Are You Overpaying on Taxes? Take the Self-Assessment

Answer these 10 questions to find out if you are leaving money on the table -- and whether amending your prior-year returns could put thousands of dollars back in your pocket.

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How This Self-Assessment Works

Most business owners and real estate investors overpay on their taxes -- not because the tax code is unfair, but because common strategies are never implemented. The gap between what you owe and what you actually pay often comes down to whether your tax advisor is proactive or simply filing what you hand them.

This self-assessment is designed to surface the most common areas where we see clients leaving money on the table. For each question, check "No" if the strategy described was not applied to your situation. After completing all 10 questions, use the scoring guide below to determine whether a professional review of your prior returns is likely to uncover refund opportunities.

This is not a substitute for a professional tax review. It is a starting point to help you identify whether a deeper analysis is worth pursuing. Every situation is different, and the value of each strategy depends on your specific facts and circumstances.

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The 10-Question Tax Overpayment Assessment

1

Do you own rental property that has never had a cost segregation study?

Why this matters: A cost segregation study reclassifies building components into shorter depreciation lives (5, 7, and 15 years instead of 27.5 or 39 years). Without one, you are spreading your depreciation deductions over decades when you could be claiming a significant portion in year one. For a $500,000 property, the missed first-year deduction could be $40,000 to $80,000 or more. Properties purchased in prior years can still benefit through a Form 3115 lookback study that captures all previously missed depreciation on your current-year return.
2

Is your business structured as a sole proprietorship or single-member LLC (not taxed as an S-Corp)?

Why this matters: Sole proprietors and single-member LLCs pay self-employment tax (15.3%) on all net business income. By electing S-Corp status, you can pay yourself a reasonable salary and take the remaining profit as distributions -- which are not subject to self-employment tax. For a business netting $150,000, the S-Corp election can save $10,000 to $15,000 per year in self-employment taxes alone. The deadline for a current-year election is March 15, but late elections are sometimes available.
3

Did you maximize your retirement plan contributions last year?

Why this matters: Business owners have access to retirement plan structures that allow significantly higher contributions than a standard IRA. A Solo 401(k) allows up to $69,000 in combined contributions for 2026 ($76,500 if you are 50 or older). A defined benefit plan can shelter $200,000 or more per year, depending on your age and income. Every dollar contributed reduces your taxable income dollar-for-dollar. If you contributed nothing or only funded a basic IRA, you may have missed tens of thousands of dollars in deductions.
4

Do you operate a short-term rental without claiming material participation for tax purposes?

Why this matters: Short-term rentals with an average rental period of 7 days or less are not automatically classified as passive activities under IRC Section 469. If you materially participate in the management of your STR -- handling bookings, guest communication, maintenance, and cleaning -- the rental losses (including accelerated depreciation from a cost seg study) can offset your active business and professional income. This is the STR tax loophole that allows high-income earners to generate substantial paper losses against their other income. Without claiming material participation, those losses are trapped as passive and can only offset passive income.
5

Do you take a home office deduction?

Why this matters: If you regularly use a dedicated space in your home exclusively for business, you are entitled to deduct a portion of your mortgage interest or rent, utilities, insurance, repairs, and depreciation. The actual expense method often produces a larger deduction than the simplified method ($5 per square foot, up to 300 square feet). Many business owners skip this deduction because they have heard it triggers audits -- but when properly documented with a dedicated space used exclusively and regularly for business, it is a legitimate and well-supported deduction.
6

Are you using the most tax-efficient entity structure for your current income level?

Why this matters: The optimal entity structure changes as your income grows. A business earning $80,000 may be fine as a sole proprietorship, but at $200,000 an S-Corp saves significantly on self-employment taxes. At $500,000 or more, a C-Corp strategy with income splitting may reduce the overall effective rate further. If your entity structure has not been reviewed since your business started -- or since your income last changed substantially -- you may be operating in the wrong structure and overpaying as a result. An entity structure review is one of the highest-impact strategies we implement for new clients.
7

Did you purchase equipment or vehicles for your business without claiming Section 179 or bonus depreciation?

Why this matters: Section 179 and bonus depreciation allow you to deduct the full cost of qualifying business equipment, vehicles, and improvements in the year they are placed in service, rather than depreciating them over 5 to 7 years. Vehicles over 6,000 pounds GVWR (such as SUVs and trucks commonly used by business owners) can qualify for up to $28,900 in first-year depreciation under the luxury auto limits, or the full purchase price under Section 179 if the vehicle qualifies. Missing these deductions in the year of purchase means spreading the tax benefit over many years instead of capturing it immediately.
8

Have you reviewed whether your rental properties qualify for real estate professional status (REPS)?

Why this matters: If you or your spouse spend more than 750 hours per year in real property trades or businesses, and that time exceeds the hours spent in all other trades or businesses, you may qualify as a real estate professional. REPS status converts rental losses from passive to non-passive, allowing them to offset your active income without limitation. For investors with large depreciation deductions from cost segregation studies, REPS status can unlock tens or hundreds of thousands of dollars in deductions that would otherwise be suspended. Many qualifying taxpayers never claim this status because their CPA did not ask about their hours.
9

Did you claim all eligible business deductions -- including travel, meals, continuing education, and professional services?

Why this matters: Business owners are entitled to deduct ordinary and necessary expenses related to their trade or business. Common overlooked deductions include business travel (flights, lodging, car rentals), business meals (50% deductible for business discussions), professional development and continuing education, professional services (legal, accounting, consulting), subscriptions and software, and health insurance premiums (100% deductible for self-employed individuals). The cumulative impact of missing several small deductions can be $5,000 to $15,000 or more per year in lost deductions.
10

Has your tax advisor discussed proactive tax strategies with you -- or do they only file your return after year-end?

Why this matters: The single biggest predictor of whether you are overpaying taxes is whether your advisor is reactive or proactive. A reactive approach means your CPA receives your documents in February or March, files an accurate return, and moves on. A proactive approach means your advisor is reviewing your situation quarterly, recommending entity changes before deadlines pass, projecting estimated payments, identifying cost segregation opportunities, and adjusting strategies based on real-time income changes. If your tax advisor does not contact you until tax season, you are almost certainly leaving money on the table.

How to Interpret Your Results

0 -- 2 "Problem" answers: You are likely in good shape. Your current tax strategy appears to be covering the major bases. There may still be niche opportunities worth exploring, but the high-impact items are addressed. A periodic review is still worthwhile to confirm nothing has changed.
3 -- 5 "Problem" answers: You are probably overpaying. Several meaningful strategies are not being applied to your situation. The combined impact could be $10,000 to $50,000 or more per year in excess taxes. A professional review of your current-year strategy and your three most recent prior-year returns is strongly recommended. Amended returns for prior years may generate refunds.
6 -- 10 "Problem" answers: You are almost certainly overpaying significantly. Multiple foundational strategies -- entity structure, depreciation acceleration, retirement contributions, and proactive planning -- are missing from your tax approach. The potential savings are likely substantial, often exceeding $50,000 per year for business owners and real estate investors with meaningful income. A comprehensive review should be a top priority.

What Happens Next?

If this assessment revealed gaps in your tax strategy, the next step is straightforward. A professional review of your prior three years of tax returns, combined with a forward-looking strategy session, will quantify exactly how much you have been overpaying and what can be recovered.

At AE Tax Advisors, our discovery call process starts with exactly this kind of analysis. We review your returns, identify missed deductions and strategies, and provide a clear estimate of potential savings -- both going forward and through prior-year amendments -- before you commit to anything.

The IRS allows you to amend returns for the most recent three years in most cases. That window is always closing. A return that could be amended today may age out in a few months if action is not taken.

Ready for a Professional Review?

If you answered "yes" to three or more of the questions above, your prior returns likely contain recoverable overpayments. Our team reviews returns for business owners and real estate investors nationwide, identifying missed cost segregation studies, entity structure savings, retirement plan opportunities, and other strategies that can be claimed through amended filings.

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Frequently Asked Questions

How do I know if I overpaid taxes in prior years?

Common signs that you overpaid include: you own rental property but never had a cost segregation study, you operate a business as a sole proprietor or single-member LLC instead of an S-Corp, you did not maximize retirement plan contributions, you missed deductions for a home office or vehicle use, or your prior CPA did not discuss proactive tax strategies. If any of these apply, a review of your prior returns may reveal refund opportunities through amended filings.

How far back can I amend my tax returns?

Generally, you can file an amended return (Form 1040-X) within three years from the date you filed the original return or within two years from the date you paid the tax, whichever is later. For most taxpayers, this means the three most recent tax years are eligible for amendment. Some specific situations, such as net operating loss carrybacks, may allow you to reach further back.

What is the most commonly missed deduction for business owners?

The most commonly missed opportunities are entity structure optimization (operating as a sole proprietor instead of an S-Corp, resulting in excess self-employment tax), underutilized retirement plan contributions, missed cost segregation studies on owned property, and failure to properly document and deduct home office expenses, vehicle use, and travel.

Can I amend my return if my CPA already filed it?

Yes. You have the right to amend any tax return you have filed, regardless of who prepared it. An amended return (Form 1040-X for individuals, Form 1120-X or 1120S with amended box checked for corporations) supersedes the original filing. You do not need your original CPA's permission or involvement to file an amendment.

Will amending my tax return trigger an audit?

Filing an amended return does not automatically trigger an audit. The IRS reviews amended returns for accuracy just as it reviews original returns. Amendments that are well-documented and supported by proper records -- such as a cost segregation study, entity election paperwork, or retirement contribution receipts -- are processed routinely.

How much can I save by amending prior-year returns?

The amount varies widely depending on your income level, the strategies that were missed, and the number of years eligible for amendment. Our clients typically recover between $5,000 and $50,000 per amended year. Business owners who were operating in the wrong entity structure or real estate investors who missed cost segregation studies tend to see the largest recoveries.

Are You Leaving Tax Savings on the Table?

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