September 2020 Business Due Dates

September 15 - S Corporations

File a 2019 calendar year income tax return (Form 1120-S) and pay any tax due. This due date applies only if you requested an automatic 6-month extension. Provide each shareholder with a copy of K-1 (Form 1120-S) or a substitute Schedule K-1.

September 15 - Corporations 

Deposit the third installment of estimated income tax for 2020 for calendar year

September 15 -  Social Security, Medicare and Withheld Income Tax

If the monthly deposit rule applies, deposit the tax for payments in August.

September 15 - Nonpayroll Withholding

If the monthly deposit rule applies, deposit the tax for payments in August.

September 15 - Partnerships

File a 2019 calendar year return (Form 1065). This due date applies only if you were given an additional 5-month extension. Provide each partner with a copy of K-1 (Form 1065) or a substitute Schedule K-1.

September 30 - Fiduciaries of Estates and Trusts

File a 2019 calendar year return (Form 1041). This due date applies only if you were given an extension of 5 1/2 months. If applicable, provide each beneficiary with a copy of K-1 (Form 1041) or a substitute Schedule K-1.




Share this article...

Want our best tax and accounting tips and insights delivered to your inbox?

Sign up for our newsletter.

I confirm this is a service inquiry and not an advertising message or solicitation. By clicking “Submit”, I acknowledge and agree to the creation of an account and to the and .
I consent to receive SMS messages

Worcester Office

Looking for tax help in Worcester, Massachusetts? You can find us at:

645 Chandler Street
Worcester, Massachusetts 01602

Falmouth Office

Looking for tax help in Falmouth? You can find us at:

230 Main Street, Suite 3A
Falmouth, Massachusetts 02540
We’re available to take your tax tasks off your hands, today.

Call us at (508) 754-2665 (Worcester office) or at (774) 763-2776 (Falmouth office) To get started