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taxmap/pubs/p509-000.htm#en_us_publink100034214
Publication 509

Tax Calendars

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Future Developments(p1)

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For the latest information about developments related to Pub. 509, such as legislation enacted after it was published, go to IRS.gov/pub509.

What’s New(p1)

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taxmap/pubs/p509-000.htm#en_us_publink100046604
Changes to due dates for filing certain returns.(p1)
The due dates of several forms, including Forms 1120, 1065, 1065-B, Form 1099-MISC (reporting nonemployee compensation), and Form W-2 have changed for returns due in 2017. The General Tax Calendar and Employer's Tax Calendar have been updated with the new due dates.
taxmap/pubs/p509-000.htm#en_us_publink100050681
Extended due date for providing individuals 2016 Forms 1095-B and 1095-C.(p1)
Notice 2016-70 extends the due date for providing individuals the 2016 Form 1095-B, Health Coverage, and the 2016 Form 1095-C, Employer-Provided Health Insurance Offer and Coverage, from January 31, 2017, to March 2, 2017. See Notice 2016-70, 2016-49 I.R.B. 784, available at IRS.gov/irb/2016-49_IRB/ar07.html.

Reminders(p1)

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taxmap/pubs/p509-000.htm#en_us_publink100046362
Online IRS Tax Calendar.(p1)
The IRS Tax Calendar for Small Businesses and Self-Employed is available online at IRS.gov/taxcalendar. This calendar is also available in Spanish.
taxmap/pubs/p509-000.htm#en_us_publink1000725
Photographs of missing children.(p1)
The IRS is a proud partner with the National Center for Missing & Exploited Children® (NCMEC). Photographs of missing children selected by the Center may appear in this publication on pages that would otherwise be blank. You can help bring these children home by looking at the photographs and calling 1-800-THE-LOST (1-800-843-5678) if you recognize a child.

taxmap/pubs/p509-000.htm#en_us_publink1000270318Introduction

A tax calendar is a 12-month calendar divided into quarters. The calendar gives specific due dates for:
taxmap/pubs/p509-000.htm#en_us_publink100034217

What does this publication contain?(p2)

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This publication contains the following.
  1. A section on how to use the tax calendars.
  2. Three tax calendars:
    1. General Tax Calendar,
    2. Employer's Tax Calendar, and
    3. Excise Tax Calendar.
  3. A table showing the semiweekly deposit due dates for payroll taxes for 2017.
Most of the due dates discussed in this publication are also included in the IRS Tax Calendar available at IRS.gov/taxcalendar. The online IRS Tax calendar is also available in Spanish.
taxmap/pubs/p509-000.htm#en_us_publink100034218

Who should use this publication?(p2)

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Primarily, employers need to use this publication. However, the General Tax Calendar has important due dates for all businesses and individuals. Anyone who must pay excise taxes may need the Excise Tax Calendar.
taxmap/pubs/p509-000.htm#en_us_publink100034219

What are the advantages of using a tax calendar?(p2)

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The following are advantages of using a calendar.
taxmap/pubs/p509-000.htm#en_us_publink100034220

Which calendar(s) should I use?(p2)

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To decide which calendar(s) to use, first look at the General Tax Calendar and highlight the dates that apply to you. If you’re an employer, also use the Employer's Tax Calendar. If you must pay excise taxes, use the Excise Tax Calendar. Depending on your situation, you may need to use more than one calendar.
taxmap/pubs/p509-000.htm#f15013x01

Table 1. Useful Publications

IF you’re...THEN you may need...
An employer• Pub. 15, Employer's Tax Guide.
• Pub. 15-A, Employer's Supplemental Tax Guide.
• Pub. 15-B, Employer's Tax Guide to Fringe Benefits.
• Pub. 926, Household Employer's Tax Guide.
A farmer• Pub. 51, Agricultural Employer's Tax Guide.
• Pub. 225, Farmer's Tax Guide.
An individual • Pub. 505, Tax Withholding and Estimated Tax.
Required to pay excise taxes• Pub. 510, Excise Taxes.
taxmap/pubs/p509-000.htm#en_us_publink100046363

What other publications and tax forms will I need?(p2)

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Table 1 lists other publications you may need. Each calendar lists the forms you may need.
See How To Get Tax Help near the end of this publication for information about getting publications and forms. There is also a list of commonly used tax forms and publications.
taxmap/pubs/p509-000.htm#en_us_publink100034221

What isn't included in these calendars?(p2)

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The calendars don't cover the employment or excise tax deposit rules. You can find the deposit rules for employment taxes in Pub. 15. The deposit rules for excise taxes are in Pub. 510 and in the Instructions for Form 720. In addition, the calendars don't cover filing forms and other requirements for:
taxmap/pubs/p509-000.htm#en_us_publink100048970

Comments and suggestions.(p2)

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We welcome your comments about this publication and your suggestions for future editions.
You can send us comments from IRS.gov/formcomment.
Or you can write to:

Internal Revenue Service
Tax Forms and Publications
1111 Constitution Ave. NW, IR-6526
Washington, DC 20224


We respond to many letters by telephone. Therefore, it would be helpful if you would include your daytime phone number, including the area code, in your correspondence.
Although we can’t respond individually to each comment received, we do appreciate your feedback and will consider your comments as we revise our tax forms, instructions, and publications.
taxmap/pubs/p509-000.htm#en_us_publink100048971
Ordering forms and publications.(p2)
Visit IRS.gov/forms to download forms and publications. Otherwise, you can go to IRS.gov/orderforms to order current and prior-year forms and instructions. Your order should arrive within 10 business days.
taxmap/pubs/p509-000.htm#en_us_publink100048972
Tax questions.(p2)
If you have a tax question not answered by this publication, check IRS.gov and How To Get Tax Help at the end of this publication.
taxmap/pubs/p509-000.htm#en_us_publink100034226

Background Information for Using the Tax Calendars(p2)

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The following brief explanations may be helpful to you in using the tax calendars.
taxmap/pubs/p509-000.htm#en_us_publink100034227

IRS e-services make taxes easier.(p2)

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Now, more than ever before, businesses can enjoy the benefits of filing and paying their federal taxes electronically. Whether you rely on a tax professional or handle your own taxes, the IRS offers you convenient programs to make taxes easier.
Use these electronic options to make filing and paying taxes easier. For more information on electronic payments, visit the IRS website at IRS.gov/payments.
taxmap/pubs/p509-000.htm#en_us_publink100034228

Tax deposits.(p2)

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Some taxes can be paid with the return on which they are reported. However, in many cases, you have to deposit the tax before the due date for filing the return. Tax deposits are figured for periods of time that are shorter than the time period covered by the return. See Pub. 15 for the employment tax deposit rules. For the excise tax deposit rules, see Pub. 510 or the Instructions for Form 720.
taxmap/pubs/p509-000.htm#en_us_publink100034229
Electronic deposit requirement.(p2)
You must use electronic funds transfer (EFT) to make all federal tax deposits. Generally, an EFT is made using the Electronic Federal Tax Payment System (EFTPS). If you don't want to use EFTPS, you can arrange for your tax professional, financial institution, payroll service, or other trusted third party to make electronic deposits on your behalf. EFTPS is a free service provided by the Department of Treasury. Services provided by your tax professional, financial institution, payroll service, or other third party may have a fee.
To get more information or to enroll in EFTPS, call 1-800-555-4477 (business), 1-800-316-6541 (individual), or 1-800-733-4829 (TTY/TDD). You can also visit the EFTPS website at eftps.gov. Additional information about EFTPS is also available in Pub. 966.
EIC
If you fail to timely, properly, and in full make your federal tax deposit, you may be subject to a failure-to-deposit penalty. For an EFTPS deposit to be on time, you must submit the deposit by 8 p.m. Eastern time the day before the date the deposit is due.
taxmap/pubs/p509-000.htm#en_us_publink100034231

Saturday, Sunday, or legal holiday.(p2)

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Generally, if a due date for performing any act for tax purposes falls on a Saturday, Sunday, or legal holiday, the act is considered to be performed timely if it is performed no later than the next day that isn't a Saturday, Sunday, or legal holiday. The term legal holiday means any legal holiday in the District of Columbia. The calendars provided in this publication make the adjustment for Saturdays, Sundays, and legal holidays. But you must make any adjustments for statewide legal holidays, as discussed later.
EIC
An exception to this rule for certain excise taxes is noted later under the Excise Tax Calendar.
taxmap/pubs/p509-000.htm#en_us_publink1000278957
Legal holidays.(p3)
Legal holidays for 2017 are listed below.
taxmap/pubs/p509-000.htm#en_us_publink100034233
Statewide legal holidays.(p3)
A statewide legal holiday delays a due date for filing a return only if the IRS office where you’re required to file is located in that state. A statewide legal holiday doesn't delay a due date for making a federal tax deposit.
taxmap/pubs/p509-000.htm#en_us_publink100034236

Penalties.(p3)

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Whenever possible, you should take action before the listed due date. If you’re late, you may have to pay a penalty as well as interest on any overdue taxes.
Be sure to follow all the tax laws that apply to you. In addition to civil penalties, criminal penalties may be imposed for intentionally not paying taxes, for intentionally filing a false return, or for not filing a required return.
taxmap/pubs/p509-000.htm#en_us_publink100034237

Use of private delivery services.(p3)

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You can use certain private delivery services designated by the IRS to meet the timely mailing as timely filing/paying rule for tax returns and payments.
For the list of private delivery services and the IRS mailing address to use if you’re using a private delivery service, go to IRS.gov and enter "private delivery service" in the search box.
The private delivery service can tell you how to get written proof of the mailing date.
EIC
The U.S. Postal Service advises that private delivery services can't deliver items to P.O. boxes. You must use the U.S. Postal Service to mail any item to an IRS P.O. box address.
taxmap/pubs/p509-000.htm#en_us_publink100034239

General Tax Calendar(p3)

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This tax calendar has the due dates for 2017 that most taxpayers will need. Employers and persons who pay excise taxes also should use the Employer's Tax Calendar and the Excise Tax Calendar.
taxmap/pubs/p509-000.htm#en_us_publink100034240

Fiscal-year taxpayers.(p3)

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If you file your income tax return for a fiscal year rather than the calendar year, you must change some of the dates in this calendar. These changes are described under Fiscal-Year Taxpayers at the end of this calendar.
taxmap/pubs/p509-000.htm#en_us_publink100034241

First Quarter(p3)

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The first quarter of a calendar year is made up of January, February, and March.
January 10
Employees who work for tips.(p3)
If you received $20 or more in tips during December, report them to your employer. You can use Form 4070.
January 17
Individuals.(p3)
Make a payment of your estimated tax for 2016 if you didn't pay your income tax for the year through withholding (or didn't pay in enough tax that way). Use Form 1040-ES. This is the final installment date for 2016 estimated tax payments. However, you don't have to make this payment if you file your 2016 return (Form 1040) and pay any tax due by January 31, 2017.
Farmers and fishermen.(p3)
Pay your estimated tax for 2016 using Form 1040-ES. You have until April 18 to file your 2016 income tax return (Form 1040). If you don't pay your estimated tax by January 17, you must file your 2016 return and pay any tax due by March 1, 2017, to avoid an estimated tax penalty.
January 31
Individuals who must make estimated tax payments.(p3)
If you didn't pay your last installment of estimated tax by January 17, you may choose (but aren't required) to file your income tax return (Form 1040) for 2016 by January 31. Filing your return and paying any tax due by January 31 prevents any penalty for late payment of the last installment. If you can't file and pay your tax by January 31, file and pay your tax by April 18.
All businesses.(p3)
Give annual information statements to recipients of certain payments you made during 2016. You can use the appropriate version of Form 1099 or other information return. Form 1099 can be issued electronically with the consent of the recipient. Payments that may be covered include the following.
  • Cash payments for fish (or other aquatic life) purchased from anyone engaged in the trade or business of catching fish.
  • Compensation for workers who aren't considered employees (including fishing boat proceeds to crew members).
  • Dividends and other corporate distributions.
  • Interest.
  • Rent.
  • Royalties.
  • Payments of Indian gaming profits to tribal members.
  • Profit-sharing distributions.
  • Retirement plan distributions.
  • Original issue discount.
  • Prizes and awards.
  • Medical and health care payments.
  • Debt cancellation (treated as payment to debtor).
  • Cash payments over $10,000. See the instructions for Form 8300.
See the General Instructions for Certain Information Returns for information on what payments are covered, how much the payment must be before a statement is required, which form to use, when to file, and extensions of time to provide statements to the IRS. Forms 1099-B, 1099-S, and certain reporting on Form 1099-MISC, Miscellaneous Income, are due to recipients by February 15.
Payers of nonemployee compensation.(p3)
File Form 1099-MISC for nonemployee compensation paid in 2016.
February 10
Employees who work for tips.(p3)
If you received $20 or more in tips during January, report them to your employer. You can use Form 4070.
February 15
Individuals.(p3)
If you claimed exemption from income tax withholding last year on the Form W-4, Employee's Withholding Allowance Certificate, you gave your employer, you must file a new Form W-4 by this date to continue your exemption for another year.
All businesses.(p3)
Give annual information statements to recipients of certain payments you made during 2016. You can use the appropriate version of Form 1099 or other information return. Form 1099 can be issued electronically with the consent of the recipient. This due date applies only to the following types of payments.
  • All payments reported on Form 1099-B, Proceeds From Broker and Barter Exchange Transactions.
  • All payments reported on Form 1099-S, Proceeds From Real Estate Transactions.
  • Substitute payments reported in box 8 or gross proceeds paid to an attorney reported in box 14 of Form 1099-MISC.
February 28
All businesses.(p3)
File information returns (for example, certain Forms 1099) for certain payments you made during 2016. These payments are described under January 31. However, Form 1099-MISC reporting nonemployee compensation must be filed by January 31. There are different forms for different types of payments. Use a separate Form 1096 to summarize and transmit the forms for each type of payment. See the General Instructions for Certain Information Returns for information on what payments are covered, how much the payment must be before a return is required, which form to use, and extensions of time to file.
If you file Forms 1097, 1098, 1099 (except a Form 1099-MISC reporting nonemployee compensation), 3921, 3922, or W-2G electronically, your due date for filing them with the IRS will be extended to March 31. The due date for giving the recipient these forms generally remains January 31.
March 1
Farmers and fishermen.(p4)
File your 2016 income tax return (Form 1040) and pay any tax due. However, you have until April 18 to file if you paid your 2016 estimated tax by January 17, 2017.
March 10
Employees who work for tips.(p4)
If you received $20 or more in tips during February, report them to your employer. You can use Form 4070.
March 15
Partnerships.(p4)
File a 2016 calendar year return (Form 1065). Provide each partner with a copy of their Schedule K-1 (Form 1065), Partner's Share of Income, Deductions, Credits, etc., or substitute Schedule K-1 (Form 1065).
To request an automatic 6-month extension of time to file the return, file Form 7004. Then file the return and provide each partner with a copy of their final or amended (if required) Schedule K-1 (Form 1065) by September 15.
Electing large partnerships.(p4)
File a 2016 calendar year return (Form 1065-B). Provide each partner with a copy of their Schedule K-1 (Form 1065-B), Partner's Share of Income (Loss) From an Electing Large Partnership, or substitute Schedule K-1 (Form 1065-B). This due date for providing Schedule K-1 (Form 1065-B) applies even if the partnership requests an extension of time to file Form 1065-B.
To request an automatic 6-month extension of time to file the return, file Form 7004. Then file the return and provide each partner with a copy of their amended (if required) Schedule K-1 (Form 1065-B) by September 15.
S corporations.(p4)
File a 2016 calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of their Schedule K-1 (Form 1120S), Shareholder's Share of Income, Deductions, Credits, etc., or substitute Schedule K-1 (Form 1120S).
To request an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe in tax. Then file the return; pay any tax, interest, and penalties due; and provide each shareholder with a copy of their Schedule K-1 (Form 1120S) by September 15.
S corporation election.(p4)
File Form 2553 to elect to be treated as an S corporation beginning with calendar year 2017. If Form 2553 is filed late, S corporation treatment will begin with calendar year 2018.
March 31
Electronic filing of Forms 1097, 1098, 1099, 3921, 3922, and W-2G.(p4)
File Forms 1097, 1098, 1099 (except a Form 1099-MISC reporting nonemployee compensation), 3921, 3922, and W-2G with the IRS. This due date applies only if you file electronically. Otherwise, see February 28.
The due date for giving the recipient these forms generally remains January 31.
For information about filing Forms 1097, 1098, 1099, 3921, 3922, and W-2G electronically, see Pub. 1220.
taxmap/pubs/p509-000.htm#en_us_publink100034257

Second Quarter(p4)

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The second quarter of a calendar year is made up of April, May, and June.
April 10
Employees who work for tips.(p4)
If you received $20 or more in tips during March, report them to your employer. You can use Form 4070.
April 18
Individuals.(p4)
File a 2016 income tax return (Form 1040, 1040A, or 1040EZ) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 4868. For more information, see Form 4868. Then, file Form 1040, 1040A, or 1040EZ by October 16.
Individuals.(p4)
If you’re not paying your 2017 income tax through withholding (or won't pay in enough tax during the year that way), pay the first installment of your 2017 estimated tax. Use Form 1040-ES. For more information, see Pub. 505.
Household employers.(p4)
If you paid cash wages of $2,000 or more in 2016 to a household employee, you must file Schedule H (Form 1040), Household Employment Taxes. If you’re required to file a federal income tax return (Form 1040), file Schedule H (Form 1040) with the return and report any household employment taxes. Report any federal unemployment (FUTA) tax on Schedule H (Form 1040) if you paid total cash wages of $1,000 or more in any calendar quarter of 2015 or 2016 to household employees. Also, report any income tax you withheld for your household employees. For more information, see Pub. 926.
Corporations.(p4)
File a 2016 calendar year income tax return (Form 1120) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe in taxes.
Corporations.(p4)
Deposit the first installment of estimated income tax for 2017. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
May 10
Employees who work for tips.(p4)
If you received $20 or more in tips during April, report them to your employer. You can use Form 4070.
June 12
Employees who work for tips.(p4)
If you received $20 or more in tips during May, report them to your employer. You can use Form 4070.
June 15
Individuals.(p4)
If you’re a U.S. citizen or resident alien living and working (or on military duty) outside the United States and Puerto Rico, file Form 1040 and pay any tax, interest, and penalties due. Otherwise, see April 18. If you want additional time to file your return, file Form 4868 to obtain 4 additional months to file. Then, file Form 1040 by October 16.
However, if you’re a participant in a combat zone, you may be able to further extend the filing deadline. See Pub. 3, Armed Forces' Tax Guide.
Individuals.(p4)
Make a payment of your 2017 estimated tax if you’re not paying your income tax for the year through withholding (or won't pay in enough tax that way). Use Form 1040-ES. This is the second installment date for estimated tax in 2017. For more information, see Pub. 505.
Corporations.(p4)
Deposit the second installment of estimated income tax for 2017. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
taxmap/pubs/p509-000.htm#en_us_publink100034270

Third Quarter(p4)

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The third quarter of a calendar year is made up of July, August, and September.
July 10
Employees who work for tips.(p4)
If you received $20 or more in tips during June, report them to your employer. You can use
Form 4070.
August 10
Employees who work for tips.(p4)
If you received $20 or more in tips during July, report them to your employer. You can use
Form 4070.
September 11
Employees who work for tips.(p4)
If you received $20 or more in tips during August, report them to your employer. You can use Form 4070.
September 15
Individuals.(p5)
Make a payment of your 2017 estimated tax if you’re not paying your income tax for the year through withholding (or won't pay in enough tax that way). Use Form 1040-ES. This is the third installment date for estimated tax in 2017. For more information, see Pub. 505.
Partnerships.(p5)
File a 2016 calendar year return (Form 1065). This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see March 15. Provide each partner with a copy of their final or amended Schedule K-1 (Form 1065) or substitute Schedule K-1 (Form 1065).
S corporations.(p5)
File a 2016 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you timely requested an automatic 6-month extension of time to file the return. Otherwise, see March 15. Provide each shareholder with a copy of their final or amended Schedule K-1 (Form 1120S) or substitute Schedule K-1 (Form 1120S).
Electing large partnerships.(p5)
File a 2016 calendar year return (Form 1065-B). If required, provide each partner with an amended copy of their Schedule K-1 (Form 1065-B) or substitute Schedule K-1 (Form 1065-B). This due date applies only if you timely requested a 6-month extension of time to file the return. Otherwise, see March 15. Provide each partner with a copy of their final or amended Schedule K-1 (Form 1065-B) or substitute Schedule K-1 (Form 1065-B).
Corporations.(p5)
Deposit the third installment of estimated income tax for 2017. A worksheet, Form 1120W, is available to help you estimate your tax for the year.
taxmap/pubs/p509-000.htm#en_us_publink100034278

Fourth Quarter(p5)

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The fourth quarter of a calendar year is made up of October, November, and December.
October 10
Employees who work for tips.(p5)
If you received $20 or more in tips during September, report them to your employer. You can use Form 4070.
October 16
Individuals.(p5)
If you have an automatic 6-month extension to file your income tax return for 2016, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.
Corporations.(p5)
File a 2016 calendar year income tax return (Form 1120) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see April 18.
November 13
Employees who work for tips.(p5)
If you received $20 or more in tips during October, report them to your employer. You can use Form 4070.
December 11
Employees who work for tips.(p5)
If you received $20 or more in tips during November, report them to your employer. You can use Form 4070.
December 15
Corporations.(p5)
Deposit the fourth installment of estimated income tax for 2017. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
taxmap/pubs/p509-000.htm#en_us_publink100034286

Fiscal-Year Taxpayers(p5)

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If you use a fiscal year (rather than the calendar year) as your tax year, you should change some of the dates in this calendar. Use the following general guidelines to make these changes.
Deposit
The 3 months that make up each quarter of a fiscal year may be different from those of each calendar quarter, depending on when the fiscal year begins. Also see Saturday, Sunday, or legal holiday, earlier.
taxmap/pubs/p509-000.htm#en_us_publink100034288

Individuals(p5)

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taxmap/pubs/p509-000.htm#en_us_publink100034289

Form 1040.(p5)

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This form is due on the 15th day of the 4th month after the end of your tax year. Form 4868 is used to request an extension of time to file Form 1040.
taxmap/pubs/p509-000.htm#en_us_publink100034290

Estimated tax payments (Form 1040-ES).(p5)

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Payments are due on the 15th day of the 4th, 6th, and 9th months of your tax year and on the 15th day of the 1st month after your tax year ends.
taxmap/pubs/p509-000.htm#en_us_publink100034291

Partnerships(p5)

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taxmap/pubs/p509-000.htm#en_us_publink100034292

Form 1065.(p5)

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This form is due on the 15th day of the 3rd month after the end of the partnership's tax year. Provide each partner with a copy of their Schedule K-1 (Form 1065) or substitute Schedule K-1 (Form 1065) by the 15th day of the 3rd month after the end of the partnership's tax year. Form 7004 is used to request an automatic 6-month extension of time to file Form 1065.
taxmap/pubs/p509-000.htm#en_us_publink100034293

Form 1065-B (electing large partnerships).(p5)

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This form is due on the 15th day of the 3rd month after the end of the partnership's tax year. Provide each partner with a copy of their Schedule K-1 (Form 1065-B) or substitute Schedule K-1 (Form 1065-B) by the first March 15 following the close of the partnership's tax year. This due date for filing Schedule K-1 (Form 1065-B) applies even if the partnership requests an extension of time to file Form 1065-B. Form 7004 is used to request an automatic 6-month extension of time to file Form 1065-B.
taxmap/pubs/p509-000.htm#en_us_publink100034294

Corporations and S Corporations(p5)

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taxmap/pubs/p509-000.htm#en_us_publink100034295

Form 1120 (or Form 7004).(p5)

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This form is due on the 15th day of the 4th month after the end of the corporation’s tax year. However, a corporation with a fiscal tax year ending June 30 must file by the 15th day of the 3rd month after the end of its tax year. A corporation with a short tax year ending anytime in June will be treated as if the short year ended on June 30, and must file by the 15th day of the 3rd month after the end of its tax year.
Form 7004 is used to request an automatic 6-month extension of time to file Form 1120. However, corporations with a fiscal tax year ending June 30, or a short tax year treated as if the short year ended June 30 will use Form 7004 to request an automatic 7-month extension of time to file Form 1120.
taxmap/pubs/p509-000.htm#en_us_publink100046378

Form 1120S (or Form 7004).(p5)

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This form is due on the 15th day of the 3rd month after the end of the corporation's tax year. Provide each shareholder with a copy of their Schedule K-1 (Form 1120S) by the 15th day of the 3rd month after the end of the corporation's tax year. Form 7004 is used to request an automatic 6-month extension of time to file Form 1120S.
taxmap/pubs/p509-000.htm#en_us_publink100034296

Estimated tax payments.(p5)

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Payments are due on the 15th day of the 4th, 6th, 9th, and 12th months of the corporation's tax year.
taxmap/pubs/p509-000.htm#en_us_publink100034297

Form 2553.(p5)

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This form is used to choose S corporation treatment. It is due no more than two months and 15 days after the beginning of the tax year the election is to take effect or at any time during the preceding tax year.