Jeannie is doing her tax returns and wants to pay tax on all the money she has earned and she makes no deductions.
Al is aghast at this and makes some deductions to reduce Jeannie's tax bill.
Jeannie feels guilty and overpays her tax. When the IRS queries the overpayment or the tip as Jeannie calls it. They request Jeannie comes to see them.
Al and Liz believe that Jeannie has been called in for faking her expenses.
It is another story involving mix ups and miscommunication. It also has Al trying to retrieve a letter from a postbox.
There is a nice avantgarde dance routine from both Jeannie and Al which is the best thing about the episode.