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merging transactions in 8949
From the instructions: If you do not need to make any adjustments to the basis or type of   gain or loss (short-term or long-term) reported to you on Form 1099-B   (or substitute statement) or to your gain or loss for any transactions   for which basis has been reported to the IRS (normally reported on   Form 8949 with box A checked), you do not have to include those   transactions on Form 8949. Instead, you can report summary information   for those transactions directly on Schedule D. For more information,   see Exception 1, later. However, in case of ESPP and RSU, it is likely that you actually do need to make adjustments. Since 2014, brokers are no longer required to track basis for these, so you better check that the calculations are correct. If the numbers are right and you just summarized instead of reporting each on a separate line, its probably not an issue. As long as the gains reported are correct, no-one will waste their time on you. If you missed several thousand dollars because of incorrect calculations, some might think you were intentionally trying to hide something by aggregating and may come after you.