A guy walked into my office last month, handed me a shoebox full of receipts, and said he’d been running his landscaping business for three years. He figured he owed about $8,000 in taxes based on what he made. Two hours later, after going through his actual expenses and talking about how he runs his operation, we got that number down to $2,400. He’d been missing over $5,000 in legitimate deductions every single year. This…