You can use various self-employment tax deductions, but be careful not to include expenses you can't write off. Trying to write off a non-deductible expense can lead to audits and more tax penalties.nnHere are some examples of expenses you can' write off:nnFederal income taxes, whether from a 1099 or W2.nProperty taxes on personal use property.nSales taxes from customers or clients who purchase your goods and services.