We received our small business/personal income tax return from our CPA this year and, while reviewing it prior to signing and mailing, discovered multiple errors. We then reviewed the previous year's return and discovered multiple errors there, too. The CPA agreed to correct the return (both this year's and last), which resulted in us owing much less and receiving a refund from the IRS and state for the previous year's return. Given that the errors cost us significant time and money, we requested that the current year's tax preparation fee be waived. Our CPA declined this request, so I'd like to find out what recourse we have. I would be happy to provide additional details if needed.