Hi, turbo tax calculates my long term capital gain at a rate higher than 20% (at around 25%). Have this happened to you? If so do you know why? Thanks!

Do you have an additional tax amount on Schedule 2 line 8 with the box for Form 8960 checked on that line? If so, that's Net Investment Income Tax. It's an additional 3.8% tax on investment income above a certain amount.

Net Investment Income Tax applies if your Modified Adjusted Gross Income (MAGI) is more than $200,000 for single or head of household, $250,000 for married filing jointly or qualifying widow(er), or $125,000 for married filing separately.

@michelle-mao-zx - further, while the 'sweet spot' for long term capital gains is 15%, it can be 20% if you income exceeds $441,450 and at that level there is the additional 3.8% tax referred to by @rjs