What will my Capital Gains Tax take into account? (UTMA, dividends, LT CG)

Your situation is complex, but I'll break it down and provide some clarity on how capital gains tax would likely be calculated for your UTMA account:

1. Cost Basis Adjustment:

The cost basis you're seeing in Fidelity is likely accurate. Here's why:

2. Capital Gains Calculation:

3. UTMA Specifics:

4. Trust Fidelity's Cost Basis:

5. Long-Term vs. Short-Term Gains:

6. Tax Reporting:

Given the complexity of your situation, it would be wise to consult with a tax professional who can review your specific circumstances and provide personalized advice. They can help ensure you're calculating and reporting your capital gains correctly.