Line 15 is a total. Can you tell which line above they adjusted? Did you get any 1099R? You might have got the wrong taxable amount on line 4b and 5b. And if you get Social Security if they increase your income it can make more of ss taxable on line 6b.
Oh, if you got any 1099R it might be on the wrong line (4 or 5) so the IRS might think you didn't report it. Can you figure out where the difference is?
