One of my transactions shows a cost basis that's about $100 more than it should be, but it also shows a wash sale for the same exact amount. So even thou it doesn't affect the tax I owe, is this something that I should ask IB to fix? If I ask them, I'm concerned that they might screw up the 1099 in some other way, or that they won't correct it in time for the July 15 tax deadline. It was only 2 weeks ago that IB amended the 1099 by fixing a bunch of erroneous transactions they initially listed as noncovered securities. IB had the same error last year, but didn't bother fixing it then.