Commission Income: Commission income includes revenues from new and renewal commissions paid by insurance carriers, which we recognize when earned. Commission income for the three months ended March 31, 2023 was $1,483.
Finance and Other Service Income. Finance and other service income includes revenues from premium installment charges, which we recognize when earned, and other miscellaneous income and fees. Finance and other service income for the three months ended March 31, 2023 increased by $823, or 24.8%, to $4,140 from $3,317 for the comparable 2022 period. The increase is primarily driven by the increase in written premium and changes to our fee assessment policies.
Losses and Loss Adjustment Expenses. Loss and loss adjustment expenses incurred for the three months ended March 31, 2023 increased by $43,987, or 35.7%, to $167,153 from $123,166 for the comparable 2022 period. The increase in losses is due to the February Winter Freeze, as well as current market conditions including inflation.
Our GAAP loss ratio for the three months ended March 31, 2023 increased to 87.2% from 65.8% for the comparable 2022 period. Our GAAP loss ratio excluding loss adjustment expenses for the three months ended March 31, 2023 was 76.2% compared to 55.2% for the comparable 2022 period. Total prior year favorable development included in the pre-tax results for the three months ended March 31, 2023 was $11,533 compared to $12,412 for the comparable 2022 period.
Underwriting, Operating and Related Expenses. Underwriting, operating and related expenses for the three months ended March 31, 2023 decreased by $1,561, or 2.5%, to $60,033 from $61,594 for the comparable 2022 period. Our GAAP expense ratio for the three months ended March 31, 2023 decreased to 31.3% from 32.9% for the comparable 2022 period. The decrease is driven by a decrease in contingent commission expenses.
Interest Expense. Interest expense was $210 and $129 for the three months ended March 31, 2023 and 2022, respectively. The credit facility commitment fee included in interest expense was $19 for the three months ended March 31, 2023 and 2022.
Income Tax Expense. Our effective tax rate was 19.4% and 22.5% for the quarters ended March 31, 2023 and 2022, respectively. The effective tax rate for the quarter ended March 31, 2023 was lower than the statutory rate primarily due to the effects of the change in unrealized gains on equity securities. The effective tax rate for the quarter ended March 31, 2022 was higher than the statutory rate primarily due to the effects of the change in unrealized gains on equity securities and the impact of stock-based compensation.
Net (Loss) Income. Net loss for the three months ended March 31, 2023 was $12,337 compared to net income of $7,838 for the comparable 2022 period.
Non-GAAP Operating Income. Non-GAAP operating loss as defined above was $12,796 for the three months ended March 31, 2023 compared to non-GAAP operating income of $14,809 for the comparable 2022 period. The decrease in Non-GAAP operating income was primarily the result of an increase in loss and loss adjustment expenses compared to the prior period.
Liquidity and Capital Resources
As a holding company, Safety’s assets consist primarily of the stock of our direct and indirect subsidiaries. Our principal source of funds to meet our obligations and pay dividends to shareholders, therefore, is dividends and other permitted payments from our subsidiaries, principally Safety Insurance. Safety is the borrower under our credit facility.
Safety Insurance’s sources of funds primarily include premiums received, investment income, and proceeds from sales and redemptions of investments. Safety Insurance’s principal uses of cash are the payment of claims, operating expenses and taxes, the purchase of investments, and the payment of dividends to Safety.