How to Start a Tax Preparation Business in Illinois

Illinois has no state tax preparer license, but that does not mean you can operate without oversight. The Illinois Department of Revenue regulates tax preparers through the State Tax Preparer Oversight Act (35 ILCS 35), monitoring practitioners by their federal Preparer Tax Identification Number (PTIN). Starting a tax preparation business in Illinois means building a foundation around federal compliance, proper business registration, and professional preparation for client relationships and tax filing obligations.

This guide walks through the exact steps to become a tax preparer in Illinois, from credentials and business structure to regulatory compliance and your first filing season.

Step 1: Determine Your Credentials and Professional Path

How to become a tax preparer in Illinois begins with a choice about your professional standing. The state recognizes several credential types, each carrying different responsibilities and client service boundaries.

Tax Preparer Credential Options

• Registered Tax Return Preparer (RTRP): The IRS RTRP program was discontinued after federal courts ruled in 2013 and 2014 that the IRS could not require it. The current voluntary option for non-credentialed preparers is the IRS Annual Filing Season Program (AFSP) Record of Completion, earned through annual continuing education.
• Certified Public Accountant (CPA): The full license, requiring education, exam passage, experience, and state licensure through the Illinois Department of Financial and Professional Regulation. A CPA can perform all tax preparation services and may also offer audit, consulting, and accounting services. CPA licensing is a separate process from tax preparer registration and is not required to prepare taxes.
• Enrolled Agent (EA): The federal credential from the IRS, signifying expertise in tax matters. An Enrolled Agent may represent clients before the IRS and is not state-licensed.
• Unlicensed Preparer: A person without the above credentials may prepare tax returns for others, but must hold a valid federal PTIN, follow IRS preparer rules, and include the PTIN on Illinois returns under the State Tax Preparer Oversight Act.

Most first-time tax prep business owners begin as unlicensed preparers, often with an AFSP Record of Completion, then advance credentials as their practice grows and they can justify the additional study and examination costs.

Step 2: Obtain Your Federal Preparer Tax Identification Number (PTIN)

A PTIN is mandatory for any individual who is paid to prepare federal tax returns or refund-related documents. In Illinois, the Department of Revenue uses your PTIN to oversee your practice under the state tax preparer oversight law.

PTIN Application Process

1. Create an IRS account online: Visit irs.gov and create a login through the IRS Online Services portal. You will need your Social Security Number, date of birth, and a valid email address.
2. Complete Form W-12: This is the Application for a Preparer Tax Identification Number. You can file it online through the IRS portal or print and mail it to the IRS address listed on the form.
3. Pay the application fee: The IRS charges a PTIN fee that changes over time. Confirm the current fee on irs.gov before you apply.
4. Receive your PTIN: If you apply online, your PTIN typically issues within 24 hours. Mail applications take two to three weeks.
5. Maintain your PTIN: You must renew your PTIN annually, usually in October. The renewal deadline is typically December 31 of each year for the following year. Failure to renew suspends your ability to prepare and sign returns.

Illinois tax return preparers are identified in the state's regulatory system by their PTIN. Do not share your PTIN with others, and do not allow unlicensed individuals to prepare returns under your PTIN.

Step 3: Obtain an Electronic Filing Identification Number (EFIN) from the IRS

An EFIN allows you to electronically file tax returns with the IRS. Most modern tax preparation practices operate electronically for speed, accuracy, and compliance. Without an EFIN, you can only prepare paper returns, which significantly limits your competitiveness.

EFIN Application Process

1. Have your PTIN in hand: You must already hold a valid PTIN before requesting an EFIN.
2. Visit irs.gov and navigate to EFIN registration: The IRS provides a dedicated portal for EFIN applications. You can also contact the IRS e-Services call center at 866-255-0654.
3. Complete the EFIN application: Provide your business address, business structure (sole proprietorship, LLC, corporation, etc.), and business information. The address you list is where IRS correspondence will be sent.
4. Designate Responsible Officials: If your business is an LLC or corporation, you must name one or more responsible officials who are authorized signers for electronically filed returns.
5. Confirm your credentials: The IRS verifies your PTIN and credentials and runs a suitability check before issuing the EFIN. Processing can take up to 45 days, and principals without a professional credential must be fingerprinted.
6. Receive your EFIN: Once approved, you will receive your EFIN by mail at the address you provided. You then register with approved e-filing software to begin filing returns electronically.

Keep your EFIN and associated credentials confidential. Your EFIN is tied directly to your business identity with the IRS, and misuse can result in suspension or revocation.

Step 4: Choose a Business Structure and Register in Illinois

You must decide on a legal business structure (sole proprietorship, LLC, corporation, or partnership) and register appropriately with the state. Illinois has no single statewide business license, so registration requirements depend on your structure and activities.

Business Structure Options

• Sole Proprietorship: You operate the business as yourself with no separate legal entity. File an assumed business name certificate with the county clerk in each county where you operate if you use a business name other than your own, and publish notice for 3 consecutive weeks. County fees vary (Cook County charges $50). You pay personal income tax (4.95% flat Illinois rate) on net business profit.
• Limited Liability Company (LLC): A separate legal entity that protects personal assets. Filing fee is $150 with standard 10 business day processing, or $250 for 24 hour service. Annual report fee is $75 each year. LLCs taxed as partnerships pay 1.5 percent personal property replacement tax on net income.
• Sole Proprietor with an Assumed Name: If you use a business name, you file the assumed business name certificate with your county clerk (Form LLC-1.20 at the Secretary of State is only for LLCs). This is the most affordable option but offers no liability protection.

Illinois Department of Revenue Registration

1. Register for a tax ID number: Visit the Illinois Department of Revenue website (tax.illinois.gov) and access MyTax Illinois. Complete Form REG-1 (Unified Registration). This is free and processes in one to two business days online or four to six weeks by mail.
2. Determine if you need a sales tax permit: If your tax prep services include business tax consulting or other services that might be taxable, you may need a sales tax permit. Confirm with IDOR whether your specific services trigger this requirement.
3. File your business tax return: Once registered, you will receive a certificate of registration. Keep this with your business records.

Step 5: Understand Illinois Tax Preparer Oversight Requirements

The Illinois State Tax Preparer Oversight Act (35 ILCS 35) creates specific rules for anyone preparing tax returns in the state. Even though Illinois has no separate state tax preparer license, the state actively oversees preparers through PTIN registration and conduct standards.

Key Oversight Requirements

• PTIN Registration: Your federal PTIN is your identifier in the state system. IDOR tracks preparers by PTIN to enforce compliance.
• Professional Conduct Standards: IDOR may investigate any income tax return preparer and, after a hearing, bar or suspend a preparer from filing returns with the Department for good cause. Failing to include your PTIN on an Illinois return carries a $50 civil penalty per offense, up to $25,000 per calendar year.
• Client Records and Engagement Letters: Maintain clear engagement letters with clients that outline fees, services, and responsibilities. Keep client tax documents for a minimum of three years after filing.
• Accuracy and Due Diligence: Illinois preparers are held to the same accuracy standards as preparers in all states. Knowingly preparing false returns or assisting with tax evasion is a felony in Illinois.

Step 6: Set Up Your Business Operations and Client Systems

With credentials and registration in place, you are ready to build the operational side of your tax prep business.

Essential Setup Tasks

1. Choose tax preparation software: Select IRS-approved e-filing software (such as ProSeries, TaxAct Professional, Lacerte, or others). These integrate with your EFIN and handle electronic filing, compliance checks, and documentation. Budget $500 to $3,000 per year depending on client volume and features.
2. Open a business bank account: Separate personal and business finances. Most Illinois banks offer basic business checking accounts. Bring your EIN (if you formed an LLC or corporation), PTIN, and state registration documents.
3. Get professional liability insurance: Errors and omissions (E&O) insurance protects your practice if a client sues over a preparation error. Annual premiums typically run $1,000 to $3,000 depending on revenue and claims history.
4. Create client intake and engagement processes: Document exactly what you collect from clients, when you need it, and how you communicate updates. Use checklists to ensure nothing is missed.
5. Set up a secure document storage system: Client tax information is sensitive personal data. Use encrypted storage (cloud or on-site) and never leave documents unattended. Comply with IRS regulations on data security and record retention.
6. Establish fee schedules and pricing: Decide whether you charge flat fees, hourly rates, or tiered fees based on return complexity. Document your pricing and communicate it clearly in engagement letters.

Step 7: Build Your Client Base and Marketing

With the legal and operational foundation in place, focus on attracting and retaining clients.

Marketing and Client Acquisition

• Create a simple website: A basic website (even a single page) with your name, services, contact information, and hours builds credibility. Mention your PTIN status and any credentials (AFSP, EA, CPA) clearly.
• Develop referral relationships: Partner with accountants, bookkeepers, financial advisors, and small business consultants in your area. Many refer overflow or client needs to trusted tax preparers.
• Offer seasonal promotions: Tax prep demand spikes in January to April. Offer early-bird discounts or package deals for bundled services (tax prep plus bookkeeping, for example).
• Leverage local business directories: List your business on Google Business Profile, Yelp, and the Better Business Bureau. Ensure information is consistent across all listings.

Common Mistakes to Avoid

• Preparing returns without a valid PTIN: This violates federal law and Illinois state oversight. Penalties are severe: fines, criminal prosecution, and permanent bar from the profession.
• Missing PTIN renewal deadlines: Your PTIN lapses if you do not renew by December 31. You cannot sign or file returns with an expired PTIN. Set a calendar reminder in October each year.
• Ignoring client document retention requirements: Keep client files for at least three years. If audited, you must produce them on request.
• Underestimating E&O insurance importance: A single client lawsuit over a missed deduction or error can be costly. Insurance is not legally required, but it is strongly recommended.
• Practicing outside your credential level: If you are not a CPA or Enrolled Agent, you cannot represent clients before the IRS in appeals or audits. Offering such services when you lack credentials is illegal.
• Neglecting tax law updates: Tax law changes annually, sometimes mid-year. Continuing education is not just required for some credentials, it is essential to avoid costly errors.

Expected Timeline and Investment

Most people can begin operating a tax preparation business in Illinois within four to eight weeks of deciding to do so. Your investment depends on your path:

• PTIN application and renewal: set by the IRS each year; check irs.gov.
• EFIN registration: Free (a separate IRS e-file application).
• Business registration (DBA or LLC): $30 to $250 depending on structure and expedite options.
• IDOR registration (MyTax Illinois): Free.
• Tax software subscription: $500 to $3,000 per year.
• Professional liability insurance: $1,000 to $3,000 per year.
• Website and marketing: $200 to $1,000 for initial setup.

Total startup cost is typically $2,000 to $5,000 for the first year, with ongoing annual costs of $2,500 to $4,000 once you are established.

Next Steps: Staying Compliant Year-Round

• Renew your PTIN annually by December 31.
• Stay current with IRS and Illinois Department of Revenue guidance through email subscriptions and industry publications.
• Consider joining the National Association of Tax Professionals (NATP) or another professional organization for networking and continuing education credits.
• Track your business income and expenses carefully for your own tax return. Self-employment income requires quarterly tax payment estimates in some cases.
• Maintain client files and engagement letters meticulously for audit defense and liability protection.

Important Disclaimer

This article is informational only and does not constitute legal or tax advice. Tax law is complex and varies based on individual circumstances. Before starting a tax preparation business or making specific business decisions, consult a qualified attorney or CPA familiar with Illinois law and your specific situation. The Illinois Department of Revenue (tax.illinois.gov) and the Internal Revenue Service (irs.gov) are authoritative sources for current rules, fees, and requirements. Regulations change, and this information reflects 2026 guidelines. Always verify current requirements with the relevant agencies before proceeding.