The Affordable Care Act applies an approach to common ownership that also applies for other tax and employee benefit purposes. This longstanding rule generally treats companies that have a common owner or similar relationship as a single employer. These are aggregated companies. The law combines these companies to determine whether they employ at least 50 full–time employees including full–time equivalents.

If the combined employee total meets the threshold, then each separate company is an applicable large employer. Each company – even those that do not individually meet the threshold – is subject to the employer shared responsibility provisions.

These rules for combining related employers do not determine whether a particular company owes an employer shared responsibility payment or the amount of any payment. The IRS will determine payments separately for each company.

For more information about how the employer shared responsibility provisions may affect your company, see our Questions and Answers on IRS.gov/aca. For details about how to determine if you are an applicable large employer, including the aggregation rules, see Determining If You Are an Applicable Large Employer.

September 2017
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Upcoming Tax Dates

September 5 — Everyone
Federal Holiday (Labor Day) Details

September 10 — Communications and air transportation taxes under the alternative method.
Deposit the tax included in amounts billed or tickets sold during the first 15 days of August.

September 11 — Employees who work for tips
If you received $20 or more in tips during August, report them to your employer Details

September 14 — Regular method taxes
Deposit the tax included in amounts billed or tickets sold during the last 16 days of August.

September 15 — Individuals
Make a payment of your 2017 estimated tax if you are not paying your income tax for the year through withholding (or will not pay in enough tax that way). Use Form 1040-ES. This is the third installment Details

September 15 — S Corporations
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 Details

September 15 — Partnerships
File a 2016 calendar year return (Form 1065). This due date applies only if you were given an additional 5-month extension Details

September 15 — Corporations
Deposit the third installment of estimated income tax for 2016 Details

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 27 — Communications and air transportation taxes under the alternative method.
Deposit the tax included in amounts billed or tickets sold during the last 16 days of August.

September 29 — Regular method taxes
Deposit the tax for the first 15 days of September.

September 29 — Regular method taxes (special September deposit rule)
Deposit the tax for the period beginning September 16 and ending September 26.

September 29 — Communications and air transportation taxes under the alternative method (special September deposit rule).
Deposit the tax included in amounts billed or tickets sold during the period beginning September 1 and ending September 11.

September 30 — Wagering tax
File Form 730 and pay the tax on wagers accepted during August.

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