It’s always a good idea to check your withholdings and payments mid-tax year to make sure you avoid any surprises come tax filing time. Especially if you have incurred a life event (change in marital status, birth of child, getting or losing a job, or purchasing a home for example). The IRS has an online withholding calculator to help you do this check-up yourself. Visit their Withholding Calculator page here 
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If you are self-employed, you need to check and make sure you have filed estimated taxes and investigated the new “additional medicare tax” that took effect January 1, 2013.
For more detailed information on this and other subjects, visit the recent IRS article on this topic here .
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