Quarterly Estimated Taxes: A Must-Know for the Self-Employed
Why Do You Need to Pay Quarterly?
When you're a W-2 employee, your employer withholds federal and state taxes from each paycheck. But as a self-employed individual, there's no employer to do this. The IRS doesn't want to wait until April of the following year to collect an entire year's worth of taxes, so you're required to pay quarterly.
These are called Estimated Taxes, paid using Form 1040-ES.
Four Key Deadlines
| Quarter | Covers | Federal Due Date |
|---------|--------|-----------------|
| Q1 | Jan–Mar | April 15 |
| Q2 | Apr–May | June 15 |
| Q3 | Jun–Aug | September 15 |
| Q4 | Sep–Dec | January 15 (next year) |
California has its own estimated tax schedule with different allocation percentages — be sure to check those separately.
How Much Should You Pay?
The IRS provides two Safe Harbor methods — meet either one and you won't face penalties:
- Pay at least 90% of your current year's tax liability
- Pay at least 100% of last year's tax liability (110% for higher-income filers)
Most self-employed individuals use the second method since last year's tax amount is a known figure and easier to calculate.
What Happens If You Miss a Payment?
The IRS calculates an underpayment penalty for each quarter separately, charging interest daily. Even if you pay the full amount at year-end, penalties from earlier quarters have already accrued.
How to Pay
- IRS Direct Pay (irs.gov/payments): Free, direct bank debit
- EFTPS (Electronic Federal Tax Payment System): Requires advance registration
- Check or money order: Mail with the 1040-ES payment voucher
California estimated taxes are paid separately through the FTB (Franchise Tax Board).
Practical Tips
- Spend 10 minutes at the end of each quarter estimating your income and tax due
- Set calendar reminders for one week before each deadline
- Unsure how much to pay in your first year? The prior-year safe harbor method is your safest bet
- If your income fluctuates significantly, consider the annualized income installment method to adjust each quarter
FAQ
Why do self-employed people have to pay estimated taxes quarterly?
There's no employer withholding taxes for you, and the IRS doesn't want to wait until the following April to collect a full year of tax, so quarterly prepayment is required.
How much do I need to pay each quarter to avoid a penalty?
Meet either safe harbor: pay at least 90% of your current year's tax liability, or at least 100% of last year's liability (110% for higher-income filers).
What happens if I underpay or miss a payment?
The IRS calculates an underpayment penalty separately for each quarter with daily interest — even if you pay in full by year-end, penalties from earlier quarters have already accrued.
Do I pay California estimated taxes together with federal?
No. California estimated taxes are paid separately through the FTB, with different due dates and allocation percentages than the federal schedule.
I'm not sure how much to pay in my first year of self-employment — what should I do?
Use the prior-year safe harbor method. It's based on a known number (last year's tax) and is the simplest, safest approach.
This article is general tax education and does not constitute personalized tax advice. Please consult a qualified tax professional for your specific situation.