Should You Hire a Professional to Do Your Taxes?

If you only have a single W-2 and take the standard deduction, your taxes are probably easy enough to do yourself (or with the help of tax software). But what are the signs that you should hire a tax preparer to prepare and file your taxes with the IRS and state? What are the benefits of doing so, even if you have a simple tax return? What can a tax professional do that professional tax software can’t? Requirements: Finance and tax professionals (CPAs, financial planners, etc.) only please.