Answer:
total income tax expense = $800,000 (net pretax income) x 21% (income tax rate) = $168,000 ⇒ this number must be reported in its GAAP financial statements
current income tax expense = ($800,000 - $80,000) x 21% = $151,200 ⇒ this is the amount of tax due for the current period
deferred tax liability = $80,000 x 21% = $16,800 ⇒ results from reporting differences (GAAP rules) and the rules that the IRS uses to collect axes, e.g expensing assets or bonus depreciation