S Corp Tax Calculator

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Frequently Asked Questions

How is an S Corp taxed?

An S Corporation is a pass-through entity - the corporation itself generally does not pay federal income tax. Instead, profits and losses pass through to shareholders' personal tax returns. Shareholders pay tax at their individual rates on their share of S Corp income.

What is the S Corp reasonable salary requirement?

S Corp shareholder-employees must pay themselves a "reasonable salary" for services performed. The salary must be commensurate with industry standards and job duties. Below-market salaries to avoid payroll taxes are a red flag for IRS audits.

How does an S Corp save on self-employment tax?

Unlike LLCs/sole proprietors, S Corp shareholders pay payroll taxes (Social Security + Medicare) only on their salary, not on distributions. If salary is $60,000 and distributions are $40,000, SE tax savings = $40,000 � 15.3% = $6,120.

What is the S Corp tax rate?

S Corps do not pay entity-level federal income tax (except for certain built-in gains tax). Shareholders pay tax at their individual rates (10-37%). The corporate tax rate for S Corps is 0% at the federal level, though some states impose entity-level taxes.

How do S Corp distributions work?

S Corp distributions are payments to shareholders from accumulated profits. They are not subject to payroll tax (unlike salary) but reduce the shareholder's basis. Distributions beyond basis are taxed as capital gains. Distributions are reported on Schedule K-1.

What is the S Corp deadline for filing?

S Corps file Form 1120-S by March 15 (or September 15 with extension). Schedule K-1s must be provided to shareholders by March 15. Late filing penalties are $220 per shareholder per month for up to 12 months.

What is the S Corp built-in gains tax?

If an S Corp was formerly a C Corp, it may owe built-in gains tax (21%) on the appreciation of assets sold within 5 years of conversion. The tax applies to the lesser of the built-in gain or the taxable income of the S Corp.

Can an S Corp have only one shareholder?

Yes, S Corps can have 1 to 100 shareholders. Single-owner S Corps are common. The sole shareholder must still take a reasonable salary and file Form 1120-S annually.

What is the difference between an S Corp and a C Corp?

S Corps: pass-through taxation (no entity-level tax), limited to 100 US individuals/shareholders, one class of stock. C Corps: taxed at entity level (21%), unlimited shareholders, multiple classes of stock, earnings subject to double taxation.

How does an S Corp handle losses?

S Corp losses pass through to shareholders and can offset other income, subject to: basis rules (loss limited to the shareholder's stock basis and debt basis), at-risk rules, and passive activity loss rules. Suspended losses carry forward.

What is the S Corp Form 1120-S filing requirement?

Form 1120-S (US Income Tax Return for an S Corporation) reports income, deductions, credits, and shareholder information. The return must include Schedule K-1 (shareholder share of income) and balance sheet. It is due March 15.

What is the health insurance deduction for S Corp shareholders?

S Corp shareholders who own more than 2% of the corporation can deduct health insurance premiums paid by the corporation. The premiums are included in the shareholder's W-2 wages but then deducted as an adjustment to income.

How does an S Corp pay its shareholders?

Shareholders receive W-2 wages (salary subject to payroll tax) and/or distributions (from profits, not subject to payroll tax). The split between salary and distributions must be reasonable. The IRS focuses on S Corps with low salary-to-distribution ratios.

What is the maximum number of S Corp shareholders?

S Corps are limited to 100 shareholders. Spouses and certain family members count as one shareholder. All shareholders must be US citizens or residents (not nonresident aliens). Only individuals, estates, and certain trusts can be shareholders.

What is the S Corp late election relief?

If you missed the S Corp election deadline (March 15 or within 2 months and 15 days of the tax year), you can request late election relief using Form 2553 with a reasonable cause explanation. The IRS generally grants relief if the request is made within 3 years and 75 days.

Can an S Corp have different classes of stock?

No, S Corps can have only one class of stock. However, differences in voting rights are permitted (voting vs. non-voting shares). All shares must have identical economic rights to distributions and liquidation proceeds.

What is the S Corp tax on passive income?

If an S Corp has accumulated earnings from prior C Corp years and passive investment income exceeds 25% of gross receipts for 3 consecutive years, it may be subject to a tax (highest corporate rate) on excess passive income. This can trigger S Corp termination.

How does an S Corp handle vehicle expenses?

S Corps can deduct vehicle expenses for business use. Shareholder-employees using personal vehicles for business can be reimbursed at the IRS standard mileage rate (67�/mi for 2024) tax-free. The S Corp deducts the reimbursement as a business expense.

What is the S Corp retirement plan contribution?

S Corps can sponsor retirement plans (401k, SEP IRA, SIMPLE IRA) for employees including shareholder-employees. Contributions are deductible by the corporation. For 2024, 401k elective deferrals are $23,000 ($30,500 with catch-up for 50+), plus employer contributions up to $69,000 total.

What is the difference between S Corp and Sole Proprietorship?

S Corp: separate legal entity, payroll taxes only on salary, liability protection, more paperwork, Form 1120-S required. Sole Proprietorship: no separate entity, self-employment tax on all profits, simpler setup, Schedule C filed with personal return, no liability protection.

What is the S Corp shareholder basis?

Shareholder basis represents the amount a shareholder has invested in the S Corp. Basis is increased by contributions and income, decreased by distributions and losses. Loss deductions are limited to basis. Basis tracking is critical for tax compliance.

How does an S Corp liquidate?

When an S Corp liquidates, it distributes assets to shareholders in exchange for their stock. The corporation recognizes gain or loss on distributed assets. Shareholders recognize gain or loss on the difference between FMV of assets received and their stock basis.

What are the S Corp state tax differences?

Some states (CA, NY, IL, MA) impose entity-level taxes on S Corps or recognize them differently. CA: 1.5% franchise tax on net income (minimum $800). NY: 6.5% on certain income over $40,000. Other states do not recognize S Corp status and tax as C Corps.

Can an S Corp have a fiscal year?

Most S Corps must use a calendar year (December 31 year-end). However, certain S Corps can elect a fiscal year if they can show a business purpose (natural business year) or make a Section 444 election with required tax deferral payments.

What is the QBI deduction for S Corp shareholders?

S Corp shareholders may qualify for the 20% QBI deduction under Section 199A. The deduction phases out for SSTBs above $191,950 (single) / $383,900 (MFJ) taxable income for 2024. W-2 wages paid by the S Corp factor into the wage limit.

What forms does an S Corp need to file?

Federal: Form 1120-S (annual return), Schedule K-1 (shareholder statement), Form 2553 (election), quarterly payroll reports (941), W-2/W-3 (wages), state returns as required. Annual filings include information returns (1099, if applicable).

How does an S Corp issue stock?

S Corps issue stock to shareholders representing ownership. Stock can be voting or non-voting. The initial issuance is tax-free to the extent it does not exceed the value of contributed assets. Stock basis equals the amount paid or fair value of contributed property.

What happens to S Corp debt on liquidation?

On liquidation, S Corp debt is paid before distributions to shareholders. Shareholders who have previously taken distributions beyond their basis may have negative basis or recognize capital gain upon liquidation. Any discharged debt may be taxable income.

Can an S Corp deduct startup costs?

Yes, S Corps can deduct up to $5,000 in organizational costs in the first year (with remainder amortized over 180 months). Start-up costs (marketing, research, etc.) also up to $5,000 with 180-month amortization. Phase-out applies when costs exceed $50,000.

What is the penalty for not filing Form 1120-S?

The penalty is $220 per shareholder per month (up to 12 months) for late filing. Additional penalties: failure to provide K-1 ($290 per statement), late payment (0.5% per month up to 25%), and accuracy-related (20%).