Report the 1099B. The basis on the 1099B is either missing or probably wrong. The correct basis is the amount of money that was added to your W2 as wages plus any brokerage fees to buy/sell.
You used the word taxes for 1099B and I think you meant basis. If you enter the numbers for a sale that is on your W2 and 1099, it should be pretty close, maybe even a small loss. A big jump in what you owe sounds like the wrong basis.
I want to urge you to create a financial notebook that is kept separate from your tax return. Keep it safe and each year, add your year-end statements from all your financial accounts plus a copy of your W2’s, 5498, and any 8606.
This will protect you down the road as proof of your basis in your various investments. As you go through life, rollovers, ESPP & RSU sales, and more will be captured for you.
When you do sell, your notebook will be invaluable with knowing what was first, the order, the basis, and the lot size for stocks.
@knrichie
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