Why Do I Owe Taxes This Year? 8 Common Causes

So, you were expecting a tax refund — maybe even had plans for it — but instead, you owe Uncle Sam. WTH? Turns out, the fiscal year can be full of surprises, and sometimes, those surprises come in the form of an unexpected tax bill. 

Before you start stress-Googling “Why do I owe taxes this year?” let’s break it down. From tax withholding mishaps to changes in your tax bracket, we’ll uncover the reasons why your tax return took an unexpected turn.

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Table of contents

• Reasons why you owe taxes this year

• What should you do if you owe taxes?

• How much should you save for taxes in advance? 

• How to not owe taxes

• What happens if you owe more taxes than you can pay? 

Reasons why you owe taxes this year

Let’s get straight to it. Here’s why your tax return might not be as friendly as you’d hoped.

1. Changes in overall income

Got a raise? Started a side hustle? Cashed in on a big bonus? All of these can bump you into a higher tax bracket, meaning the government takes a bigger slice of your taxable income. While making more money is always a win, it’s also why you might be seeing a surprise income tax bill.

2. Capital gains from selling investments

Capital gains are defined as the profit from selling an asset, such as a stock, mutual fund, or ETF. If you sold stocks, crypto, or even NFTs, then you might owe capital gains tax. Short-term gains — profits from assets held for under a year—are taxed at your regular tax rate. Long-term gains? They get a friendlier rate, but they’re still taxable. 

3. Insufficient tax withholding from your paycheck

That trusty W-4 form you filled out when you started your job? It determines how much tax withholding happens each paycheck. If you didn’t update it after a life change — like getting married, having kids, or buying a house — your employer might not be withholding enough. That means a bigger tax bill riiiight about now.

4. Loss of deductions or credits

Not all tax credits and tax deductions last forever. If you can’t claim the Earned Income Tax Credit, child tax credit, or other major benefits this year, your tax rate could climb. Life events like a kid aging out of a tax credit or your income exceeding eligibility limits can change your tax refund outcome.

5. Self-employment income without quarterly tax payments

Freelancers, side hustlers, and business owners — this one’s for you. The IRS expects you to pay as you go, not just at tax time. If you didn’t make quarterly estimated tax payments, you could be hit with not just a tax bill but also penalties for late payments.

6. Withdrawal from a retirement account

Tapping into your 401(k) or IRA before age 59.5?  Withdrawals from retirement accounts are usually considered taxable income. The IRS sees that as a big no-no. Unless it’s a qualified distribution, you’ll owe income tax on the withdrawal — plus a 10% penalty. That’s a costly way to get quick cash.

7. Updated your FSA or HSA contributions

Changes to your Flexible Spending Account (FSA) or Health Savings Account (HSA) contributions can also affect your taxes. Both offer great tax benefits when used correctly. If you didn’t spend all your FSA funds, the leftover amount might be taxable. Similarly, not maxing out your HSA contributions could mean you missed out on some tax savings.

8. Significant changes in your life

Major life milestones shake up your taxes in ways you might not expect:

• Got married: Congrats! But your new tax bracket might not be as kind as you’d hoped.

• Have kids (or parents live with you): You may qualify for the child tax credit, but make sure you claim it correctly (this is where a certified tax professional can seriously help).

• Changed jobs: Your new employer might not be withholding enough taxes.

• Bought a house: Homeownership opens up tax deductions, but only if you meet the right criteria.

• Bought an electric vehicle: Some EVs qualify for tax credits, but not all — check the fine print.

9. You sold digital assets

NFTs, Bitcoin, Ethereum — if you sold digital assets, expect to pay up. The IRS treats them like property, meaning capital gains tax applies. If you traded frequently, you could owe taxes on multiple transactions.

What should you do if you owe taxes?

If you’re staring down a tax bill, don’t panic. You have options:

1. File your return on time: File your return on time – Even if you can’t pay immediately, filing on time avoids extra penalties.

2. Set up a payment plan: The IRS offers payment installment agreements so you can spread payments over time.

3. Consider a loan: If the interest rate on a personal loan is lower than IRS penalties, it might potentially be a smart move.

4. Adjust your withholding: To avoid the same issue next year, update your W-4 or make estimated tax payments.

How much should you save for taxes in advance? 

If you’re self-employed or have side income, plan ahead by setting aside 15-30% of your earnings for taxes. Use a high-yield savings account to stash your tax payments while earning some interest.

Looking for a savings account where you can temporarily put your tax payments and get interest? MoneyLion offers a convenient marketplace to compare high-yield savings accounts from our trusted partners that could help grow your money.

How to not owe taxes

Let’s get proactive. Here’s how you can dodge a surprise tax bill next time:

Keep accurate and organized records of income and expenses all year

Accurate records ensure you’re reporting correctly and can claim all eligible deductions. Track your income and expenses meticulously to avoid surprises.

Pay estimated taxes quarterly 

Pay estimated taxes quarterly if you have non-wage income, like self-employment or investments. This helps spread out your tax liability and avoid a massive bill in April.

Stay informed about changes in tax laws and regulations 

Tax laws change often, affecting your liability. Stay updated on new tax regulations to plan accordingly.

Review and adjust tax withholdings on paychecks

Check your withholdings regularly, especially after major life changes like getting married or switching jobs. Adjusting your W-4 form can help ensure the correct amount is withheld.

Consult with a tax professional or accountant 

A tax professional can help you optimize your tax strategy, ensure you’re taking advantage of all deductions and credits that you might miss on your own, and help you plan better for the future.

What happens if you owe more taxes than you can pay? 

If your tax bill is more than you can handle, don’t panic. The IRS offers options:

• Installment agreements: Pay your tax debt over time through monthly payments.

• Offer in compromise: An offer in compromise (OIC) lets eligible taxpayers settle tax debt for less than they owe if the IRS believes full collection isn’t feasible. To qualify, you must prove Doubt as to Collectibility (can’t afford to pay), Doubt as to Liability (IRS error), or Effective Tax Administration (paying causes extreme hardship). The IRS reviews your income, expenses, and assets before deciding. If approved, you can settle with a lump sum or structured payments, but low offers get rejected. Working with a tax professional can be very helpful here. 

• Temporary delay: If paying now would cause financial hardship, you might qualify for a temporary hold. Of course, you’ll still need to pay later so don’t consider that license to rack up a little extra credit card debt…. 

Don’t Let Taxes Catch You Off Guard (Again)

Surprise tax bills aren’t fun, but they are avoidable. By planning ahead, adjusting your tax withholding, and keeping up with tax law changes, you can prevent another shock next year. And if you need a personal loan to handle your bill now, MoneyLion has your back.

FAQs 

Can cancellation of debt lead to owing taxes?

Yes. If a lender forgives your debt, the IRS often considers it taxable income — unless an exemption applies.

How do errors on my tax return affect what I owe?

Mistakes can lead to underpayment, meaning you owe more when the IRS corrects it.

Can claiming too many tax credits result in owing taxes?

It depends — if your tax credits were miscalculated or no longer apply, you might owe more.

How do you end up owing taxes?

If you didn’t pay enough throughout the year via tax withholding or estimated payments, you’ll owe.

How do I avoid owing taxes?

Adjust your tax withholding, make quarterly estimated payments, and maximize tax deductions and credits.

Why do I owe taxes this year when nothing changed?

Even small changes in tax rate, new tax bracket, or deductions can impact your tax return.

Is it common to owe taxes?

Yes — especially for freelancers, those with multiple income streams, or people who don’t adjust their tax withholding.

Why do I owe taxes this year if I never have before?

Changes in income, deductions, or tax credits can result in a different outcome.