Why would a CPA firm review my last three years of tax returns?

A CPA firm reviews your prior returns for two reasons. First, to find mistakes that can still be corrected. Second, to understand your situation before planning anything new.

Prior returns reveal what was done wrong and what was never done at all. Missed deductions are common. Credits that weren’t claimed. Depreciation elections that weren’t made. Entity structure choices that no longer fit the business. Sometimes the return itself has outright errors, like income reported incorrectly or deductions calculated wrong.

Some of these findings are recoverable. If a deduction was missed, you can generally amend the return and claim a refund. The IRS allows amended individual returns going back three years from the original filing date, and business returns follow similar rules. Accounting method changes can sometimes be made retroactively with proper filings. These are real dollars that come back to you.

Our founder learned this firsthand. His own tax returns were once prepared wrong by someone else. Another person’s W-2 was entered on his return, and a credit was omitted entirely. Amending two years recovered about $4,000. That experience left a mark. The barrier to preparing paid returns is remarkably low, and most people have no way to judge the quality of the work they’re paying for.

Other findings aren’t recoverable but inform better planning going forward. An S corporation election that should have been made years ago can’t be undone, but recognizing it now means the structure can be fixed for future years. Retirement plan contributions that weren’t maximized are gone, but seeing the pattern helps size contributions properly going forward.

The look-back also establishes a baseline. Before recommending any planning strategy, we need to understand your income level, entity structure, existing elections, and what deductions you’re already taking. Without that context, tax and accounting services are guesswork.

Not every look-back uncovers recoverable money. Sometimes the prior returns were done correctly and the review simply confirms that. But when errors exist, finding them early means you can act while the amendment window is still open.

If you’ve never had anyone review your prior returns, or if you’re switching preparers and want to know what shape your tax history is in, we’re happy to take a look. Book a consultation and we’ll walk through what we find.