I recently input the numbers for a client with a large capital gain.
He questioned the tax liability, it seemed very high.
I discovered that the calculator taxed long term capital gains at ordinary rates. I filed a report with TaxAct. Here is their response:
As the tax rate for capital gains and dividends depends on many variables (including whether the capital gains are treated as ordinary income) the Tax Calculator will use the tax rates for ordinary income when completing the scenario.
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