S-Corp vs LLC: Frequently Asked Questions

Most tax professionals recommend S-Corp election when your net business profit consistently exceeds $50,000–$60,000 per year. Below that threshold, the cost of running payroll (typically $900–$1,800/year) and filing an additional corporate tax return (Form 1120-S, typically $800–$2,000 with a CPA) tends to erase the savings from reduced self-employment taxes.

At higher income levels — $100,000, $150,000, $200,000 — the annual savings grow significantly, making S-Corp election increasingly worthwhile. Use our calculator to see exact estimates based on your numbers.

To have your S-Corp election take effect for the 2026 tax year, you must file IRS Form 2553 by March 15, 2027 (for calendar-year businesses that began the year as an LLC). If you're starting a new business, you have 75 days from the date the corporation or LLC was formed or began doing business.

If you missed the deadline, don't panic — the IRS has a late election relief procedure under Revenue Procedure 2013-30 that allows many late-filers to retroactively elect S-Corp status. A tax professional can help you determine if you qualify.

The IRS requires that S-Corp owner-employees pay themselves a salary comparable to what they'd pay someone else to do the same work. There is no exact formula, but the IRS looks at factors such as your role, qualifications, hours worked, the industry standard salary, and the ratio of salary to total distributions.

A common rule of thumb is to pay yourself at least 40–60% of your net profit as salary, with the remainder as distributions. For professionals with a clear market salary (physicians, attorneys, engineers), the salary should align with that market rate regardless of the percentage rule.

Paying yourself $1 or an obviously below-market salary is a major audit red flag. The IRS has won numerous court cases re-characterizing distributions as wages in these situations, resulting in large back tax and penalty bills.

California is the most notable exception to the general S-Corp rule. California recognizes the federal S-Corp election, but imposes two additional state-level taxes that other states don't have:

• A minimum annual franchise tax of $800 (applies whether or not your business makes a profit)
• A 1.5% S-Corp tax on net income (California doesn't fully exempt S-Corp income at the entity level)

Depending on your income level, these additional California taxes can significantly reduce or even eliminate your federal S-Corp savings. At $80,000 net profit, the California S-Corp tax alone adds roughly $1,200–$2,000 in additional state taxes. Run the full analysis with a California CPA before electing.

Yes. A single-member LLC can elect S-Corp tax treatment by filing IRS Form 2553. This is actually one of the most common setups for self-employed professionals and solo business owners. You remain the sole owner of your LLC with full liability protection, but the IRS treats the income as flowing through an S-Corp for tax purposes.

There is no requirement for an S-Corp to have multiple shareholders. The key requirements are: you must be a U.S. citizen or permanent resident, you must have 100 or fewer shareholders, and you can only have one class of stock/membership units.

IRS Form 2553 is the official "Election by a Small Business Corporation" form. It notifies the IRS that you want your corporation or LLC taxed as an S-Corporation under Subchapter S of the Internal Revenue Code.

To complete Form 2553, you'll need: your business name, address, and EIN; the requested effective date of the election; your tax year end date; the name and signature of all shareholders/members; and an explanation if you're making a late election.

You can mail or fax Form 2553 to the IRS — the correct address/fax number depends on your state (listed in the form instructions). The IRS typically sends written confirmation within 60 days. Keep this confirmation permanently.

Our calculator uses the following methodology for 2026:

• LLC scenario: Calculates self-employment tax on 92.35% of net profit using current SS wage base ($184,500) and Medicare rates, then estimates federal income tax after the half-SE deduction and 20% QBI deduction.
• S-Corp scenario: Calculates payroll taxes (employer + employee) on your chosen salary only, estimates distributions as remaining profit minus payroll admin costs, applies QBI deduction to distributions, then calculates federal income tax.
• Savings: The difference in total tax burden between scenarios.

The calculator intentionally simplifies: it uses federal tax only (no state income tax), applies QBI without income-based phase-outs, and doesn't account for additional deductions you may have. It is an estimate — not a precise tax projection.

The Qualified Business Income (QBI) deduction — created by the 2017 Tax Cuts and Jobs Act — allows eligible business owners to deduct up to 20% of their qualified business income from their taxable income. It is one of the most significant tax benefits for pass-through business owners.

Both LLC owners and S-Corp owners can typically claim the QBI deduction. However, for S-Corp owners, the deduction applies to the distribution portion of income (i.e., S-Corp net income), not to your W-2 salary. Salary is treated as wages and excluded from the QBI calculation.

Important limitation: the QBI deduction phases out entirely for "specified service trades or businesses" (SSTBs — which includes law, medicine, consulting, financial services, and several other professions) when income exceeds $197,300 (single) or $394,600 (married filing jointly) in 2026. If you're in an STBB and above these thresholds, you cannot claim the QBI deduction at all.

Technically, yes — the S-Corp election can be made to take effect on any date during the year, and in some cases can be retroactive to January 1 of the current year if filed before March 15. However, mid-year elections create a "short year" filing situation that adds accounting complexity.

The more common and clean approach is to make the election effective January 1 of the following year. If you realize mid-year that S-Corp makes sense for you, file Form 2553 as soon as possible with an effective date of January 1 of next year. This gives you time to set up payroll properly before it becomes legally required.

Yes, absolutely. Maintaining a separate business bank account is essential for any LLC or S-Corp — both as a legal requirement for preserving your liability protection and as a practical necessity for tracking business vs. personal finances.

For S-Corps specifically, the separation is even more important because the IRS will scrutinize the distinction between salary and distributions. Mingling business and personal funds makes it much harder to demonstrate that you're paying yourself a proper salary and taking the rest as distributions — which is the entire mechanism of S-Corp tax savings.

S-Corp operation adds several real costs that an LLC doesn't have:

• Payroll service: $900–$1,800/year (Gusto, ADP, Paychex, etc.)
• Form 1120-S preparation: $800–$2,500/year with a CPA (compared to $300–$700 for a Schedule C)
• State filing fees: Varies by state; some states charge additional S-Corp fees annually
• Bookkeeping: More complex books mean higher monthly bookkeeping costs if outsourced

Total additional annual cost typically ranges from $2,000–$5,000, depending on your location and the complexity of your business. At $100,000+ in net profit, the tax savings of $5,000–$10,000 typically more than justify these costs.

S-Corp owners pay taxes in two ways. First, federal income tax and employee payroll taxes are withheld from your W-2 salary via your payroll service — this happens automatically with each paycheck. Second, the pass-through income from distributions is reported on your personal return, and you need to make quarterly estimated tax payments to cover the income tax on that portion.

Quarterly estimated tax due dates are typically April 15, June 15, September 15, and January 15. Your CPA or tax software can help you calculate the right payment amounts to avoid underpayment penalties. Many S-Corp owners increase withholding on their salary to cover the distribution income, which simplifies the quarterly payment process.

Yes, and this is one of the most powerful additional tax benefits available to S-Corp owners. You can make both employee contributions and employer contributions to retirement accounts as an S-Corp owner-employee:

• Solo 401(k) employee contribution: Up to $24,500 (2026), or $32,500 if age 50+ — based on your W-2 salary
• Solo 401(k) employer contribution: Up to 25% of your W-2 salary — paid by the S-Corp as a business deduction
• SEP-IRA: Up to 25% of W-2 compensation — simpler to administer than a 401(k)

Combined with the S-Corp payroll tax savings, a high-income business owner making full 401(k) contributions through their S-Corp can reduce their total tax burden by $20,000–$40,000 or more annually. Consult with a financial advisor to optimize your retirement strategy alongside your S-Corp structure.

Our calculator estimates federal taxes only. It does not calculate state income taxes, and this is by design — state tax rules for S-Corps vary dramatically across all 50 states. Some states have no income tax (Texas, Florida, Nevada), others charge additional S-Corp fees (California, New York), and most fall somewhere in between.

The good news: state income taxes are generally the same under both LLC and S-Corp structures since both are pass-through entities for state tax purposes in most states. So while our calculator may underestimate your total absolute tax burden, the savings comparison it shows is still directionally accurate in most states.

California and New York are notable exceptions where the S-Corp structure incurs additional state costs that reduce your net savings.

Yes. S-Corp elections can be voluntarily revoked by the shareholders at any time. To revoke, a majority of shareholders must consent, and you file a statement of revocation with the IRS. The revocation typically takes effect on January 1 of the following year (or can be made effective on a specific date within the year in some cases).

One caution: once you revoke an S-Corp election, the IRS restricts you from making a new S-Corp election for the same corporation for five years, unless the IRS gives special consent. So revocation isn't a decision to make lightly — plan carefully with a CPA before withdrawing the election.

This is an important long-term consideration that many business owners overlook. Your Social Security retirement benefit is calculated based on your lifetime wage earnings — specifically your highest 35 years of indexed earnings subject to Social Security taxes.

As an LLC (sole proprietor), all of your net profit up to the Social Security wage base ($184,500 in 2026) counts toward your Social Security record. As an S-Corp owner, only your W-2 salary counts — distributions do not. If you pay yourself a relatively low salary to maximize tax savings, you may be reducing the Social Security earnings credit you accumulate each year.

For younger business owners with many working years ahead, this tradeoff is typically minor because Social Security benefits have a diminishing return formula — extra earnings above a threshold add relatively little to your eventual benefit. But for business owners approaching their 50s and 60s who care deeply about maximizing Social Security benefits, it is worth factoring into your salary decision. A financial planner familiar with both tax planning and retirement income can help you find the right balance.

If your S-Corp has a net loss for the year, that loss flows through to your personal tax return and can offset other income — similar to how LLC losses work. However, there is an important limitation: S-Corp losses are deductible only up to your basis in the S-Corp, which is generally the amount you've contributed to the business (your investment and loans to the company).

In a loss year, you still need to pay yourself a reasonable salary if the corporation has cash to do so. You cannot simply stop payroll because business is slow — if the S-Corp has enough money to pay you a reasonable wage, the IRS expects you to continue. However, if the business truly cannot afford payroll (genuinely zero cash available), that can be documented and may reduce or eliminate the salary requirement for that period. Talk to your CPA immediately if you anticipate a loss year as an S-Corp owner.

Yes. Many people operate an S-Corp for their side business while holding a regular W-2 job. There is no IRS rule against having both. Your W-2 employment income and your S-Corp income are reported separately on your personal tax return.

One thing to be aware of: Social Security taxes are capped at the annual wage base ($184,500 in 2026), and this cap applies across all employment. If your W-2 wages from your employer already exceed $184,500, you've already paid the maximum Social Security tax for the year — and the S-Corp's salary will have no additional Social Security cost (only Medicare). This can slightly affect the savings calculation compared to someone with no W-2 job. The S-Corp calculator above does not account for other W-2 income, so if this applies to you, consult a CPA for a precise estimate.

Schedule K-1 (Form 1120-S) is the document your S-Corp issues to each shareholder at the end of the tax year, showing that person's share of the corporation's income, deductions, and credits. If you are the sole owner of your S-Corp, you receive one K-1 showing 100% of the S-Corp's pass-through items.

You (or your tax software/CPA) use the K-1 to complete your personal tax return (Form 1040). The ordinary business income on the K-1 is entered on Schedule E, Part II, and flows into your total taxable income. This is separate from your W-2 wages, which are reported on the wages line of Form 1040. Your CPA or tax software handles this automatically — but it's helpful to understand what the K-1 represents so you don't confuse it with other income documents.

K-1s from S-Corps are typically issued by March 15 (the S-Corp filing deadline), which is why many S-Corp owners need to file a personal tax extension if their K-1 arrives late.

This is a practical concern that doesn't get discussed enough. When you apply for a personal mortgage as an S-Corp owner, lenders typically look at your personal income, which means your W-2 salary plus the income reported on your K-1. This is usually fine — mortgage underwriters are accustomed to S-Corp owners and have clear guidelines for documenting self-employed income.

However, if you've been aggressively reducing your taxable income through deductions and retirement contributions, your documented income for mortgage purposes may be lower than your actual cash flow — potentially affecting your loan qualification. Lenders typically require 2 years of tax returns and may add back certain non-cash deductions to calculate qualifying income. If you're planning to apply for a mortgage in the next 1–2 years, discuss this with both your CPA and a mortgage professional before making major changes to your income structure.