When using the Procare W2 / 1099 Software there are two options for Social Security and Medicare as follows:
Automatically Corrected (recommended setting)
"Automatically corrected" means the exact amounts that should have been withheld will be used. This is determined by multiplying each employee's taxable earnings, for the
entire year, by the appropriate rates for Social Security and Medicare. The results are more precise than adding together withholdings from individual checks. Any differences are accounted for by adjusting the Federal Income Tax withholding. Therefore, don't be concerned if the amounts withheld for Social Security, Medicare, and Federal Income Tax on the W2 vary slightly from the totals on the employee's last pay stub of the year. Typically, the differences will be a matter of cents, not dollars.
Exactly as Entered
"Exactly as entered" means the amounts withheld on individual paychecks throughout the year will be added together and imported exactly the way they were recorded. This result is likely to be slightly over or under the correct amount for the full year.
Special Note for 2011 W2s
In 2011 the employee share of Social Security dropped from 6.2 to 4.2 percent. If you withheld at the old rate, for a portion of the year, the difference may be more significant than a few cents. Using the "Automatically Corrected" option is strongly encouraged in order to have correct withholdings reported. If you over withheld, any extra will be reported in the Federal Income Tax withholding box, resulting in a larger refund (or less owed) when the person files their personal income taxes.
tags: KB0505, automatically correct, rounding, faq135