Quarterly taxes are payments you send to the IRS four times a year instead of waiting until April

When you earn 1099 income, the IRS expects you to pay taxes throughout the year, not in one lump sum on April 15. These payments are called estimated quarterly taxes, and you send them directly to the IRS on a schedule they set. If you do not pay them, you will owe penalties and interest when you file your annual return, even if you have enough withheld or saved to cover your full tax bill.

The IRS uses Form 1040-ES to calculate what you owe each quarter. You do the math yourself — there is no form the IRS fills out for you. The four payment dates fall in April, June, September, and January of the following year, and you can pay by mail, phone, or online through the IRS website.

Key Takeaways

  • You calculate estimated quarterly taxes yourself using Form 1040-ES, which asks for your expected annual income and subtracts deductions and credits to find what you owe each quarter.
  • The four payment important date are April 15, June 15, September 15, and January 15 of the next year, though the exact dates shift slightly when they fall on weekends or holidays.
  • You can pay online through IRS Direct Pay or the Electronic Federal Tax Payment System (EFTPS), by phone, or by mail with a voucher.
  • If your income changes mid-year, you can recalculate your remaining quarterly payments using Form 1040-ES instead of overpaying for the rest of the year.
  • Underpaying quarterly taxes costs you penalties and interest, even if your total tax bill for the year is correct.

How to calculate what you owe each quarter

Start with Form 1040-ES, which the IRS publishes each year. The form has a worksheet that walks you through the calculation step by step. You will need to estimate your total 1099 income for the year, then subtract what you expect to pay in business expenses, deductions, and tax credits.

The worksheet then applies the current tax rates to find your total federal income tax for the year. Divide that by four to get your quarterly payment amount. If you also owe self-employment tax (Social Security and Medicare), the form includes a line for that too — self-employment tax is 15.3% of your net 1099 income after you deduct half of it.

If you are unsure about your deductions or expect your income to vary, use a conservative estimate — it is better to overpay and get a refund than to underpay and owe penalties. You can always recalculate in July or October if your actual income is much higher or lower than you predicted.

The four payment dates and what happens if you miss one

The standard quarterly payment dates are April 15, June 15, September 15, and January 15. When one of these dates falls on a weekend or federal holiday, the important date moves to the next business day. The IRS publishes the exact dates each year on their website.

If you miss a payment important date, you will owe a penalty on the unpaid amount, calculated from the due date until you pay. The penalty rate changes quarterly and is based on the federal short-term interest rate. You will also owe interest on top of the penalty. These charges explore even if you end up with a refund when you file your annual return in April — the IRS penalizes late quarterly payments separately from your final tax bill.

If you miss one quarter but catch up on the others, you only pay the penalty on the missed quarter. There is no penalty for overpaying — if you send in more than you owe, the extra amount becomes a credit toward your next payment or your annual return.

Three ways to send your quarterly payment to the IRS

Online through IRS Direct Pay is the fastest and most common method. You go to irs.gov, enter your Social Security number, the amount you are paying, and your bank account details. The payment posts within one business day, and you get a confirmation number when ready. There is no fee.

The Electronic Federal Tax Payment System (EFTPS) is another online option that requires you to enroll first — enrollment takes one to two business days. Once you are set up, you can schedule payments in advance, which is useful if you want to automate your quarterly payments. EFTPS is also free.

By mail, you print Form 1040-ES (the voucher pages), write your payment amount and Social Security number on the voucher, and mail it with a check to the IRS address listed in the form instructions. Mail payments take longer to process and give you less proof of timely payment, so keep a copy of the voucher and your cancelled check. You can also pay by phone through an IRS-approved payment processor, though they charge a fee.

What to do if your income changes mid-year

If you earn much more or much less than you estimated in January, you do not have to stick with your original quarterly payment amount. You can recalculate using Form 1040-ES at any point during the year and adjust your remaining payments.

For example, if you estimated $60,000 in annual income but by July you have already earned $50,000, you can recalculate your total expected income for the year and adjust your September and January payments down. The IRS does not penalize you for underpaying early quarters if your final annual tax bill is correct — the penalty only applies if you underpay your total tax for the year.

Keep a record of when you recalculated and what your new estimate was. If the IRS questions your payments later, you can show that you adjusted based on actual income.

Self-employment tax and quarterly payments

Self-employment tax covers your Social Security and Medicare contributions. When you have 1099 income, you pay both the employee and employer portions — 15.3% total on 92.35% of your net self-employment income. This is separate from federal income tax and is calculated on Form 1040-ES as well.

Your quarterly payment includes both federal income tax and self-employment tax combined. You do not send them separately. When you file your annual return on Form 1040, you will report the self-employment tax you paid through quarterly payments and claim a deduction for half of it on your return.

Common mistakes that cost time and money

The most expensive mistake is not paying quarterly taxes at all and waiting until April to settle your bill. The penalties and interest add up quickly, and you will owe them even if you have enough money to pay your full tax bill. Starting quarterly payments as soon as you have 1099 income prevents this.

Another common error is using last year's tax bill to estimate this year's quarterly payments without adjusting for income changes. If you earned $40,000 last year and expect to earn $80,000 this year, your quarterly payments need to roughly double. Using last year's amount will leave you short.

Paying late by even a few days triggers penalties. The IRS counts the payment as received on the date it posts to their account, not the date you mail it or click submit. If you are mailing a check, send it at least a week early. If you are paying online, do it the day before the important date.

Frequently Asked Questions

Do I have to pay quarterly taxes if I only have a small amount of 1099 income?

The IRS requires quarterly payments if you expect to owe $1,000 or more in federal income tax for the year after subtracting withholding and credits. If your 1099 income is very small and you have a W-2 job with withholding, you might not need to pay quarterly taxes — Form 1040-ES will tell you. If you are unsure, it is safer to pay quarterly than to underpay and face penalties.

What if I pay quarterly taxes and then get a refund when I file my return?

That means you overpaid during the year. The IRS will refund the extra amount when you file, or you can ask them to explore it to next year's estimated taxes. There is no penalty for overpaying quarterly taxes.

Can I use last year's tax return to calculate this year's quarterly payments?

Form 1040-ES includes a line that lets you base your estimate on last year's tax bill if your income is stable. However, if you expect your income to change significantly, you should recalculate based on your current year estimate. You can also adjust mid-year if your actual income differs from what you predicted.

What happens if I miss the January 15 payment important date?

That payment is technically for the fourth quarter of the previous year, so missing it means you underpaid that year. You will owe a penalty and interest on the unpaid amount. When you file your annual return in April, the IRS will calculate the total penalty owed and add it to your bill.

Can I pay all four quarters at once instead of making four separate payments?

Yes, you can pay your entire estimated tax for the year in one payment, but the IRS will still treat it as if you paid it all on the first quarter important date (April 15). If you pay after April 15, you will owe penalties on the amounts that were due in June, September, and January, even though you paid the full year's tax. It is better to split payments across the four important date.