How to Convert a Sole Proprietorship to an LLC

How do I convert a sole proprietorship to an LLC? To convert a sole proprietorship to an LLC, choose a state, register an available business name, file articles of organization with the Secretary of State, get a new EIN from the IRS, draft an operating agreement, open a new business bank account in the LLC’s name, transfer assets and contracts, update licenses and permits, and file the BOI report with FinCEN within 90 days.

The move to convert a sole proprietorship to an LLC is one of the most common upgrades a small business owner makes. The reasons: growing liability exposure, the need to hire employees, larger customer contracts that require a real entity, or simply outgrowing the simplicity of running everything through your personal name. This guide walks through every step of the conversion, the costs, the tax implications, and the mistakes that derail otherwise-clean transitions.

When to Convert

Common signals it is time to move from sole proprietor to LLC:

Annual revenue passes $25,000–$50,000 and is climbing
You are about to hire your first employee
You signed (or are negotiating) a contract that requires a registered entity
You took on a commercial lease or significant debt
Your business has any meaningful liability exposure (physical product, customer interaction, regulated industry)
You want to qualify for an SBA loan or business credit line
You are bringing on a partner or investor

The full comparison is in our guide on LLC vs sole proprietorship.

Step-by-Step: Converting From Sole Proprietorship to LLC

Choose your state of formation. Almost always your home state — the state where you actually operate.
Pick a unique business name. Search your state’s database. If your sole-prop trade name is available as an LLC name, you can keep it. See how to register a business name.
Choose a registered agent. Either yourself (with your home or business address listed publicly) or a paid registered agent service ($50–$300/year).
File articles of organization. Online through your state’s Secretary of State. Pay the state filing fee ($50–$500).
Apply for a new EIN. Even if you had an EIN as a sole proprietor, you need a new one for the LLC. Apply free at IRS.gov.
Draft an operating agreement. See LLC operating agreement guide. Even a single-member LLC needs one.
Open a new business bank account in the LLC’s name. See business bank account for an LLC.
Transfer assets to the LLC. Document the transfer of business equipment, inventory, intellectual property, and contracts. Sign a written bill of sale or contribution agreement.
Update licenses, permits, and registrations. Cancel the sole prop license (or transfer if the state allows) and apply for licenses in the LLC’s name. Update your sales tax permit. See how to get a business license.
Notify customers and vendors. Provide a written notice that future contracts and invoices will be in the LLC’s name.
File the BOI report with FinCEN. Within 90 days of LLC formation.
Update insurance policies. The LLC is now the named insured; your personal policies no longer cover business activity.
File a final Schedule C for the year of the conversion, showing income up to the conversion date.

Total Cost to Convert

Item	Cost
State LLC filing fee	$50 – $500 (one-time)
EIN	$0
Registered agent (optional)	$50 – $300/year
Operating agreement (DIY template)	$0 – $50
Bank account opening	$0 – $25 first deposit
New business license (LLC)	$50 – $400
Insurance policy update	$0 – $200 (usually no charge to re-issue)
Attorney review (optional)	$200 – $1,000

Total typical first-year cost: $200–$1,500, with ongoing annual costs of $100–$800 for state annual reports and franchise taxes. See state-by-state details at how much it costs to start an LLC.

Tax Implications of the Conversion

For a single-member LLC taxed as a sole proprietorship (the default), the tax filing barely changes — you keep filing Schedule C with your personal return. The new EIN is just for the LLC’s business activities; you continue reporting on Schedule C up to the conversion date, then start a new Schedule C for the LLC’s activity. Some practical points:

No federal tax event. Transferring assets to your own single-member LLC is not a sale or distribution.
Year-of-conversion split. You may file two Schedule Cs in the conversion year — one for the sole prop pre-conversion, one for the LLC post-conversion. The IRS accepts this.
Self-employment tax stays the same. Single-member LLCs taxed as sole props still pay the full 15.3% self-employment tax on net profit.
S-corp election available. Once the LLC is formed, file Form 2553 with the IRS to elect S-corp tax treatment if profits justify it. The form must be filed within 2.5 months of the start of the tax year for which the election should apply.
Sales tax account update. Notify your state revenue department of the entity change so the sales tax permit transfers cleanly.

Asset and Contract Transfer

Document everything you move from sole prop to LLC. A simple written bill of sale or contribution agreement covers:

Equipment, computers, furniture (list each with approximate fair market value)
Inventory and supplies
Intellectual property (trademarks, copyrights, domain names)
Customer contracts (may require customer consent to assign)
Vendor agreements (may require vendor consent)
Outstanding accounts receivable
Outstanding accounts payable
Bank balances (transferred via wire or check to the new business account)

Some contracts have “anti-assignment” clauses that prohibit transfer without the other party’s written consent. Read every meaningful contract before transferring and reach out for consent where needed.

Customer and Vendor Notifications

A short written notice (email is fine) to every active customer and vendor:

“Effective [date], [Sole Prop Trade Name] has been formed as a Limited Liability Company under the name [LLC Name]. All future contracts, invoices, and payments will be made in the LLC’s name. Our EIN, bank account, and contact information have been updated. Please update your records and address future payments to [LLC Name] at [new bank info or address].”

Send the notice 30 days before the change so vendors can update their payment systems.

Common Conversion Mistakes

Forgetting to get a new EIN. The LLC needs its own EIN — the sole prop EIN does not transfer.
Co-mingling pre- and post-conversion finances. Transfer the bank balance with a formal documented transaction.
Skipping the operating agreement. Single-member LLCs still need one; otherwise liability protection weakens.
Forgetting the BOI report. 90-day deadline; penalties up to $591 per day late.
Not updating insurance. The LLC needs to be the named insured.
Not transferring licenses. Operating with a license still in the sole prop name can void it.
Continuing to use sole prop letterhead. Every invoice, business card, and email signature should now use the LLC name with the “LLC” designator.
Not notifying customers. Existing contracts technically belong to the sole prop until assigned to the LLC.

What to Do With the Old Sole Proprietorship

The sole proprietorship does not need formal dissolution — it simply ceases operating. To wind it down cleanly:

Stop using the sole prop trade name in business activity.
Cancel the DBA filing (if you do not want to keep it as a brand under the new LLC).
Close the sole prop bank account after transferring the balance.
Surrender or transfer business licenses to the LLC.
File final state sales tax returns and close the sole prop sales tax account.
File a final Schedule C for the year of conversion.
Keep all sole prop records for 7 years (the IRS audit window).

Tax Year Strategy

Most owners convert at year-end or quarter-end to simplify tax reporting. A January 1 conversion is the cleanest because all sole prop activity falls in the prior year, and all LLC activity falls in the new year. Mid-year conversions are fine but require two Schedule Cs and careful tracking of which transactions belong to which entity. For broader guidance on switching business structures, see the IRS business structures page.

Documents You Need During Conversion

Articles of organization (filed and stamped)
EIN confirmation letter (CP 575) for the new LLC
Operating agreement (signed)
Bill of sale or contribution agreement for transferred assets
New business bank account documents
New business licenses in the LLC’s name
Updated sales tax permit
Updated insurance policies
Customer and vendor notifications (saved as PDF for your records)
BOI report confirmation from FinCEN

The complete list is in our documents you need to start a business guide.

Should You Hire a Lawyer?

Not for most simple single-owner conversions. The forms are all available online, the state walks you through formation, and template operating agreements handle the legal documentation. Hire a lawyer when: you have employees being absorbed by the LLC, you have multi-year contracts that need formal assignment, you are bringing in partners as part of the conversion, the business owns real estate, or you operate in a regulated industry. A 1-hour consultation with a small business attorney usually costs $200–$400 and resolves most edge cases.

How Long Does Conversion Take?

The state filing usually returns the LLC formation in 1–10 business days (instant in some states like Delaware and Wyoming when paying expedited fees). EIN is instant online. Operating agreement, bank account, asset transfer, and notifications take another 2–4 weeks. Most conversions are fully complete in 4–6 weeks if you start with all your documents ready.

Common Scenarios After Conversion

Hiring your first employee: Now that you are an LLC, register with your state’s employer tax agency, get workers’ compensation insurance, and pick a payroll provider. The LLC’s EIN, not your SSN, goes on every payroll form.
Taking on a partner: Amend the operating agreement to add the new member with their ownership percentage and capital contribution. The LLC automatically becomes a multi-member LLC for federal tax purposes and starts filing Form 1065.
Applying for a loan: Lenders see the LLC as a more legitimate borrower than a sole prop. SBA loans, business credit cards, and lines of credit all become easier to qualify for.
Buying business equipment: Now financed in the LLC’s name, with the LLC building credit history rather than relying on the owner’s personal credit.
Signing a commercial lease: The landlord names the LLC as the tenant. The owner typically still provides a personal guarantee, but the LLC structure isolates other business assets from the lease.

Maintaining the LLC’s Liability Shield After Conversion

The benefit of converting is lost if you continue operating the LLC the way you operated the sole proprietorship. Maintain the liability shield by: using the LLC name on every customer-facing document, depositing every dollar of revenue into the LLC bank account (not your personal account), paying yourself only through documented owner draws or payroll, signing contracts with “[Your Name], Member of [LLC Name]” rather than your name alone, and keeping the operating agreement current with any ownership or management changes. These habits are simple but essential — they are what makes the LLC a real entity in the eyes of a court.

Frequently Asked Questions

Do I need a new EIN when converting from a sole proprietorship to an LLC?

Yes. The IRS treats the LLC as a new entity for tax purposes, even though you are the sole owner. Apply for a new EIN at IRS.gov immediately after the state confirms your LLC formation.

Will my taxes go up after converting?

By default, no — a single-member LLC is taxed as a sole proprietorship, so your federal tax filing barely changes. State franchise taxes and annual report fees add $50–$800 per year. Electing S-corp treatment later can actually reduce your total tax burden once profits exceed $80,000.

What happens to my sole proprietorship’s debts after I form an LLC?

They stay with you personally. The LLC does not automatically assume debts incurred before formation. You can have the LLC formally assume them via a written agreement, but creditors must consent — and most do not, because they prefer the broader liability of the individual owner.

Timing Tip: Plan Around Tax Season

If your conversion falls anywhere near year-end, plan deliberately. A January 1 conversion is simplest because the entire prior year is sole prop and the entire new year is LLC. A December conversion forces you to split the year on Schedule C and complicates state tax filings. If a January conversion is not practical, aim for the start of a quarter (April 1, July 1, October 1) so quarterly estimated payments align with the new entity’s start date.

Next steps: see how to write an operating agreement, then open a business bank account in the LLC’s name.