Starting in 2013, you 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:

1. The Additional Medicare Tax is 0.9 percent. It applies to the amount of your wages, self-employment income and railroad retirement (RRTA) compensation that is more than a threshold amount. The threshold amount that applies to you is based on your filing status. If you’re married and file a joint return, you must combine your spouse’s wages, compensation, or self-employment income with yours to determine if you exceed the “married filing jointly” threshold.
2. 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

3. You must combine wages and self-employment income to determine if your income exceeds the threshold. You do not consider a loss from self-employment when you figure this tax. You must compare RRTA compensation separately to the threshold. See the instructions for Form 8959, Additional Medicare Tax, for examples.
4. Employers must withhold this tax from your wages or compensation when they pay you more than $200,000 in a calendar year, without regard to your filing status, wages paid to you by another employer, or income that you may have from other sources. Your employer does not combine the wages for married couples to determine whether to withhold Additional Medicare Tax.
5. You may owe more tax than the amount withheld, depending on your filing status and other income. In that case, you should make estimated tax payments or request additional income tax withholding using Form W-4, Employee’s Withholding Allowance Certificate. 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.
6. 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. Enter “Additional Medicare Tax” in the search box. You can also get forms and publications on IRS.gov or call 800-TAX-FORM (800-829-3676).

Additional IRS Resources:

• Find out if Additional Medicare Tax applies to you
• Questions and Answers for the Additional Medicare Tax
• Tax Topic 560 – Additional Medicare Tax

WASHINGTON — The Internal Revenue Service reminds U.S. citizens and resident aliens, including those with dual citizenship who have lived or worked abroad during all or part of 2013, that they may have a U.S. tax liability and a filing requirement in 2014.

The filing deadline is Monday, June 16, 2014, for U.S. citizens and resident aliens living overseas, or serving in the military outside the U.S. on the regular due date of their tax return. Eligible taxpayers get one additional day because the normal June 15 extended due date falls on Sunday this year. To use this automatic two-month extension, taxpayers must attach a statement to their return explaining which of these two situations applies. See U.S. Citizens and Resident Aliens Abroad for details.

Nonresident aliens who received income from U.S. sources in 2013 also must determine whether they have a U.S. tax obligation. The filing deadline for nonresident aliens can be April 15 or June 16 depending on sources of income. See Taxation of Nonresident Aliens on IRS.gov.

Federal law requires U.S. citizens and resident aliens to report any worldwide income, including income from foreign trusts and foreign bank and securities accounts. In most cases, affected taxpayers need to fill out and attach Schedule B to their tax return. Certain taxpayers may also have to fill out and attach to their return Form 8938, Statement of Foreign Financial Assets.

Part III of Schedule B asks about the existence of foreign accounts, such as bank and securities accounts, and usually requires U.S. citizens to report the country in which each account is located.

Generally, U.S. citizens, resident aliens and certain nonresident aliens must report specified foreign financial assets on Form 8938 if the aggregate value of those assets exceeds certain thresholds. See the instructions for this form for details.

Separately, taxpayers with foreign accounts whose aggregate value exceeded $10,000 at any time during 2013 must file electronically with the Treasury Department a Financial Crimes Enforcement Network (FinCEN) Form 114, Report of Foreign Bank and Financial Accounts (FBAR). This form replaces TD F 90-22.1, the FBAR form used in the past. It is due to the Treasury Department by June 30, 2014, must be filed electronically and is only available online through the BSA E-Filing System website. For details regarding the FBAR requirements, see Report of Foreign Bank and Financial Accounts (FBAR).

Taxpayers abroad can now use IRS Free File to prepare and electronically file their returns for free. This means both U.S. citizens and resident aliens living abroad with adjusted gross incomes (AGI) of $58,000 or less can use brand-name software to prepare their returns and then e-file them for free. A second option, Free File Fillable Forms the electronic version of IRS paper forms, has no income limit and is best suited to people who are comfortable preparing their own tax return. Check out the e-file link on IRS.gov for details on the various electronic filing options.

A limited number of companies provide software that can accommodate foreign addresses. To determine which will work best, view the complete Free File Software list and the services provided. Both e-file and Free File are available until Oct. 15, 2014, for anyone filing a 2013 return.

Any U.S. taxpayer here or abroad with tax questions can use the online IRS Tax Map and the International Tax Topic Index to get answers. These online tools assemble or group IRS forms, publications and web pages by subject and provide users with a single entry point to find tax information.