How to Start a Pest Control Business in Indiana: OISC Licensing

If you want a pest control license in Indiana, the agency you need is the Office of the Indiana State Chemist (OISC), the pesticide regulator housed at Purdue University. Indiana has no single comprehensive business license, so the OISC licenses are the part of setup that is specific to your trade. This guide covers the order most owners take the work in: form the business, certify as an applicator, license the business, license each applicator, and keep everything current on the same December 31 cycle.

This article is informational content, not legal or tax advice. Fees and rules change, so confirm every figure with the agency named before you pay or file. For entity choice, liability, and tax questions, talk to an Indiana attorney and a CPA.

What You Need Before You Start

Gather these items before you file anything. Most of the delays new owners run into come from one missing piece.

• A business name that passes the Secretary of State's distinguishability check (see Step 1).
• An Indiana registered agent and a registered office street address, if you form an LLC or corporation.
• A commercial applicator who has passed the OISC Core exam and a category exam. This can be you or an employee.
• A certificate of insurance for the business. Your insurer issues it, and OISC requires it for the business license.
• The current OISC application form (Rev. 03/24) and a list of every applicator and technician you plan to license.
• A calendar with December 31 marked, because applicator and business licenses all expire that day.
• A budget for state fees. The verified figures are in the table near the end of this article.

Step 1: Choose and Register Your Business Structure

You can operate as a sole proprietor without filing with the state, but many pest control companies form an LLC to separate personal and business liability. Forming an LLC in Indiana involves these items:

• Articles of Organization, Domestic Limited Liability Company (State Form 49459): $95 filing fee, completed and paid in one online session through INBiz at inbiz.in.gov.
• Name reservation: $10, which holds a name for 120 days if you need time before filing.
• Name rules: The name must include Limited Liability Company or an abbreviation of it, such as LLC. It must also be distinguishable from names already on the Secretary of State's records. Adding or dropping Inc., LLC, punctuation, or capitalization does not make a name distinguishable. If “Hoosier Pest Control Inc.” is already on file, “Hoosier Pest Control LLC” will likely be rejected, so search the Business Services Division database before you pick a name.
• Registered agent: Every LLC must continuously maintain an Indiana registered agent and registered office. The agent can be an Indiana resident whose business office is the registered office, or an entity authorized to do business in Indiana. The office must be a street address, since a P.O. Box is not sufficient unless it comes with a rural route reference. Your business cannot serve as its own agent.
• Processing time: The Secretary of State does not publish a processing standard for formations, and no expedited option exists for a domestic LLC. Do not promise clients a start date until you see the filing approved.

If you will operate under a trade name that differs from the registered name, file a Certificate of Assumed Business Name (State Form 30353). Through INBiz, the fee is $20 per name. Sole proprietors and general partnerships record the assumed name with the county recorder instead, and each county sets that fee. The form is available at forms.in.gov.

Indiana has no franchise tax. An LLC's income passes through to its owners, who pay the individual adjusted gross income tax (2.95% for 2026, scheduled to fall to 2.90% in 2027) plus county local income tax. An LLC that elects corporate treatment pays the 4.9% corporate rate. Ask a CPA which treatment fits your situation.

Step 2: Earn Your Commercial Applicator Certification

Commercial pest control in Indiana requires certification, not just a business license. A commercial applicator must pass the written OISC Core exam and a category exam that matches the work, such as structural pest control or turf. Certification is valid for five years and expires on December 31 of the fourth year after the year you qualified. You renew it either by retaking the exam or by completing continuing certification hours.

The exam fee is not confirmed. The fee was not listed on OISC pages we could confirm, and third-party figures for it are contradicted by OISC, so do not budget from them. Call OISC at 765-494-1492 for the current exam fee, test schedule, and study materials. Ask them to confirm the exact expiration date for your certification, since the cutoff depends on your qualification year.

Step 3: Apply for the Pesticide Business License

The business needs its own pesticide license from OISC, which OISC lists on its application form at $45.00 per year. Three requirements apply:

• A certificate of insurance must accompany the application.
• The license is issued per business location, so each location where you operate needs its own license.
• The business must employ at least one certified applicator.

Business licenses expire December 31 each year, so put the renewal on your calendar before you file the first one.

Step 4: License Each Applicator and Technician

Every person who applies pesticides for hire needs an individual license. OISC's application form lists these fees:

• For-hire pesticide applicator license: $45.00 each. A Category 13 limited certification also carries the $45.00 fee.
• Registered technician (RT): $45.00 each.
• Public applicators: No fee. This applies to applicators working for public agencies, not to private pest control companies.

All of these licenses expire December 31. If you add a technician mid-year, license that person before they apply anything for your company.

Step 5: Add a Wood-Destroying Pest Inspection License If You Need One

If you perform wood-destroying pest inspections, you need a Category 12 wood destroying pest inspection business license. OISC lists the fee at $45.00 on the same application form. Confirm with OISC whether your inspection work falls under this category before you sell inspections, because mixing inspections with treatment work can change which licenses apply.

Step 6: Handle Lawn Fertilizer Applications Separately

Pest control licenses do not cover lawn fertilizer. Under OISC's Lawn Care Service Memo, a person who distributes tank-mixed liquid fertilizer for lawn care must hold a license in Category 3b Turf Management. The application goes on Form LC-1, the fee is $100 per location, and the license expires December 31.

An earlier figure of $45 for a separate lawn fertilizer applicator license is not confirmed. OISC has not confirmed it as a separate fee, so ask OISC before you assume it applies.

Step 7: Check Local Rules and Sales Tax Registration

Indiana does not issue one business license for every trade. Local permits and zoning approval come from your city or county, so check with the planning or permit office where each service location sits. If you sell taxable goods, such as products you resell to customers, you may need a Registered Retail Merchant Certificate from the Indiana Department of Revenue. The fee is $25 per place of business, and you register through INBiz. The Department's page is at in.gov/dor. Whether your services are taxable is a question for a CPA.

Fee Summary

Use this table as a planning checklist. Anything marked not confirmed must be confirmed with the named agency before you budget it.

Item	Fee	Status and where to confirm
LLC Articles of Organization (State Form 49459)	$95	Verified, Secretary of State via INBiz
Name reservation	$10 for 120 days	Verified, INBiz
Certificate of Assumed Business Name, online	$20 per name	Verified, Secretary of State
Business Entity Report (LLC)	$32 every other year	Verified, Secretary of State
Pesticide Business License (per location)	$45 per year	Verified on OISC application form (Rev. 03/24)
For-hire pesticide applicator license or Category 13 limited certification	$45 each	Verified on OISC application form (Rev. 03/24)
Registered technician (RT)	$45 each	Verified on OISC application form (Rev. 03/24)
Category 12 wood destroying pest inspection business license	$45	Verified on OISC application form (Rev. 03/24)
Public applicator	No fee	Verified on OISC application form (Rev. 03/24)
Category 3b Turf Management, Form LC-1 (per location)	$100	Verified, OISC Lawn Care Service Memo
Commercial applicator exam fee	Not confirmed	Confirm with OISC at 765-494-1492
Separate lawn fertilizer applicator fee	Not confirmed	Confirm with OISC at 765-494-1492

What Licensing Does and Does Not Do for Your Business

A complete license file shows clients, property managers, and insurers that your certified applicators and business license are in order. That documentation is generally what they ask for first. It does not guarantee any level of pest control, and it does not replace the label directions for each product you use. Pest outcomes depend on the pest, the property, and the conditions, so describe your services in terms of what you plan to do, such as inspecting, monitoring, and applying products according to label instructions, rather than promising that a pest will be eliminated.

Integrated pest management practices, which combine inspection, monitoring, sanitation advice, and targeted treatment, are generally described as reducing reliance on repeated chemical applications. Whether that happens on a given job depends on the situation, so treat it as a method you follow, not a result you can promise.

Common Mistakes to Avoid

• Budgeting from third-party fee sites. Some sites list a $50 business fee or a $25 exam fee. OISC contradicts both figures, so use the verified table and confirm the rest with OISC.
• Missing the December 31 cycle. Applicator licenses, technician licenses, and business licenses all expire on the same day. One missed renewal can stop work for every technician under that license.
• Licensing one location and operating from another. Pesticide business licenses are issued per location, so a second office or a branch needs its own.
• Hiring a technician before licensing them. Put each person on the OISC license file before they apply anything for your company.
• Using a P.O. Box as the registered office. Use a street address, and do not name your own business as the registered agent.
• Picking a name without searching first. A name that differs only by an entity ending or punctuation will not be accepted as distinguishable.
• Assuming pest licenses cover lawn fertilizer. Lawn fertilizer work needs its own Category 3b license and Form LC-1.
• Skipping the insurance step. The certificate of insurance is required for the business license, so start that conversation with your insurer early.

Tips for a Clean Filing

• Print one master calendar that lists every license, its fee, and its December 31 deadline, and assign one person to own it.
• Call OISC before you file. A five-minute call at 765-494-1492 can save you a rejected application and a second fee.
• Keep copies of your certificates, insurance certificate, and application receipts in one folder that you can hand to a client or inspector on request.
• Run your business name through the Secretary of State search, then reserve it if you need time to finish your paperwork.
• If your structure, tax treatment, or insurance needs are complex, pay for an hour with an Indiana attorney or CPA before you file rather than fixing problems later.

Official Resources and Who to Call

• Office of the Indiana State Chemist (OISC), Purdue University: 765-494-1492 for exam fees, applicator certification, business licenses, and the Category 3b lawn fertilizer process. Search for the OISC page through Purdue University to find the current application forms.
• Indiana Secretary of State, Business Services Division: in.gov/sos/business for entity filings, and inbiz.in.gov for online filing.
• Indiana Department of Revenue: in.gov/dor for tax registration and the Registered Retail Merchant Certificate.
• Indiana Small Business Development Center: isbdc.org for business advising.
• U.S. Small Business Administration, Indiana district: sba.gov/district/indiana for loan and counseling programs.

Next Steps

Start with the business name search and the Articles of Organization if you are forming an LLC. Then call OISC to confirm the exam fee, schedule the Core and category exams, and ask for the current application forms. Once your certified applicator is in place and your insurance certificate is in hand, file the business license and each applicator license under the same December 31 calendar.

This article is informational content, not legal or tax advice. Confirm every fee, form, and deadline with the agency named above, and consult a qualified Indiana attorney and CPA before making decisions about your entity, taxes, or liability.