LLC Tax Election Comparison Calculator

The calculator builds three current-year federal scenarios from the same owner-level profit. The default LLC path treats active owner profit as self-employment income, estimates the deductible half of self-employment tax, applies a simplified QBI deduction, and then calculates federal income tax after the standard deduction.

The S-corp path replaces self-employment tax on all active owner profit with employee and employer payroll tax on the entered owner W-2 salary. Remaining pass-through profit is modeled as S-corp K-1 income, with QBI estimated from pass-through profit, W-2 wages, UBIA, SSTB status, and the taxable income cap.

The C-corp path models owner W-2 salary, employer payroll tax, a 21% federal corporate tax layer on remaining corporate profit, and a shareholder dividend tax layer when after-tax corporate profit is distributed. C corporation income is not treated as QBI.

Start with the default LLC classification

An LLC is a state-law entity, but federal tax classification depends on the number of owners and elections made. A single-member LLC is commonly disregarded for federal income tax unless it elects corporate treatment. A multi-member LLC is commonly treated as a partnership unless it elects corporate treatment. That default path is often simple and flexible, but active owner business profit can be exposed to self-employment tax.

This calculator uses owner-attributable profit as the starting point. For a single-owner business, that usually means total LLC profit before election-specific costs. For a multi-owner business, use the profit share that belongs to the modeled owner and then separately review operating agreement allocations, guaranteed payments, and K-1 reporting with an advisor.

Where S-corp savings usually come from

The S-corp election is often attractive because pass-through profit after reasonable owner wages is generally not subject to self-employment tax. That does not make all distributions tax-free. The owner still pays federal income tax on wages and pass-through profit, the corporation must run payroll, and the business must pay employer payroll tax and filing costs.

The calculator compares the S-corp result against default LLC treatment by modeling owner W-2 wages, employee Social Security and Medicare tax, employer Social Security and Medicare tax, optional state payroll tax, annual admin cost, and pass-through QBI. The S-corp scenario becomes stronger when profit remains after a supportable salary and weaker when salary, payroll cost, and compliance costs consume most of the profit.

Reasonable compensation is the S-corp pressure point

The IRS focuses on whether S corporation shareholder-employees receive reasonable compensation for services before distributions are paid. A low W-2 salary can make the spreadsheet look better while increasing audit risk. That is why this calculator asks for both the planned salary and a reasonable salary benchmark.

Use evidence, not a percentage shortcut. Relevant support may include comparable pay for similar work, the owner's time commitment, role, training, responsibilities, business revenue, profit, and what the business pays non-owner employees. If the modeled distribution exists only because salary is understated, the election may not be as strong as the headline savings number suggests.

QBI can change the answer

Default LLC profit and S-corp pass-through profit can be eligible for the Section 199A QBI deduction, subject to taxable income, specified service trade or business status, W-2 wages, UBIA of qualified property, and the taxable-income-minus-net-capital-gain cap. A C corporation does not produce QBI for the shareholder.

Because QBI is sensitive to taxable income, the election with lower payroll tax is not always the election with the lowest combined federal tax. Use the QBI 20% deduction calculator when you need a deeper Section 199A worksheet with REIT, PTP, cooperative, and carryforward details.

Why C-corp elections need a different lens

The C-corp model can look competitive when profits are retained instead of distributed, because shareholder dividend tax is delayed. That deferral is not the same as permanent savings. Future dividends, stock sale treatment, accumulated earnings issues, personal holding company rules, state corporate taxes, and exit planning can all change the long-term result.

C-corp treatment may still make sense for businesses seeking outside investors, reinvestment, certain fringe benefits, or a specific acquisition path. For many owner-operated service businesses, however, the double tax and lost QBI deduction can outweigh the lower entity-level corporate rate.

What this calculator does not decide

The calculator does not file Form 8832, file Form 2553, check S-corp eligibility, model state income taxes, calculate retirement-plan design, test shareholder basis, or replace entity legal advice. It also does not decide whether a late election can be accepted. Use it to narrow the financial question, then confirm the filing mechanics, due dates, payroll setup, shareholder agreements, and state rules before changing the LLC's tax classification.

For adjacent planning, estimate current business profit with the Schedule C profit and tax reserve calculator, check baseline SE tax with the self-employment tax calculator, and then update estimated tax payments with the quarterly tax payment calculator for freelancers.

Keep the research moving with QBI 20% Deduction Calculator, Schedule C Profit and Tax Reserve Calculator, Self-Employment Tax Calculator, and Quarterly Tax Payment Calculator for Freelancers.