Some taxpayers may be liable for an Additional Medicare Tax if your income exceeds certain limits. Here are six things that you should know about this tax:

  • Tax Rate. The Additional Medicare Tax rate is 0.9 percent.
  • Income Subject to Tax. The tax applies to the amount of certain income that is more than a threshold amount. The types of income include your Medicare wages, self-employment income and railroad retirement (RRTA) compensation. You must combine your wages and self-employment income to figure the tax. You do not consider a loss from self-employment purposes of this tax. You compare RRTA compensation separately to the threshold. See the instructions for Form 8959, Additional Medicare Tax, for more on these rules.
  • Threshold Amount. You base your threshold amount on your filing status. If you are married and file a joint return, you must combine your spouse's wages, compensation, or self-employment income with yours. Use the combined total to determine if your income exceeds your threshold. The threshold amounts are:
  • Filing Status Threshold Amount
    Married filing jointly $250,000
    Married filing separately $125,000
    Single $200,000
    Head of household $200,000
    Qualifying widow(er) with dependent child $200,000
  • Withholding / Estimated Tax. Employers must withhold this tax from your wages or compensation when they pay you more than $200,000 in a calendar year. If you are self-employed you should include this tax when you figure your estimated tax liability.
  • Underpayment of Estimated Tax. If you had too little tax withheld, or did not pay enough estimated tax, you may owe an estimated tax penalty. For more on this topic, see Publication 505, Tax Withholding and Estimated Tax.

If you owe this tax, file Form 8959, with your tax return. You also report any Additional Medicare Tax withheld by your employer on Form 8959. Visit IRS.gov for more on this topic.

Additional IRS Resources:

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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