Expense (1) The economic costs a business incurs by its operations to earn revenue that are usually tax-deductible (i.e., they reduce taxable income). Home Resources Startup Law Dictionary Expense Return to Glossary Need legal help? Schedule a free consultation with a world-class startup attorney on LawTrades. LET'S CHAT Roy G. Business Attorney Heather N. Business Attorney Jared S. Business Attorney Tell us about your project We'll connect you with a vetted attorney in just a few minutes. Trusted by top companies like :