Without a complete view of the books, I'm assuming the $12,000 difference is the tax profit. That would be shown as retained earnings on a corporate balance sheet. You don't specify what from of business or what tax form you're filing, but here is a link to a Form 1120.
You can review the balance sheet...for other forms, they will have a similar item, called capital account, etc. that would be similar to retained earnings.
https://www.irs.gov/pub/irs-pdf/f1120.pdf
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