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Why do 1099 forms take so long for brokerages to prepare and send out?
The simple answer is that brokerages have to close the books at the end of the year before they can send out the tax forms (what this entails is off topic for this site). I doubt that printing and mailing the forms takes very long. It is simply the process of reconciling the books so they don't have to send out corrected forms if errors are corrected during that reconciliation process.