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Business expenses are the cost of carrying on a trade or business. These expenses are usually deductible if the business operates to make a profit.
Just having a seller account would not constitute a business ...The business is considered as started if you have a product or service for sale.
To be deductible, a business expense must be both ordinary and necessary. An ordinary expense is one that is common and accepted in your trade or business. A necessary expense is one that is helpful and appropriate for your trade or business. An expense does not have to be indispensable to be considered necessary.