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Income Taxes
9 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
Income tax provisions for interim quarterly periods are based on an estimated annual effective income tax rate calculated separately from the effect of significant, infrequent or unusual discrete items related specifically to interim periods. The following summarizes income tax expense and the effective tax rate in each interim period:

Three months endedNine months ended
June 30June 30
(In millions)2021202020212020
Income tax expense$31 $19 $83 $68 
Effective tax rate percentage24.2 %24.4 %24.8 %25.9 %

The decreases in effective tax rates from the prior year periods were principally driven by favorable discrete tax benefits in the current year. In addition, tax reform legislation enacted in the prior year resulted in lower current year taxes and unfavorable discrete activity in the nine months ended June 30, 2020. Higher pre-tax earnings in the three and nine months ended June 30, 2021 more than offset these benefits resulting in increased tax expense for the current year periods.

From a combination of statute expirations and anticipated audit settlements in the next twelve months, Valvoline currently estimates a decrease in the range of $25 million to $35 million in indemnity obligations due to the Company's former parent, which is expected to include certain unrecognized tax benefits.