I believe what you mean is you added cost basis to some investment sales that would reduce your gains but when you did so your tax due increased. That can happen when you have tax credits that are sensitive to an increase in your income, such as the earned income credit. That credit reduces your tax but it can decrease when your income increases and if it does so in an amount greater than the decrease in your tax, your tax due can go up.
I suggest you look at your Form 1040 and schedules 1 to 3 to see what changes when you add to your cost basis to better understand why your tax is increasing.
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online while working in your program
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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