S-Corp vs. LLC Tax Comparison

The reasonable salary requirement is the linchpin of the entire S-Corp tax strategy, and getting it wrong can trigger an IRS audit or reclassification of your distributions as wages (with back taxes, penalties, and interest).

The IRS does not provide a specific formula, but they look at several factors:

• Training and experience — What would someone with your qualifications, education, and years of experience earn as a W-2 employee doing the same job?
• Duties and responsibilities — What tasks do you actually perform for the business? If you are the CEO, marketer, accountant, and janitor, your salary should reflect the combined value of all those roles.
• Time and effort — If you work 60 hours a week in the business, a $30K salary is not reasonable. If you work 10 hours a week because the business is mostly automated, a lower salary is more defensible.
• Comparable salaries — Look at Bureau of Labor Statistics data, salary surveys (Glassdoor, PayScale), and job postings for similar roles in your geographic area.
• Company revenues and profits — A solo consultant generating $500K should be paying a higher salary than one generating $80K, even if the work is similar.

Rules of thumb used by CPAs:

• Many CPAs suggest setting salary at 40–60% of net business income as a starting point, then adjusting based on the factors above.
• The IRS has won court cases where owners paid themselves less than $25,000 on six-figure incomes, so staying above a reasonable floor is important.
• Document your reasoning. If audited, being able to show comparable salary data and a written justification is your best defense.

Bottom line: When in doubt, err on the side of a slightly higher salary. The small amount of extra payroll tax is cheap insurance compared to the cost of an IRS reclassification.

The Qualified Business Income (QBI) deduction, also known as the Section 199A deduction, allows eligible self-employed individuals and pass-through business owners to deduct up to 20% of their qualified business income from their taxable income. It was introduced by the Tax Cuts and Jobs Act of 2017 and is currently set to expire after 2025 (though it may be extended).

How QBI applies to sole proprietors:

• As a sole proprietor, your entire net business income (after the SE tax deduction) is generally eligible for the 20% QBI deduction, subject to income limits.
• For 2024, the full deduction is available if taxable income is below $191,950 (single) or $383,900 (married filing jointly). Above those thresholds, the deduction phases out based on W-2 wages and property limitations.

How QBI applies to S-Corp owners:

• With an S-Corp, only the distribution portion (pass-through income) qualifies for the QBI deduction. The W-2 salary you pay yourself does not count as QBI.
• This means the QBI deduction is smaller with an S-Corp because your eligible income is reduced by the salary amount.
• However, for high-income taxpayers subject to the W-2 wages limitation, the S-Corp's W-2 wages (including your own salary) can actually increase the allowable QBI deduction by satisfying the wage test.

The tradeoff: The S-Corp gives you SE tax savings but a smaller QBI deduction. The calculator above accounts for both sides of this equation to show you the true net savings. For most business owners under the income threshold, the SE tax savings substantially outweigh the reduced QBI deduction.

There is no single universal break-even number because it depends on your filing status, state taxes, reasonable salary, and other income. However, there are some widely cited benchmarks.

General guidelines:

• Below $40,000 net income: Almost never worth it. The SE tax savings are too small to offset the additional costs of payroll, filing Form 1120-S, and maintaining S-Corp compliance.
• $40,000–$60,000 net income: The gray zone. It might save you a small amount, but the administrative hassle may not be worth it. Run the numbers with this calculator.
• $60,000–$100,000 net income: Usually worth considering. With a reasonable salary of $40,000–$50,000, the SE tax savings start to meaningfully exceed the extra costs.
• Above $100,000 net income: Almost always beneficial. The SE tax savings can be $5,000–$15,000+ per year depending on how much you can pay as distributions.

Factors that move the break-even point:

• Lower reasonable salary → More distributions → More SE tax saved → Lower break-even. But the salary must be genuinely reasonable.
• Higher S-Corp costs → Higher break-even. If you use a full-service accounting firm that charges $3,000+ for 1120-S prep, that eats into savings.
• State taxes → Some states have additional S-Corp franchise taxes or minimum taxes that reduce the benefit (California charges a $800 minimum franchise tax plus 1.5% on income, for example).
• Income consistency → If your income fluctuates wildly year to year, you might only benefit in good years while still paying the fixed S-Corp costs in bad years.

Use this calculator with your actual numbers to find your specific break-even. The generic rules of thumb are a starting point, not a substitute for running the math.

The tax savings from an S-Corp are real, but they come with real costs and administrative obligations that sole proprietors do not have. Before electing S-Corp status, make sure you understand the full picture.

Recurring financial costs:

• Payroll service — $500–$1,500/year for services like Gusto, ADP, or similar. You must run payroll regularly (at minimum monthly, most do biweekly or semi-monthly).
• Tax preparation — Filing Form 1120-S is more complex than Schedule C. Expect to pay $500–$2,000+ for professional preparation.
• State fees — Many states charge annual franchise taxes, registered agent fees, or minimum taxes on S-Corps. California charges an $800 minimum franchise tax regardless of income.
• Accounting — You may need more sophisticated bookkeeping to properly track salary vs. distributions, shareholder basis, and officer compensation.

Compliance requirements:

• Form 2553 — Filed to elect S-Corp status. Must be filed by March 15 for the election to apply to the current tax year (or within 75 days of formation for new entities).
• Form 1120-S — Annual S-Corp tax return, due March 15 (with extension to September 15).
• Schedule K-1 — Issued to each shareholder showing their share of income, deductions, and credits.
• Quarterly payroll filings — Form 941 filed every quarter for payroll taxes.
• W-2 and W-3 — Filed annually for the owner-employee's salary.
• State payroll tax registrations — You may need to register as an employer with your state.

Bottom line: Budget at least $1,500–$3,000 per year in additional costs. This calculator uses a conservative $2,000 estimate. If your SE tax savings are only $2,500, the real net benefit might be just $500 — probably not worth the headache.

Yes, you can switch to S-Corp status, but the timing matters. The process involves filing IRS Form 2553, and there are specific deadlines you need to meet.

Timing options:

• Prospective election (beginning of tax year): File Form 2553 by March 15 of the year you want the election to take effect. For example, file by March 15, 2025 to be treated as an S-Corp starting January 1, 2025.
• New entity election: If you just formed your LLC, you have 75 days from formation to file Form 2553 for it to apply to the first tax year.
• Late election relief: If you missed the March 15 deadline, the IRS offers late election relief under Revenue Procedure 2013-30. You must file within 3 years and 75 days of the intended effective date and meet certain requirements.

Steps to make the election:

• Step 1: Make sure you have an LLC (or corporation) already formed with your state. You cannot elect S-Corp status for a sole proprietorship without an underlying entity — you first need to form an LLC.
• Step 2: Obtain an EIN (Employer Identification Number) if you do not already have one.
• Step 3: File Form 2553 with the IRS. All shareholders must sign. For a single-member LLC, that is just you.
• Step 4: Set up payroll for yourself effective from the S-Corp start date. You must start paying yourself a reasonable salary from day one of the election.
• Step 5: Begin keeping proper records — separate salary payments from distribution payments, track shareholder basis, and maintain meeting minutes if required by your state.

Important: Once you elect S-Corp status, you generally cannot revoke it for 5 years without IRS consent. Make sure the numbers work before committing, and consult a CPA or tax professional who can review your specific situation.

The Social Security wage base is the maximum amount of earnings subject to the Social Security portion of FICA tax. For 2024, this cap is $168,600. Earnings above this threshold are only subject to the 2.9% Medicare tax (plus the 0.9% Additional Medicare Tax for high earners), not the 12.4% Social Security tax.

Impact on sole proprietors:

• If your net SE earnings (92.35% of net income) exceed the wage base, you only pay the 12.4% Social Security portion on the first $168,600. Everything above that is only subject to 2.9% Medicare.
• This means the marginal SE tax rate drops from 15.3% to 2.9% once you pass the wage base. For very high earners, the SE tax "penalty" on additional income is much smaller.

Impact on S-Corp savings:

• For business owners earning well above the wage base, the S-Corp election provides less incremental benefit on the income above $168,600 because that income would only face 2.9% SE tax as a sole proprietor anyway.
• The biggest S-Corp savings come from the income between your reasonable salary and the wage base, where you avoid the full 15.3% SE tax rate.
• If your reasonable salary is already above the wage base (say, $200K salary on $400K income), the savings only come from avoiding the 2.9% Medicare tax on distributions — still meaningful at high income levels, but less dramatic per dollar.

Key takeaway: The S-Corp election saves the most money — in percentage terms — for business owners earning between $60K and $200K. Above $200K, it still saves significant dollars, but the per-dollar savings rate decreases because you would have already passed the Social Security wage base as a sole proprietor.

Setting your S-Corp salary artificially low to maximize distributions is the most common abuse the IRS looks for in S-Corp audits, and the consequences can be severe.

What happens if the IRS reclassifies your distributions:

• The IRS can reclassify all or part of your distributions as wages subject to employment taxes.
• You will owe the employee and employer portion of FICA taxes on the reclassified amount (15.3%), plus penalties and interest.
• The Trust Fund Recovery Penalty may apply, which makes you personally liable for the unpaid employment taxes.
• Late deposit penalties on employment taxes can add 2% to 15% depending on how late the taxes are.
• Accuracy-related penalties of 20% of the underpayment may also apply.

Red flags that trigger audits:

• Zero salary — Taking only distributions with no W-2 is the biggest red flag.
• Salary below industry norms — A software engineer running a consulting firm taking a $25K salary on $200K of income will raise eyebrows.
• Large disparity — Distribution-to-salary ratios above 3:1 or 4:1 attract attention, especially for service businesses.
• Prior audit history — Once flagged, your returns may receive extra scrutiny in future years.

Defensive strategies: Keep documentation of comparable salaries from the BLS, salary surveys, and job postings. Have your CPA sign off on the salary amount. Some S-Corp owners use a formal "reasonable compensation study" prepared by a third party, which costs $500–$2,000 but provides strong audit protection.

Yes, and this is an important but often overlooked tradeoff. Your future Social Security benefits are calculated based on your highest 35 years of earnings that were subject to Social Security taxes (FICA). By reducing your FICA-taxable earnings through the S-Corp election, you may be reducing your future benefits.

How Social Security benefits are calculated:

• The SSA takes your highest 35 years of inflation-adjusted earnings and averages them to get your Average Indexed Monthly Earnings (AIME).
• A formula with "bend points" converts AIME into your Primary Insurance Amount (PIA), which is your monthly benefit at full retirement age.
• Only earnings subject to Social Security tax count. As a sole proprietor, all your net SE earnings (up to the wage base) count. As an S-Corp, only your W-2 salary counts.

The practical impact:

• If you are in your peak earning years and already have 35 years of strong earnings, the impact on benefits is minimal because lowering a few years at the top does not change the average much.
• If you are early in your career or have years of low or zero earnings in your record, reducing FICA-taxable income could meaningfully lower your benefits.
• The Social Security benefit formula is progressive — you get more benefit per dollar at lower income levels (90% replacement on the first $1,174/month of AIME, 32% on the next tier, 15% above that). So the dollars you are cutting are replaced at the lower 15% or 32% rate, not the 90% rate.

The math usually still favors the S-Corp: Even in a worst-case scenario, the present value of reduced Social Security benefits is typically far less than the present value of years of SE tax savings. You can invest the tax savings yourself and likely come out ahead. But run the numbers for your specific situation, especially if you are young and do not yet have 35 years of earnings history.

This calculator uses simplified flat effective state tax rates to provide a reasonable estimate of the state tax impact. In reality, most states have progressive brackets, deductions, and credits that make the actual calculation more complex.

Important state-specific S-Corp considerations:

• California — Charges an $800 minimum franchise tax on LLCs and S-Corps, plus a 1.5% tax on S-Corp net income. This is a significant additional cost that reduces S-Corp savings.
• New York City — Has a separate Unincorporated Business Tax (UBT) of ~4% on sole proprietors, but S-Corps are exempt. This can actually make the S-Corp more attractive in NYC.
• States with no income tax (TX, FL, WA, NV, SD, WY, AK, TN, NH) — The S-Corp decision is purely about federal SE tax savings, simplifying the analysis.
• PTET (Pass-Through Entity Tax) — Many states now offer an optional pass-through entity tax election that allows S-Corps to pay state tax at the entity level, creating a workaround for the $10,000 SALT deduction cap. This can provide additional savings not captured in this calculator.
• Composite filing states — Some states require S-Corps to withhold and remit state taxes on behalf of shareholders, adding another compliance layer.

For accurate state-specific calculations, consult a CPA licensed in your state. This calculator provides a solid federal analysis and a reasonable state estimate, but state tax law is complex and varies significantly.