Business Entity Conversion Cost for Law Firms: What to Know
Executive Summary & Key Points
The Big Picture
Is your law firm operating under the right business structure? The entity you chose when you opened your doors may not be the best fit today. As your firm grows, changing your legal structure or tax classification could help you reduce taxes, improve owner compensation, or prepare for future growth.
But what does that change actually cost? The true business entity conversion cost goes beyond filing fees. Legal services, CPA fees, payroll, tax returns, and ongoing compliance can all affect what you pay. Before changing from an LLC to a corporation, forming a PLLC, or electing S-Corp tax treatment, you need to understand the full financial impact.
The Cheat Sheet
- Not all entity changes are the same. Changing your legal structure is different from changing how your business is taxed.
- Filing fees are only one expense. Attorney fees, CPA services, payroll setup, and ongoing compliance can increase the total cost.
- Tax savings depend on your numbers. An S-Corp election may reduce certain taxes, but the savings must outweigh the added expenses.
- Law firms have special requirements. State bar rules can affect which structures attorneys may use and how ownership changes are handled.
- The best structure supports growth. Compare one-time costs, annual expenses, tax savings, and long-term goals before making a decision.
Are your law firm's finances truly aligned with your goals — or just keeping you busy?
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The Business of Law: Is Your Entity Still Working for You?
When you started your law firm, your main goal was probably simple: open your doors and start serving clients.
You may have formed an LLC, PLLC, or professional corporation based on advice from an attorney or another business owner. At the time, you may not have thought much about how that choice would affect your future taxes.
But your business looks different today.
Maybe you have hired employees, added another attorney, or increased your annual revenue. You may also be taking home more money while paying more in taxes.
That often leads to an important question:
Would changing my business structure help me save money?
The answer depends on your firm’s financial position.
Your business entity affects how income is taxed, how owners are paid, what records you must keep, and which state rules apply.
For example, a solo attorney may benefit from S-Corp taxation once the firm’s profits are high enough to support reasonable owner wages and added compliance costs. Another firm may gain little from changing its current structure.
The goal is not simply to find the entity with the lowest tax rate. It is to choose a structure that supports your firm’s finances and future growth.
Understanding your business entity conversion cost is the first step.
What Is Business Entity Conversion?
Why It Matters
Before you calculate the cost of changing your business entity, you need to understand what is actually changing.
Many business owners use the terms LLC, PLLC, PC, S-Corp, and C-Corp as if they all mean the same thing.
They do not.
Some describe your legal business structure. Others describe how your business is taxed.
How It Works
Limited Liability Company (LLC)
An LLC is a legal business structure formed under state law.
It generally provides protection from certain business debts and liabilities. However, it does not protect attorneys from their own professional malpractice.
For federal taxes, a single-member LLC is generally treated as part of its owner’s tax return unless another classification is elected. A multi-member LLC is generally taxed as a partnership unless it elects otherwise.
Professional Limited Liability Company (PLLC)
A PLLC is a type of LLC available to certain licensed professionals.
Some states require or permit attorneys to use professional entities. PLLCs may have special rules for ownership, licensing, and registration.
Professional Corporation (PC)
A PC is a corporation formed for licensed professionals.
Depending on eligibility and tax elections, a PC may be taxed as a C-Corp or an S-Corp.
S-Corporation (S-Corp)
An S-Corp is a federal tax classification, not a separate legal entity.
An eligible LLC, PLLC, or corporation may elect S-Corp taxation without necessarily changing its underlying legal structure.
This distinction matters when calculating your business entity conversion cost. A tax election may be much simpler than a legal conversion.
C-Corporation (C-Corp)
A C-Corp is a federal tax classification commonly used by corporations that have not elected S-Corp treatment.
A C-Corp generally pays federal income tax at the business level. Shareholders may also pay taxes when profits are distributed as dividends.
Common Entity Changes for Law Firms
| Entity change | What changes? |
| LLC to S-Corp taxation | Federal tax treatment, payroll, and tax reporting |
| PLLC to S-Corp taxation | Federal tax treatment while keeping the PLLC |
| LLC to corporation | Legal structure and possibly tax treatment |
| LLC to PLLC | Professional entity status and state requirements |
| PC taxed as a C-Corp to S-Corp | Federal tax classification |
| S-Corp to C-Corp taxation | Federal tax treatment and future obligations |
Not every state allows every type of conversion. Some changes may require forming a new entity rather than filing a simple conversion.
CPA Pro Tip
Do not pay to change your legal entity if a tax election can accomplish your goal. An eligible LLC or PLLC may already have the legal structure it needs. Review your current entity and federal tax classification before paying for unnecessary legal filings.
What Is the Total Business Entity Conversion Cost for Law Firms?
The total business entity conversion cost depends on the type of change, your state, and your firm’s needs. Costs may include filing fees, legal services, CPA fees, payroll setup, and ongoing tax compliance. Some changes only require a federal tax election, while others involve forming or converting a legal entity.
Why It Matters
Many business owners search for the cost of changing an LLC to an S-Corp, PC, or PLLC and find a state filing fee.
That fee rarely tells the whole story.
Your total cost may include several one-time expenses and new annual costs.
How It Works
State Filing Fees
States charge different fees depending on the type of entity and the documents required.
For example, Florida lists the following filing fees:
| Florida filing or requirement | Published fee |
| Forming a new LLC, including required registered agent designation | $125 |
| Forming a new corporation, including required registered agent designation | $70 |
| LLC certificate of conversion | $25 plus new entity filing fees, if applicable |
| Corporation certificate of conversion | $35 plus new entity filing fees, if applicable |
| LLC annual report | $138.75 |
| For-profit corporation annual report | $150 |
These are state filing fees, not the total cost of a legal conversion. Professional entity requirements and other charges may apply.
You can review the current fees through the Florida Department of State’s official fee schedule.
Attorney Fees
Legal support may be needed to:
- Review professional licensing requirements.
- Prepare conversion or formation documents.
- Update ownership and operating agreements.
- Review existing contracts.
- Confirm compliance with state bar rules.
A simple tax election may need limited legal work. A conversion involving multiple owners or a new professional entity may require much more.
CPA and Tax Planning Fees
Your CPA should review the tax impact before you change your structure.
This may include reviewing profits, owner compensation, projected taxes, and the cost of operating under the new classification.
Your CPA may also need to prepare tax elections, coordinate payroll, or help update financial records.
Payroll Setup
If your law firm elects S-Corp taxation, an owner who works in the business generally must receive reasonable compensation through payroll.
If you do not already have payroll, this creates a new operating expense.
Accounting and Bookkeeping Changes
Your books may need adjustments to track owner wages, distributions, equity, and taxes correctly.
For law firms, these changes must be handled without disrupting client trust accounting.
One-Time vs. Ongoing Entity Conversion Costs
| Expense | One-time or ongoing? |
| State conversion or formation fees | Usually one-time |
| Legal documents and review | Usually one-time |
| CPA tax analysis | Usually one-time |
| Tax election preparation | Usually one-time |
| Payroll setup | Usually one-time |
| Payroll processing | Ongoing |
| Additional business tax returns | Ongoing |
| State annual reports | Ongoing |
| Accounting adjustments | Either |
An eligible business generally does not pay an IRS filing fee simply to submit Form 2553 for S-Corp taxation. However, professional preparation, payroll, and tax compliance can still add to the overall cost.
CPA Pro Tip
Ask for two estimates before changing your business structure: what it costs to make the change and what it costs to maintain the new structure every year.
The ongoing cost matters because it affects your firm’s cash flow long after the conversion is complete.
Still guessing whether your numbers are telling the full story?
We’ll walk through your systems together and identify what needs to be connected, cleaned up, or improved.
Can Changing Your Business Structure Save You Money on Taxes?
Why It Matters
One of the main reasons law firm owners consider changing entities is to reduce their tax bill.
That can be a good reason to review your structure, but lower taxes do not always mean more money in your pocket.
You must compare the potential savings with the full cost of the change.
How It Works
S-Corp Taxation and Owner Compensation
For some profitable law firms, S-Corp taxation can reduce certain employment taxes.
A sole proprietor generally pays self-employment tax on eligible business earnings.
An S-Corp treats owner compensation differently.
An attorney who works in the firm generally receives reasonable wages subject to payroll taxes. Remaining eligible profits may be distributed without being subject to self-employment tax in the same way.
However, S-Corp distributions are not automatically free from federal income tax.
The IRS requires reasonable compensation for shareholder-employees before non-wage distributions.
Example: A Profitable Solo Law Firm
Imagine a solo attorney whose firm earns $180,000 in annual profit before owner compensation and additional S-Corp costs.
After reviewing the attorney’s duties, experience, and market compensation, a tax advisor determines that $110,000 is reasonable annual compensation.
The remaining profit may create an opportunity for tax savings, but the calculation must also account for employer payroll taxes, added operating costs, and other tax rules.
The $70,000 difference between the initial profit and wages is not automatically the amount of tax savings or the final amount available for distributions.
The Cost of Additional Compliance
S-Corp taxation may create new requirements, including:
- Running payroll for working owners.
- Filing employment tax returns.
- Preparing Form 1120-S each year.
- Tracking shareholder basis and distributions.
- Following state tax rules.
These costs reduce the net benefit of the election.
C-Corp Taxation
A C-Corp may make sense for certain businesses, but it has different tax rules.
The corporation generally pays income tax on its profits. Shareholders may also pay taxes when those profits are distributed as taxable dividends.
This can make C-Corp taxation less attractive for some small professional service firms.
Qualified Business Income Deduction
Your business structure may also affect the Qualified Business Income (QBI) deduction.
Law firms are generally considered specified service trades or businesses. This means the deduction can be limited or unavailable at higher taxable income levels.
An S-Corp election does not guarantee a QBI deduction.
CPA Pro Tip
Do not assume every profitable law firm should elect S-Corp taxation. The best decision comes from a tax projection using your actual financial reports.
Your firm’s profit, reasonable owner compensation, other income, and annual compliance costs all affect the answer.
What Legal and State Filing Fees Come With Entity Conversion?
Why It Matters
Law firms have professional requirements that many other businesses do not.
Even if a certain entity offers tax benefits, it may not be permitted under your state’s rules for practicing law.
These rules can affect both your legal options and your business entity conversion cost.
How It Works
Professional Licensing Requirements
Some states have special requirements for attorneys operating through professional entities.
These may include rules about:
- Who can own an interest in the firm.
- Which entity names are allowed.
- Whether professional registration is required.
- How ownership changes must be approved.
- What happens when an owner loses a professional license.
Business Registration
A legal conversion may require new state filings, registration updates, or changes to business records.
If your law firm operates in multiple states, you may also need to review registration and tax requirements in each state.
Contracts and Banking
Depending on the type of change, you may need to review:
- Office leases.
- Vendor agreements.
- Insurance policies.
- Business bank accounts.
- Employer identification number requirements.
- Client engagement agreements.
Not every conversion requires new accounts or contracts. A tax election alone often leaves the legal entity unchanged.
Trust Accounting Requirements
If your firm handles client trust funds, an entity change requires extra care.
Client trust money must remain separate from operating funds.
Before changing your entity, confirm whether your trust account title, bank records, bar registration, or accounting system needs updating.
If you use Clio and QuickBooks Online, coordinate any changes so your client ledgers, trust balances, and reconciliations remain accurate.
CPA Pro Tip
Never let an entity conversion interrupt trust accounting compliance.
Coordinate with your attorney, CPA, and bank before making changes to accounts or ownership records. Your monthly three-way trust reconciliations should continue without gaps.
When Is Changing Your Law Firm’s Business Structure Worth It?
Why It Matters
The cheapest entity is not always the best entity.
A growing law firm may benefit from a structure that costs more to maintain if the tax savings or other benefits justify the expense.
But changing entities without a clear reason can create unnecessary work.
How It Works
Here are several situations when reviewing your entity may make sense.
Your Profits Have Increased
A firm earning significantly more than it did at startup may benefit from reviewing its tax classification.
You Are Adding Another Owner
Bringing in a partner can affect ownership agreements, professional rules, and tax reporting.
You Are Changing How You Pay Yourself
Owner draws, wages, distributions, and guaranteed payments have different tax treatment.
You Are Expanding Into Another State
Growth across state lines may create new registration and tax obligations.
Your Current Structure Is Too Expensive
Sometimes the best change is moving away from a structure that no longer provides enough value to justify its ongoing costs.
Example: Is the Conversion Worth It?
Suppose your CPA projects that changing your tax classification could save your law firm $7,000 annually.
The new structure also creates $2,500 in additional annual costs.
| Financial impact | Amount |
| Projected annual tax savings | $7,000 |
| Additional annual expenses | -$2,500 |
| Estimated annual net benefit | $4,500 |
| One-time conversion and setup costs | -$3,000 |
| Estimated first-year net benefit | $1,500 |
This is a hypothetical example, not a guaranteed result or a quote for professional services.
This comparison gives you a clearer picture of the potential value.
Even when tax savings are possible, you still need to consider legal requirements, timing, and future growth.
CPA Pro Tip
Review your entity when your profits, ownership, or business goals change.
You do not need to convert every time your revenue increases. Regular tax planning can help you identify when a change is worth considering.
How to Change Your Law Firm’s Business Entity
Why It Matters
Even when a change makes financial sense, poor timing or incomplete records can create problems.
A smooth transition requires planning between your CPA, business attorney, payroll provider, and internal team.
How It Works
Step 1: Confirm Your Current Structure
Determine how your law firm is legally formed and how it is currently taxed.
Do not assume your entity name tells you everything about your federal tax classification.
Step 2: Review Your Financial Reports
Your CPA should review your profit and loss statement, balance sheet, owner payments, and recent tax returns.
Accurate books are essential for a reliable tax projection.
Step 3: Compare Your Options
Estimate the business entity conversion cost for each available option.
Include filing fees, professional services, payroll, taxes, and ongoing compliance.
Step 4: Check Legal Requirements
Have a qualified attorney review state bar rules, ownership restrictions, and any required documents.
Step 5: Plan the Effective Date
Tax elections have deadlines.
For example, the IRS generally requires Form 2553 to be filed no later than two months and 15 days after the beginning of the tax year in which an S-Corp election is intended to take effect.
Certain late-election relief may be available.
Review the IRS instructions for Form 2553 for current eligibility and timing requirements.
Step 6: Update Your Financial Systems
Coordinate payroll, bookkeeping, tax reporting, and any required registration or banking changes.
If your firm uses Clio and QuickBooks Online, make sure the transition does not disrupt client trust records.
CPA Pro Tip
Plan before you file.
A year-end tax review can help determine whether a change should take effect in the following year. However, some legal conversions and tax elections require more lead time.
Waiting until tax season may limit your options.
Additional Considerations: The Costs Law Firm Owners Often Miss
The business entity conversion cost is not just about what you pay to make a change.
It also includes the opportunities you may miss by choosing the wrong structure or failing to plan ahead.
1. State Taxes Can Change the Outcome
Federal tax savings are only part of the calculation.
Some states impose franchise taxes, entity-level taxes, or special filing requirements.
A change that looks beneficial on a federal tax projection may offer less value after state taxes are included.
2. Retirement Contributions May Be Affected
Your entity and compensation structure can affect how retirement plan contributions are calculated.
For S-Corp owners, W-2 compensation generally plays an important role in determining eligible retirement contributions.
Reducing wages without reviewing your retirement plan may create unintended consequences.
3. Health Insurance Requires Special Treatment
Health insurance benefits for certain S-Corp shareholders have special tax reporting rules.
Your CPA and payroll provider should coordinate how eligible owner health insurance is handled.
4. Old Tax Issues Do Not Disappear
Changing your entity does not automatically eliminate unpaid taxes, prior filing requirements, or existing obligations.
Certain conversions can also trigger taxable gains or other consequences depending on the firm’s assets, liabilities, and ownership.
5. Your Books May Need Cleanup
If your balance sheet is inaccurate or owner payments are recorded incorrectly, you may not have the information needed to make a sound decision.
Cleaning up your books before changing structures can help prevent costly errors.
6. Timing Can Increase Costs
A midyear change may require additional accounting work, separate tax reporting periods, or payroll adjustments.
Planning a future effective date may make the transition simpler.
7. The Best Opportunity May Be Keeping Your Current Entity
Sometimes the smartest move is not to convert at all.
Better owner compensation planning, stronger bookkeeping, quarterly tax projections, or a more effective retirement strategy may create value without changing your legal entity.
The goal is to improve your firm’s financial position, not simply to create a new business structure.
Frequently Asked Questions
Q: How much does it cost to change my law firm’s business entity?
A: The total business entity conversion cost depends on your state, current structure, and the type of change. Expenses may include state filing fees, attorney fees, CPA services, payroll setup, and ongoing compliance. A tax election can be much simpler than a legal conversion.
Q: Is it cheaper to convert an LLC to an S-Corp or a PLLC?
A: These changes serve different purposes. An S-Corp election changes federal tax treatment, while a PLLC is a legal structure for licensed professionals. An eligible LLC may elect S-Corp taxation without legally converting, but PLLC requirements depend on state law.
Q: Can my law firm become an S-Corp without changing its LLC or PLLC?
A: Yes. An eligible LLC or PLLC may elect S-Corp taxation while keeping its current legal structure. The firm must meet IRS eligibility rules and applicable state professional requirements. Learn more in our Solo Attorney’s Guide to Business Structures.
Q: Will converting my law firm to an S-Corp lower my taxes?
A: It may reduce certain employment taxes if your firm has enough profit after reasonable owner compensation and added costs. However, S-Corp taxation also creates payroll and reporting obligations. A tax projection is the best way to determine whether the savings justify the expense.
Q: What is the difference between a PC and a PLLC for attorneys?
A: A PC is a professional corporation, while a PLLC is a professional limited liability company. Both may be available to licensed attorneys, depending on state law. Their ownership rules, formation requirements, and tax classifications can differ.
Q: When should I consider changing my law firm’s entity?
A: Review your entity when profits increase, you add owners, expand into new states, or change your long-term goals. You should also review your structure if you have not evaluated your tax strategy in several years. Regular financial reporting helps identify when a change may be worthwhile.
Q: Can I change my business entity without getting a new EIN or opening new bank accounts?
A: Sometimes. An S-Corp election alone generally does not require an existing eligible LLC to obtain a new EIN or open new bank accounts. A legal conversion or formation of a new entity may have different requirements, so confirm the details before making changes.
Conclusion: Make Entity Decisions Based on Numbers, Not Guesswork
Changing your law firm’s business structure can be a valuable financial decision, but it should never be based on filing fees or tax-saving claims alone.
The true business entity conversion cost includes legal work, tax planning, payroll, accounting changes, and ongoing compliance.
For some attorneys, an S-Corp election may create meaningful tax savings. For others, a PLLC, PC, or existing structure may be the better fit.
What matters is understanding how each option affects your taxes, cash flow, owner compensation, and future growth.
Strong financial systems make these decisions easier.
When your books are accurate and your tax planning is proactive, you can compare your options with confidence.
Your business entity should support the law firm you are building, not create unnecessary costs along the way.
Ready to Find Out Whether Your Law Firm Has the Right Entity Structure?
At Aligned CPA, we specialize in accounting, tax planning, and financial advisory services for solo and small law firms.
We help attorneys understand their numbers, identify tax-saving opportunities, plan owner compensation, and build financial systems that support long-term growth.
Whether you are considering an S-Corp election, reviewing your current entity, or planning your firm’s next stage of growth, we can help you evaluate the financial impact before making a decision.
Schedule a discovery consultation with Aligned CPA to see how proactive tax planning and stronger financial systems can help your law firm.
Ready to stop reacting and start running your firm intentionally?
Schedule a consultation and begin building a financial system that supports profit, compliance, and long-term growth.
Joy Lutz, CPA, CTP
I help our client’s keep more money in their pockets by implementing proactive tax strategies.
I promise you, working with a CPA and Certified Tax Planner can be much more exciting than crunching numbers and reviewing last year’s taxes.
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