We received an IRS tax notice saying that they corrected our joint return and we owed additional $3,000 in taxes. They corrected my wife's taxable social security disability benefits on line 20b of the
1040 form. My wife was injured at work in 2005 and was receiving worker comp benefits in 2005, 2006, 2007 and part of 2008. She applied for social security disability in 2007 and the application was on hold since she was receiving workers comp benefits. In early 2008, worker comp cut her off. In September 2008, social security started paying her disability benefits. When we received her 2008 SSA-1099 statement, although she was only paid about $6,000 gross in social security benefits, the SSA statement shows over $51,000 as income in box 3. After asking a couple of tax preparers about this, I found out that social security made the disablility benefits retroactive to
2005, and all her worker comp benefits in previous years became taxable in 2008. I read Publication 915 (social security benefits) and found a section on Lump Sum Election. It says that if the box 3 amount in the SSA statement included previous years' benefits, and box
5 of the statment shows a breakdown of the benefits by year (which it does - it shows the 2005, 2006, 2007 and 2008 amounts), we could re- calculate the taxes using her 2005, 2006 and 2007 incomes based on the itemized amounts by year shown on box 5 of the SSA statement. We got married in 2007. Because of my income, her benefits in 2007 and 2008 were fully taxable (at 85% maximum). However, for 2005 and 2006, she was single and her only incomes were from worker comp (now converted social security disablity), we would not owe taxes on the benefits that she received in 2005 and 2006 since her incomes were too low. On our tax return, I reported $28,000 as taxable income for the benefits received in 2007 and 2008 on line 20b and wrote "LSE" (as lump sum election) next to line 20a as instructed in Pub 915. However, IRS corrected the amount to $44,000 (which is based on 85% of the $51,000 that she received from 2005-2008). So now we owe additional $3,000 in taxes.
Before I contact IRS, could you tell me how we should proceed addressing this and what implications that we may have by contesting the amount? I think I did the calculaitons correctly according to the Pub 915, but I don't want to get into any trouble since this situation has never occurred to me before. We thank you for your help in advance.