-ES — includes a worksheet to calculate your estimated payments
- IRS Direct Pay (IRS.gov) — free, fast way to make payments electronically
- Accounting software like Wave (free) or QuickBooks Self-Employed — can track income and estimate taxes automatically
The Bottom Line
Quarterly taxes feel complicated at first, but once you set up a system, they become routine. The key is to never commingle tax money with operating funds and to pay on time — even a partial payment is better than none. When in doubt, work with an accountant for your first year; the cost is often worth the peace of mind.