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:

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Upcoming Tax Dates

August 1 — Form 720 taxes
File Form 720 for the second quarter of 2016.

August 1 — Wagering tax
File Form 730 and pay the tax on wagers accepted during June.

August 1 — Social security, Medicare, and withheld income tax
File Form 941 for the second quarter of 2016. Deposit or pay any undeposited tax under the accuracy of deposit rules.

August 1 — Certain small employers
Deposit any undeposited tax if your tax liability is $2,500 or more for 2016 but less than $2,500 for the second quarter.

August 1 — Federal unemployment tax
Deposit the tax owed through June if more than $500.

August 1 — All employers
If you maintain an employee benefit plan, such as a pension, profitsharing, or stock bonus plan, file Form 5500 or 5500EZ for calendar year 2015. If you use a fiscal year as your plan year, file the form by the last day of the seventh month after the plan year ends.

August 10 — Employees who work for tips
If you received $20 or more in tips during July, report them to your employer Details

August 10 — Social security, Medicare, and withheld income tax
File Form 941 for the second quarter of 2017. This due date applies only if you deposited the tax for the quarter timely, properly, and in full.

August 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 July.

August 12 — Regular method taxes
Deposit the tax for the last 16 days of July.

August 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in July.

August 15 — Nonpayroll withholding
If the monthly deposit rule applies, deposit the tax for payments in July.

August 25 — 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 July.

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

August 31 — Wagering tax
File Form 730 and pay the tax on wagers accepted during July.

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