SNAP Benefits Fairness Act of 2023 This bill repeals the shelter deduction cap for the Supplemental Nutrition Assistance Program (SNAP) benefit, thereby allowing a household to deduct all allowable housing expenses (e.g., rent or mortgage, electricity, and water costs) that exceed 50% of a household's income after other deductions when calculating net income to determine SNAP benefits. Under current law, the shelter deduction is capped (unless at least one household member is an elderly or disabled individual), and the cap is adjusted annually for inflation. In FY2023, the shelter deduction was capped at $624 for households in the contiguous 48 states and the District of Columbia.