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15 Common Mistakes Made on Tax Returns That Could Cause a Penalty

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Tax season brings a mix of dread and maybe a glimmer of hope for a refund. But what if, hidden amongst those forms and figures, lies a simple mistake that could turn your tax dreams into a nightmare? The IRS isn’t known for its leniency – slip-ups can result in penalties, headaches, and delayed refunds.

Don’t think it can happen to you? Even seasoned tax filers make mistakes. From silly typos to misinterpreting complex tax rules, there are numerous ways to trip up when preparing your return. The good news is awareness is half the battle!

Let’s delve into 15 common tax return pitfalls and how to avoid them, ensuring a smooth and stress-free filing experience. Think of it as your tax survival guide!

1. Math Mishaps

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While tax software has reduced errors, it’s not foolproof. A 2020 study by the Government Accountability Office (GAO) found inconsistencies in how commercial tax preparation software calculated certain deductions and credits, potentially leading to tax miscalculations. Double-check your numbers, especially if your return involves complex calculations.

If your return is simple, a quick review or a second calculator run-through could catch potential errors. For more complex situations, consider hiring a tax professional to review your calculations or prepare the return altogether.

2. Incorrect Filing Status

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Your filing status isn’t just about whether you’re single or married. National Taxpayer Advocate reports that a substantial number of taxpayer errors stem from confusion about the correct filing status. The IRS Interactive Tax Assistant can provide guidance based on your specific circumstances.

Carefully review the different filing statuses and their definitions on the IRS website. If still unsure, consult a tax advisor for clarification before filing your return. Choosing the correct status could significantly impact your tax bill!

3. Missing or Incorrect Social Security Numbers

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SSNs are essential for tax identification. Mismatches can prevent dependents from being linked to your return, leading to missed benefits like tax credits. Plus, an incorrect SSN could even connect your return to someone else’s, creating a bureaucratic nightmare you want to avoid.

Carefully compare your Social Security card against the numbers you entered on your tax return. Do the same for your spouse and dependents. If you find errors, contact the Social Security Administration to correct your records before filing your return.

4. Forgetting to Sign and Date

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This seemingly minor oversight can have big consequences. An unsigned return may be treated as if you hadn’t filed at all, triggering the potential accrual of late-filing penalties that can reach up to 25% of unpaid taxes, according to the IRS.

Treat the signature like the finishing touch. Before submitting your return, double-check that you and your spouse (if filing jointly) have both signed and dated it. If e-filing, ensure that you’ve completed all the steps, including the final digital signature.

5. Unreported Income

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The IRS receives copies of all your W-2s and 1099s, creating a record of your taxable income. Discrepancies raise red flags. Even small amounts of unreported income could result in reassessment of your taxes, plus interest and penalties. The IRS’ estimates put the “tax gap” (the difference between taxes owed and taxes paid) at more than $600 billion annually.

Meticulously gather all income documentation (W-2s, 1099s, bank interest statements, etc.). Compare what’s on these documents to what you report on your tax return. If you realize you’ve missed something, consider filing an amended tax return before the IRS catches the discrepancy.

6. Claiming Ineligible Deductions

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Tax laws evolve constantly, and yesterday’s eligible deductions might not be allowed today. Additionally, there are often strict record-keeping requirements for deductions. Misunderstanding the eligibility rules could land you in hot water with the IRS.

Before claiming a deduction, research the latest eligibility rules and documentation requirements. Consult IRS publications or seek guidance from a tax professional to avoid costly mistakes.

7. Overlooked Credits

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Tax credits are extra valuable because they reduce your tax owed dollar-for-dollar. Millions of eligible taxpayers miss out on credits like the EITC (earned income tax credit) each year, primarily due to a lack of awareness, according to a 2023 study by the Center on Budget and Policy Priorities. Exploring your credit options could lead to a welcome refund boost!

Use the IRS Interactive Tax Assistant to identify credits you might qualify for. Pay close attention to credits like the Earned Income Tax Credit, Child and Dependent Care Credit, and American Opportunity Tax Credit, even if you haven’t qualified in the past. Changes in your situation could make you eligible!

8. Mixing up Standard vs. Itemized Deductions

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Taxpayers can choose between the standard deduction (a fixed amount based on filing status) and itemizing deductions (claiming specific qualifying expenses). The standard deduction has significantly increased in recent years, making it the optimal choice for many. Incorrectly itemizing when the standard deduction is more beneficial could cost you money.

If your potential itemized deductions seem close to the standard deduction amount, use a tax calculator or tax preparation software to compare the results of both options. For most taxpayers, the increased standard deduction makes itemizing unnecessary.

9. Failing to Report Foreign Bank Accounts

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If you have foreign bank accounts exceeding an aggregate value of $10,000 at any point during the year, you must report them on your tax return (specifically with Schedule B) and file a separate FBAR form. Failure to do so carries hefty financial penalties.

If you maintain foreign bank accounts, familiarize yourself with the reporting requirements on the IRS website. Consult a tax advisor specializing in international tax matters if you have complex foreign financial holdings.

10. Missing the Tax Filing Deadline

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Tax deadlines are non-negotiable. If you miss that deadline, you could face late filing and payment penalties, which can quickly add up. Typically, the deadline is April 15th, but it can shift if that date falls on a holiday or weekend.

Don’t procrastinate! Mark the tax filing deadline on your calendar and start gathering your documents early. If you can’t finish by the deadline, file an extension (Form 4868) to avoid late-filing penalties. Keep in mind, an extension gives you more time to file, not more time to pay any taxes owed.

11. Incorrect Bank Account Information for Direct Deposit

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Opting for direct deposit is a fast, secure way to get your refund. But one wrong digit in your bank account number could send your money to an unintended destination or cause the IRS to issue a paper check instead, delaying your refund.

When entering your bank account and routing numbers on your return, double and triple-check. If you’re unsure, verify the information directly with your bank.

12. Not Keeping Adequate Records

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The IRS can audit tax returns for several years. If you’re claiming deductions or credits, the burden is on you to provide documentation. A shoebox full of crumpled receipts won’t suffice if you’re audited.

Establish an organized record-keeping system for tax documentation, including receipts, bank statements, medical bills, charitable donation records, etc. Keep these records for at least three years, as that’s generally the IRS audit window.

13. Falling for Tax Scams

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Scammers become particularly active around tax season, using fake IRS emails, texts, or phone calls to intimidate taxpayers into giving up money or personal information. Remember, the IRS will generally initiate contact through official mail.

If you receive any suspicious communication claiming to be from the IRS, don’t click any links or provide sensitive information. Report the scam attempt to the IRS directly.

14. Not Planning for the Alternative Minimum Tax (AMT)

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The AMT is a parallel tax system designed to ensure high-income earners pay their fair share, regardless of deductions. It can hit you unexpectedly if you have a large number of itemized deductions or live in a high-tax state.

If you typically claim significant deductions, use an online AMT calculator to see if you might be subject to this tax. Consult the IRS instructions for Form 6251 (used for AMT calculation) for further information.

15. Not Reporting Gambling Winnings

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Yes, the IRS wants a taste of your lucky streak! Gambling winnings are considered taxable income. This includes casino winnings, lottery prizes, and even those office sports pools.

If you hit it big, request a Form W-2G from the payer, as they are required to report large winnings to the IRS. Keep meticulous records of both winnings and losses, as gambling losses can be deducted (up to the amount of your winnings).

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