Selling and Administrative Expenses
Selling and administrative expenses increased $18.3 million, or 8.1%, to $243.5 million for the first quarter of 2021, compared to $225.2 million for the first quarter of 2020. The increase was primarily due to higher salaries in the first quarter of 2021, combined with higher expenses related to our incentive compensation plans. In the first quarter of 2020, in response to our retail stores being shut down at the onset of the pandemic we took steps to reduce expense, including workforce reductions, furloughs for a significant portion of our retail store associates and temporary salary reductions for most remaining employees. Logistics and other variable expenses were also higher in the first quarter of 2021 to support higher sales volume. As a percentage of net sales, selling and administrative expenses decreased to 38.1% for the first quarter of 2021, from 56.7% for the first quarter of 2020.
Impairment of Goodwill and Intangible Assets
During the first quarter of 2020, we incurred impairment charges of $262.7 million ($218.5 million on an after-tax basis), including $240.3 million associated with goodwill and $22.4 million associated with the indefinite-lived Allen Edmonds and Via Spiga trade names. There were no corresponding charges for the first quarter of 2021. Refer to Note 5 and Note 8 to the condensed consolidated financial statements for further discussion of these charges.
Restructuring and Other Special Charges, Net
We incurred restructuring and other special charges of $13.5 million ($11.9 million on an after-tax basis, or $0.31 per diluted share), reflecting expenses associated with the decision to close all Naturalizer retail stores in North America with the exception of two Naturalizer flagship retail stores in the United States. Restructuring and other special charges of $60.2 million ($47.7 million on an after-tax basis, or $1.24 per diluted share) were incurred in the first quarter of 2020 related to the unfavorable business climate, driven by the impact of the COVID-19 pandemic on our business operations. These charges were primarily for impairment associated with retail store furniture and fixtures and lease right-of-use assets and liabilities associated with factory order cancellations. Refer to Note 5 to the condensed consolidated financial statements for further discussion of these charges.
Operating Earnings (Loss)
Operating earnings increased $444.1 million to $17.9 million for the first quarter of 2021, compared to an operating loss of $426.2 million for the first quarter of 2020, primarily reflecting higher net sales, gross profit and lower restructuring and impairment charges. As a percentage of net sales, operating earnings were 2.8% for the first quarter of 2021, compared to an operating loss of 107.3% for the first quarter of 2020.
Interest Expense, Net
Interest expense, net increased $2.3 million, or 24.4%, to $11.8 million for the first quarter of 2021, compared to $9.5 million for the first quarter of 2020, reflecting the fair value adjustment to the Blowfish Malibu mandatory purchase obligation of $6.4 million in the first quarter of 2021, compared to $3.2 million in the first quarter of 2020. The increase associated with the mandatory purchase obligation was partially offset by lower average borrowings under our revolving credit agreement. We continued to make debt reduction a priority during the first quarter of 2021, repaying $50.0 million during the first quarter of 2021 and ending the quarter with $200.0 million of borrowings under our revolving credit facility.
Other Income, Net
Other income, net increased $0.2 million, or 6.8%, to $3.8 million for the first quarter of 2021, compared to $3.6 million for the first quarter of 2020. Refer to Note 13 of the condensed consolidated financial statements for further detail regarding the components of net periodic benefit income.
Income Tax Benefit (Provision)
Our effective tax rate can vary considerably from period to period, depending on a number of factors. Our consolidated effective tax rate was 35.5% for the first quarter of 2021, compared to 19.9% for the first quarter of 2020. Our higher tax rate for the thirteen weeks ended May 1, 2021 primarily reflects the non-deductibility of losses at our Canadian division, which were driven by exit-related costs associated with Naturalizer retail stores. The rate was partially offset by discrete tax benefits totaling $1.2 million. During the first quarter of 2020, our effective tax rate was impacted by several discrete tax items, including the non-deductibility of a portion of the Company's intangible asset impairment charges, the provision of a valuation allowance related to net deferred tax assets of its Canadian business division and the incremental tax provision related to share-based compensation.
Net Earnings (Loss) Attributable to Caleres, Inc.
Net earnings attributable to Caleres, Inc. were $6.2 million for the first quarter of 2021, compared to a net loss of $345.8 million for the first quarter of 2020, respectively, as a result of the factors described above.