You can deduct the costs of running your business. These costs are known as business expenses. These are costs you do not have to capitalize or include in the cost of goods sold.

To be deductible, a business expense must be both ordinary and necessary. An ordinary expense is one that is common and accepted in your field of business. A necessary expense is one that is helpful and appropriate for your business. An expense does not have to be indispensable to be considered necessary.

For more information about the general rules for deducting business expenses, see chapter 1 in Publication 535, Business Expenses.

If you have an expense that is partly for business and partly personal, separate the personal part from the business part.

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