Do I need to make quarterly estimated tax payments?

If you expect to owe $1,000 or more in federal taxes for the year, you are generally required to make quarterly estimated tax payments. The due dates are April 15, June 15, September 15, and January 15. Missing these payments can result in underpayment penalties. Your tax accountant can help you calculate the right amount based on your projected income.

What is the difference between a tax preparer and a tax accountant?

A tax preparer fills out and files your return. A tax accountant provides year-round services including tax planning, entity structuring advice, bookkeeping oversight, and IRS representation if needed. For a small business, a tax accountant who understands your industry and business structure will typically provide significantly more value than a basic preparer.

What records should I keep for my small business taxes?

Keep all income records (invoices, 1099s, bank statements), expense receipts, mileage logs, home office measurements, asset purchase records, payroll records, and bank/credit card statements. The IRS requires you to keep records for at least 3 years from the date you filed the return. For assets like equipment or property, keep records for as long as you own them plus 3 years after disposal.

15 min read

-Last updated: March 2026

The Ultimate Guide to Small Business Taxes

Everything small business owners need to know about federal and state tax obligations, deductions, entity structure, and when it makes sense to hire a professional.

Last updated: March 2026

Reviewed by Arc & Ledger Tax Team

Professional Guide

Overview

Small business taxes in the United States are not one filing. They are a system of federal, state, and sometimes local obligations that depend on your entity type, your industry, where you operate, and how much you earn. Getting it right means understanding what you owe, what you can deduct, and what deadlines you cannot miss.

This guide covers the fundamentals that every small business owner needs to understand. Whether you are a freelancer filing a Schedule C, an LLC owner evaluating an S-Corp election, or a growing business navigating multi-state tax obligations, the principles here apply.

The goal is not to turn you into a tax expert. It is to give you enough knowledge to make informed decisions, ask the right questions, and understand what your tax professional is doing on your behalf.

Business Entity Types & Tax Treatment

How your business is structured determines how you are taxed. Here are the most common options:

Sole Proprietorship / Single-Member LLC

The simplest structure. Business income and expenses are reported on Schedule C of your personal Form 1040. You pay income tax plus self-employment tax (15.3%) on net earnings. No separate business return is filed.

Best for:Freelancers, solo consultants, side businesses under $50K net income

Partnership / Multi-Member LLC

Files Form 1065 (informational return) and issues Schedule K-1 to each partner. The partnership itself does not pay income tax. Each partner reports their share of income on their personal return and pays self-employment tax on their distributive share.

Best for:Businesses with two or more owners

S Corporation

Files Form 1120-S and issues K-1s to shareholders. The key advantage: owners who actively work in the business pay themselves a "reasonable salary" (subject to payroll taxes) and can take remaining profits as distributions (not subject to self-employment tax). This can save 15.3% on a significant portion of income.

Best for:Profitable businesses with $50K+ net income where SE tax savings outweigh added compliance costs

C Corporation

Files Form 1120 and pays corporate income tax at a flat 21% rate. Shareholders pay tax again on dividends (double taxation). However, C-Corps can retain earnings at the 21% rate, offer more flexible benefit plans, and are required for certain situations (venture-funded startups, foreign ownership restrictions).

Best for:Businesses planning to reinvest profits, seek VC funding, or with foreign owners ineligible for S-Corp

Common Small Business Deductions

Deductions reduce your taxable income. Every legitimate business expense you fail to track is money left on the table. Here are the categories most small businesses should be tracking:

Home Office

Simplified method ($5/sq ft, max 300 sq ft = $1,500) or actual expenses prorated by square footage.

Vehicle Expenses

Standard mileage rate (70 cents/mile for 2025) or actual expenses. Keep a mileage log.

Health Insurance

Self-employed health insurance deduction (100% of premiums for you, spouse, and dependents).

Retirement Contributions

SEP IRA (up to 25% of net SE income, max $69,000), Solo 401(k), or SIMPLE IRA.

Equipment & Software

Section 179 deduction (up to $1,250,000 for 2025) or bonus depreciation for business assets.

Professional Services

Accounting, legal, consulting, and other professional fees are fully deductible.

Business Insurance

General liability, professional liability (E&O), workers comp, and business property insurance.

Marketing & Advertising

Website costs, advertising, business cards, and promotional materials.

Business Meals

50% deductible for meals with a clear business purpose. Keep receipts and note the business discussion.

Travel

Airfare, hotels, and transportation for business travel. Must be primarily for business purposes.

Estimated Tax Payments

The U.S. tax system is pay-as-you-go. If you do not have taxes withheld from a paycheck (as most business owners do not), you must make quarterly estimated tax payments to avoid underpayment penalties.

Who Must Pay Estimated Taxes?

Generally, you must make estimated tax payments if you expect to owe $1,000 or more in federal tax for the year. Safe harbor: pay either 100% of last year's tax or 90% of this year's tax to avoid penalties (110% of last year's tax if AGI exceeds $150,000).

Quarterly Due Dates

Jan - Mar

April 15

Apr - May

June 15

Jun - Aug

September 15

Sep - Dec

January 15

State & Local Tax Obligations

Federal taxes are just one part of the picture. Most small businesses also owe state and local taxes, which vary significantly by location:

State income tax: Most states impose an income tax on business earnings. Rates range from 0% (Texas, Florida, Wyoming) to 13.3% (California). Pass-through entities (LLCs, S-Corps) are typically taxed at the owner level.
Sales tax: If you sell taxable goods or services, you must collect and remit sales tax. Nexus rules (physical presence, economic nexus) determine where you have obligations.
Franchise/gross receipts tax: Some states (California, Texas, Delaware) impose a minimum tax or gross receipts tax regardless of profitability. California's $800 LLC franchise tax is a common example.
Local business taxes: Many cities impose their own business tax or business license fee. In Los Angeles, the Business Tax (formerly Business Tax Receipt Certificate) is based on gross receipts.

Bookkeeping & Record Keeping

Clean bookkeeping is the foundation of accurate tax preparation. Without organized records, your tax professional cannot identify all your deductions, and you risk problems if audited.

Bookkeeping Best Practices

Separate personal and business finances completely (dedicated business bank account and credit card)
Record all income and expenses as they occur, not at year-end
Keep digital copies of all receipts (apps like Dext or HubDoc can automate this)
Reconcile bank and credit card statements monthly
Use accounting software (QuickBooks Online, Xero) rather than spreadsheets
Maintain a mileage log if you use a vehicle for business
Track home office square footage and total home expenses if claiming the deduction
Keep records for at least 3 years (7 years is safer for business records)

Key Tax Deadlines

Deadline	What is Due	Who
January 31	W-2s and 1099s issued to recipients	Employers / payers
March 15	S-Corp (1120-S) and Partnership (1065) returns due	S-Corps, partnerships, multi-member LLCs
April 15	Individual (1040) and C-Corp (1120) returns due; Q1 estimated payment	All businesses
June 15	Q2 estimated tax payment	Self-employed / business owners
September 15	Extended S-Corp/Partnership returns due; Q3 estimated payment	S-Corps, partnerships
October 15	Extended Individual and C-Corp returns due	Individuals, C-Corps on extension
January 15	Q4 estimated tax payment	Self-employed / business owners

When Should a Small Business Hire a Tax Accountant?

Many small business owners start by doing their own taxes, which is fine for simple situations. But there are clear signals that it is time to bring in a professional:

Your net business income exceeds $50,000 (S-Corp election may save you thousands in SE tax)

You have employees or independent contractors (payroll tax compliance is complex)

You operate in multiple states (nexus and apportionment rules vary by state)

You have international financial ties (FBAR, FATCA, treaty compliance)

You received an IRS notice or are being audited

You are not sure if you are taking all available deductions

You spend more than 10 hours a year on your own taxes

You are considering a major business decision (buying equipment, hiring, changing entity type)

When choosing a tax professional, look for an Enrolled Agent (EA) or CPA with experience in small business taxation. Verify their credentials, ask about their experience with your specific entity type, and ensure they provide transparent pricing. A qualified professional will typically save you more in taxes and penalties than their fee costs.

Frequently Asked Questions

The cost of a small business tax accountant varies by entity type and complexity. A basic sole proprietor return (Schedule C) typically runs $300-$600. An LLC or S-Corp return (Form 1120-S or 1065) ranges from $800-$2,500. At Arc & Ledger, business returns start at $850 with a clear fee estimate provided before work begins. The right accountant will typically save you more in taxes than their fee.

You should consider hiring a tax accountant when your business earns more than $50,000 annually, when you have employees or contractors, when you operate in multiple states, when you are considering an entity change (like electing S-Corp status), or when you have significant deductions that require documentation. A qualified accountant ensures you are taking all available deductions while staying compliant.

There is no one-size-fits-all answer. Sole proprietorships are simplest but offer no liability protection. LLCs provide liability protection with pass-through taxation. S-Corps can save self-employment tax when your net income exceeds roughly $50,000-$60,000. C-Corps may benefit from the flat 21% corporate tax rate. The right structure depends on your income level, growth plans, and risk tolerance.

Common small business deductions include home office expenses (simplified or actual method), vehicle expenses (standard mileage or actual costs), business insurance, professional services (accounting, legal), office supplies and equipment (Section 179 or bonus depreciation), marketing and advertising, travel and meals (50% for business meals), retirement contributions (SEP IRA, Solo 401k), and health insurance premiums for self-employed individuals.

Key strategies include: maximizing deductions (track every business expense), choosing the right entity structure (S-Corp election can save 15.3% self-employment tax on a portion of income), contributing to retirement plans (SEP IRA allows up to $70,000 for 2025), timing income and expenses strategically, and taking advantage of Section 179 and bonus depreciation for equipment purchases. Proactive planning with a tax professional is the most effective approach.

Disclaimer: This guide is for general informational purposes only and is current as of its publication date. Tax laws change frequently. Please consult a qualified tax professional for advice specific to your situation.

Get Your Small Business Taxes Right

Arc & Ledger provides tax preparation, bookkeeping, and tax planning for small businesses in Los Angeles and nationwide. Schedule a free 15-minute consultation to discuss your situation.

Book a Consultation Or submit your details online

Related Services

Arc & Ledger provides professional assistance in these areas

Business Tax & Compliance

Tax returns for LLCs, S-Corps, C-Corps, and partnerships.

From $850

Learn More

Bookkeeping & Monthly Accounting

Clean books are the foundation of accurate tax preparation.

From $300/mo

Learn More

Tax Planning

Proactive quarterly planning to minimize your tax liability.

From $1,500

Learn More

View All Services

Related Guides

California Business Taxation Guide

Navigate California's complex tax landscape with guidance on entity selection, franchise tax, LLC fees, local taxes, and strategic planning opportunities.

Los Angeles & Culver City Business Tax Guide

Gross receipts tax rates, small business exemptions, the 2026 Culver City sales tax increase, and apportionment rules for businesses in Southern California.

Los Angeles MEHKO Program Guide

Permit requirements, operational limits, prohibited food items, and tax obligations for Microenterprise Home Kitchen Operations in Los Angeles County.

View all guides