The IRS Form 1099-K is a tax report that broker-dealers (and some cryptocurrency exchanges such as Coinbase, Gemini, Robinhood, etc.) generate. They keep one copy for themself, send one copy to you (the user), and one copy to the IRS. This form essentially shows aggregate transaction volume per month.
Aggregate transaction volume is a completely different number than capital gains, which is what is needed to file your taxes on IRS Form 8949 (which is what is generated by CoinTracker). The 1099-K helps the IRS understand which are high transaction users, however those numbers are not actually used in your tax filing.
See more information on which tax forms are required.
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