26 CFR §31.3101-2 — -2 Rates and computation of employee tax.

1. (a)Old-Age, Survivors, and Disability Insurance. The rates of employee tax for Old-Age, Survivors, and Disability Insurance (OASDI) with respect to wages received in calendar years after 1983 are as follows (these regulations do not reflect off-Code revisions to the following rates):
2. (b)
   1. (1)Hospital Insurance. The rates of employee tax for Hospital Insurance (HI) with respect to wages received in calendar years after 1973 are as follows:
   2. (2)Additional Medicare Tax.
      1. (i)The rate of Additional Medicare Tax with respect to wages received in taxable years beginning after December 31, 2012, is as follows:
      2. (ii)Individuals are liable for Additional Medicare Tax with respect to wages received in taxable years beginning after December 31, 2012, which are in excess of:
3. (c)Computation of employee tax. The employee tax is computed by applying to the wages received by the employee the rates in effect at the time such wages are received.
4. (d)Effective/applicability date. Paragraphs (a), (b), and (c) of this section apply to quarters beginning on or after November 29, 2013.