I transferred stock brokers - how to account for and adjust cost basis that may be counted twice?
Early last year I switched stock brokers and transferred my remaining positions to my new broker. Both of my 1099B from both brokers total the cost basis for the same shares. Both 1099 were uploaded to TurboTax and automatically filled in the designated fields. How do I adjust for this, or do I even need to? I believe with the way it is now, I may be paying less taxes than I'm supposed to, but I'm not sure how to adjust for it as I don't really have a way of knowing the exact number of shares of the stocks that were transferred.