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Income Taxes
 9 Months Ended
Oct. 29, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Our interim income tax provisions are based on the effective income tax rate expected to be applicable for the full fiscal year, adjusted for specific items that are required to be recognized in the period in which they occur. Deferred tax assets and liabilities are based on the enacted tax rate that will apply in future periods when such assets and liabilities are expected to be settled or realized.

Our effective income tax rate was 21.9% and 17.7% for the three months ended October 29, 2022 and October 30, 2021, respectively, and 20.8% and 17.2% for the nine months ended October 29, 2022 and October 30, 2021, respectively. The effective tax rate differs from the statutory rate primarily due to tax credits recognized, the impact of the vesting and exercise of share-based awards, and the difference in income tax rates from state to state where work was performed. The three and nine months ended October 29, 2022, includes approximately $1.8 million and $3.4 million, respectively, for tax benefits for credits related to tax filings for prior years. Additionally, the three and nine months ended October 30, 2021, includes approximately $3.0 million for incremental tax benefits for credits related to tax filings for prior periods. Other fluctuations in our effective income tax rate from the statutory rate each period are mainly attributable to changes in unrecognized tax benefits, tax law changes, and variances in non-deductible and non-taxable items.
During the first quarter of fiscal 2023, we were notified by the Internal Revenue Service that our federal income tax return for fiscal 2016 was selected for examination due to the net operating loss carryback claim filed in fiscal 2021. In addition, fiscal year 2020 was selected for examination in the second quarter of fiscal 2022. We believe our provision for income taxes is adequate; however, any assessment may affect our results of operations and cash flows.