general and administrative expenses increased $7.8 million and $25.2 million for the three and six months ended March 31, 2023, respectively, due to the addition of B Medical and higher labor costs.
Life Sciences Services segment selling, general and administrative expenses increased $3.0 million and $10.3 million for the three and six months ended March 31, 2023, respectively, as compared to the corresponding prior fiscal year period, which increases were related to investments in the commercial organization and laboratory support personnel.
Unallocated corporate expenses decreased $6.0 million and increased $1.1 million for the three and six months ended March 31, 2023, respectively, as compared to the corresponding prior fiscal year period. The three months ended March 31, 2022 included costs related to the semiconductor automation disposition, which did not repeat in the corresponding 2023 period. Unallocated costs increased in the six months ended March 31, 2023 as compared to the corresponding period of the prior fiscal year due to costs and costs related to the accelerated share repurchase agreement we entered into in November 2022.
Restructuring Charges
Restructuring charges increased by $1.4 million and $2.7 million for the three and six months ended March 31, 2023, respectively, as compared to the three and six months ended March 31, 2022. The three and six months ended March 31, 2023 includes restructuring charges related to the separation of personnel. Costs savings from these actions are expected to be realized by the end of June 30, 2023.
Non-Operating Income (Expenses)
Interest income – We recorded interest income of $10.3 million and $21.0 million for the three and six months ended March 31 2023, respectively, as compared to $3.1 million recorded in both the corresponding periods of the prior fiscal year. This increase in interest income is due to interest earned on the proceeds from the sale of the semiconductor automation business, including interest accrued on a net investment hedge, during the three and six month period ended March 31, 2023. Please refer to the Derivative Financial Instruments section of Note 2, “Summary of Significant Accounting Policies” in the Notes to the unaudited consolidated financial statements included in Item 1 “Consolidated Financial Statements” of this Quarterly Report on Form 10-Q.
Interest expense – During the three and six months ended March 31, 2023 we recorded interest expense of $0.0 million and $0.0 million, respectively, as compared to $1.5 million and $2.0 million, respectively, during the corresponding period of the prior fiscal year. The decrease in interest expense for the three and six months ended March 31, 2023, is attributed to our previously outstanding term loan that was settled on February 1, 2022 using the proceeds from the sale of the semiconductor automation business. We incurred a loss on extinguishment of debt of $0.6 million during the three and six months ended March 31, 2022.
Other income (expenses) – We recorded other expense of $2.7 million and $1.5 million for the three and six months ended March 31, 2023, respectively, as compared to other expense of $1.2 million and $2.2 million, respectively, for the three and six months ended March 31, 2022, primarily due to lower foreign exchange losses during the period.
Income Tax Provision / Benefit
We recorded an income tax benefit of $3.3 million and $7.9 million, respectively during the three and six months ended March 31, 2023. The tax benefit for the three months ended March 31, 2023 was primarily driven by the pre-tax loss from operations during the period. The tax benefit for the six months ended March 31, 2023 was primarily driven by the pre-tax loss from operations and a $1.4 million deferred tax benefit resulting from the extension of a tax incentive in China. The effective tax rates for the three and six months ended March 31, 2023 are substantially higher than statutory rates. The effective rates are driven higher than the statutory rates by the discrete tax benefit in China noted above and the fair value adjustment of the contingent consideration related to the B Medical acquisition. The contingent consideration generated $17.1 million of pre-tax income that is not subject to income taxes, therefore, the tax benefit is being driven by a tax loss that is significantly higher than the book loss for these periods. The effective