Small Business Tax Guide For Beginners and New Owners

There's a lot to do when starting a new business. Focusing on strategy, funding, hiring, and pricing is important, but it leaves little time for taxes, which is a misstep you'll want to avoid. Setting up your accounting and bookkeeping systems properly from day one ensures clean data you can rely on to make long-term business decisions, and it's not as hard as you might expect.

New business owners, freelancers, and first-time entrepreneurs can use this guide for a step-by-step path from choosing your business structure to filing on time.

Beginner’s Guide to Small Business Taxes

Step 1: Sort Out Your Small Business Structure

Your entity type determines how you should calculate and pay small business taxes. Federal tax laws require different filings and taxes for each structure.

Review these business entity descriptions to determine your tax return requirements.

Sole Proprietorships

A sole proprietorship is the default entity type for a small business owned by an individual or married couple. You don’t need to file paperwork to set up a sole proprietorship. If you’re self-employed, you’re automatically a sole proprietor.

Federal income tax laws treat sole proprietorships as one with the owner, meaning the business does not file a separate tax return. Instead, the owner must report their business income and deductions on their personal income tax return.

C Corporations

C corporations represent legal entities separate from their owners. C corps must file corporate tax returns to report their business activity and tax liability. C corporations pay tax on business income, and the business owners then pay taxes on corporate dividends. This is called double taxation.

You can establish a C corp by registering the business with your Secretary of State and obtaining an EIN.

S Corporations

Like C corps, S corporations are independent legal entities that must file S corp tax returns. However, S corps represent pass-through entities, which means they do not pay federal income tax. The business owners pay individual income tax on their share of business income.

Partnerships

Partnerships represent pass-through entities with two or more owners. Partnerships must file business tax returns to report income and ownership information. The business owners pay individual income tax on their share of business income.

LLCs

A limited liability company is a pass-through entity that distributes income and deductions to its business owners. Establishing an LLC requires filing a registration with your Secretary of State.

LLCs can have one or more owners. The number of owners determines the federal tax treatment of the business:

• Single-member LLCs have a single owner and default to sole proprietorship tax treatment.

• Multi-member LLCs have two or more owners and default to partnership tax treatment.

If you’re still deciding on the best business structure, consider partnering with professional CPAs for advice on entity formation. 1-800Accountant also offers a budget-friendly EIN registration service to support your small business setup.

Step 2: Get Your Bookkeeping in Order

Support your small business tax compliance with timely, accurate bookkeeping. Creating a dedicated business bank account is one of the most impactful steps you can take, as it helps maintain clean financials while promoting efficiency. And don't forget to open a dedicated business credit card. Bookkeeping software (QuickBooks Online, Wave, ClientBooks) makes it easier to track profitability and prepare for tax season. While spreadsheets or software help, they're not a replacement for professional bookkeeping support.

Bookkeeping professionals perform functions including:

• Record and categorize transactions: Track receipts and business expenses to monitor cash flow and spending.

• Perform account reconciliations: Ensure accurate records and account balances to support your accounting and budgeting.

• Prepare financial statements: Summarize your quarterly or annual financial activities for debt financing and a smooth tax return process.

Consider outsourcing your bookkeeping to professionals. 1-800Accountant offers affordable services to help you maintain organized, accurate accounting.

Step 3: Calculate Your Small Business Taxes

Depending on your location and operations, your small business may need to pay multiple business taxes. This list will help you determine which taxes you should pay and how much you’ll owe.

Federal Income Tax Rates

Every small business must pay federal income tax on its income. Your federal tax rate depends on your business entity structure.

• C corporations pay a 21% federal income tax on net taxable income.

• Sole proprietorships and pass-through entities distribute earnings to their owners. Business owners pay tax at their individual income tax rates. Review the IRS 2026 federal tax brackets to determine your personal tax rate, and don't forget to take advantage of the generous QBI deduction if you're eligible.

State and Local Income Taxes

Most states follow the federal treatment of each business structure. If you own a pass-through entity, your individual state income tax bracket will generally apply to your business earnings.

State tax rates and rules vary by location, so you should check your state’s laws or consult tax professionals.

Payroll Taxes

Employers must withhold and remit payroll taxes on employee wages. Payroll taxes generally include these components:

• Social Security and Medicare taxes: Social Security represents a 12.4% tax on up to $184,500 of employee wages in 2026. The Medicare tax is a 2.9% tax on all employee wages. Employers and employees split the tax burden, so each party pays 6.2% of Social Security and 1.45% of Medicare tax.

• Federal Unemployment Tax (FUTA): FUTA is 6% on the first $7,000 of each employee’s wages. Most employers pay an effective FUTA rate of 0.6% after a state credit.

• State Unemployment Tax (SUTA): SUTA is the state counterpart to the Federal Unemployment Tax. State-level unemployment tax rates vary.

Self-Employment Taxes

Self-employment tax applies to self-employed taxpayers, such as independent contractors, who do not have payroll taxes withheld on their earnings. Business owners subject to self-employment tax must pay 15.3% of business income. Self-employment tax covers the employer and employee portion of Social Security and Medicare taxes.

Self-employed individuals must also submit quarterly estimated tax payments to avoid underpayment penalties if they expect to owe $1,000 or more in taxes for the year.

Sales Tax

Many states and cities impose sales taxes on business transactions, such as the sale of merchandise. Tax rates and applicability depend on your business operations and location. We recommend partnering with tax professionals to determine whether you have a sales tax responsibility.

Common Business Taxes at a Glance

Step 4: Lower Your Income Tax Bill with Deductions and Credits

Business tax deductions and credits reduce the taxes you owe. Many business expenses are deductible on your tax return, regardless of your entity structure.

This list includes common deductible business expenses and tax credits for new businesses. Report your business tax deductions on your federal income tax return and use the relevant tax forms to determine your tax credits.

Business Tax Deductions

• Salaries and benefits paid to employees

• Supplies and office materials used in your daily operations

• Commercial rent paid for your office space

• Home office expenses incurred by home-based business owners

• Insurance premiums for business-related policies

• Startup costs of up to $5,000 incurred to organize your business, subject to IRS qualifications

• Travel and vehicle costs incurred for business meetings and events

• Section 179 for qualifying equipment of up to $2,560,000 in 2026

Business Tax Credits

• Work Opportunity Tax Credit for employers that hire individuals from certain groups, such as qualified veterans (IRS Form 5884, Work Opportunity Credit)

• Research and development (R&D) credit for qualified research relating to new or improved business development (IRS Form 6765, Credit for Increasing Research Activities)

• Small Business Health Care Tax Credit helps businesses with fewer than 25 employees offset up to 50% of premiums paid through the SHOP Marketplace (IRS Form 8941, Credit for Small Employer Health Insurance Premiums)

Maximize your business tax deductions and credits by partnering with professional accountants in 2026.

QBI Deduction

The QBI deduction was made permanent due to the passage of the One Big Beautiful Bill Act in 2025. It allows eligible self-employed individuals and pass-through business owners to deduct up to 20% of their net business income directly on their federal taxes.

The full deduction threshold begins phasing out for single filers at $201,750.

Step 5: Understand Tax Forms for Small Business Owners

Your federal income tax form depends on your business structure. The following list explains the business tax form for each entity type.

If you expect to owe $1,000 or more in taxes for the year, you will be responsible for calculating and making quarterly estimated tax payments. Use IRS Form 1040-ES, Estimated Tax for Individuals to determine what you owe.

Step 6: File and Pay Your Taxes

File your taxes on time to avoid fines and penalties. Use the following due date list to determine when to file your small business tax return and make tax payments.

Small Business Tax Return Deadlines

• Partnerships, S corporations, and multi-member LLCs: March 15

• C corporations, sole proprietorships, and single-member LLCs: April 15

Quarterly Estimated Payment Deadlines

C corps, self-employed professionals, and business owners must make quarterly estimated tax payments throughout the tax year. Refer to the following quarterly estimated payment due dates for businesses and individuals.

• First quarter estimated payment: April 15

• Second quarter estimated payment: June 15

• Third quarter estimated payment: September 15

• Fourth quarter estimated payment:

  • C corporations: December 15

  • Individuals: January 15

Avoid underpayment penalties if you qualify for a safe harbor rule. If you paid 100% of last year's tax liability, or 110% for higher earners, then the safe harbor rule applies.

Don’t let quarterly taxes interrupt your workflow. Let 1-800Accountant support your quarterly estimated payments so you never have to worry about missing a due date.

Penalties for Late Filing

If you miss a return or payment deadline, you could incur penalties and interest on your tax liability. The IRS imposes penalties for infractions such as:

• Failure to pay tax due (.5%, accruing to a 25% cap)

• Failure to timely file a return with tax due (5%, accruing to a 25% cap)

• Underpayment of tax due (Varies)

Penalties depend on the type of infraction, and accumulate each month until paid.

Common Small Business Tax Mistakes to Avoid

Avoiding these common mistakes helps ensure reliable data and a smoother tax season, while sidestepping costly penalties.

• Mixing personal and business finances (This may jeopardize your liability protection)

• Misclassifying employees as independent contractors (Penalties include back taxes and unpaid wages, with criminal charges in the most severe instances)

• Missing a quarterly estimated tax payment (Underpayment penalties accrue without a cap)

• Failing to track receipts and mileage throughout the year (The IRS often disallows last-minute mileage log reconstruction)

• Overlooking deductions and credits the business qualifies for (Deductions and credits reduce what you owe, and you should claim all that apply)

FAQs about Small Business Taxes

What tax form do I use for my first year in business?

The tax form you use depends on your business structure. Sole proprietors and single-member LLCs report business income using Schedule C on Form 1040. Partnerships use Form 1065, while corporations file Form 1120. If you're unsure which applies to your situation, a tax professional can help.

Do I need an EIN to file small business taxes?

You do not always need an EIN to file small business taxes. Sole proprietors without employees can use their personal Social Security number instead. However, you must have an EIN if you form a corporation, a partnership, or hire employees.

How much should I set aside for small business taxes?

You should generally set aside 25% to 30% of your net business income for taxes. This percentage covers federal income tax as well as self-employment tax for Social Security and Medicare. You may also need to adjust this amount depending on your state and local tax rates.

What happens if I miss a quarterly estimated tax payment?

Missing a quarterly estimated tax payment can result in an underpayment penalty from the IRS. The IRS calculates interest and penalties based on how late the payment is and how much you underpaid. You should make the late payment as soon as possible to prevent additional interest from accruing, as there's no cap.

Can I deduct startup costs before my business officially opens?

Yes, you can deduct up to $5,000 in startup costs and $5,000 in organizational costs in your first year ($10,000 combined). This deduction will apply if your total startup expenses do not exceed $50,000. Any costs above these limits must be amortized over 15 years.

Do single-member LLCs need to file a separate business tax return?

Single-member LLCs generally do not need to file a separate federal business tax return. The IRS treats them as disregarded entities for tax purposes by default. Like a sole proprietorship, you simply report your LLC's profits and losses on Schedule C of your personal tax return.

Building a Confident Start to Small Business Tax Compliance

This beginner's tax guide provides new owners with a foundational understanding of how to approach and manage their financial responsibilities. That's a lot of work you probably didn't account for, and if you lack the time or confidence to address it accurately, expert tax support is ready to pick up the slack.

If you'd rather focus on building your new business, explore 1-800Accountant's tax advisory solution to get the guidance and insight you need year-round to move your new operations forward.