As an accounting expert, one key tax deduction tip I always offer to new business owners is keeping meticulous records of startup costs. Many don't realize that expenses incurred before officially launching the business, like legal fees, marketing research, and even certain travel costs, can often be deducted. For instance, I once worked with a client who saved thousands in their first tax season by properly tracking and deducting pre-launch expenses. My advice is simple: stay organized from day one, and don't overlook those early-stage costs, as they can add up to significant savings when tax time comes around. It's an excellent way to start on the right financial foot!