See this IRS article:
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https://www.irs.gov/individuals/understanding-your-4883c-letter">https://www.irs.gov/individuals/und...>
You can phone the free TurboTax Audit Support Center during business hours, and they can help you with an IRS letter.
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https://support.turbotax.intuit.com/irs-notice/audit-support/">https://support.turbotax.intuit.com/i...>
