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A general percentage of sales is not acceptable and if included in the accounts is disallowed on the inland revenue self assessment tax return
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But if you do not want to spend a lot of hours figuring out the US tax law and if you do not want to take a risk of getting smaller refund amount (because of not being sure what you are doing), then you can ask help from a company providing Tax Refund service
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There you will find full description of Tax Refund USA service, procedure, required documents and other
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