Why Do Small Business Owners Owe So Much in Taxes?

If you filed your return and got a number that made your stomach drop, you are not alone. Most small business owners who owe a large tax bill can trace it back to one — or more than one — of six common reasons: no tax planning during the year, a capital gains event, a premium tax credit payback, distributions taken in excess of basis, self-employment tax they did not account for, or simply no estimated tax payments along the way. The good news is that every one of these is preventable with the right advisory relationship.

Key Takeaways

• Six specific reasons drive the majority of surprise tax bills for small business owners.
• Most of them are preventable — but only if someone is watching during the year, not after.
• A large tax bill at filing time is almost always a symptom of a gap in tax planning.
• Accounting Freedom’s Core+ and CorePro packages include proactive tax planning designed to eliminate these surprises.

Filed your return. Opened the number. Felt that sinking feeling.

You are not alone. In 40+ years of working with small business owners across Illinois and Wisconsin, this is one of the most common calls we get: “Why do I owe so much?”

The answer is almost never “because you had a good year” — although that can contribute. The answer is usually one of six specific, preventable things. Here they are, in plain English.

Reason 1: No Tax Planning During the Year

This is the big one. It accounts for more surprise tax bills than any other factor.

Tax planning is not the same as tax preparation. Preparation is what happens after the year ends — your accountant takes what happened and reports it. Planning is what happens during the year — your advisor looks ahead, runs projections, and helps you make decisions that reduce your liability before it is locked in.

If your accounting relationship is “call us in March and we will file your return,” you have a preparation relationship. You do not have a planning relationship.

What tax planning actually does:

• Runs mid-year projections to estimate what you will owe
• Identifies deduction opportunities before year-end (equipment purchases, retirement contributions, etc.)
• Advises on owner compensation structure to reduce self-employment and income tax
• Flags estimated tax payment shortfalls before they become penalties

At Accounting Freedom, tax planning is built into our Core+ and CorePro packages — not sold as a separate engagement every November. If you are a Core client (compliance-only), proactive planning starts at Core+.

Reason 2: You Sold an Investment or Business Asset

Capital gains are one of the most common sources of unexpected tax bills — and one of the most misunderstood.

When you sell a piece of equipment, real estate, or an investment that has gone up in value, the gain is taxable. How much you owe depends on how long you held it, what type of asset it was, and what your overall income looks like for the year.

The problem is that many business owners sell something mid-year — a truck, a building, a piece of land — without getting a tax projection first. The cash hits the bank account. The tax bill arrives later.

What this means for you: if you are planning to sell any significant business or personal asset, run it by your advisor before you close. The difference between selling in December and January could be meaningful. And knowing the tax hit in advance lets you plan for it instead of being blindsided.

Reason 3: Premium Tax Credit Payback

This one surprises a lot of people.

If you purchased health insurance through the Marketplace (Healthcare.gov) and received a Premium Tax Credit to help cover the cost, that credit was based on your estimated income for the year. If your actual income came in higher than what you estimated when you enrolled — which happens often for business owners, whose income is harder to predict — you may have to pay some or all of that credit back when you file.

The Marketplace credits are advance payments. They are calculated on a projection. When reality differs from the projection, there is a reconciliation at tax time.

How to avoid this: if your income changes significantly during the year, update your income estimate on Healthcare.gov. It takes a few minutes and can prevent a meaningful payback at filing. Your advisor should be flagging this during the year if you are on a Marketplace plan.

Reason 4: Distributions Taken in Excess of Basis

This one is specific to S-corp and partnership owners, and it catches people off guard.

When you take distributions from your S-corp or partnership, those distributions are generally not taxable — as long as you have sufficient basis. Basis is essentially your investment in the business, adjusted for income, losses, and prior distributions.

The problem happens when distributions exceed basis. When that occurs, the excess is treated as a capital gain and taxed accordingly. Many owners do not track their basis closely — or at all — until their accountant delivers the news at filing time.

What this means for you: basis tracking is not optional if you are taking regular distributions from an S-corp or partnership. It should be part of your ongoing accounting work, not a year-end surprise. If your current accountant is not tracking it for you, ask why.

Reason 5: Self-Employment Tax

If you are a sole proprietor or single-member LLC taxed as a sole proprietor, self-employment tax is likely your single largest tax liability — and it is one of the least understood.

Self-employment tax is 15.3% on your net self-employment income, up to the Social Security wage base, and 2.9% above that. It covers both the employee and employer share of Social Security and Medicare. When you work for someone else, your employer covers half. When you work for yourself, you cover all of it.

On $100,000 of net self-employment income, that is roughly $14,130 in self-employment tax before income tax even enters the picture.

Many business owners — especially in their first few years — do not account for this when they are setting aside money for taxes. They see a number on their P&L and assume that is their tax exposure. It is not. Self-employment tax is layered on top of income tax, not included in it.

The fix: entity structure review. Depending on your income level, electing S-corp status can significantly reduce self-employment tax exposure. This is one of the first things we look at with new Core+ clients.

Reason 6: No Estimated Tax Payments

The U.S. tax system is pay-as-you-go. Employees have taxes withheld from every paycheck. Business owners are expected to make quarterly estimated tax payments to cover income and self-employment tax as they earn it.

If you did not make estimated payments during the year — or if you underpaid — you will owe the full balance at filing. And depending on how significant the underpayment was, you may also owe a penalty.

This is especially common in a business’s first strong year. Revenue jumps, the owner is focused on operations, estimated payments fall through the cracks, and then April arrives with a very large number.

What this means for you: quarterly estimated payments should be calculated and calendared at the start of each year, then adjusted mid-year if income is running ahead of or behind projections. This is not complicated — it just requires someone to be paying attention.

What This Means for You

If you see your situation in one or more of these reasons, the conversation to have is not “how do I pay this bill” — it is “how do I make sure this does not happen again.”

That conversation starts with an advisory relationship, not just a compliance relationship. At Accounting Freedom, here is how our packages address each of these:

Issue	Core ($130/wk)	Core+ ($175/wk)
No tax planning	Not included	Included — mid-year projections, year-end planning
Capital gains surprise	Not included	Flagged during year — sell-before-you-close guidance
Premium tax credit payback	Not included	Income monitoring — update Marketplace when needed
Distributions in excess of basis	Tracked as part of tax prep	Basis tracking + advisory guardrails
Self-employment tax	Reported at filing	Entity structure review — S-corp analysis included
No estimated tax payments	Not monitored	Quarterly estimated payments calculated

Ready to Stop Guessing and Start Planning?

If this year’s tax bill was a surprise, next year does not have to be. Use our pricing calculator to get an instant estimate, or take the 7-question package assessment to see which tier fits your business.

Pricing calculator: https://www.accountingfreedom.com/pricing/

Package assessment: https://www.accountingfreedom.com/which-accounting-package-tier-is-best-for-my-business/

Or schedule a consultation: https://www.accountingfreedom.com/schedule-an-appointment/

DISCLAIMER

This article is provided for general informational purposes only and does not constitute tax, legal, accounting, or financial advice. Every business situation is different. Before acting on anything you read here, please consult with a qualified advisor — including, we hope, us. Reach out to Accounting Freedom for guidance specific to your situation.

About the Author

Frank Fiore is a CPA and the Visionary at Accounting Freedom, a small business accounting and tax firm with offices in Mundelein, IL and Grafton, WI. He has spent 20+ years helping small business owners across Illinois and Wisconsin keep more of what they earn. Frank also leads Payroll Freedom, the firm’s sister payroll services brand.