Disclaimer: CoinTracker is provided for informational purposes only. This service is not intended to substitute for tax, audit, accounting, investment, financial, nor legal advice. For financial, tax, or legal advice please consult your own professional. The information on CoinTracker is subject to change without notice. All information is provided "as is." CoinTracker disclaims any responsibility for the accuracy or adequacy of any positions taken by you in your tax returns. Please see our full disclaimer.
The IRS Form 1099-K is a tax report that broker-dealers (and some cryptocurrency exchanges such as Coinbase and Gemini) 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 here.