Estimate a realistic annual total
Start with your current net side hustle profit, then reserve roughly 25% to 30% if your income is still climbing. Use a higher reserve if state tax or a strong Q4 is likely.
Quarterly tax guide
Know exactly when each estimated tax payment is due so your side hustle does not drift into IRS penalty territory.
Use the 2025 and 2026 deadlines below, then match your payment plan to the safe-harbor rules that keep uneven income from turning into avoidable interest charges.
Next estimated payment deadline
April 15, 2026
Q1 estimated payment for tax year 2026
Income earned Jan 1 to Mar 31, 2026
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2025 and 2026 quarterly estimated tax due dates
The IRS schedule is uneven by design: Q2 covers two months, while Q4 is paid the following January. Mark the actual due date, not the quarter label, in your calendar.
2025 payment schedule
2025 Q1 Past
April 15, 2025
Income earned Jan 1 to Mar 31, 2025
Q2 Past
June 16, 2025
Income earned Apr 1 to May 31, 2025
June 15, 2025 falls on a Sunday, so the deadline moves to Monday.
Q3 Past
September 15, 2025
Income earned Jun 1 to Aug 31, 2025
Q4 Past
January 15, 2026
Income earned Sep 1 to Dec 31, 2025
2026 payment schedule
2026 Q1 Next due
April 15, 2026
Income earned Jan 1 to Mar 31, 2026
Q2 Upcoming
June 15, 2026
Income earned Apr 1 to May 31, 2026
Q3 Upcoming
September 15, 2026
Income earned Jun 1 to Aug 31, 2026
Q4 Upcoming
January 15, 2027
Income earned Sep 1 to Dec 31, 2026
Use the safe harbor when cash flow is tight
If estimating the current year feels noisy, target last year's total federal tax instead. That keeps you inside the standard IRS safe-harbor lane even when monthly income swings.
Adjust when income is seasonal
Quarterly payments do not need to be identical forever. If spring and holiday sales dominate, increase later payments so your annual total catches up before the January deadline.
Safe harbor rules that matter most
Most side hustlers stay out of underpayment trouble by covering one of two targets before the tax return is due.
- Prior-year shortcut: Pay 100% of last year's total federal tax if your adjusted gross income was under $150,000, or 110% if it was higher.
- Current-year accuracy: Pay at least 90% of the tax you will actually owe for the current year if you are tracking income closely enough to update the math each quarter.
- Catch-up is allowed: A stronger Q3 or Q4 payment can still reduce penalties, especially if income spiked later in the year and earlier estimates were reasonable.
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Penalty examples for common side hustle patterns
The IRS underpayment penalty acts more like interest than a one-time fine. The longer an amount stays unpaid past its due date, the more the shortfall costs.
Consistent reseller income
$900 / quarter
A seller expecting about $3,600 of total annual tax can spread the full amount evenly and stay simple.
Back-loaded holiday sales
$500, $500, $1,100, $1,500
If Q4 is your biggest quarter, catch up before January instead of leaving the entire shortfall for filing season.
Skipped spring payment
Potential penalty on $900
Missing one due date can trigger interest-style charges even if you pay everything with the return, because the IRS measures when the cash arrived.
A simple payment rhythm beats last-minute catch-up
Move a set percentage of each payout into a tax savings account, then send payments with IRS Direct Pay or EFTPS before each deadline. That habit is usually more valuable than chasing perfect precision once a quarter.
Quarterly tax FAQ
Do I need to make quarterly payments if I have a W-2 job?
Possibly. If your withholding plus credits will not cover your total annual tax and you expect to owe at least $1,000, estimated payments are usually required.
What if a due date falls on a weekend or federal holiday?
The deadline moves to the next business day. This commonly affects the June and January windows depending on calendar year.
Can I make uneven quarterly payments?
Yes. Payments do not need to be equal, especially for seasonal income. You can increase later quarters to catch up with stronger months.
What is the easiest safe-harbor target?
Paying 100% of last year's total tax (or 110% at higher income levels) is the most common safe-harbor shortcut when current-year income is uncertain.
How do I send estimated tax payments?
Most filers use IRS Direct Pay or EFTPS. Both methods are online and can be used for one-time or scheduled quarterly payments.
Related guides
Need help filing after you plan
TaxSlayer Self-Employed is the stronger handoff once you know the due dates and need to turn them into a filing plan.
Use the calendar here to avoid late payments, then move into filing software built for Schedule C income, quarterly payments, and common 1099 forms.
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