No, you are not correct.
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Maximum special allowance.
The maximum special allowance is:
$25,000 for single individuals and married individuals filing a joint return for the tax year,
$12,500 for married individuals who file separate returns for the tax year and lived apart from their spouses at all times during the tax year, and
$25,000 for a qualifying estate reduced by the special allowance for which the surviving spouse qualified.
If your modified adjusted gross income (MAGI) is $100,000 or less ($50,000 or less if married filing separately), you can deduct your loss up to the amount specified above. If your MAGI is more than $100,000 (more than $50,000 if married filing separately), your special allowance is limited to 50% of the difference between $150,000 ($75,000 if married filing separately) and your MAGI.
Generally, if your MAGI is $150,000 or more ($75,000 or more if you are married filing separately), there is no special allowance.
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Given what you've said here you could deduct losses of up to $25K on your income tax return. Just to reiterate, this is not a credit against your income tax liability, it's a reduction of your taxable income. The "tax effect" would depend on your marginal tax rate.
