Missing a deadline doesn't just mean a late filing — it means penalties that compound fast. The IRS charges a failure-to-file penalty of 5% per month on any unpaid balance, up to 25% of what you owe. Missing by a few weeks is expensive. Missing repeatedly is the kind of problem that ends up needing professional resolution. This page organizes the key IRS filing deadlines, estimated tax payment dates, and payroll deposit schedules by entity type so you can stay ahead of them all year.
One Important Rule Before You Check Any Date
Deadlines that fall on a Saturday, Sunday, or federal holiday automatically shift to the next business day. This isn't a loophole — it's a built-in IRS rule, and it applies across all entity types. Always verify the exact calendar date for the current tax year rather than assuming the standard date holds. When in doubt, we can confirm current deadlines for you directly.
Quarterly Estimated Tax Payment Dates for Self-Employed Filers
If you're self-employed, a freelancer, or a sole proprietor, you're responsible for paying income taxes throughout the year — not just in April. The IRS requires estimated payments four times a year, and the schedule is not evenly spaced, which is exactly why so many self-employed taxpayers get caught off guard.
The Four Quarterly Payment Deadlines
Estimated payments follow this schedule for the standard tax year:
- Q1 (January 1 – March 31): Due April 15
- Q2 (April 1 – May 31): Due June 16
- Q3 (June 1 – August 31): Due September 15
- Q4 (September 1 – December 31): Due January 15 of the following year
The Q2 deadline in June — not July — is the one that trips people up most often. Four payments, made on time, prevent the kind of large balance due in April that leads to underpayment penalties on top of the tax itself.
What Happens If You Skip an Estimated Payment
Skipping or underpaying a quarterly estimated tax payment doesn't mean you'll owe a penalty at the end of the year automatically — but it usually does. The IRS calculates underpayment penalties based on how much you owed at each quarterly due date, not just your total annual balance. Paying everything in April doesn't undo the penalty for the quarters you missed. If your income is irregular or hard to predict, we can help you calculate safe harbor payments that keep you protected even when your earnings vary.
Who Is Required to Make Estimated Payments
You generally need to make quarterly estimated payments if you expect to owe at least $1,000 in federal income tax after withholding and credits. This applies to:
- Sole proprietors and single-member LLCs
- Partners in a partnership
- S-corporation shareholders receiving pass-through income
- Freelancers, independent contractors, and gig workers
- Landlords with significant rental income
- Retirees with investment income not covered by withholding
If you're unsure whether your situation requires estimated payments, that's a planning conversation worth having before a penalty notice makes it urgent.
Individual Filer Deadlines
For individual taxpayers, the core tax calendar centers on April 15 — but there are several other dates that matter throughout the year.
- January 15: Q4 estimated tax payment due (prior year)
- April 15: Individual income tax return due (Form 1040); Q1 estimated payment due; deadline to contribute to an IRA for the prior tax year
- April 15: Automatic extension request deadline (Form 4868) — extends the filing deadline to October 15, but does not extend the deadline to pay any tax owed
- June 16: Q2 estimated tax payment due
- September 15: Q3 estimated tax payment due
- October 15: Extended individual return deadline
An extension gives you more time to file, not more time to pay. If you expect to owe, payment is still due by April 15 to avoid interest and late payment penalties.
Business Tax Deadlines by Entity Type
Business income for sole proprietors and single-member LLCs flows directly to the owner's individual return (Schedule C on Form 1040), so the filing deadline mirrors the individual calendar:
- April 15: Return due
- April 15: Extension request deadline (extends to October 15)
- October 15: Extended return deadline
Estimated quarterly payments still apply and follow the schedule outlined above.
Partnerships and S-Corporations (Pass-Through Entities)
Partnerships (Form 1065) and S-corporations (Form 1120-S) file earlier than individual returns:
- March 15: Original return due
- March 15: Deadline to request a six-month extension (extends to September 15)
- September 15: Extended return deadline
These entities issue Schedule K-1s to their owners, which is why they file first — owners need their K-1 before they can complete their personal returns.
C-Corporations
C-corporations (Form 1120) follow a different schedule:
- April 15: Original return due (for calendar-year corporations)
- April 15: Deadline to request a six-month extension (extends to October 15)
- October 15: Extended return deadline
Fiscal-year C-corporations have a deadline of the 15th day of the fourth month after their fiscal year ends, which varies by company.
Sole Proprietors and Single-Member LLCs
Business income for sole proprietors and single-member LLCs flows directly to the owner's individual return (Schedule C on Form 1040), so the filing deadline mirrors the individual calendar:
- April 15: Return due
- April 15: Extension request deadline (extends to October 15)
- October 15: Extended return deadline
Estimated quarterly payments still apply and follow the schedule outlined above.
Multi-Member LLCs
Multi-member LLCs taxed as partnerships follow the partnership calendar — March 15 for the original return, with a six-month extension available to September 15. If your LLC has elected to be taxed as an S-corporation or C-corporation, the corresponding corporate deadline applies instead.
A Note on State Filing Deadlines
North Carolina generally mirrors federal deadlines for individual and business returns, but state-specific rules apply for sales tax, payroll withholding, and certain business filings. If you have questions about your North Carolina filing obligations specifically, we can walk through them with you.
Payroll Tax Deposit Schedules
Payroll taxes operate on their own deposit schedule, separate from annual return deadlines — and the IRS takes late payroll deposits seriously. Penalties for late deposits start at 2% and can reach 15% depending on how late the deposit is and whether the IRS had to issue a notice.
The two main deposit schedules are:
- Monthly depositors: Payroll taxes withheld in a given month are due by the 15th of the following month.
- Semi-weekly depositors: If you paid wages on Wednesday, Thursday, or Friday, the deposit is due the following Wednesday. If you paid wages on Saturday through Tuesday, the deposit is due the following Friday.
Your deposit schedule is determined by your total payroll tax liability over a lookback period. New employers are generally monthly depositors. The IRS notifies you of your assigned schedule, but it's worth confirming annually. The quarterly payroll return (Form 941) is due by the last day of the month following each quarter: April 30, July 31, October 31, and January 31.
Common Questions About Tax Deadlines
What is the difference between a filing extension and a payment extension?
A filing extension gives you more time to submit your return — it does not give you more time to pay. If you owe taxes, that balance is still due by the original deadline. Interest and late payment penalties apply to any unpaid balance after that date, even if you filed an extension.When are quarterly estimated taxes due for self-employed individuals?
The four payment deadlines are April 15, June 16, September 15, and January 15 of the following year. The Q2 deadline in June — not July — is the one most people miss. Missing any quarterly payment can trigger an underpayment penalty even if you pay the full balance in April.Do S-corps and partnerships have the same tax deadlines as individual filers?
No. S-corporations and partnerships file on March 15, one month earlier than individual returns. This is intentional — these entities issue Schedule K-1s to their owners, and those K-1s are needed to complete individual returns. Missing the March 15 deadline creates a ripple effect for every owner's personal filing.What happens if a tax deadline falls on a weekend or holiday?
The deadline automatically moves to the next business day. This applies to filing deadlines, estimated payment due dates, and payroll deposit deadlines. It's a standard IRS rule, but the specific calendar date changes each year, so it's worth checking the current year's schedule rather than assuming the standard date applies.Can I be penalized for missing estimated tax payments even if I pay everything in April?
Yes. The IRS calculates underpayment penalties quarter by quarter, based on what you owed at each due date. Paying your full balance in April doesn't eliminate the penalty for quarters you missed. The penalty is calculated on the amount that was underpaid for each period, not just the annual total.