Common tax deduction mistakes include claiming personal expenses as business costs, neglecting to keep proper documentation, miscalculating mileage, and failing to understand IRS rules for depreciation. Other errors involve overstating deductions, missing deadlines, or ignoring eligibility criteria, which can lead to audits, penalties, and delayed refunds.
Avoid These Common Tax Mistakes
Overlooking deductions can cause you to overpay your taxes. Congress revamped several key tax breaks in 2017. Pay attention to child care expenses, medical bills, state sales taxes and student loan interest.
The IRS uses a combination of automated and human processes to select which tax returns to audit. Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit.
Basically, the de minimis safe harbor allows businesses to deduct in one year the cost of certain long-term property items. IRS regulations set a maximum dollar amount—$2,500, in most cases—that may be expensed as "de minimis," which is Latin for "minor" or "inconsequential." (IRS Reg. §1.263(a)-1(f) (2025).)
Yes, interest paid on business loans is generally 100% tax-deductible as a business expense. This includes interest on business credit cards, lines of credit, mortgages for business property, and equipment loans.
According to the IRS, capital improvements aren't immediately tax deductible but can affect the taxes you pay when you sell the property. This is why keeping receipts and documentation is so important for homeowners. Make sure you have paper and electronic copies.
Businesses that show losses are more likely to be audited, especially if the losses are recurring. The IRS might suspect that you must be making more money than you're reporting. Otherwise, why would you stay in business? Most likely to be audited are taxpayers reporting small business losses.
Over-deducting business expenses means claiming expenses that aren't legitimately deductible or claiming too many deductions on your tax returns. This can result in a lower taxable income but can hurt your financial situation in the long run.
The “Five C's” are criteria, condition, cause, consequence, and corrective action.
Wages, dividends, bank interest, and other income received and that was reported on an information return should be entered carefully. This includes any information needed to calculated credits and deductions.
10 of the Largest Tax Breaks Explained
Common Tax Deductions You Can Claim Without Receipts
Child and Dependent Care Credit
So missing one is even more painful than missing a deduction that simply reduces the amount of income that's subject to tax. But it's easy to overlook the Child and Dependent Care Credit if you pay your childcare bills through a reimbursement account at work.
In 2021, Congress lowered the threshold for reporting income on payment apps from $20,000 and 200 transactions annually to $600 for a single transaction.
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Unreimbursed employee expenses are perceived to be one of the most common IRS red flags. The IRS frequently reviews unreimbursed employee expenses in audits, as they are widely considered a high abuse category for W2 employees.
Ten Red Flags that Could Trigger an IRS Audit
We may be able to remove or reduce some penalties if you acted in good faith and can show reasonable cause for why you weren't able to meet your tax obligations. By law we cannot remove or reduce interest unless the penalty is removed or reduced.
If the deductions, losses, or credits on your return are disproportionately large compared with your income, the IRS may want to take a second look at your return. Taking a big loss from the sale of rental property or other investments can also spike the IRS's curiosity.
7 years - For filing a claim for credit or refund due to an overpayment resulting from a bad debt deduction or a loss from worthless securities, the time to make the claim is 7 years from the date the return was due.
What Not to Say During an Audit?
Deductible house-related expenses
Avoid These Mistakes When DIYing Home Improvement Projects
New flooring is typically considered a capital improvement, which has tax benefits when you go to sell. Capital improvements include additions to a property that raise its value, energy-saving features, or adaptations for future use.