Form 940 is provided by employers to the Feds and reports the amount of FUTA (Federal Unemployment Tax) that they must pay for their employees. The detail shows which employees (by SS # of course) are included for what amounts of FUTA taxable income. FUTA Taxable income is different than other types of taxable income by an assortmetn of things....different to FICA taxable income most importantly by it not having a maximum amount that contributions stop after (FICA stops after 97.5K (102K in 2008) of income, FUTA doesn't).
So, how exactly the government or it's computers (most employers are required to file this electronically), use the form or the information on the form, and the payment that must have been made it represents....other than generally to calculate and fund the Federal portion of unemeployment insurance coverages....?