Given your scenario, and assuming that you are filing Married Filing Jointly because you referenced "our taxable income", you are correct that you could sell $56,700 of stock with $0 cost basis and pay $0 capital gains taxes, but only assuming that these are long-term sales.
Here's a resource that confirms the long-term capital gains tax rates and brackets for tax year 2025:
TurboTax: A Guide to the Capital Gains Tax Rate: Short-term vs. Long-term Capital Gains Taxes
Great question!
[Edited 7/16/25 | 10:45 am PT]:
@user17525220452 - just a quick note: I ran this scenario in a test TurboTax tax return, and I can confirm the tax due did not change at all once I added in the long-term sale. You can test things out yourself using a dummy TurboTax Online tax return, TurboTax Desktop tax return, or by entering in some numbers in our TaxCaster Tax Calculator - just note that in all of these tools, the info is currently pointed to the 2024 tax year, so you may want to test it out using a sale of $54,050 instead of $56,700.
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