Doesn't sound like you're in the 20% LT gains bracket.
So maybe AMT? You should be able to see whether you're getting AMT in turbotax?
What triggers the AMT for tax years 2018 to 2025?
These are some of the most likely situations:
- Having a high household income. If your household income is over the phase-out thresholds ($1,047,200 for married filing jointly and $523,600 for everyone else), and you have a significant amount of itemized deductions, the AMT could still affect you.
- Realizing a large capital gain. Long-term gains (e.g., profits from selling a home or other investments) are taxed at the same rate under both systems, but capital gains could put you over the AMT exemption threshold. That could cause the AMT to kick in, which means you may not be able to deduct state income taxes you paid.
- Exercising stock options. Normally, exercising qualified employee stock options (also called incentive stock options or ISOs) to buy stock at a discounted price isn't a taxable event until you sell the shares for a profit. The AMT, however, creates a paper profit that’s taxable even though you won't receive the actual profit until you sell the shares.
from https://www.schwab.com/resource-center/insights/content/amt-triggers
