7 Mistakes Solo Attorney Practices Make in Their First Year

2026-08-21

Avoid costly tax errors in your first year as a solo attorney. Learn the 7 most common mistakes and practical steps to fix them.

Starting a solo law practice is exciting, but the first year is also when many attorneys make tax mistakes that cost them time, money, and stress. The good news: most of these mistakes are avoidable if you know what to watch for. Here are the 7 most common tax mistakes solo attorneys make in their first year, and how to avoid them.

1. Not Setting Up a Separate Business Bank Account

One of the first things you should do is open a dedicated business checking account. Many solo attorneys start by using a personal account for business expenses, which creates a mess at tax time. Without a separate account, you risk missing deductions, mixing personal and business funds, and facing audit red flags.

What to do this week: Open a business checking account. Most banks offer free business checking for low balances. Keep all business income and expenses in this account. Also, consider a separate savings account for tax payments.

2. Ignoring Quarterly Estimated Tax Payments

As a solo attorney, you are responsible for paying taxes on your income throughout the year. The IRS expects quarterly estimated payments if you expect to owe more than $1,000 in tax. Missing these payments can result in penalties and interest.

What to do this week: Calculate your expected annual income and tax liability. Use IRS Form 1040-ES to estimate your quarterly payments. Deadlines are typically April 15, June 15, September 15, and January 15. Set reminders and pay on time.

3. Misclassifying Yourself for Tax Purposes

Solo attorneys are typically self-employed, but some mistakenly classify themselves as employees of their own practice. This affects how you pay Social Security and Medicare taxes. As a self-employed individual, you pay both the employee and employer portions, which is 15.3% total. If you classify incorrectly, you could underpay and face penalties.

What to do this week: Confirm your business structure. Most solo attorneys are sole proprietors or single-member LLCs. If you are a sole proprietor, you report business income on Schedule C. If you are an LLC, you may still be taxed as a sole proprietor unless you elect S-corp status. Consult a tax professional to ensure correct classification.

4. Overlooking Home Office Deduction

If you work from home, you may be eligible for the home office deduction. This deduction allows you to deduct a portion of your rent, utilities, and internet based on the square footage of your office space. Many solo attorneys skip this deduction because they think it’s complicated or risky, but it’s legitimate and can save you hundreds of dollars.

What to do this week: Measure your home office space. The IRS offers a simplified method: $5 per square foot, up to 300 square feet, maxing at $1,500. Alternatively, use the regular method with actual expenses. Ensure your home office is used regularly and exclusively for business.

5. Failing to Track Mileage and Business Expenses

Your car mileage for client meetings, court appearances, and errands is deductible. Also, expenses like legal research subscriptions, bar dues, and continuing education are deductible. Not tracking these means missing out on significant tax savings.

What to do this week: Start a mileage log. Use an app like MileIQ or a simple spreadsheet. Record every business trip: date, miles, purpose. Also, keep receipts for all business expenses. Use a system like QuickBooks or a simple folder for receipts.

6. Not Separating Retainer Funds Properly

Retainer funds are not income until you earn them. If you deposit retainers into your operating account and spend them, you may owe taxes on money you haven’t earned yet. This can create cash flow problems and tax issues.

What to do this week: Open a separate client trust account for retainers. Transfer funds to your operating account only when you have billed for work. This keeps your accounting clean and avoids tax on unearned income.

7. Delaying Tax Planning Until April

Waiting until tax season to think about taxes is a common mistake. By then, it’s too late to make strategic decisions that could reduce your tax bill. Proactive planning throughout the year can help you take advantage of deductions and retirement contributions.

What to do this week: Schedule a meeting with a tax professional who works with solo attorneys. Review your income and expenses quarterly. Consider setting up a retirement plan like a SEP IRA, which allows contributions up to 25% of net earnings, max $66,000 in 2026. Also, consider health insurance premiums and other deductions.

FAQ

Q: Can I deduct the cost of a new laptop for my practice?

A: Yes, if you use it primarily for business. You can deduct the full cost under Section 179, up to $1,160,000 in 2026, or depreciate it over time. Keep a receipt and note the business use percentage.

Q: What if I miss a quarterly estimated tax payment?

A: You may face a penalty. The IRS charges interest on underpayments. File Form 2210 to see if you qualify for a waiver. Pay as soon as possible to minimize penalties.

Q: Should I form an LLC or S-corp for tax savings?

A: It depends on your income. Many solo attorneys benefit from S-corp status once net income exceeds $40,000-$50,000, as it can reduce self-employment tax. However, S-corps require payroll and additional compliance. Consult a tax advisor.

Q: How long should I keep records?

A: Keep tax records for at least 3 years, but for real estate and long-term assets, keep for 7 years. Store digital copies securely.

The bottom line

Your first year as a solo attorney is a learning curve, but tax mistakes can be avoided with a little planning. Set up separate accounts, pay estimated taxes, track expenses, and consult a professional. These steps will save you money and stress. Start today, and you’ll be in good shape come tax season.