When there is more book depreciation than tax depreciation that means that more of your income s taxable, so you add it back. If you had net income of 10,000, your depreciation per book was 18,000, depreciation per tax is 10,000, that 8k difference needs to be added back to book income.
Assuming a 25% Marginal Rate.
Book income 10,000 *25% 2,500
Tax income 18,000 * 25% = 4,500
2,000 DTA
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