45 . Charles and Joan Thompson file a joint return . In 2006 , they had taxable income of $92, 370 and paid tax of $16, 209. Charles is an advertising executive and Joan Is a college professor . During the fall ZOUG semester , Joan is planning to take a leave of absence without pay . The Thompsons expect their taxable income to drop to $70, 0OD in 2007 . They expect their 2007 tax liability will be $10, 35.4, which will be the approximate am count of their withholdings . Joan anticipates that she will work on academic research during the fall semester . During September , Joan decides to perform consulting services for some local businesses . Charles and Joan had not previously anticipated this development . Joan is paid a total of $35, 000 during October , November , and December for her work . What estimated tax payments are Charles and Joan required to make , if ANY , for tax Year 2007? Do You anticipate that the Thompsons will be required to pay all underpayment penalty when they file their 2007 tax return ?" Explain Your answer"