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Self-Employed: You Can’t Afford to Make These 10 Tax Blunders

When you run your own business, the IRS expects you to play by rules different from those of traditional employees.

By MTN Staff

March 11, 2025 • Advertising Disclosure

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Without a payroll department handling withholdings, you’re responsible for tracking income, calculating quarterly payments, and identifying all eligible deductions.

Making even one of these critical tax mistakes can lead to costly penalties, audit flags, and missing out on substantial tax breaks that could dramatically lower your tax bill.

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1. Skipping quarterly estimated tax payments

Self-Employment Tax Errors
ShutterstockProfessional / Shutterstock.com

Unlike traditional employees with taxes automatically withheld from each paycheck, self-employed individuals must make estimated tax payments four times yearly.

The IRS expects payments in April, June, September, and January of the following year.

Missing these deadlines can result in significant underpayment penalties, even if you pay the full amount owed by the annual tax filing deadline. The penalty typically runs at 0.5% of the unpaid tax per month, plus interest, and can add up quickly over a year.

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2. Mixing personal and business finances

Woman writing a check
Sean Locke Photography / Shutterstock.com

Using the same bank account for business and personal expenses creates a bookkeeping nightmare, making proper tax preparation nearly impossible.

Without clear separation, legitimate business deductions become challenging to identify and substantiate. Opening dedicated business accounts isn’t just good practice—it provides a clear audit trail that helps demonstrate the business purpose of expenses.

This separation also makes it much easier to track business income, prepare financial statements, and identify tax deductions that might otherwise be overlooked.

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3. Not deducting home office expenses

Worried woman doing taxes
fizkes / Shutterstock.com

Many self-employed people work from home but fail to claim the home office deduction because they fear it will trigger an audit.

This misconception eventually costs them thousands in legitimate tax breaks. To qualify, you must use part of your home regularly and exclusively for business.

You can deduct this space using either the simplified method ($5 per square foot, up to 300 square feet) or the regular method, which allows you to deduct a percentage of actual expenses including mortgage interest, insurance, utilities, and repairs based on the percentage of your home used for business.

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4. Forgetting to track vehicle expenses

Man driving an SUV
William Perugini / Shutterstock.com

Business-related driving is fully deductible for self-employed taxpayers, yet many fail to maintain proper mileage logs or track vehicle expenses.

This oversight leaves money that could substantially reduce your tax liability. You can choose between two methods: the standard mileage rate (65.5 cents per mile in 2023) or actual expenses (gas, maintenance, insurance, and depreciation).

Whichever method you choose, you must keep detailed records of business trips, including dates, destinations, purpose, and mileage to substantiate your deduction if questioned.

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5. Misclassifying workers

IRS Form 1099-NEC
Tada Images / Shutterstock.com

Hiring help without understanding worker classification rules can create serious tax problems. Incorrectly treating employees as independent contractors may seem cost-effective but can lead to severe penalties if the IRS disagrees with your classification.

The distinction hinges on control and independence factors. If you control what work is done and how it’s performed, the worker is likely an employee.

For contractors, you control only the result of the work. Misclassification penalties can include back taxes, interest, and additional fines of up to 100% of the employment taxes owed.

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6. Ignoring retirement savings opportunities

Throwing money away
Atsushi Hirao / Shutterstock.com

Without employer-sponsored retirement plans, self-employed individuals must create their own retirement savings strategy.

Many miss out on tax-advantaged options specifically designed for self-employed professionals.

SEP IRAs, Solo 401(k)s, and SIMPLE IRAs offer higher contribution limits than traditional IRAs, allowing you to shelter more income from taxes. In 2023, a Solo 401(k) permits contributions up to $66,000 for those under 50, combining both “employer” and “employee” contributions that you can make as a self-employed person.

Pro Tip: Diversifying retirement assets is crucial for self-employed people without traditional pensions. Protect your wealth with an asset that can hedge against the damaging effects of a recession and financial calamity by opening a gold IRA.

7. Under-reporting income

Uncle Sam holding a percent sign
Jim Barber / Shutterstock.com

The gig economy has complicated income tracking, with payments often coming from multiple sources throughout the year. Failing to report all income, including cash payments, is not just a mistake—it’s a potential criminal offense.

The IRS receives information returns (like 1099-NECs) from companies that paid you, and their systems flag discrepancies between reported payments and your tax return.

With increased focus on tax compliance for self-employed individuals, under-reporting even small amounts can trigger expensive audits and penalties.

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8. Missing out on health insurance deductions

Health Savings Account
Designer491 / Shutterstock.com

Many self-employed taxpayers don’t realize they can deduct 100% of their health insurance premiums, including coverage for spouses and dependents, as an adjustment to income rather than an itemized deduction.

This valuable deduction applies to medical, dental, and qualified long-term care insurance.

The only limitation is that the deduction cannot exceed your net self-employment income for the year, and it’s not available if you’re eligible for coverage through your spouse’s employer plan.

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9. Overlooking business expense deductions

Self-Employment Tax Errors
Vitalii Vodolazskyi / Shutterstock.com

The IRS permits deductions for ordinary and necessary business expenses, but many self-employed individuals miss legitimate write-offs like professional development, industry subscriptions, and membership dues.

Other frequently missed deductions include business insurance premiums, bank fees for business accounts, and internet and phone expenses allocated to business use. Even small deductions add up—a $1,000 deduction can save $370 in taxes for someone in the 37% tax bracket.

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10. Going it alone without professional help

Self-Employment Tax Errors
Andrey_Popov / Shutterstock.com

Tax laws affecting self-employed individuals change frequently, and staying current while running a business is challenging. Attempting to navigate complex tax situations without professional guidance often leads to costly mistakes.

A qualified tax professional specializing in self-employment taxation can identify deductions you might miss, help implement tax planning strategies throughout the year, and ensure compliance with changing regulations.

Their expertise typically pays for itself in tax savings and peace of mind.

Pro Tip: Smart self-employed professionals know when to get help. If you’ve got more than $100,000 in business and personal savings, get advice from a qualified professional. SmartAsset connects you with vetted financial advisors who can provide tax-saving strategies.

Smart tax planning pays dividends

Taxes
Juan Nel / Shutterstock.com

Managing your tax situation requires organization, diligence, and awareness of the special rules that apply to self-employed taxpayers.

Proper record-keeping systems, regular financial reviews, and professional guidance can transform tax time from a stressful scramble into a strategic opportunity to reduce your tax burden.

Avoiding common tax blunders minimizes costly penalties and maximizes deductions, significantly lowering your tax bill and boosting both your business’s bottom line and personal income.

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