Manufacturing margin percentages were 10.9% for the first quarter of 2020, as compared to 13.6% of net sales for the same prior year period, a decline of 270 basis points. The decline was mostly attributable to lower sales volumes resulting in less overhead absorption, partially offset by strong labor productivity driven by efficiency gains through our investments in new technology and automation. When compared to the fourth quarter of 2019, manufacturing margin percentage increased by 700 basis points due to relatively improved sales demand coupled with effective cost reduction actions.
Depreciation expenses were $5.6 million for the first quarter of 2020, as compared to $5.0 million for the same prior year period. The increase was driven by our investments in new technology and automation made in 2019. Amortization expenses were $2.7 million for the first quarter of 2020, equivalent to the same prior year period.
Profit sharing, bonuses, and deferred compensation expenses were $1.3 million for the first quarter of 2020, as compared to $1.8 million for the same prior year period. The decrease was primarily driven by lower bonus accruals and modest declines in deferred compensation liabilities.
Other selling, general and administrative expenses were $5.6 million for the first quarter of 2020, as compared to $6.7 million for the same prior year period, which included $1.8 million ofone-time IPO and Defiance Metal Products (DMP) acquisition related expenses. Excluding theseone-time expenses, other selling, general and administrative expenses increased $0.7 million primarily due to costs associated with being a publicly traded company, slightly offset by the aforementioned cost saving initiatives, plus synergies achieved through the integration of DMP.
Interest expense was $0.8 million for the first quarter of 2020, as compared to $2.8 million for the same prior year period. The decrease is due to less debt during the first quarter 2020 as compared to 2019, and lower interest rates attributable to the more favorable terms in the Amended and Restated Credit Agreement from September 2019.
Income tax expense was $0.7 million for the first quarter of 2020 as compared to $0.8 million for the same prior year period. Federal income tax expenses will be offset against our federal net operating loss carryforward of approximately $13.8 million until it is fully utilized.
EBITDA and EBITDA Margin percent were $9.8 million and 9.1%, respectively, for the first quarter of 2020 as compared to $13.7 million and 9.5%, respectively, for the first quarter of 2019. Adjusted EBITDA and Adjusted EBITDA Margin percentage were $11.4 million and 10.5%, respectively, for the first quarter of 2020, as compared to $16.8 million and 11.7%, respectively, for the same quarter in 2019. The decrease in EBITDA and adjusted EBITDA was primarily driven by the declines in net sales due to the aforementioned declines in market demand. When compared to the fourth quarter of 2019, Adjusted EBITDA margin percentage increased by 570 basis points. The increase is attributable to improved sales demand, coupled with effective cost reduction actions.