Tax Return Due Dates for 2017 Business Taxes - UPDATED

Including Due Dates for Extended Business Tax Returns

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2017 Tax Return Due Dates for Business Types  

Sole Proprietorship and Single-member LLC returns on Schedule C: April 17, 2018

Partnership returns  on Form 1065 with Schedule K-1s: March 15, 2018  

S corporation returns on Form 1120 S: March 15, 2018

C corporation returns on Form 1120: for December 31 year-end corporations, the deadline is April 17, 2018.

Extension Deadlines for 2017 Business Tax Returns

Schedule C for sole proprietors and single-member LLC's: extension until October 16 2017 (no change) filed with personal tax return

Partnership extension deadline is September 17, 2018 (no change)

S corporation extension deadline is September 17, 2018 (no change)

Corporation extension deadline is October 15, 2016 (automatic extension allowed)

Changes: New Tax Return Due Dates for Partnership and C Corporation Returns

Partnership Tax Returns:  Effective with the 2016 tax year (filing in 2017), partnership tax returns, filed on Form 1065, must be filed by the 15th day of the third month after the tax year end date. For most partnership returns, that's March 15. (The previous due date was April 15). The earlier deadline gives partners a chance to receive Schedule K-1's before the personal tax return due date. 

C Corporation Tax Returns: Effective with the 2016 tax year (filing in 2017), there are new deadlines for filing corporate tax returns on Form 1120, depending on the corporation's fiscal (tax) year 

  • If fiscal year-end is December 31, the new deadline for 2017 returns:  April 17, 2018. 
  • Fiscal year end other than December 31 is the 15th day of the 4th month after year end

How Tax Return Due Dates are Determined Each Year

If the tax return due date falls on a weekend or holiday, the due date is moved to the first following work day; for example, if April 15 is on Sunday, the due date is Monday, April 16.

The official federal income tax return due date for personal and partnership taxes is April 15. BUT, in 2018 April 15 is on a Sunday, and Monday, April 17, is a holiday in the District of Columbia, so the return is due on Tuesday, April 17. 

More Details on 2017 Business Tax Return Due Dates

Here is a list of the types of business entities and their tax return due dates for 2016 tax returns:

Sole Proprietorship

A sole proprietorship business is an extension of the person running the business, so its year end is December 31, and the tax return due date is the same as the individual's - April 17 in 2018. Sole proprietor businesses file their business income tax return on Schedule C, which is part of the group of forms and schedules that go along with the person's personal tax return.

The due date for 2016 Schedule C is April 17, 2018, the same as your individual tax return date.

Single-member LLC

A single member LLC (that is, an LLC with only one owner) is taxed like a sole proprietorship, using Schedule C to calculate net income, so the tax returns are due and taxes are payable on April 15, for the prior year. The due date for 2015 Schedule C forms, along with the owner's personal tax return, is April 17, 2018.

Partnership

A partnership return is filed as an information return on Form 1065, and tax is owed on the individual partner tax return. Form 1065 is now due on 15th day of the 3rd month after the end of the partnership's tax year.

For a December 31, 2015 year end, the due date is March 15, 2017. For 2026 tax return filing, the partnership return due date is March 15, 2018. March 15 is also the due date for Individual partners to receive Schedule K-1 showing their individual share of the partnership income or loss, to be filed in April on their personal tax returns.

Multiple-member Limited Liability Company (LLC)

Multiple-member LLCs are taxed as partnerships, so the partnership filing and payment regulations above apply, including the March 15, 2018 deadline Schedule K-1.

Corporation

A corporation that has not filed a Subchapter S election may choose any convenient date as their year end (usually a quarter end date).

For 2017 tax year, corporation tax returns are due and taxes are payable on the 15th day of the fourth month after the end of the company's fiscal (financial) year. So, a corporation with a year-end date of December 31 must file and pay taxes by April 17, 2018, for December 31, 2017 year-end corporations.

Subchapter S Corporation 

Corporations which have filed a subchapter S election are taxed on the individual income tax returns of the owners. So an S corporation must usually take a calendar year end date (December 31) unless the corporation can establish a reasonable business purpose for a different date. The filing date and tax return due date is the same as for other corporations (March 15, 2018 for a 2017 December 31 tax year end.) 

For More Information on Other Tax Return Deadlines

Tax Planning at The Balance has information on tax deadlines for 2017 tax returns for all types of returns, including changes to other types of tax returns. 

Source for 2016 due date changes: Public Law 114-41