Comparison of 39 weeks ended October 29, 2022 to 39 weeks ended October 30, 2021
Net sales
Net sales increased $1.1 billion or 18.3%, to $7.0 billion for the 39 weeks ended October 29, 2022, compared to $5.9 billion for the 39 weeks ended October 30, 2021. The net sales increase was primarily due to the favorable impact from the continued resilience of the beauty category, retail price increases, the impact of new brands and product innovation, the easing of COVID-19 restrictions, and an increase of $59.6 million in other revenue compared to the 39 weeks ended October 30, 2021. The total comparable sales increase of 15.6% during the 39 weeks ended October 29, 2022 was driven by a 9.7% increase in transactions and a 5.4% increase in average ticket.
Gross profit
Gross profit increased $490.8 million or 21.0%, to $2.8 billion for the 39 weeks ended October 29, 2022, compared to $2.3 billion for the 39 weeks ended October 30, 2021. Gross profit as a percentage of net sales increased to 40.6% for the 39 weeks ended October 29, 2022, compared to 39.7% for the 39 weeks ended October 30, 2021. The increase in gross profit margin was primarily due to leverage of fixed costs, strong growth in other revenue, and favorable channel mix shifts, partially offset by lower merchandise margin and higher inventory shrink.
Selling, general and administrative expenses
SG&A expenses increased $221.0 million or 15.7%, to $1.6 billion for the 39 weeks ended October 29, 2022, compared to $1.4 billion for the 39 weeks ended October 30, 2021. SG&A expenses as a percentage of net sales decreased to 23.4% for the 39 weeks ended October 29, 2022, compared to 23.9% for the 39 weeks ended October 30, 2021, due to lower marketing expenses, partially offset by deleverage in corporate overhead primarily due to strategic investments.
Pre-opening expenses
Pre-opening expenses increased $0.6 million to $8.4 million for the 39 weeks ended October 29, 2022, compared to $7.8 million for the 39 weeks ended October 30, 2021.
Interest expense (income), net
Interest income, net was $0.6 million for the 39 weeks ended October 29, 2022 compared to interest expense, net of $1.2 million for the 39 weeks ended October 30, 2021. Interest income represents interest from cash equivalents and short-term investments with maturities of twelve months or less from the date of purchase. Interest expense represents interest on borrowings and fees related to the credit facility. We did not have any outstanding borrowings on our credit facility as of October 29, 2022, January 29, 2022, and October 30, 2021.
Income tax expense
Income tax expense of $289.9 million for the 39 weeks ended October 29, 2022 represents an effective tax rate of 24.3%, compared to $224.2 million of tax expense representing an effective tax rate of 24.4% for the 39 weeks ended October 30, 2021.
Net income
Net income increased $205.2 million or 29.5%, to $901.7 million for the 39 weeks ended October 29, 2022 compared to $696.5 million for the 39 weeks ended October 30, 2021. The increase in net income is primarily due to the $490.8 million increase in gross profit, partially offset by the $221.0 million increase in SG&A expenses and the $65.7 million increase in income taxes.
Liquidity and capital resources
Our primary sources of liquidity are cash and cash equivalents, cash flows from operations, and borrowings under our credit facility. The most significant components of our working capital are merchandise inventories and cash and cash