why am i being charged $40.00 for under paying my 2011 taxes ,is it because i have extra money with held and it is not enough .if i had nothing extra taken out of my pay would i still be charged this money ?

my daughter s husbent died with no assets and left her with a irs debt she has no job two small kids the only money she gets is from ss for the kids but because they filed joint ly some how they owed the irs money from his truck driveing job when he was working irs wants to take money from what she gets for the kids wh...more