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This is one of the most searched questions about S-corporation taxation, and the answer most people find online is technically correct but incomplete. To start with, no, an S-corp generally does not pay federal income tax. The income passes through to the shareholders, who pay tax on their individual returns. That is the foundational feature of S-corp status and the reason most small business owners elect it in the first place.
The part that gets left out is the word "generally." There are specific situations where the S-corp itself does owe federal income tax at the entity level. Most small businesses that elect S-corp status from the start will never encounter them. But for business owners converting from a C corporation, or for those holding significant passive income inside the S-corp, these rules are not hypothetical. They apply, they carry real tax costs, and they need to be understood before any conversion decision is made.
Here is how S-corp taxation works, where the money actually goes, and when the entity-level tax rules come into play.
When an LLC or corporation makes a valid S-corp election, the entity becomes a pass-through for federal income tax purposes. The S-corp files Form 1120-S each year to report its income, deductions, credits, and other items, but the entity itself does not pay income tax on that filing. The tax obligation passes to the shareholders in proportion to their ownership.
Each shareholder receives a Schedule K-1 showing their allocated share of the S-corp's income, losses, deductions, and credits for the year. That K-1 flows into the shareholder's personal Form 1040, and the shareholder pays income tax on their share at their individual rate. For 2026, individual rates range from 10 percent to 37 percent depending on taxable income and filing status.
This is the same pass-through structure that partnerships and multi-member LLCs use, with one important difference. A partnership allocates income according to the terms of the partnership agreement, which can vary by item and by partner. An S-corp allocates income strictly according to ownership percentage. If you own 30 percent of the S-corp, you receive 30 percent of the income on your K-1, regardless of how much the business distributed to you.
Tip: The K-1 income allocated to a shareholder is taxable whether or not the S-corp distributed any money. A shareholder who owns 40 percent of an S-corp that earned $500,000 and distributed nothing will still report $200,000 of income on their personal return and owe tax on it. This is the same phantom income issue that affects partnership taxation and surprises most first-year S-corp shareholders.
Because the S-corp does not pay federal income tax, shareholders bear three categories of tax on income flowing from the business.
The first is income tax on K-1 income. The shareholder's allocated share of S-corp income is reported on Schedule E of the personal return and taxed at ordinary income tax rates. Capital gains allocated from the S-corp retain their character and are taxed at the applicable capital gains rate.
The second is payroll tax on salary. The owner-employee of the S-corp pays their share of Social Security and Medicare taxes through payroll, 7.65 percent on the employee side. The S-corp pays the employer match. For 2026, Social Security applies on wages up to $184,500 and Medicare applies with no cap, with an additional 0.9 percent applying to individual wages above $200,000.
The third is the Net Investment Income Tax, which can apply to shareholders who receive S-corp income from activities in which they do not materially participate. The NIIT is 3.8 percent and applies to individuals with modified adjusted gross income above $200,000 for single filers and $250,000 for joint filers. Active shareholders who materially participate in the business are generally not subject to the NIIT on their S-corp income, but passive shareholders may be.
Tip: If you are a passive investor in an S-corp rather than an active participant in the business, your K-1 income may be subject to the 3.8 percent Net Investment Income Tax on top of ordinary income tax. Whether you meet the material participation tests is not always straightforward. A CPA reviewing your situation annually is the most reliable way to know where you stand.
For most S-corps formed from the start as S-corps, none of the following situations will ever apply. But for any S-corp that was previously a C corporation, or for any S-corp with significant passive income and accumulated earnings from prior C corporation years, understanding these rules is not optional.
When a C corporation converts to S-corp status, any assets that had appreciated in value during the C corporation years carry that appreciation into the S-corp. If the S-corp sells or distributes those appreciated assets within five years of the conversion date, the gain that existed at the time of conversion is subject to the Built-In Gains tax at the current corporate rate of 21 percent.
The purpose of this rule is straightforward. Without it, a C corporation could convert to S-corp status and immediately sell appreciated assets, converting what would have been corporate-level taxable income into pass-through income taxed only at the individual level. The BIG tax prevents that by preserving the corporate-level tax liability on appreciation that occurred before the conversion.
If assets with unrealized appreciation at the time of conversion are held for more than five years after the election date, the BIG tax no longer applies to those assets. For business owners planning a C-to-S conversion, understanding which assets carry built-in gains and what the five-year clock means for any planned sales or distributions is a necessary part of the decision.
Tip: The five-year recognition period for the BIG tax starts on the effective date of the S-corp election, not the filing date of Form 2553. If your C corporation has significant appreciated real estate, equipment, or other assets, work through the BIG tax exposure with a CPA before completing the conversion. In some cases, waiting to sell certain assets until after the five-year window closes is more tax-efficient than converting and selling immediately.
An S-corp that was previously a C corporation may have accumulated earnings and profits from its C corporation years sitting on the books. If that S-corp also receives net passive income exceeding 25 percent of its gross receipts in a given year, the excess passive income is subject to tax at the corporate rate of 21 percent.
Passive income for this purpose includes interest, dividends, rents, royalties, and capital gains from the sale of assets held for investment. A business that has rental income or investment income as a significant portion of its gross receipts and also carries C corporation accumulated earnings and profits needs to monitor this threshold carefully.
The rule becomes more serious over time. If the S-corp triggers the excess net passive income tax for three consecutive years, the S-corp election is automatically terminated. The entity reverts to C corporation status, and it cannot re-elect S-corp treatment for five years without IRS consent. Losing the S-corp election through passive income violations is one of the quieter but more costly mistakes in S-corp compliance.
Tip: An S-corp with accumulated C corporation earnings and profits can eliminate the excess passive income problem by distributing those accumulated earnings to shareholders as a taxable dividend, which removes the earnings and profits balance from the books. The distribution is taxable to shareholders in the year received but eliminates the ongoing passive income tax risk and the termination threat. The tradeoff between paying tax now and accepting the ongoing risk is something to evaluate with a CPA annually.
This situation applies to a narrow group of businesses, those that were C corporations, used the LIFO inventory accounting method, and then converted to S-corp status. When that conversion occurs, the C corporation is required to recognize the difference between the value of its inventory under LIFO and what that inventory would have been worth under FIFO accounting. That difference is included in income for the last C corporation tax year and triggers additional tax.
Most small businesses do not use LIFO inventory accounting. Standard small business accounting software does not support it, and it is primarily used by larger businesses or industries where inventory costs rise predictably over time. For businesses that do use LIFO, the recapture tax is calculated on the C corporation's final return before conversion, and the additional tax is paid in four equal installments over four years.
Tip: If your business uses or has used LIFO inventory accounting and is considering an S-corp election, the LIFO recapture calculation belongs in the financial analysis before the election is made, not after. The tax can be significant enough to affect whether the conversion makes financial sense.
Even in years when none of the entity-level taxes above apply, the S-corp is not entirely free of tax obligations. Understanding what the business is still responsible for keeps the books clean and the IRS at a comfortable distance.
The S-corp owes payroll taxes on wages paid to owner-employees and any other W-2 employees. Social Security, Medicare, and federal unemployment taxes all apply at the entity level for wages paid, and these must be deposited and reported on the required quarterly and annual schedules.
The S-corp must file Form 1120-S by March 16, 2026 for the 2025 tax year. If the filing deadline is missed, the failure-to-file penalty is $235 per shareholder per month for up to 12 months. For an S-corp with four shareholders filing three months late without an extension, that is $2,820 in penalties before any other consequences are assessed.
For S-corps operating in Texas, the Texas franchise tax may apply depending on the entity's gross revenue. Federal pass-through treatment does not eliminate state-level tax obligations, and the rules differ significantly by state for S-corps operating across multiple jurisdictions.
Tip: Extensions filed using Form 7004 by the March 16, 2026 deadline extend the Form 1120-S filing deadline to September 15, 2026. Extensions only extend the time to file, not the time to pay. Any entity-level tax owed, such as a BIG tax liability, must still be estimated and paid by the original deadline to avoid interest and penalties.
For the vast majority of small business owners who elect S-corp status, the entity pays no federal income tax. The income passes through, the shareholders pay tax on their K-1 income, and the payroll taxes on the owner's salary are the primary federal obligation at the entity level. That is the structure that produces the self-employment tax savings the election is designed to create.
For business owners converting from C corporation status or operating an S-corp with significant passive income and prior C corporation earnings, the BIG tax, the excess net passive income tax, and the LIFO recapture rules are real obligations that require active planning and monitoring. Getting the conversion right and staying on the right side of the passive income threshold are exactly the situations where having a CPA handling your S-corp tax preparation pays for itself.
At TrueView CPA, S-corp tax return preparation and S-corporation tax filing services for business owners across Dallas and Texas are built around making sure every entity-level obligation is identified, planned for, and handled correctly before it becomes a problem. If you have questions about how your S-corp is taxed or want a second opinion on a conversion you are considering, we are ready to start with a conversation.
Have questions about S-Corp taxes? Schedule a call with our tax experts today.
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