the prior incurred loss methodology. The provision for credit losses on loans reflects the increase in total loans receivable and increased reserves on individually evaluated nonaccrual commercial business loans.
During the three months ended September 30, 2022, net loan charge-offs totaled $563,000, compared to $309,000 during the three months ended September 30, 2021. The increase in net charge-offs was primarily due to a net charge-off increase of $373,000 in other consumer loans (which includes deposit overdraft net charge-offs of $396,000), partially offset by a reduction in charge-offs of $99,000 in indirect home improvement loans and $19,000 in marine loans. A further decline in national and local economic conditions, as a result the effects of inflation, a potential recession or slowed economic growth, and any governmental or societal response to the COVID-19 pandemic, among other economic factors, could result in a material increase in the ACLL and may adversely affect the Company’s financial condition and result of operations.
Noninterest Income. Noninterest income decreased $4.2 million, to $4.2 million for the three months ended September 30, 2022, from $8.4 million for the three months ended September 30, 2021. The decrease during the quarter primarily reflects a $5.5 million, or 79.6% decrease in gain on sale of loans due primarily to a reduction in origination and sales volume of loans held for sale and a reduction in the gross margin of sold loans, partially offset by an $825,000 increase in other noninterest income, primarily from BOLI death benefits and $438,000 in service charges and fee income as a result of less amortization of MSR reflecting increased market interest rates and increased servicing fees from non-portfolio serviced loans. Gross margin on home loan sales decreased to 2.31% for the three months ended September 30, 2022, from 3.61% for the three months ended September 30, 2021.
Noninterest Expense. Noninterest expense decreased $678,000 to $19.3 million for the three months ended September 30, 2022, from $20.0 million for the three months ended September 30, 2021. The decrease in noninterest expense reflects a reduction in salaries and benefits of $1.4 million, primarily due to a reduction in incentive compensation.
The efficiency ratio, which is noninterest expense as a percentage of net interest income and noninterest income, improved to 60.99% for the three months ended September 30, 2022, compared to 64.46% for the three months ended September 30, 2021, primarily representing the increase in net interest income.
Provision for Income Tax. For the three months ended September 30, 2022, the Company recorded a provision for income tax expense of $2.2 million as compared to $2.7 million for the three months ended September 30, 2021. The decrease in the tax provision is primarily due to a $385,000 decrease in pre-tax income during the three months ended September 30, 2022, as compared to the same quarter last year. The effective corporate income tax rates for the three months ended September 30, 2022 and 2021 were 20.6% and 24.5%, respectively. The decrease in the effective corporate income tax rate was attributable to increases in non-taxable income from exempt municipal securities interest and the BOLI death benefits.
Comparison of Results of Operations for the Nine Months Ended September 30, 2022 and 2021
General. Net income was $22.0 million for the nine months ended September 30, 2022, and $28.8 million for the nine months ended September 30, 2021. The decrease in net income for the nine months ended September 30, 2022 was primarily impacted by a $15.2 million, or 51.3% decrease in noninterest income, a $3.1 million increase in the provision for credit losses, and a $2.1 million increase in noninterest expense, partially offset by an $11.0 million increase in net interest income and a $2.7 million decrease in provision for income tax expense.
Average Balances, Interest and Average Yields/Cost
The following table sets forth for the periods indicated, information regarding average balances of assets and liabilities, as well as the total dollar amounts of interest income from average interest-earning assets and interest expense on average interest-bearing liabilities, resultant yields, interest rate spread, net interest margin (otherwise known as net yield on interest-earning assets), and the ratio of average interest-earning assets to average interest-bearing liabilities. Also presented is the weighted average yield on interest-earning assets, rates paid on interest-bearing liabilities and the resultant spread at for the periods presented. Income and all average balances are monthly average balances. Nonaccruing loans