Was this really a letter from the IRS or a state Department of Revenue? If so, which state? "Total Retirement income" is not a phrase that jumps to mind vis-à-vis the IRS.
Line 15 on the 1040 is taxable income, not total income (which is line 9).
I suspect that when you say "total retirement income", you really mean is total income which is only from retirement sources, which is somewhat confusing.
The letter should show what fields they used to arrive at taxable income for line 15. So why lesser field is different from your actual return? Line 15 is pretty clearly the result of addition and subtraction of the line above.
In any case, If you ever get a letter form the IRS or a state revenue department, please visit our TurboTax Audit Support Center. They will explain the letter to you and suggest how to respond to it.
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