Tax Write-Offs for New Engineering Firms: The Complete List

2026-08-21

Discover the full list of tax write-offs for new engineering firms, including startup costs, equipment, software, and more. Save money legally.

Starting an engineering firm is expensive, but the IRS allows you to deduct many of those costs. This guide covers the complete list of tax write-offs for new engineering firms, with realistic figures for 2026. You’ll learn what you can deduct, how to claim it, and practical steps to take this week.

1. Startup Costs (IRS Section 195)

Before your firm officially opens, you can deduct up to $5,000 in startup costs in your first year, but the deduction phases out dollar-for-dollar once total startup costs exceed $50,000. Any remaining costs are amortized over 180 months (15 years).

What counts as startup costs:

Market research and feasibility studies
Advertising and promotion before opening
Training employees before opening
Legal and accounting fees for setup
Office rent and utilities paid before opening

Practical step: Keep a separate ledger of all pre-opening expenses. If you spent more than $50,000, you’ll need to amortize the excess, so track every receipt.

2. Office Space and Utilities

If you lease office space, you can deduct rent, utilities, and property insurance. If you work from home, the home office deduction applies.

Home office deduction: You can use the simplified method ($5 per square foot, up to 300 square feet, max $1,500) or the actual expense method (percentage of mortgage interest, utilities, and repairs based on square footage). For an engineering firm, you likely need a dedicated space for design work, so the actual method may yield a larger deduction.

Rent costs: Typical office rent for a small engineering firm ranges from $1,200 to $3,500 per month depending on location and size. All of it is deductible.

Practical step: If you work from home, measure your office space and calculate the percentage of your home used exclusively for business. Document this in a written policy.

3. Equipment and Software

Engineering firms rely on expensive equipment and software. You have two options: deduct the full cost in the year of purchase (Section 179) or depreciate over time.

Section 179 deduction: For 2026, the limit is $1,220,000 for equipment purchases, so most new firms can deduct the full cost of computers, servers, and specialized machinery. This includes:

Computers, laptops, and monitors
Engineering software (CAD, FEA, simulation tools)
3D printers and prototyping equipment
Office furniture and fixtures

Software: Off-the-shelf software is deductible as a business expense, but custom software may need to be amortized over 36 months. Subscription-based software (SaaS) is fully deductible as an operating expense.

Price ranges:

CAD software: $2,000 to $8,000 per license (annual subscription)
Engineering workstations: $1,500 to $4,000 each
3D printers: $500 to $10,000

Practical step: Before year-end, list all equipment purchases and decide whether to use Section 179 or bonus depreciation. Consult your tax advisor to maximize the benefit.

4. Professional Fees and Insurance

You’ll need legal, accounting, and insurance services. These are fully deductible.

Deductible fees:

Legal fees for contracts, incorporation, and intellectual property
Accounting and bookkeeping services
Engineering-specific insurance: professional liability (errors and omissions), general liability, and workers’ compensation

Insurance costs: Professional liability insurance for engineers typically ranges from $1,500 to $5,000 per year for a small firm, depending on your specialty and risk level. General liability runs $500 to $1,500 per year.

Practical step: Review your insurance policies and ensure you’re paying for coverage that’s necessary. Keep all premium invoices for tax records.

5. Employee Salaries and Benefits

Salaries, wages, and bonuses for employees are deductible, as are employer-paid benefits like health insurance, retirement contributions, and paid time off.

Salary ranges: For a new engineering firm, entry-level engineers earn $65,000 to $85,000, senior engineers $100,000 to $140,000. These are fully deductible.

Benefits: Health insurance premiums, 401(k) matching (up to 25% of compensation), and workers’ compensation insurance are all deductible.

Practical step: If you’re a sole proprietor, you can deduct health insurance premiums for yourself and your family, but you must be profitable. Set up a retirement plan like a SEP IRA to deduct contributions.

6. Marketing and Advertising

Any cost to promote your firm is deductible, including website development, business cards, online ads, and client entertainment (subject to 50% limit for meals).

Typical costs:

Website design: $1,500 to $5,000
Business cards and brochures: $200 to $500
Google Ads or LinkedIn Ads: $500 to $2,000 per month
Industry conference attendance: $500 to $2,000 per event (including travel, but meals are 50% deductible)

Practical step: Track all marketing expenses in a separate category. For meals with clients, keep a log of the business purpose and the names of attendees.

7. Travel and Vehicle Expenses

If you travel to client sites or industry events, you can deduct airfare, hotels, rental cars, and 50% of meals. For vehicle use, you can use the standard mileage rate (67 cents per mile for 2026) or actual expenses.

Standard mileage rate: For 2026, the IRS rate is 67 cents per mile. If you drive 10,000 miles for business, that’s a $6,700 deduction.

Practical step: Keep a mileage log with dates, destinations, and purposes. Use an app like MileIQ to automate tracking.

8. Education and Training

Continuing education is mandatory for engineers. You can deduct the cost of courses, seminars, and professional certifications, as long as they maintain or improve skills in your current field.

Costs: Professional engineering (PE) exam prep courses range from $1,000 to $3,000. Annual licensing fees are also deductible.

Practical step: Save receipts for any course or conference you attend. If you’re taking a course that qualifies for a new degree, it may not be deductible, so check with your advisor.

9. Interest and Bank Fees

Interest on business loans, credit card interest, and bank fees are deductible. If you used personal funds to start the firm, you can deduct the interest on a home equity loan if used for business, but rules vary.

Practical step: Keep a separate business credit card and bank account to clearly track interest and fees.

10. Miscellaneous Expenses

Other deductible expenses include:

Postage and shipping
Office supplies (paper, ink, drafting materials)
Business licenses and permits
Dues to professional organizations (e.g., ASCE, IEEE)
Subscriptions to industry journals

Practical step: Set up a petty cash system for small purchases and keep receipts in a designated folder.

FAQ

Can I deduct the cost of a home office if I have a separate office? No, you can only deduct the home office if it’s used exclusively and regularly for business. If you have a separate office, you can’t claim the home office deduction.

What is the difference between Section 179 and bonus depreciation? Section 179 allows you to deduct the full cost of equipment up to a limit, but it’s capped at your taxable income. Bonus depreciation (100% for 2026) has no income limit, but it’s not available for all property types. Consult your tax advisor.

Are meals with clients 100% deductible? No, meals are 50% deductible, unless they qualify for the temporary 100% deduction for business meals from a restaurant (which expired in 2022). For 2026, assume 50%.

What if I don’t have enough profit to use all deductions? If your business operates at a loss, you may be able to carry the loss forward to offset future profits. However, hobby loss rules apply, so ensure you’re operating with a profit motive.

The bottom line

New engineering firms have a wide range of tax write-offs, from startup costs to equipment and professional fees. The key is to track every expense, understand the rules, and work with a tax professional who knows engineering firms. Start by organizing your receipts, reviewing your equipment purchases for Section 179, and setting up a mileage log. These steps will save you thousands come tax season.