September 2018 Business Due Dates

September 17 - S Corporations

File a 2017 calendar year income tax return (Form 1120S) 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 1120S) or a substitute Schedule K-1.

September 17 - Corporations 

Deposit the third installment of estimated income tax for 2018 for calendar year

September 17 -  Social Security, Medicare and withheld income tax

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

September 17 - Nonpayroll Withholding

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

September 17 - Partnerships

File a 2017 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 17 - Electing Large Partnerships 

File a 2017 calendar year return (Form 1065-B). This due date applies only if you were given a 6-month extension. March 15 was the due date for furnishing Schedules K-1 or substitute Schedule K-1 to the partners.



Share this article...

Want tax & accounting tips and insights?

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 .

Our Team

At IAM Accounting LLC, we take pride in our diverse and experienced team of professionals, each dedicated to providing exceptional service in accounting, tax planning, payroll, and financial management. Our team members bring a wealth of knowledge from various financial backgrounds, working together to ensure that every client receives the personalized attention and expertise they deserve. From managing complex accounting operations to providing tax-saving strategies, we’re here to help you achieve your financial goals with precision and care.

  • Ibrahim Mohammed

    Founder & Tax Strategist

    Ibrahim leads IAM Accounting LLC, offering expert tax strategies and financial guidance to help clients reduce tax liabilities and achieve their financial goals.

  • Jasleen Daswal

    Controller

    Jasleen is a highly skilled Controller with over five years of experience as a Chartered Accountant. She ensures accurate financial management and oversees accounting operations.

  • Sahil Shaikh

    Chartered Accountant & Tax Preparer

    Sahil is a Chartered Accountant and tax preparer with expertise in tax compliance, financial reporting, and strategic tax planning, helping clients optimize their financial outcomes.

  • Ankit Gupta

    Accounts Associate

    Ankit brings a wealth of experience in finance and accounting, providing key support in day-to-day financial operations to ensure accuracy and compliance.

  • Neha Sharma

    Key Accounts Manager

    Neha manages our most valued client relationships, with over four years of experience as a Chartered Accountant, ensuring that client needs are met efficiently and professionally.

  • Michael Holsinger

    Payroll Representative, ADP Partner

    Michael is our dedicated payroll expert and ADP partner, managing payroll processes with precision and helping clients navigate payroll services seamlessly.

Welcome to IAM Accounting's Virtual Assistant We're here to assist you with all your tax and accounting needs.
Hello! How can I assist you today with you tax or accounting inquiries?
Please fill out the form and our team will get back to you shortly The form was sent successfully