Startup Taxes: A 2026 Guide to Compliance and Deductions for Founders

When you’re starting a business, taxes may not be the first thing on your mind. You've got a product or service to develop, a team to hire, and customers to reach. But new businesses still have tax obligations, even before they start turning a profit. The good news is that the IRS does offer support in the form of credits and deductions to help you get your business off the ground.

Here’s what you should know about how to structure your startup for the best tax advantage, what taxes you should have on your radar, and how to take advantage of the relief options available to you.

Selecting a Business Structure for Tax Efficiency

The way you choose to structure your business has a considerable impact on how you pay taxes. The IRS treats some business structures as separate entities that are taxed directly. For others, the income passes straight through to the owners, who then pay the taxes on their personal returns. Most startups will choose from one of the following structures:

• Single-Member LLC: A single-member LLC is one of the simplest structures to set up and maintain. It is owned by one person and treated by the IRS as a "disregarded entity" by default. This means the owner reports all business income and expenses on Schedule C of their personal tax return. Owners can also choose to be taxed as an S corp if that becomes more advantageous as the business grows.
• Multi-Member LLC: A multi-member LLC combines liability protection with pass-through taxation, with profits and losses divided among members. This is a popular choice for small teams and co-founded businesses that aren't planning to raise capital.
• S corporation: An S corp provides the liability protection of a corporation, but passes profits and losses through to the owner’s personal tax returns. The business itself doesn’t pay federal income tax. This structure can be beneficial for small startups; however, S corps can have no more than 100 shareholders, and all shareholders must be U.S. citizens or permanent residents. This may make them a poor fit for startups seeking outside investment.
• C corporation: Because C corps allow for multiple classes of stock and unlimited shareholders, they are the go-to structure for startups planning to raise venture capital. The tradeoff, however, is that both the company and the shareholders are subject to taxation. The company pays corporate income tax on profits, and shareholders pay personal income tax on their dividends.

Filing Forms by Business Structure

Each type of business structure uses a different form for tax filing:

• Single-Member LLC (Taxed as a Sole Proprietor): Schedule C, filed with the owner's Form 1040
• LLC Electing S corp Taxation: Form 1120-S, after filing Form 2553 to make the election
• LLC (Taxed as a Partnership): Form 1065 (U.S. Return of Partnership Income); members report income on Schedule K-1(Form 1065)
• S corporation: Form 1120-S (U.S. Income Tax Return for an S corporation); shareholders report income on Schedule K-1 (Form 11-20S)
• C corporation: Form 1120 (U.S. Corporation Income Tax Return)

Federal Tax Obligations for New Companies

Once your business is up and running, your ongoing tax obligations will vary depending on your business structure and whether you have employees.

Income and Self-Employment Taxes

If you're running your startup as a sole proprietorship or single-member LLC, you're responsible for both income tax and self-employment tax. The self-employment tax rate is currently 15.3% (12.4% for Social Security and 2.9% for Medicare). When you work for an employer, they cover half of this; when you work for yourself, you cover all of it. You can deduct the employer-equivalent portion (half of what you pay) on your personal tax return, which helps offset the cost.

If you expect to owe at least $1,000 in taxes for the year, the IRS requires you to pay quarterly estimated tax payments. Skipping these payments or underpaying can result in a penalty even if you pay everything you owe by the April filing deadline.

Estimated tax payments are typically due in April, June, September, and January. Use Form 1040-ES to figure out how much to pay based on your expected income, deductions, and credits for the year.

Payroll Tax Responsibilities

If you hire employees for your business, you are responsible for withholding FICA taxes (Social Security and Medicare) from their paychecks. Employees pay a total of 7.65% in FICA taxes (6.2% for Social Security and 1.45% for Medicare), and you as the employer match that amount dollar for dollar. You're also responsible for withholding federal income tax based on each employee's W-4 and remitting everything to the IRS either monthly or semi-weekly, depending on your payroll size.

Be sure everyone you hire is correctly classified as either an employee or an independent contractor under the Department of Labor’s independent contractor rule. If an employee is misclassified as a contractor, you could be held liable for all unpaid payroll taxes — both the employee's share and yours — plus interest and penalties.

To help reduce the complexity and administrative burden of payroll tax management and ensure compliance, you can use payroll software to automatically calculate and withhold the correct tax amounts on your behalf.

Federal Unemployment Taxes (FUTA)

Employers must pay a 6.0% on the first $7,000 in wages for every employee who earns more than $1,500 per quarter or works at least 20 weeks during the year. This tax funds unemployment insurance and benefits and is paid quarterly in April, July, October, and January (for the previous year). Employers must file Form 940 by January 31st to report their total FUTA taxes for the previous year.

State and Local Tax Requirements

In addition to federal taxes, you also need to plan for state and local tax obligations. Depending on where your startup operates and where your customers are located, these may include:

• State Income or Corporate Tax: Most states with an income tax require businesses to file a state return in addition to their federal return.
• Sales and Use Tax: This tax is required in most states when selling taxable goods or certain services.
• Payroll and Unemployment Taxes: These state-level obligations apply for any employees on your payroll.
• Local Business Taxes: Some cities and counties impose their own taxes, like San Francisco's annual business tax return.

The rules vary significantly by state, so it's important to understand your obligations in every state where you operate, sell, or have employees.

Understanding Sales Tax Nexus

You don't need a physical office in a state to owe that state’s sales tax. A 2018 Supreme Court ruling known as the Wayfair decision determined that states can collect sales tax from businesses with an economic presence, or nexus, in that state even if they do not have a physical location there. Businesses selling online to customers in other states must pay sales tax in each state where they meet minimum sales thresholds.

Thresholds vary by state and are usually based on a minimum sales volume or number of transactions. Once you cross a state's threshold, you must register with that state, start collecting sales tax, and file returns on a monthly, quarterly, or annual basis. This can be an especially complex undertaking for remote-first businesses that sell online to customers in many states. Automated sales tax software can help you monitor sales thresholds for the states in which you do business, apply the correct sales tax rates, and file returns.

Franchise and Privilege Taxes

Some states charge a fee, known as a franchise tax, for the privilege of doing business in that state. Unlike income taxes, franchise taxes are not based on how much you make, which means you must pay them regardless of whether you turn a profit.

The amount you owe varies widely by state and is often calculated based on factors like your authorized shares, net worth, or gross receipts. Several states have unique requirements that may catch founders off guard:

• Delaware: Any business incorporated in Delaware must file an Annual Franchise Tax Report and pay franchise tax, even if it conducts no business in the state. Corporations must file by March 1st each year.
• California: Businesses operating in California owe an $800 minimum franchise tax annually, even in the first year of operation
• Texas: The Texas Franchise Tax is a privilege tax imposed on each business formed in Texas or doing business in the state. It is calculated as a percentage of the business's margin. Even if your entity qualifies for "no tax due," you still must file a Texas Franchise Tax Report by May 15.
• Tennessee: Tennessee imposes both a franchise tax and an excise tax on businesses operating in the state. This dual filing requirement often surprises founders who expect a single franchise tax.

Essential Tax Deductions and Credits for Startups

Running a startup is expensive, but the tax code has several built-in deductions and credits to help offset some of those early costs. Deductions reduce the income you're taxed on, while credits reduce your actual tax bill. Knowing which ones you qualify for can help you reduce costs in the early stages of your business.

The $5,000 Startup Cost Deduction

To get your company up and running, you’ll need to spend money on things like legal fees, market research, travel, licenses and permits, technology, and equipment before you open your doors. Under Section 195 of the IRS code, new businesses can deduct up to $5,000 in startup costs like these in their first year of operation, as long as costs remain under $50,000.

If your total startup costs exceed $50,000, the $5,000 deduction phases out dollar-for-dollar, reducing your deduction by the amount that exceeds the threshold. For example, if you spent $53,000 getting started, your allowable first-year deduction drops to $2,000. Any costs you can't deduct in year one are amortized, meaning you spread the remaining deduction out over 180 months (15 years). If you expect to have high startup costs, keep detailed records so you can support each deduction over time.

Research and Development (R&D) Tax Credit

If your team is building new software or developing a product, you may be eligible for the small business research and development credit. Qualified small businesses with less than $5 million in gross receipts can apply up to $500,000 of their R&D credit against their payroll tax liability annually, even without income tax liability. The credit first reduces your employer's share of Social Security tax, and any remaining amount can then go toward your employer's Medicare tax.

Activities that commonly qualify for the R&D credit include:

• Developing new or improved software or technology
• Creating patentable products or processes
• Improving existing manufacturing or engineering methods
• Conducting technical experiments where the outcome is uncertain
• Paying wages to employees or contractors performing qualified research

To claim the credit, file Form 6765 with your annual tax return and attach Form 8974 to your quarterly payroll tax returns. Because documentation requirements can be complex, it’s helpful to work with a CPA experienced in R&D credits to ensure compliance.

Streamlining Tax Compliance and Payroll

Managing payroll and taxes manually might seem manageable when your startup is small, but it takes time and comes with risks. Payroll automation can help you avoid missed deadlines, data entry errors, inaccurate calculations, and the penalties that go with them.

A payroll platform that automates calculations, compliance, and filings can make a big difference for growing startups:

• Multi-Jurisdiction Compliance: If you operate in multiple states, a payroll platform tracks each jurisdiction's tax rates, filing schedules, and labor requirements automatically.
• Compliance Changes: Tax law, payroll rates, and state labor requirements change frequently. When these updates occur, the platform adjusts automatically so you don’t have to research every change yourself.
• System Integration: When payroll connects directly to your accounting and tax filing tools, the data flows through without being re-entered at each step. This reduces errors and keeps records organized so you have all your documentation when tax season arrives.
• Scalability: As your startup adds employees, contractors, or offices in new locations, the payroll platform grows with you. This makes it easier to handle increased complexity as you scale from a single founder to a large team.

The 2026 Startup Tax Calendar

Staying ahead of tax deadlines is one of the simplest ways to avoid penalties. Use this calendar as a quick reference for the dates that matter most to your startup in 2026 and early 2027.

Note: June 15 falls on a Sunday in 2026, so the Q2 estimated tax deadline shifts to Monday, June 16. When any tax deadline falls on a weekend or federal holiday, the IRS moves it to the next business day.