Most tax errors do not show up at filing time. Errors often surface months or even years later. The IRS may identify them when matching your return against third-party data. Reviewing prior-year tax returns can uncover these issues before they create larger problems. At Stout Tax Strategies, we regularly review prior-year returns for new clients. These reviews often reveal more significant errors than clients expect.
If you are looking for the best tax preparer in St. Clair Shores, MI to review your past returns and identify what may have gone wrong, this guide explains what that process looks like and why it matters.
What a Prior Year Tax Return Review Actually Involves
Reviewing a prior year return is not the same as preparing a new one. It is a structured look at what was filed, what the IRS received from third parties, and whether those two things are consistent. We look at income reporting, deduction claims, depreciation schedules, credit eligibility, and filing status.
We also look at what is missing. A prior preparer who skipped depreciation, missed a deductible expense, or failed to carry forward a suspended loss may have left money unclaimed that can still be recovered through an amended return.
The IRS generally allows amendments for up to three years from the original filing deadline. That window is narrower than most people realize, and it closes permanently once it passes.
Tax Return Review Catching Prior Year Errors: The Most Common Issues We Find
When we review prior returns, certain errors appear consistently. These are not unusual edge cases. They are mistakes that happen on a regular basis, especially on self-prepared returns and returns filed with high-volume preparers who did not take time to understand the full picture.
Common errors include:
Unreported or misreported 1099 income that triggered or will trigger a CP2000 notice
Depreciation not claimed on rental property or business assets
Passive activity losses not carried forward correctly from prior years
Michigan pension exemption applied to the wrong birth-year tier
Retirement contribution deductions missed or calculated incorrectly
Business expenses claimed as personal, or personal expenses claimed as business
Filing status errors, particularly in years involving separation or divorce
Any of these can result in either overpaid taxes that can be recovered or underpaid taxes that will eventually trigger IRS correspondence.
When a Prior Year Error Triggers an IRS Notice
The IRS does not always catch errors immediately. The CP2000 process, which matches third-party income reports against filed returns, typically runs six months to two years after a return is filed. That delay creates a false sense of security. A return filed cleanly in April may generate a notice the following spring or even the year after that.
When a CP2000 arrives, it proposes a change to the return and gives you 60 days to respond. If you agree, you pay the additional tax plus interest. If you disagree, you need documentation that supports your original position. Without a preparer who knows the history of your return, building that response is significantly harder.
Our IRS correspondence assistance covers the full response process. We review the notice, cross-reference it against the original return and supporting documents, and respond on your behalf. You do not have to contact the IRS or interpret the notice language yourself.
What Happens When Prior Year Errors Go Unaddressed
An unaddressed error does not disappear. If income was underreported in a prior year, the IRS will eventually identify it through matching. If a deduction was overclaimed without documentation, a future audit or notice review can flag it.
More seriously, a Notice of Deficiency, also called a CP3219A, is issued when the IRS intends to assess additional tax and prior correspondence was ignored or unresolved. You have 90 days to petition the U.S. Tax Court. Missing that deadline means the IRS assesses the tax automatically and begins collection.
Working with the best tax preparer in St. Clair Shores, MI to review prior returns before those notices arrive is a far less expensive process than resolving them after collection has started.
How Amended Returns Work and When to File One
If a prior year review uncovers an error that resulted in overpaid taxes, an amended return on Form 1040-X recovers the difference. If the error resulted in underpaid taxes, filing an amended return proactively before the IRS identifies the issue typically reduces penalties.
The IRS processes amended returns separately from original filings. Processing times vary but typically run several months. We prepare and file amended returns for clients whose prior year reviews identify material errors, and we coordinate the timing of those filings to minimize penalty exposure.
If you have multiple years that need correction, we sequence the amendments strategically. Fixing one year in isolation without reviewing adjacent years can create new inconsistencies that attract attention.
Our multi-year tax strategy guide covers how connected tax planning across years prevents these issues from accumulating in the first place.
IRS Tools and Taxpayer Rights During a Review
Taxpayers have the right to request transcripts of their filed returns and IRS records directly. The IRS Get Transcript tool at irs.gov allows you to view your account transcript, which shows what the IRS has on file, including any notices issued and payments received. Comparing your transcript to your filed return is often the first step in identifying whether a discrepancy exists.
For taxpayers who believe the IRS has assessed tax incorrectly based on a prior year error, the IRS Taxpayer Advocate Service provides independent assistance in cases where the standard process is causing financial hardship or has not been resolved through normal channels.
When we provide IRS correspondence assistance, we use these tools as part of our review process. We pull transcripts, compare them against filed returns, and identify whether the IRS position reflects an actual error or a documentation gap that can be addressed with a clear response.
Frequently Asked Questions
What does a tax return review catching prior year errors actually look for?
We look for unreported income, missed deductions, depreciation errors, incorrect filing status, and any discrepancy between what was filed and what the IRS received from third parties.
How far back can I amend a prior year tax return?
The IRS allows amendments for up to three years from the original filing deadline. After that window closes, errors resulting in overpaid taxes cannot be recovered through an amended return.
Can the best tax preparer in St. Clair Shores MI fix errors from a return another preparer filed?
Yes. Stout Tax Strategies reviews and amends returns prepared elsewhere. We identify the error, prepare the corrected return, and handle any IRS correspondence assistance needed to resolve the matter.
What should I do if I receive a CP2000 notice about a prior year return?
Do not ignore it. You have 60 days to respond. Bring the notice and your prior year return to us and we will review both, assess the IRS position, and manage the response on your behalf.
Will filing an amended return trigger an audit?
An amended return does not automatically trigger an audit. Filing proactively before the IRS identifies an error typically reduces penalty exposure and demonstrates good faith, which works in your favor.
What to Take Away
Prior year tax errors are more common than most people realize, and they rarely announce themselves at filing time. They surface through IRS notices months or years later, often after the window to recover overpaid taxes has narrowed.
A structured tax return review focused on catching prior year errors gives you the chance to fix problems before they escalate, recover deductions that were missed, and get ahead of any IRS correspondence before deadlines start running.
As the best tax preparer in St. Clair Shores, MI for prior year reviews, Stout Tax Strategies handles the full process from initial review through amended filing and IRS correspondence assistance if notices arrive. We serve clients across St. Clair Shores, Macomb County, and surrounding Michigan communities year-round.
If you want your prior year returns reviewed before the IRS gets there first, reach out to our team and we will start with a clear assessment of what we find.