Calendar
Meeting calendar deadlines and important dates is crucial for maintaining smooth business operations and ensuring compliance with regulatory requirements. Staying organized with timely reminders helps avoid penalties, late fees, and missed opportunities. By maintaining an up-to-date calendar that includes tax filing deadlines, financial reporting dates, renewal periods for licenses, and key industry-specific events, proactive management of these dates supports better workflow, reduces stress, and enhances overall efficiency.
The calendar dates listed consist of due dates and deadlines. These dates are subject to change. For information about deadlines falling on a holiday or weekend, please see calendar notes below.
➜ Please note that these dates do not reflect the changes in deadlines regarding disaster relief. To see more information from the IRS, you can visit this webpage for updates across the nation.
2026 Important Events
1/1 Office Closure: New Year's Day
1/15 Estimated Tax Payment: Q4 Individuals
1/31 1099 W2 Q4 Deadline
2/2 Payroll + Sales Tax Return Due: Q4 (October – December), Filing period end date – December 31
3/16 Tax Deadline: S Corps (Form 1120S), LLCs, Partnerships (Form 1065) Returns
4/15 Tax Deadline: C Corps (Form 1120), Trusts (Form 1041), Individuals (Form 1040) Returns
4/15 Estimated Tax Payment: Q1 Corporations + Individuals
4/30 Payroll + Sales Tax Return Due: Q1 (January – March), Filing period end date – March 31
5/7 Form 571-L Deadline
5/15 Tax Deadline: Non Profit Returns
5/25 Office Closure: Memorial Day
6/15 Estimated Tax Payment: Q2 Corporations + Individuals
7/3 Office Closure: Independence Day
7/31 Payroll + Sales Tax Return Due: Q2 (April – June), Filing period end date – June 30
9/7 Office Closure: Labor Day
9/15 Estimated Tax Payment: Q3 Corporations + Individuals
9/15 Tax Extension: S Corps (Form 1120S), LLCs, Partnerships (Form 1065) Returns
9/30 Tax Extension: Trust (Form 1041) Returns
10/15 Tax Extension: C Corps (Form 1120), Individuals (Form 1040) Returns
11/2 Payroll + Sales Tax Return Due: Q3 (July – September), Filing period end date – September 30
11/16 Tax Extension: Non Profit Returns
11/26-11/27 Office Closure: Thanksgiving
12/25 Office Closure: Christmas
Tax Calendars
IRS Tax Due Dates
Weekend or Holidays
If a due date falls on a Saturday, Sunday or legal holiday, the due date is delayed until the next business day.
Your return is considered filed on time if your envelope is properly addressed, postmarked and deposited in the mail by the due date.
Payroll Tax Due Dates
Weekend or Holidays
If a due date is on a Saturday, Sunday, or legal holiday, the next business day is the last day you can submit them.
Sales Tax Due Dates
Weekend or Holidays
If the due date falls on a weekend or state holiday, the due date is extended to the next business day.
You must submit your payment on or before the due date. If you initiate your payment on the due date, your transaction must be completed before 12:00 midnight (Pacific time) to be considered timely. Note: It is not necessary to submit a zero payment if no taxes/fees are due. For electronic funds transfer (EFT) accounts, if you initiate your payment on the due date, your transaction must be completed before 3:00 p.m. (Pacific time) to be considered timely.
Business Property Statement
Weekend or Holidays
If the due date falls on a weekend or a legal holiday, the statement can be submitted on the next business day.
Statements are due April 1st. A 10% penalty will be applied if a BPS is received after May 7th. It is considered delinquent if it is postmarked after 5:00 PM on May 7th (or the next business day if May 7th falls on a weekend or holiday).
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