What Are Tax Liabilities? Small Business Guide with Examples

"Tax liability" sounds like accountant-speak, but it just means the tax you owe. For a small business the tricky part isn't the definition — it's that you owe several different kinds of tax, to more than one authority, on different schedules. Miss one and the penalties add up fast. This guide breaks down every tax liability a US small business typically has, shows how to work yours out with a simple example, and explains how to pay and reduce it.

What is a tax liability?

A tax liability is the total amount of tax a person or business is legally obligated to pay to a taxing authority — the IRS federally, plus your state and sometimes your city or county. You create a liability whenever you earn income, make a sale, or run payroll; you clear it when you actually pay the tax.

A key distinction: some tax liabilities are your own (like income tax on your profit), while others are taxes you collect on someone else's behalf (like sales tax from customers or payroll tax withheld from employees). The second kind never really belongs to the business — you're holding it in trust and passing it to the government, which is why misusing it is treated so seriously.

What types of tax liabilities does a small business have?

Most small businesses deal with some combination of these five:

Tax	Who pays it & how much
Income tax	On business profit. Pass-through entities (sole proprietor, partnership, S corp, most LLCs) are taxed on the owner's return at individual rates; a C corp pays a flat 21% corporate rate
Self-employment tax	15.3% on net self-employment earnings — 12.4% Social Security (up to $184,500 in 2026) + 2.9% Medicare
Payroll tax	If you have employees: 7.65% FICA withheld from wages plus a matching 7.65% you pay, plus FUTA (6.0% on the first $7,000, usually 0.6% after state credit) and state unemployment
Sales tax	Collected from customers at the point of sale and remitted to the state — rates and rules vary by state
Excise tax	Only on specific goods and activities — fuel, tobacco, alcohol, certain transportation and more

Not every business has all five. A freelance designer might only face income tax and self-employment tax; a retail store adds sales tax and payroll; a fuel distributor adds excise. Knowing which apply to you is the first step to never being caught short.

How do you work out your tax liability?

For most owners, income tax and self-employment tax are the two big ones, and they both start from the same figure: your net profit (revenue minus allowable business expenses). Here's a simplified example for a sole proprietor:

Step	Amount
Business revenue	$90,000
Less business expenses	($30,000)
Net profit	$60,000
Self-employment tax (roughly 15.3% of net earnings)	~$8,478
Federal income tax (on profit, after deductions)	Varies by bracket

Self-employment tax is charged on roughly 92.35% of your net earnings, and you can deduct half of it when calculating your income tax — a detail that trips up a lot of first-time filers. Income tax is then layered on top at your marginal rate. To get a realistic estimate for your own numbers, our small business tax calculator does the heavy lifting.

How do tax liabilities appear on your balance sheet?

Tax you owe but haven't yet paid is a real debt, so it shows up on your balance sheet under current liabilities — alongside things like accounts payable. Common lines include income taxes payable, sales tax payable and payroll taxes payable.

Tracking these properly matters because that money isn't available to spend — the sales tax sitting in your account belongs to the state. If you're not sure how liabilities sit against your assets, our balance sheet example walks through the full layout. Larger businesses may also carry deferred tax, which reflects timing differences between accounting profit and taxable profit — but for most small businesses, current tax payable is the figure that counts.

How do you pay estimated quarterly taxes?

Employees have tax withheld from each paycheck. When you're self-employed or run a business, no one withholds for you — so the IRS expects you to pay as you go, in four estimated installments. You must make estimated payments if you expect to owe $1,000 or more for the year ($500 for corporations).

Quarter	Income period	Due date
Q1	Jan – Mar	April 15
Q2	Apr – May	June 15
Q3	Jun – Aug	September 15
Q4	Sep – Dec	January 15 (next year)

Underpay and the IRS charges an underpayment penalty, even if you settle the full amount by April. To stay ahead of the installments and avoid a nasty April surprise, use our quarterly tax calculator, and set aside tax money as it comes in rather than scrambling at each deadline.

How can you reduce your tax liability?

Reducing tax legitimately is about claiming everything you're entitled to and structuring the business sensibly. The main levers are:

• Claim every deductible expense — home office, mileage, equipment, software, professional fees and more
• Contribute to a retirement plan — a SEP-IRA or Solo 401(k) can shelter significant income
• Choose the right entity — an S corp election can cut self-employment tax for some owners
• Use tax credits — credits reduce tax dollar-for-dollar and are more valuable than deductions
• Time income and purchases — accelerating a deductible purchase into the current year can lower this year's bill

Every one of these has rules and trade-offs, and the right mix depends on your numbers. Our US tax services team can review your position and make sure you're not paying a dollar more than you owe.

Frequently asked questions

Related: our small business tax calculator, our US tax services, and our balance sheet example. Official guidance is on the IRS estimated taxes pages.