Retirement Security for America's Domestic Workers Act of 2007 - Amends title II (Old Age, Survivors and Disability Insurance) of the Social Security Act and the Internal Revenue Code to provide that compensation paid for domestic services in an employer's private home will not be exempt from employment taxes unless such compensation is less than the greater of $1,500 or the amount of wages and self-employment income required for a quarter of coverage under the Social Security Act.