The 5-year rule for S corps is not about waiting to take distributions. It is not a probationary period. It is a tax rule that can eliminate every dollar of s corp tax savings you thought you locked in — if you sell assets or convert your entity at the wrong time.
Here is what it actually is. When a C corporation elects S corporation status, any assets that had built-in gains at the time of that election remain subject to corporate-level tax if sold within five years. That tax is called the Built-In Gains tax, codified under IRC §1374. The rate is 21%. And it applies even though you are now an S corporation, even though S corps are supposed to be pass-through entities, and even though you believed you had already escaped the C-corp tax regime.
The rule exists because Congress was not going to let businesses convert to S status purely to avoid paying corporate tax on appreciated assets. If you had a warehouse worth $2 million on your books at the time of conversion, and your basis in that warehouse was $500,000, you have $1.5 million in built-in gain. Sell that warehouse in year three of your S election, and the corporation pays 21% on that $1.5 million before a single dollar passes through to you. That is $315,000 in tax that your S-corp tax savings calculator did not account for.
The 5-Year Rule Is a Tax Trap, Not a Technicality
The recognition period under IRC §1374 is five years from the date of the S election. During those five years, any disposition of an asset that had a built-in gain on the conversion date triggers the Built-In Gains tax at the corporate rate. After five years, that exposure disappears entirely. The asset can be sold, the business can be wound down, and the S corporation's pass-through character applies without a corporate-level tax carving into the proceeds.
This matters most in two scenarios. The first is a business owner who converts from a C corp to an S corp and then receives an acquisition offer within the recognition period. The deal looks clean until someone runs the tax analysis and discovers that the built-in gains tax will cost seven figures before the purchase price ever reaches the seller's pocket. The second scenario is the business that accumulates appreciated assets — real estate, intellectual property, goodwill — and converts to S status without realizing that a future sale of those assets will be taxed twice: once at the corporate level under §1374, and again at the shareholder level when the gain passes through.
The built-in gain is calculated as of the date of conversion, not the date of sale. If an asset was worth $800,000 when you converted and sells for $1.2 million in year four, the built-in gain is capped at $400,000 (the appreciation that existed at conversion). Any additional gain recognized above that amount is treated as ordinary S-corp income and passes through to shareholders without corporate-level tax. This distinction matters, and most people do not know to ask for it.
There is also a net unrealized built-in gain limitation. The total amount subject to the Built-In Gains tax in any given year cannot exceed the net unrealized built-in gain that existed at the time of conversion, reduced by any built-in gains already recognized in prior years. In plain terms: the exposure has a ceiling, but that ceiling can still be very high for asset-heavy businesses.
One more thing your CPA may not have flagged. The five-year clock starts on the first day of the first taxable year for which the S election is effective. If your election was effective January 1, 2022, your recognition period ends on December 31, 2026. If you are planning a sale or a significant asset disposition, the timing of that transaction relative to this date is not a minor detail. It is potentially a six-figure decision.
Why You Elected S Corp Status in the First Place (S Corp Tax Savings, Explained Honestly)
The reason anyone becomes an S corporation is self-employment tax. That is the honest answer. When you operate as a sole proprietor or a single-member LLC taxed as a disregarded entity, every dollar of net profit is subject to self-employment tax at 15.3% up to the Social Security wage base, and 2.9% above it. On $200,000 of profit, that is a significant number. The S-corp structure changes that math.
As an S corporation shareholder-employee, you pay yourself a reasonable salary. That salary is subject to payroll taxes — both the employee and employer sides of FICA. But distributions above that salary are not subject to self-employment tax. They pass through to your personal return as ordinary income, and you pay federal income tax on them, but you skip the payroll tax entirely. On a $150,000 profit where you pay yourself $90,000 in salary, you save payroll taxes on $60,000. At 15.3%, that is roughly $9,180 in annual savings, before accounting for the employer deduction.
The s corp vs sole proprietorship tax savings comparison looks compelling in that example, and it often is. But the savings are real only if the structure is maintained correctly. The IRS has been aggressive about reasonable compensation audits. If you pay yourself $30,000 in salary and take $170,000 in distributions on a $200,000 profit, you are not being clever. You are being audited. The agency looks at what someone in your role and industry would earn as an employee, and it will reclassify distributions as wages if your salary does not pass that test. The back taxes, penalties, and interest on a reclassification are not a theoretical risk. They are a documented enforcement priority.
The s corp vs llc tax savings question comes down to volume. Below roughly $40,000 to $50,000 in net profit, the cost of maintaining an S corp — payroll processing, separate tax filings, additional compliance — often exceeds the savings. Above that threshold, the math starts working in your favor. The exact number depends on your state, your salary, and your expense structure, which is why an s corp tax savings calculator gives you a starting point, not a strategy.
Under IRC §199A, S-corp owners may also be eligible for the qualified business income deduction, which allows a deduction of up to 20% of qualified business income. The One Big Beautiful Bill Act, if enacted as proposed, would make this deduction permanent. For a business generating $300,000 in QBI, that is a $60,000 deduction at the federal level. It does not apply to W-2 wages paid to yourself, only to the pass-through income. This is one of the structural reasons the salary-versus-distribution split matters so much in S-corp planning — it affects not just payroll tax exposure but also your QBI deduction base.
The Two Disadvantages Nobody Mentions When They're Selling You the S-Corp Dream
The first disadvantage is California. California does not conform to the federal S-corp pass-through treatment in the way most people assume. The state imposes a 1.5% franchise tax on S corporation net income, with a minimum of $800 annually. If your S corp earns $500,000 in net income, California charges $7,500 before you see a dollar of it. That does not eliminate the federal savings, but it reduces them, and it is a number that should be in your projections before you elect.
The second disadvantage is the built-in gains rule we just discussed, but the version that surprises people is not the C-to-S conversion. It is the business that was always an S corp, grows substantially in value, and then considers converting to a C corp to access institutional investment or a different capital structure. The moment that business converts back to C status and then tries to sell appreciated assets, the analysis reverses. Planning the exit from an S corp requires the same attention to entity history and asset basis that the entry did.
There is also the shareholder restriction problem. Under IRC §1361, an S corporation cannot have more than 100 shareholders, cannot have non-resident alien shareholders, and can only have one class of stock. If you are building a business you intend to scale with investor capital, these restrictions will eventually become a structural problem. Sophisticated investors often want preferred stock with liquidation preferences — that is a second class of stock, and it terminates your S election automatically under §1362(d). Nobody tells you this when they are celebrating your election paperwork.
What 2026 Changes — and What It Doesn't — About S Corp Tax Strategy
The One Big Beautiful Bill Act proposes to make the 20% pass-through deduction under IRC §199A permanent. It also proposes to lock in the 21% corporate tax rate. If that legislation passes, the federal landscape for S-corp planning becomes more predictable, not less. The incentive to maintain S-corp status for the QBI deduction becomes a long-term calculation rather than a year-by-year one.
IRC §163(j) changes in 2026 shift the business interest expense limitation calculation back to an EBITDA basis rather than EBIT. For S corporations carrying debt, this means more interest expense may be deductible. If your S corp has financed equipment, real estate, or an acquisition, this change is worth running through your numbers with a tax professional before the year closes.
The Form 1120-S filing deadline for the 2025 tax year is March 16, 2026. The late-filing penalty is $255 per shareholder per month. If you have five shareholders and miss the deadline by three months, that is $3,825 in penalties on top of whatever you owe. An extension using Form 7004 pushes the deadline to September 15, 2026, but it does not extend the time to pay. If you owe tax and do not pay by March 16, interest and failure-to-pay penalties begin accruing immediately.
The 5-year rule does not change in 2026. IRC §1374 remains in effect. The built-in gains tax rate remains 21%. If you converted from a C corp in 2022 or later, your recognition period is still running. Any asset sale, liquidation, or significant disposition before that five-year window closes should be analyzed for built-in gains exposure before the transaction closes — not after.
Related reading
- How to Avoid 40% Tax
- How to Legally Reduce Your Income With an S Corporation
- How Do I Know If My LLC Is an S Corp or Sole Proprietorship?
- Is It Better to Be an S Corp or a Sole Proprietor?
- Work with an S-Corp attorney
S-corp elections, reasonable salary determinations, and built-in gains exposure are exactly the kind of decisions that look simple until they aren't — and Delina works with founders and high earners who are done guessing.
If you're ready to understand whether your S-corp structure is actually protecting your tax savings or quietly creating liability, book a paid intake with Delina. This is not a free call. It is a focused, strategic session with an attorney who has read everything above and has specific opinions about your situation.
Ready to put this into practice? Tell us your situation.
Get Started →