Trusted Tax, Legal, Business Owner & Wealth Services

Explore the full suite of tax, legal, and wealth-building services offered through Mark J. Kohler’s trusted companies. Whether you’re starting a business, building a retirement strategy, or leveling up your professional career, these resources are designed to support entrepreneurs and advisors at every stage. From legal structuring with KKOS Lawyers, to self-directed retirement accounts with Directed IRA, registered agent services at Main Street Business, and advanced tax pro and business owner certifications via Main Street Professionals, each brand is built to empower you with expert strategies and tools for success.

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Smart legal strategies for your business, assets, and legacy.

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Self-directed retirement plans for next-level investing.

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Education, tools & community for thriving entrepreneurs.

The Main Street Business Owner’s "Situation Room"

Whether you’re launching, growing, or preparing to exit, the Business Owner Situation Room equips you with 40 must-ask questions—10 for each stage of the business lifecycle. These are the legal, tax, and strategic questions most business owners don’t even know they should be asking—until it’s too late.

Stay ahead. Make smarter decisions. Build with confidence.

Get Your Team Tax Certified—The Main Street Way

Built for Practice Owners & Partners
You’re no longer the learner. You’re the leader.

The Enterprise Edition of our flagship Main Street Tax Pro Certification is designed for Practice owners and partners who want to build a scalable, consistent, and profitable tax advisory practice…by investing in their people.

starting at $5,000

Become a Main Street Certified Tax Advisor

Discover Year-Round Success Beyond Tax Season
Elevate your expertise, expand your client base, and unlock your full Tax Pro potential with our Main Street Tax Pro Certification.


There are many benefits to taking our certification course: Flexibility, autonomy, and the peace of mind that comes with building a recession-proof career.