Profit Margin Calculator for US Businesses

Last reviewed: 17 May 2026

Calculate US gross, operating, and net profit margins with IRS federal corporate tax (21%) pre-filled. Free, browser-based, dollar-ready.

Profit margin equals profit divided by revenue. Gross margin uses cost of goods sold; net margin subtracts all costs and tax. A healthy small-business net margin is ten percent.

A US profit margin calculator computes gross, operating, and net margin after COGS, operating expenses, and federal corporate tax (21% flat for C-corps under TCJA), plus state taxes ranging from 0% (NV, TX, FL) to 11.5% (NJ). IRS Form 1120 and Publication 535 are the authoritative references.

US profit margin math has two complications absent in most other markets: the federal-plus-state tax stack, and pass-through versus C-corp treatment.

For C-corps, the federal rate is a flat 21% post-TCJA. State rates range from 0% (Nevada, Texas, Washington — Texas has a separate franchise tax) to 11.5% (New Jersey), so the blended rate depends on nexus. The calculator lets you set an effective combined rate so net margin output reflects what actually hits retained earnings.

For pass-through entities (S-corp, LLC, partnership, sole prop), the entity pays no federal income tax — profit flows to the personal 1040 and is taxed at marginal rates from 10% to 37%, plus 15.3% self-employment tax on the first $184,500 of SE income (2026 Social Security wage base) and 2.9% Medicare above (with an additional 0.9% above $200k). Net margin for pass-throughs is conventionally calculated pre-personal-tax.

COGS under US GAAP includes direct materials, direct labor, and manufacturing overhead. Section 263A (UNICAP) rules force resellers and manufacturers with average receipts above $32M (2026 threshold) to capitalize more indirect costs into inventory.

Net-margin benchmarks (IRS Statistics of Income and NYU Stern industry tables): - Software / SaaS: 15-25% - Professional services: 10-20% - Retail (non-grocery): 2-5% - Restaurants: 3-9% - Construction: 5-10%

The single biggest US-specific lever past $1M revenue is electing S-corp status (if eligible) to escape SE tax on a reasonable-salary versus distribution split — you can model this by re-running the calculator with each entity's effective tax rate. For underlying rules, IRS Publication 535, Form 1120 instructions, and the Schedule SE instructions are authoritative.

Worked example

US C-corp example — combined federal and state tax.

A Florida ecommerce C-corp reports $900,000 in revenue. COGS — landed product cost, inbound freight, and payment processing — totals $540,000. Operating expenses (salaries, ad spend, software, 3PL fulfilment) run $250,000. Because Florida has no corporate income tax, the Tax Rate field holds just the 21% federal rate.

Gross margin: (900,000 − 540,000) ÷ 900,000 = 40%.
Operating profit: 360,000 − 250,000 = $110,000, an operating margin of about 12.2%.
Net profit after 21% tax: 110,000 × 0.79 = $86,900, a net margin of roughly 9.7%.

That 9.7% net is solid for retail (the IRS benchmark is 2-5%) but only middling for a software business. A C-corp with nexus in New Jersey would enter ~32.5% combined and watch net margin fall by several points on the same revenue.

See the formula

See parent calculator at /profit-margin-calculator for the full formula reference.

Frequently Asked Questions

What tax rate should I enter for a US C-corp versus a pass-through?

For a C-corp, enter your combined rate: the flat 21% federal rate plus your state rate, which ranges from 0% (Nevada, Texas, Florida) to 11.5% (New Jersey). For a pass-through (S-corp, LLC, partnership, sole prop), the entity itself pays no federal income tax, so net margin is conventionally calculated pre-personal-tax — many owners enter 0% or just their state rate.

How do I handle state corporate tax in the single Tax Rate field?

Blend federal and state into one effective rate and type that in. A C-corp with nexus in a 6% state enters roughly 27% (21% federal + 6% state); a Texas C-corp enters 21% since Texas levies a separate franchise tax rather than income tax. The field is editable precisely so your net margin reflects what actually hits retained earnings after both layers.

Where do self-employment taxes go for a pass-through entity?

This calculator stops at the entity level, so the 15.3% SE tax on the first $184,500 of SE income isn't a separate output. SE tax is a personal-return cost, not a company expense, so leave it out of COGS and OpEx. Use the pre-personal-tax net margin here, then model SE tax separately on your 1040.

What net margin should a US business be aiming for?

It varies by sector. Per IRS Statistics of Income and NYU Stern tables: software/SaaS runs 15-25%, professional services 10-20%, non-grocery retail just 2-5%, restaurants 3-9%, and construction 5-10%. Benchmark your net output against your own industry rather than a single universal target, because a great retail margin would be a poor SaaS one.

Related calculators

Profit Margin Calculator

Calculate gross and net profit margin instantly.

Open →

Methodology & sources

Rates last verified: May 2026

Read the full methodology →

Tax rate defaults reflect each region's headline corporate tax rate. Override the rate if your effective rate differs (e.g. UK small profits rate, US state tax additions).

Primary sources

Rates are reviewed annually or when a region changes its headline rate. If you spot one that's out of date, email [email protected].

For information only. This calculator does not constitute financial, accounting, or tax advice. Consult a qualified professional before making business decisions.

Try these scenarios

Pre-filled examples — click any chip to load the inputs and result.

How to calculate profit margin

Pick your regionToggle USA, UK, or South Africa to load the right currency symbol and pre-fill the corporate tax rate.
Enter total revenueType your sales or revenue for the period in the Revenue field.
Enter cost of goods sold (COGS)Add the direct costs to produce or buy what you sold.
Add operating expenses (optional)Add rent, salaries, marketing, and overhead to unlock the operating margin result.
Read your margin tierGross, operating, and net margin display with color-coded interpretation — green is healthy, amber is caution, red needs action.

Found this calculator useful?

Save it to a Pinterest board for later, or share with your team.

Save to Pinterest

Written by

James Blanckenberg

Founder, BusCalcTools

Founder of BusCalcTools and FinnCalc. Builds practical financial calculators for small business owners and freelancers across the US, UK, and South Africa.

Editorial review by: James Blanckenberg, Founder & Editor

More about James →