Selling costs generally correlate to revenue. In the short-term as a percentage of sales, we expect selling costs to remain relatively flat. However, as positive regulatory developments in our core markets occur, we expect selling costs as a percentage of sales to decrease via growth in our retail and wholesale channels.
General and administrative expenses also include costs incurred at the corporate offices, primarily related to personnel costs, including salaries, benefits, and other professional service costs, as well as corporate insurance, legal and professional fees associated with being a publicly traded company. We expect general and administrative expenses as a percentage of sales to decrease as we realize revenue growth organically and through positive regulatory developments in our core markets.
Total expenses for the three months ended March 31, 2023, were $9,151,706 a decrease of $1,097,132 compared to total expenses of $10,248,838 for the three months ended March 31, 2022. The decrease in total expenses is primarily attributable to a decrease in salaries and wages and professional fees partially offset by an increase in share-based compensation expense.
Operating Income (Loss) before Income Taxes
Operating income (loss) before other income (expense) and provision for income taxes for the three months ended March 31, 2023, was $368,506 an increase of $8,128,666 compared to an operating loss of ($7,760,160) for the three months ended March 31, 2022.
Total Other Income (Expense)
Total other expense for the three months ended March 31, 2023, was $(7,112,476), a change of $1,434,146 compared to other expense of $(8,546,622) for the three months ended March 31, 2022. This change is primarily attributable to a decrease in impairment charges of $5,313,176 partially offset by an increase in interest expense of $2,532,990 driven by the Credit Facility.
Provision for Income Taxes
Income tax expense is recognized based on the expected tax payable on the taxable income for the year, using tax rates enacted or substantively enacted at year-end. For the three months ended March 31, 2023, tax expense totaled $1,662,000 compared to tax recoveries of $1,740,000 for the three months ended March 31, 2022. The increase in tax expense is primarily attributable to increased gross profit, decreased inventory valuation adjustments, and decreased asset impairments.
Year ended December 31, 2022, Compared to the Year Ended December 31, 2021
Revenue
We derived our revenue from cultivating, processing, and distributing cannabis products through our nineteen dispensaries in five states and our wholesale sales to third parties in four states. For the year ended December 31, 2022, 83% of the revenue was generated from retail dispensaries and 17% from wholesale business. For the year ended December 31, 2021, 82% of the revenue was generated from retail business and 18% from wholesale business.
For the year ended December 31, 2022, Minnesota operations contributed approximately 51% of revenues, New York contributed 20%, Arizona contributed 3%, New Mexico contributed 8%, and Maryland contributed 18%. For the year ended December 31, 2021, Minnesota operations contributed approximately 40% of revenues, New York contributed 25%, Arizona contributed 16%, New Mexico contributed 6%, and Maryland contributed 13%.
Revenue for the year ended December 31, 2022, was $74,625,867, an increase of $20,179,699 or 37% compared to revenue of $54,446,168 for year ended December 31, 2021. The increase is primarily attributable to revenue contributions from the retail business in Minnesota of $15.7 million, the retail business in Maryland of $4.7 million, and the retail business in New Mexico of $2.9 million, partially offset by the lack of revenues from the Arizona retail business, which was divested in 2021. Key revenue drivers are the increased patient demand in Minnesota driven by the addition of cannabis flower to the Minnesota medical program in March of 2022, the commencement of recreational marijuana sales in New Mexico on April 1, 2022, and the acquisition of Charm City Medicus, LLC, in the fourth quarter of 2021.