If the refund is for a tax deductible payment previously made you DO have to pay tax on the refund. You can post it against the tax liability you paid and then adjust the liability, which increases net income, thus increasing income tax.
If this is personal tax refund, it was neither deductible previously nor taxable today, but depositing it to the business account is owner equity contribution.
If your situation is different than one of the above please explain in moire detail