What Taxes Does a New Engineering Firm Pay? A Complete Guide
Learn the federal, state, and local taxes new engineering firms face, with realistic 2026 rates, deadlines, and practical steps to stay compliant.
Starting an engineering firm brings a steep learning curve on taxes. You will owe federal income tax, self-employment tax (if you are a sole proprietor or partner), payroll taxes if you have employees, and likely state and local taxes. This guide breaks down each tax, gives realistic 2026 figures, and offers steps you can take this week to avoid surprises.
Federal Income Tax
Your firm’s structure determines how you pay federal income tax. Most new engineering firms start as an LLC or S corporation, but sole proprietorships and partnerships are also common.
- Sole proprietorship or single-member LLC: Profits pass through to your personal return (Form 1040). You pay tax at individual rates, which range from 10% to 37% for 2026. The top rate kicks in above $609,350 for single filers and $731,200 for married filing jointly.
- Partnership or multi-member LLC: The firm files Form 1065, but you report your share of profits on your personal return. Same individual rates apply.
- S corporation: The firm files Form 1120-S. Profits pass through to shareholders, but you must pay yourself a “reasonable salary” (subject to payroll taxes). The remaining profits are not subject to self-employment tax, only income tax.
- C corporation: The firm pays a flat 21% corporate rate (2026). Shareholders also pay tax on dividends, creating double taxation. Most new engineering firms avoid this structure unless they plan to reinvest heavily or seek outside investors.
Estimated tax payments: If you expect to owe $1,000 or more, you must make quarterly estimated payments. For 2026, the due dates are April 15, June 15, September 15, and January 15, 2027. Use Form 1040-ES. A safe rule: set aside 25% to 30% of net profits for federal income tax.
Self-Employment Tax
If you are a sole proprietor, partner, or single-member LLC owner, you pay self-employment tax (Social Security and Medicare) on your net earnings. The rate is 15.3% (12.4% for Social Security up to a wage base of $168,600 in 2026, plus 2.9% for Medicare with no cap). You can deduct the employer-equivalent half (7.65%) as an adjustment to income.
If you form an S corporation, you avoid self-employment tax on distributions, but you must pay yourself a reasonable salary. For an engineering firm, a reasonable salary might be $80,000 to $120,000, depending on your role and region. That salary is subject to payroll taxes (Social Security, Medicare, and unemployment).
Payroll Taxes
If you hire employees, you become responsible for payroll taxes. These include:
- Federal income tax withholding: You withhold from each paycheck based on the employee’s W-4.
- Social Security and Medicare (FICA): You withhold 7.65% from the employee and pay a matching 7.65%.
- Federal unemployment tax (FUTA): You pay 6% on the first $7,000 of each employee’s wages, but you get a credit of up to 5.4% if you pay state unemployment taxes on time, netting 0.6% ($42 per employee).
You must deposit payroll taxes using the Electronic Federal Tax Payment System (EFTPS). Deposit schedules are monthly or semi-weekly, depending on your total tax liability. For a new firm, monthly deposits are typical if your liability is under $50,000 per year.
State and Local Taxes
State taxes vary widely. Most states impose a corporate income tax or a pass-through entity tax. As of 2026, 44 states have a corporate income tax, with rates ranging from 2.5% (North Carolina) to 11.5% (New Jersey). For pass-through entities, many states have a personal income tax, but some (like Texas and Nevada) have no income tax but instead impose a gross receipts tax or franchise tax.
- State income tax: If your state has one, you’ll pay tax on your firm’s net income. For pass-through entities, you report your share on your personal state return.
- Gross receipts tax: Texas has a franchise tax (0.375% for most businesses), and Washington has a business and occupation tax (ranging from 0.471% to 1.5% depending on classification).
- Local taxes: Some cities (e.g., New York City, Philadelphia) impose their own business income taxes or gross receipts taxes. Check with your local tax authority.
Sales and Use Tax
Engineering services are generally not subject to sales tax in most states, but there are exceptions. For example, some states tax engineering services if they are part of a construction contract. Also, if you sell physical products (e.g., prototypes, software licenses, or printed plans), you may need to collect sales tax. As of 2026, 45 states and the District of Columbia have a sales tax. Rates range from 2.9% (Colorado) to 7.25% (California), plus local add-ons.
Practical step: Determine if your state taxes engineering services. If yes, register for a sales tax permit and collect tax on applicable invoices. If no, you still need to pay use tax on tangible property you buy without sales tax (e.g., online purchases).
Property Taxes
If you own office space, you pay real property tax based on the assessed value. Rates vary by locality, typically 0.5% to 2.5% of assessed value. If you lease, you may not pay property tax directly, but your rent often includes a pass-through for the landlord’s property taxes.
You may also owe personal property tax on equipment (computers, testing instruments, furniture). Some states exempt small businesses or have a low threshold. For example, California exempts the first $500,000 of personal property, while Texas has no personal property tax for most businesses.
Tax Deadlines and Forms Quick Reference
| Tax | Form | Deadline (2026) |
|---|---|---|
| Federal income tax (pass-through) | 1040 | April 15, 2026 (or extended to Oct 15) |
| Federal income tax (C corp) | 1120 | April 15, 2026 (or extended) |
| Partnership/LLC return | 1065 | March 15, 2026 (or extended) |
| S corp return | 1120-S | March 15, 2026 (or extended) |
| Estimated tax payments | 1040-ES | Apr 15, Jun 15, Sep 15, Jan 15 |
| Payroll tax deposits | EFTPS | Monthly or semi-weekly |
| State income tax | Varies | Varies, often same as federal |
| Sales tax return | Varies | Monthly, quarterly, or annually |
Steps to Take This Week
- Choose your entity structure. If you haven’t already, consult a CPA or tax attorney. For most new engineering firms, an S corporation is attractive because it saves self-employment tax, but it requires payroll setup. A single-member LLC is simpler and fine for early years.
- Get an EIN. Apply for an Employer Identification Number from the IRS. It’s free and takes minutes online.
- Open a separate business bank account. This is critical for clean bookkeeping and tax deductions.
- Set up accounting software. Use QuickBooks, Xero, or FreshBooks to track income and expenses. Categorize expenses like software subscriptions, professional liability insurance, and continuing education.
- Register for state taxes. Check your state’s revenue department for income tax, sales tax, and any local licenses.
- Set aside money for taxes. Open a separate savings account and transfer 25% to 30% of every client payment for federal taxes, plus 5% to 10% for state.
- Schedule a meeting with a tax professional. A CPA who works with engineering firms can help you plan for deductions specific to your field, like software, equipment, and professional dues.
FAQ
Q: Do I need to charge sales tax on my engineering services? A: In most states, professional engineering services are exempt from sales tax. However, some states tax services when they are part of a construction contract or if you sell physical deliverables. Check your state’s rules or ask your CPA.
Q: Can I deduct the cost of my engineering software? A: Yes. Software you use for your business, such as AutoCAD or MATLAB, is deductible as a business expense. If you buy it outright, you can deduct the full cost under Section 179 (up to $1,220,000 in 2026) or depreciate it over time.
Q: What is the best entity structure for tax savings? A: For many new engineering firms, an S corporation offers the best balance of liability protection and tax savings because it avoids self-employment tax on distributions. However, you must pay yourself a reasonable salary, which requires payroll processing. A single-member LLC is simpler and may be better if your profits are low.
Q: When are estimated tax payments due? A: For 2026, the due dates are April 15, June 15, September 15, and January 15, 2027. If you miss a payment, you may face penalties, so set reminders and pay at least 90% of your current year’s liability or 100% of last year’s (110% if your adjusted gross income is over $150,000).
The Bottom Line
New engineering firms face a complex tax landscape, but understanding the basics helps you plan. You will pay federal income tax, self-employment tax (or payroll taxes), and state and local taxes. Set aside 25% to 30% of profits for taxes, make quarterly estimated payments, and use a CPA to optimize deductions. Start with the steps above this week to stay compliant and avoid penalties. With proper planning, taxes become a manageable part of running your firm, not a crisis at year-end.