 A recent undercover study found that over 89% of paid tax preparers made mistakes. You heard me right. Over 89%. Is your tax person making mistakes? Tax mistakes cost you money and may even lead to an IRS audit. I recommend you get a second opinion on your tax return today by calling Tothero Helen Welch CPAs at 848-1072. Tothero Helen Welch has been providing tax services to individuals and businesses for over 50 years.