Tax-deductible expenses are costs that can be subtracted from your total taxable income

https://writeablog.net/hithinctsm/bonding-basics-what-you-need-to-know-as-a-business-owner

Tax-deductible expenses are costs that can be subtracted from your total taxable income, potentially lowering your tax bill. Common examples include charitable donations, certain medical expenses, and business-related costs