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Business owners face two distinct federal tax obligations that run on separate tracks, follow different rules, and carry different consequences when they go unpaid. Conflating them is one of the most expensive mistakes we see.
Payroll tax and income tax are not the same thing, and treating them as interchangeable creates serious exposure.
Key Takeaways
- Payroll taxes fund Social Security and Medicare. Income taxes fund general federal operations. Both flow to the IRS, but the legal authority and collection rules differ.
- Self-employed individuals pay self-employment (SE) tax at 15.3% on net earnings up to $184,500 (2026), covering both the employee and employer share of FICA.
- Business owners who have employees hold payroll taxes in trust for the government. Failing to remit those taxes can result in personal liability under IRC 6672 regardless of the business structure.
- Income tax operates on taxable income after deductions. Payroll tax operates on gross wages, largely without deduction.
- Delinquent payroll taxes are among the most aggressive collection situations the IRS pursues. The Trust Fund Recovery Penalty pierces the corporate veil entirely.
What Is Payroll Tax?
Payroll tax refers to the Federal Insurance Contributions Act (FICA) taxes imposed under IRC sections 3101 and 3111. Two components make it up:
- Social Security tax: 6.2% paid by the employee, 6.2% paid by the employer, for a combined 12.4%. In 2026, this applies to the first $184,500 of wages. Above that threshold, no Social Security tax applies.
- Medicare tax: 1.45% paid by the employee, 1.45% paid by the employer, for a combined 2.9%. There is no wage base cap on Medicare. High earners also pay an Additional Medicare Tax of 0.9% on wages exceeding $200,000 (single) or $250,000 (married filing jointly), though employers do not match this additional amount.
When a business has employees, the employer withholds the employee share from each paycheck and contributes the employer matching share on top. Both amounts get deposited with the IRS, typically on a semi-weekly or monthly schedule depending on deposit liability size.
The withheld employee portion is the piece that triggers the most severe collection consequence when not remitted. That amount is considered trust fund money: the employer held it in trust on behalf of the employee, and the IRS views its diversion to other business purposes as a serious breach.
What Is Income Tax?
Income tax is a tax on taxable income: gross revenue less allowable deductions. It is imposed under IRC section 1 for individuals and section 11 for corporations. The rate structure is graduated for individuals, meaning income is taxed at increasing rates as it moves through brackets.
For business owners, the income tax picture depends heavily on entity structure:
- Sole proprietors and single-member LLCs: Business profit flows directly onto the owner Form 1040 via Schedule C. The IRS taxes it as ordinary income.
- S corporations: Profit passes through to shareholders and is reported on their individual returns. Reasonable compensation paid to shareholder-employees is subject to FICA; distributions are not.
- Partnerships and multi-member LLCs: Income passes through to partners via Schedule K-1. General partners pay self-employment tax on their distributive share. Limited partners generally do not.
- C corporations: The entity pays corporate income tax at a flat 21% rate. Owners then pay tax again on dividends received, creating the familiar double-taxation structure.
Income tax is paid through withholding and quarterly estimated payments. Underpayment of estimated tax generates a penalty under IRC section 6654, but the failure does not expose officers or owners to personal liability the way payroll tax failures do.
How Self-Employment Tax Works
Self-employed individuals and most general partners do not have an employer to match their FICA contributions. They pay both halves themselves under the Self-Employment Contributions Act (SECA), codified at IRC section 1401.
For 2026, the combined SE tax rate is 15.3%:
- 12.4% for Social Security, applied to the first $184,500 of net self-employment income
- 2.9% for Medicare, applied to all net self-employment income with no cap
SE tax is calculated on 92.35% of net self-employment income, not the gross figure. That adjustment exists because the Social Security and Medicare tax itself reduces net earnings, and the formula accounts for that recursion. The result is a slightly lower effective base than the top-line net profit number.
Self-employed individuals can deduct half of their SE tax as an above-the-line deduction on Form 1040, under IRC section 164(f). This deduction reduces adjusted gross income, which in turn reduces income tax. It does not reduce the SE tax itself.
This deduction is frequently missed or misunderstood. A sole proprietor netting $100,000 pays roughly $14,129 in SE tax and can deduct approximately $7,065 from gross income before computing income tax. The two calculations run in parallel but interact at that one point.
The Trust Fund Recovery Penalty: Where Payroll Failures Get Dangerous
When a business fails to remit employment taxes, the IRS does not simply add the balance to a collection queue. For the trust fund portion, specifically the withheld income tax and employee FICA contributions, the IRS has a separate tool that makes this personal.
Under IRC section 6672, any person who is responsible for collecting, accounting for, and paying over trust fund taxes, and who willfully fails to do so, faces a penalty equal to 100% of the unpaid trust fund amount. The penalty is assessed against the individual, not the entity. Corporate bankruptcy does not discharge it. Dissolution of the LLC does not extinguish it. Selling the business does not transfer it away.
Responsible person under section 6672 is defined broadly. The IRS has asserted the penalty against owners, officers, bookkeepers, signatories on the payroll account, and in some cases outside accountants who had sufficient control and knowledge. The determination turns on authority and awareness, not job title.
Willfulness in this context means the person knew trust fund taxes were owed and chose to pay other creditors first, or simply failed to act despite awareness. It does not require intentional fraud. Courts have consistently held that continuing to operate and pay vendors while trust fund taxes go unremitted satisfies the willfulness standard.
The Trust Fund Recovery Penalty is one of the few IRS liabilities that follows individuals for the full collection statute, 10 years from assessment, with no discharge available in bankruptcy under most circumstances.
Why the Distinction Matters in a Collection Context
Business owners who owe both payroll tax and income tax face a tiered collection priority that most people do not understand until it is too late.
The IRS generally works payroll tax delinquencies harder and faster than income tax delinquencies of comparable size. Revenue officers are assigned to employment tax cases sooner. Federal Tax Liens for payroll tax attach to business assets promptly. And the TFRP assessment process runs concurrently with the business liability, creating a parallel individual liability that multiplies the collection exposure.
Income tax delinquencies follow a more predictable escalation path: assessment, notice sequence, Final Notice of Intent to Levy, CDP rights, then enforcement. Resolution tools including installment agreements, currently not collectible status, and offers in compromise are available for both payroll and income tax.
However, installment agreements covering payroll tax delinquencies include a compliance condition that does not exist for income tax arrangements: the business must remain current on all payroll deposits going forward. A single quarter of non-compliance voids the agreement and restores the IRS full enforcement posture immediately.
What Business Owners Often Get Wrong
Two patterns show up repeatedly:
Treating payroll taxes as a cash flow solution. When cash is tight, some business owners skip payroll deposits and intend to catch up next quarter. The IRS treats this as misappropriation of trust funds. By the time the IRS issues a 941 notice, the penalties and interest have already compounded, and the TFRP clock is running.
Assuming the entity shields them. An LLC or corporation does not protect officers and owners from the TFRP. The protection that a business entity provides against personal liability does not extend to federal trust fund taxes. This is a statutory exception, not a gap that can be closed by operating correctly in other respects.
If a business is behind on payroll taxes, or if our firm is evaluating whether a TFRP assessment is coming, the first question is not how much is owed but who is exposed and what is the factual record on authority and awareness. That determines the scope of the problem.
The Bottom Line
Payroll tax and income tax run on separate legal frameworks and carry different consequences in a delinquency context. Understanding the distinction is not an academic exercise. It determines who is liable, what tools are available to resolve the debt, and what the collection exposure actually is.
For business owners managing both types of obligations, the compliance priority is clear: payroll deposits come first. The cost of non-compliance is personal and permanent in a way that income tax delinquency typically is not.
If your business is behind on payroll taxes, or if you have received a notice related to a Trust Fund Recovery Penalty assessment, contact our firm immediately. The window to limit personal exposure narrows quickly once the IRS begins its interview process.
Matt Wildes, JD | CLAW Tax Group / Wildes At Law
Schedule a consultation or call (651) 323-2255.
The content of this article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional for guidance specific to your situation.
