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Understanding Write-Offs. Write-offs reduce the amount of taxable income you have. For example, if you make $100,000 a year and have $10,000 in write-offs, you would be taxed on only $90,000 in income.In some cases, tax write-offs can lower your federal income tax bracket, reducing the percentage of your taxable income you must pay.or example, if you make $100,000 a year and have $10,000 in write-offs, you would be taxed on only $90,000 in income.