7 Things to Know Before You Start a New Consulting Firm

2026-08-21

New consulting firm? Learn the 7 tax essentials: entity choice, deductions, quarterly payments, and more. Practical steps for 2026.

Starting a consulting firm is exciting, but taxes can trip you up if you’re not prepared. Here are 7 things you need to know before you hang your shingle, with practical steps you can take this week.

1. Your Business Structure Affects Your Tax Bill

Your choice of entity determines how you pay taxes and your personal liability. For most solo consultants, an LLC or S-corp is common, but each has trade-offs.

Sole Proprietorship: Easiest to set up, but you pay self-employment tax on all net income (15.3% in 2026).
LLC (single-member): Treated as a sole proprietorship for taxes unless you elect S-corp status. Offers liability protection.
S-Corp: You pay yourself a reasonable salary (subject to payroll taxes) and take the rest as distributions, which are not subject to self-employment tax. This can save money, but requires payroll setup and more paperwork.
C-Corp: Rare for new consultants due to double taxation, but may be useful if you plan to raise venture capital.

This week: Talk to a CPA or use an online service like LegalZoom to compare costs. Filing an LLC costs $50-$500 depending on your state. S-corp election adds $100-$300 in filing fees and ongoing payroll costs of $40-$100/month.

2. You Must Pay Estimated Quarterly Taxes

Consulting income has no withholding, so you must pay estimated taxes quarterly. The IRS requires this if you expect to owe more than $1,000 in taxes for the year. Deadlines are typically April 15, June 15, September 15, and January 15.

How to calculate: Estimate your annual income, subtract deductions, apply the tax rate (federal plus state, typically 25%-35% total for a consultant earning $80,000-$150,000). Divide by 4 and pay each quarter.

This week: Set aside 25%-30% of every client payment into a separate savings account. Use IRS Form 1040-ES to calculate your first payment. If you miss a deadline, you’ll face penalties (currently 0.5% of the unpaid amount per month).

3. Home Office Deduction: Use It or Lose It

If you work from home, you can deduct a portion of your rent, utilities, and internet. The IRS offers two methods:

Simplified method: Deduct $5 per square foot of home office space, up to 300 square feet (max $1,500).
Regular method: Calculate actual expenses based on the percentage of your home used exclusively for business. This often yields a larger deduction but requires more record-keeping.

This week: Measure your home office space and calculate both methods. Ensure the space is used regularly and exclusively for business (a spare room with a desk qualifies, but a corner of your living room may not).

4. Track Every Deductible Expense from Day One

Consultants can deduct a wide range of business expenses, which lowers your taxable income. Common ones include:

Software and subscriptions: $20-$200/month for tools like QuickBooks, Zoom, or project management software.
Professional development: Courses, conferences, and books (deductible if they improve your skills).
Travel and meals: Business travel is 100% deductible; meals with clients are 50% deductible (in 2026, the 100% deduction for business meals has expired, so it’s back to 50%).
Marketing and advertising: Website hosting, Google Ads, business cards.
Health insurance premiums: If you’re self-employed, you can deduct premiums for you and your family.

This week: Open a separate business credit card and use it for all business expenses. Download an expense tracking app like Expensify or use a simple spreadsheet. Keep all receipts, even for small purchases.

5. Retirement Plans Offer Big Tax Breaks

As a consultant, you can save for retirement and reduce your taxable income simultaneously. Options include:

SEP IRA: Contribute up to 25% of net earnings, max $66,000 in 2026. Easy to set up.
Solo 401(k): Allows employee and employer contributions, with a total limit of $66,000 (plus catch-up if over 50). More paperwork but higher contribution potential.
Traditional IRA: Lower limit ($7,000 in 2026), but no employer contribution.

This week: Open a SEP IRA with a brokerage like Fidelity or Vanguard. Even a small contribution reduces your tax bill. For example, if you’re in the 24% tax bracket, a $10,000 contribution saves $2,400 in federal taxes.

6. State Taxes and Local Licenses Vary

Don’t forget state and local obligations. Some states have no income tax (Texas, Florida), while others have high rates (California up to 13.3%). You may also need a business license, sales tax permit, or professional liability insurance.

This week: Check your state’s revenue department website for income tax requirements. Visit your city or county clerk’s office to see if a business license is required (fees range from $50 to $400). If you sell digital products or services, you may need to collect sales tax in some states.

7. Hiring Help: When to Bring in a CPA or Bookkeeper

You can handle taxes yourself, but a professional can save you money and stress. A CPA can help with entity selection, quarterly planning, and audit protection. A bookkeeper can manage day-to-day transactions.

CPA fees: $150-$400/hour for consultations; $500-$2,000 for annual tax preparation.
Bookkeeper fees: $50-$150/hour, or $200-$500/month for ongoing services.

This week: Interview 2-3 CPAs who work with consultants. Ask about their experience with S-corps and estimated taxes. If your income is under $50,000, you might start with software like TurboTax Self-Employed ($120-$200) and hire a CPA later.

FAQ

Q: When should I start paying estimated taxes? A: As soon as you expect to owe more than $1,000 in taxes. If you’re starting mid-year, you may need to pay your first quarter’s amount within 3-4 months of your first income.

Q: Can I deduct my home internet bill? A: Yes, but only the percentage used for business. If you use it 50% for work, deduct 50% of the bill. The same applies to your phone.

Q: What if I don’t make a profit in my first year? A: You can still deduct business expenses, but if you have losses for 3 of 5 years, the IRS may classify your consulting as a hobby, disallowing deductions. Keep detailed records and show you’re trying to make a profit.

Q: Should I form an S-corp right away? A: Not necessarily. If your net income is under $40,000, the savings may not outweigh the costs. Many consultants wait until they’re earning $60,000-$80,000 to make the switch.

The Bottom Line

Starting a consulting firm is exciting, but taxes can trip you up if you’re not prepared. Choose the right structure, set aside money for quarterly payments, and track every deduction. Take one step this week: open a separate bank account for business, or schedule a call with a CPA. A little planning now saves you thousands later.

Remember, tax laws change, so consult a professional for advice tailored to your situation. But with these 7 basics, you’re ahead of most new consultants.