Quick answer: if your side hustle will leave you owing $1,000 or more in federal tax when you file, after withholding and credits, the IRS generally expects you to pay during the year through quarterly estimated taxes. For income earned in 2026 the payments are due April 15, June 15 and September 15, 2026, and January 15, 2027. You can avoid the underpayment penalty by paying at least 90% of this year’s tax or 100% of last year’s tax (110% if your adjusted gross income was over $150,000), either through Form 1040-ES payments or by raising the withholding at your regular job.
A paycheck from an employer comes with tax already taken out. Side hustle money usually does not. Freelance payments, marketplace sales, rideshare earnings and tutoring fees arrive in full, and the tax on them is your job to send in. The United States tax system is pay-as-you-go, so the IRS wants that money during the year, not in one lump in April.
That is what quarterly estimated taxes are for. They sound intimidating, yet the system is simple once you know the trigger, the safe harbors and the calendar. This guide walks through all three, plus the math for each payment. It sits inside our larger collection of side hustle ideas and starter guides, and it pairs well with our primer on side hustle taxes for beginners if you are still learning what counts as taxable income.
Sources: Internal Revenue Service, Estimated Taxes page, Form 1040-ES (2026) instructions, Publication 505 (Tax Withholding and Estimated Tax), Self-Employment Tax page, Topic No. 306 (Penalty for Underpayment of Estimated Tax), Form 2210 instructions, Publication 15 (2026) for the Social Security wage base. This article is general information, not tax advice. Checked October 2026.
What Quarterly Estimated Taxes Are
Quarterly estimated taxes are advance payments of the income tax and self-employment tax you expect to owe on money that has no withholding. The IRS describes estimated tax as the method used to pay tax on income that is not subject to withholding, including earnings from self-employment, interest, dividends, rents and prizes.
Two separate taxes ride on side hustle profit. The first is ordinary federal income tax, figured at your normal bracket. The second is self-employment tax, which covers Social Security and Medicare for people who work for themselves. Employees split those payroll taxes with an employer; a self-employed person pays both halves, so the combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.
Estimated payments are not an extra tax. They are a prepayment. When you file your annual return, the payments you made during the year are credited against the total you owe, just like withholding from a W-2 job. Pay too much and the difference comes back as a refund. Pay too little and you owe the balance, possibly with a penalty.
You can read the official overview on the IRS estimated taxes page, which covers individuals, sole proprietors, partners and S corporation shareholders.
Do You Have to Pay Estimated Taxes?
You generally must make estimated payments if you expect to owe at least $1,000 in federal tax for the year after subtracting your withholding and refundable credits. That is the core test in the Form 1040-ES instructions.
A second condition also applies. You only need to pay estimates if your withholding and credits will be less than the smaller of two amounts: 90% of the tax on this year’s return, or 100% of the tax shown on last year’s return, as long as last year covered all 12 months. Many side hustlers with a full-time job meet that second test without realizing it, because their paycheck withholding already covers most of their total bill.
Quick self-check
- No day job, steady side income. If your hustle nets a few thousand dollars or more, you will likely cross the $1,000 line and need to pay estimates.
- Full-time job plus a small hustle. Your withholding may cover the gap. Compare your expected total tax with your expected withholding.
- First profitable year. If you owed no tax last year and were a U.S. citizen or resident for the whole year, the IRS says you do not have to pay estimated tax for the current year.
- Uneven income. A hustle that earns most of its money in one season can use a special method, covered later, to match payments to when the income actually arrived.
Self-employment tax has its own trigger. According to the IRS, you owe it if your net earnings from self-employment are $400 or more. That threshold is about filing Schedule SE, though, not about whether you need quarterly payments. A person who nets $900 owes some self-employment tax but may still fall below the $1,000 estimated tax line.
2026 Estimated Tax Due Dates
For income earned in calendar year 2026, the four federal payment deadlines are:
| Payment | Income period covered | Due date |
|---|---|---|
| 1st | January 1 to March 31, 2026 | April 15, 2026 |
| 2nd | April 1 to May 31, 2026 | June 15, 2026 |
| 3rd | June 1 to August 31, 2026 | September 15, 2026 |
| 4th | September 1 to December 31, 2026 | January 15, 2027 |
Notice that the “quarters” are not equal. The second period is only two months long and the fourth is four months. That quirk catches people off guard, especially in a first year, because the June payment arrives just eight weeks after the April one.
When a due date lands on a weekend or legal holiday, the payment is on time if it is made by the next business day. There is also an exception for the fourth payment: if you file your 2026 return and pay the full balance by February 1, 2027, the IRS says you do not need to make the January 15 payment.
Most states that have an income tax run their own estimated tax system with similar dates. Check your state revenue department’s website, since the thresholds and forms differ.
Safe Harbor Rules That Prevent Penalties
The safe harbor rules are the most useful part of the estimated tax system for side hustlers. They let you avoid an underpayment penalty even if your income jumps unexpectedly.
You generally will not owe the penalty if your total withholding plus timely estimated payments equal at least one of these:
- 90% of your current-year tax. This works if you can estimate this year’s income with reasonable accuracy.
- 100% of your prior-year tax. This is the easiest target, because last year’s number is already printed on your return.
- 110% of your prior-year tax if your adjusted gross income on last year’s return was more than $150,000 ($75,000 if married filing separately).
The prior-year safe harbor is popular for a reason. Suppose last year’s return showed a total tax of $6,000 and your hustle is growing fast. Paying $6,000 across the year through withholding and estimates protects you from the penalty, even if your final 2026 bill ends up much higher. You will still owe the difference in April, so set the extra money aside, but you will not pay a penalty on it.
The IRS also notes that you will not owe a penalty if the tax shown on your return, minus withholding and credits, is less than $1,000. Further waivers can apply for casualties, disasters and certain retirees or people with disabilities who had reasonable cause; Form 2210 explains them.
How to Figure Each Payment
The IRS provides a worksheet in Form 1040-ES to calculate the required amount. The steps below follow the same logic in plain language.
Step 1: Estimate your side hustle profit
Start with expected revenue for the year and subtract expected business expenses. Profit, not gross sales, is what gets taxed. If you are not sure what counts as an expense, our guide to tracking side hustle income and expenses shows how to set up categories and a simple monthly routine.
Step 2: Figure self-employment tax
Self-employment tax applies to 92.35% of your net earnings, which mirrors the employer-equivalent adjustment employees get automatically. Multiply your profit by 0.9235, then by 15.3%. For 2026, the 12.4% Social Security portion only applies up to a combined wage and self-employment earnings base of $184,500, according to IRS Publication 15. The 2.9% Medicare portion has no cap, and an additional 0.9% Medicare tax applies above certain income levels.
Step 3: Account for the deduction for half of SE tax
You can deduct half of your self-employment tax when figuring adjusted gross income. That deduction lowers your income tax, though it does not reduce the self-employment tax itself.
Step 4: Estimate income tax on the profit
Add the side hustle profit to your other income, apply your deductions, and estimate total income tax for the year. The difference between that total and what you would owe without the hustle is the extra income tax your side work creates. Tax software or last year’s return can help you find your marginal bracket.
Step 5: Subtract withholding and divide
Combine self-employment tax and the extra income tax, then subtract any withholding already covering it. Divide the remainder across the payments still due. Using the prior-year safe harbor instead? Take 100% (or 110%) of last year’s total tax, subtract this year’s expected withholding, and divide what is left by four.
A worked illustration
Here is a hypothetical example to show the arithmetic, not a prediction of anyone’s bill. Imagine a hustle that expects $12,000 of profit for the year. Self-employment tax would be about $12,000 x 0.9235 x 0.153, or roughly $1,696. If that person’s marginal income tax rate is 12%, the extra income tax on the profit, after the half-SE-tax deduction, would be somewhere near $1,340. The combined estimate is about $3,036, or around $759 per quarter. Real numbers depend on deductions, credits, state tax and filing status, so treat this only as a template.
How to Pay the IRS
You do not need to mail paper vouchers unless you prefer to. The IRS accepts estimated payments several ways:
- IRS Online Account. Sign in to schedule payments and see the ones you have already made, which is handy when you file.
- IRS Direct Pay. Pay directly from a checking or savings account with no fee and no enrollment. Choose “Estimated Tax” as the reason and “1040-ES” as the form.
- EFTPS. The Electronic Federal Tax Payment System lets you schedule payments up to 365 days ahead; it requires enrollment.
- Debit or credit card. Approved processors accept card payments for a fee charged by the processor, not the IRS.
- Check or money order. Mail it with the Form 1040-ES payment voucher to the address listed for your state.
The IRS payments page lists every current option. Whichever method you use, save the confirmation number with your tax records.
Using W-2 Withholding Instead of Quarterly Payments
If you also work a regular job, raising your paycheck withholding can replace some or all of your estimated payments. You do this by submitting a new Form W-4 to your employer and entering an extra amount to withhold each pay period on line 4(c).
This approach has a practical advantage. IRS Publication 505 explains that withholding is generally treated as paid evenly throughout the year, no matter when it actually happened. So if you realize in October that you underpaid, a bigger withholding amount for the rest of the year can cover the earlier quarters too. A late estimated payment cannot do that; it only counts from the date you make it.
The trade-off is a smaller paycheck. Some side hustlers use a mix: higher withholding to cover a predictable base amount, plus an estimated payment in a quarter when the hustle had an unusually strong stretch.
The IRS Tax Withholding Estimator on IRS.gov can help you figure the W-4 change, and it accepts self-employment income as part of the calculation.
What Happens If You Pay Late or Not at All
Missing an estimated payment does not trigger an immediate bill, but it can create a penalty when you file. The IRS figures the underpayment penalty separately for each installment period, based on how much was short and for how long. The rate is tied to the federal short-term interest rate plus 3 percentage points and is set quarterly, so the cost grows the longer a payment is late.
Paying late is still better than skipping a payment. Because the penalty is calculated by period, making a catch-up payment as soon as you notice the gap stops further charges on that amount from building.
If your income was uneven, the annualized income installment method on Form 2210 can lower or remove the penalty. It lets you show that you earned most of your money later in the year, so the earlier installments required less. Seasonal sellers, holiday market vendors and anyone who landed a big project in the fall may benefit. The calculation is detailed, and tax software handles it well.
Smart Habits for Side Hustlers
A few routines make estimated taxes nearly painless:
- Set aside a percentage of every payment. Many self-employed people move 25% to 30% of each payment into a separate savings account as a starting point. Your right number depends on your bracket and state, so adjust after your first year.
- Keep business money in its own account. A dedicated account makes profit easy to see. Our guide on opening a separate bank account for your side hustle walks through the setup.
- Put the four dates on your calendar now. A reminder two weeks ahead gives you time to check year-to-date profit.
- Recalculate after big changes. A new client, a slow season or a job change can shift your estimate. You can raise or lower later payments at any time.
- Use the prior-year number in a growth year. It gives penalty protection while you learn your new income level.
- Save every confirmation. You will enter the total of your estimated payments on your annual return.
Business structure can matter as well. A single-member LLC is taxed like a sole proprietorship by default, so the estimated tax rules stay the same. Our comparison of sole proprietor vs LLC for side hustles explains when forming a company makes sense.
Common Mistakes to Avoid
- Forgetting self-employment tax. Many first-year side hustlers estimate only income tax and end up short by the 15.3% SE tax.
- Using gross revenue. Estimate on profit after expenses, but do not exaggerate expenses to shrink payments.
- Missing the June deadline. It comes just two months after April.
- Assuming no 1099 means no tax. Income is taxable whether or not a platform sends a form.
- Waiting until April to catch up. A late-year catch-up payment or W-4 change can reduce the penalty, but only if you act before you file.
- Ignoring state estimates. Paying the IRS does not satisfy a state income tax requirement.
Frequently Asked Questions
Frequently Asked Questions
Do I have to pay quarterly taxes on a side hustle? You generally do if you expect to owe $1,000 or more in federal tax for the year after withholding and credits, and your withholding will not cover the safe harbor amount. Many people with a W-2 job can avoid separate payments by increasing paycheck withholding.
What are the 2026 estimated tax due dates? For 2026 income the dates are April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. If a date falls on a weekend or holiday, the next business day counts as on time.
How much should I pay each quarter? A common approach is to divide your expected self-employment tax plus the extra income tax from the hustle by four. To avoid penalties, total payments plus withholding should reach 90% of this year's tax or 100% of last year's tax (110% for higher earners).
What if I miss a quarterly payment? Make it as soon as possible. The IRS penalty is figured per installment period and grows with time, so a quick catch-up payment limits it. Form 2210 explains waivers and the annualized method for uneven income.
Is there a penalty if I owe less than $1,000? Generally no. The IRS says you will not owe the underpayment penalty if your balance due after withholding and credits is less than $1,000.
Do I pay estimated taxes on a hobby? Hobby income is still taxable income, so it can count toward the $1,000 test, but it is not subject to self-employment tax because a hobby is not a business.
The Bottom Line
Quarterly estimated taxes are simply the self-employed version of paycheck withholding. Check whether you will owe $1,000 or more, pick a safe harbor target, mark the four due dates and pay through IRS Direct Pay or your online account. Setting aside a slice of every payment keeps the bill from becoming a surprise. If your situation is complicated, a CPA or enrolled agent can run the numbers with you.