The Complete New Engineering Firm Startup Checklist

Starting an engineering firm is exciting, but the business side can feel overwhelming. This checklist walks you through the essential steps to get your firm off the ground legally and financially sound, with a focus on tax obligations. Follow it in order, and you’ll avoid common pitfalls that trip up new owners.

1. Choose Your Legal Structure

Your business structure affects your taxes, liability, and paperwork. For most engineering firms, an LLC or S-corp is the best fit.

• LLC (Single-member or multi-member): Simple, flexible, and pass-through taxation. Costs $50-$500 to file, depending on your state.
• S-corp: If you plan to take a salary and distributions, this can save on self-employment taxes. Requires more payroll administration.
• C-corp: Rarely ideal for new firms unless you’re seeking outside investors.

Action step: File your formation documents with your state’s Secretary of State. If you’re unsure, consult a business attorney ($150-$350/hour) or use a service like LegalZoom ($79-$299 plus state fees).

2. Get an EIN and Open a Business Bank Account

An Employer Identification Number (EIN) is your business’s tax ID. You need it to open a bank account, hire employees, and file taxes.

• EIN: Free from the IRS website; takes about 10 minutes.
• Business bank account: Keeps personal and business finances separate, which is critical for tax deductions and liability protection. Look for no-fee accounts at local banks or online options like Novo or Mercury.

Action step: Apply for your EIN today, then open your bank account within a week.

3. Register for State and Local Taxes

Depending on your state and city, you may need to register for:

• Sales tax: If you sell physical products (e.g., prototypes), you may need a seller’s permit. Most engineering services are not taxable, but check your state.
• State income tax: If your state has income tax, you’ll need to register with the state revenue department.
• Local business licenses: Many cities require a general business license ($50-$400/year).

Action step: Search “[your state] business registration” and complete the online forms. Budget $100-$500 in initial fees.

4. Set Up Your Accounting System

You need a reliable way to track income, expenses, and invoices from day one. Options include:

• QuickBooks Online: $30-$200/month, depending on plan. The most common choice for small firms.
• FreshBooks: $19-$55/month, good for service-based businesses with simple invoicing.
• Xero: $13-$65/month, a solid alternative with strong integrations.

Action step: Sign up for one of these within the first week. If you’re not comfortable with bookkeeping, hire a part-time bookkeeper ($50-$150/hour) to set up your chart of accounts.

5. Understand Your Tax Obligations

Engineering firms face several tax layers. Here’s what you need to know:

• Federal income tax: Your business profits are taxed at your personal rate (if pass-through) or corporate rate (if C-corp).
• Self-employment tax: If you’re a sole proprietor or LLC owner, you pay 15.3% on net earnings (Social Security and Medicare).
• Estimated quarterly taxes: The IRS expects you to pay taxes quarterly if you expect to owe more than $1,000. Use Form 1040-ES. Penalties for underpayment can be steep.
• State taxes: Varies by state; some have flat rates, others progressive.

Action step: Calculate your projected annual income and set aside 25%-30% of every payment for taxes. Open a separate savings account for this.

6. Get Professional Liability Insurance

Engineering requires professional liability (errors and omissions) insurance. This covers claims of negligence or mistakes in your work.

• Cost: $2,000-$6,000/year for a small firm, depending on your specialty and coverage limits.
• General liability: Covers bodily injury or property damage; about $500-$1,000/year.
• Workers’ comp: Required if you have employees; costs vary by state and payroll.

Action step: Get quotes from three insurers (e.g., Hiscox, The Hartford, or a broker). Don’t skip this; one claim can bankrupt a new firm.

7. Create a Client Contract Template

A solid contract protects you and sets clear expectations. Include:

• Scope of work and deliverables
• Payment terms (e.g., 50% upfront, 50% on completion)
• Change order process
• Limitation of liability clause
• Dispute resolution method

Action step: Hire an attorney to draft a template ($500-$1,500) or use a service like Rocket Lawyer ($15/month). Customize it for each project.

8. Set Up Payroll (If You Have Employees)

If you hire staff, you must handle payroll taxes (federal, state, and local). Options:

• Payroll service: Gusto ($39-$99/month + $6/person), ADP, or Paychex. They handle tax filings and withholdings.
• DIY: Use QuickBooks Payroll ($45-$75/month) or process manually, but this is time-consuming and error-prone.

Action step: If you plan to hire within the first year, set up payroll before your first hire. Otherwise, you can wait.

9. Track Deductible Expenses

Maximize your tax deductions by tracking every business expense. Common ones for engineering firms:

• Software subscriptions (CAD, project management)
• Office rent and utilities
• Equipment (computers, printers, calculators)
• Professional development (courses, conferences)
• Travel for client meetings
• Home office deduction (if applicable)

Action step: Use a receipt scanner app (e.g., Expensify or Shoeboxed) to digitize receipts. Categorize expenses weekly.

10. Plan for Quarterly Tax Deadlines

Mark these dates on your calendar:

• April 15 (Q1)
• June 15 (Q2)
• September 15 (Q3)
• January 15 (Q4)

Action step: Before each deadline, review your income and expenses, and pay your estimated taxes via the IRS Direct Pay system or EFTPS.

FAQ

Q: Do I need to charge sales tax on engineering services? A: In most states, professional services like engineering are not subject to sales tax. However, if you sell physical products (e.g., custom parts), you may need to collect sales tax. Check your state’s rules.

Q: Can I deduct my home office if I work from home? A: Yes, if you have a dedicated space used exclusively for business. You can use the simplified method ($5 per square foot, up to 300 sq ft) or actual expenses. Keep records.

Q: What happens if I miss a quarterly tax payment? A: The IRS charges penalties and interest on underpayment. The penalty is typically 0.5% of the unpaid amount per month, up to 25%. Avoid this by setting reminders.

Q: Should I hire a CPA or use software? A: For the first year, software can handle basic filing, but a CPA ($200-$500 for a simple return) can identify deductions you might miss and help with quarterly planning. It’s a worthwhile investment.

Related guides

• The Annual New Engineering Firm Review Checklist
• 7 Questions to Ask Before Buying a New Engineering Firm
• 7 Things to Know Before You Start a New Engineering Firm

The bottom line

Starting an engineering firm requires careful planning, but this checklist gives you a clear path. Focus on legal setup, tax compliance, and financial systems first. Within the first month, you should have your structure, EIN, bank account, accounting software, and insurance in place. Set aside 25%-30% of income for taxes, and track every expense. With these foundations, you can focus on delivering great engineering work and growing your business.