We are a team of former Big 4 partners with over 100 collective years of state and local tax consulting experience.
We represent leading Fortune 500 businesses in many different industries.
State Tax Consulting from Seasoned Professionals.

Companies with multistate operations face complex state and local tax rules and regulations. Multistate Tax Solutions (formerly known as Barnwell & Company) can support companies facing mulit-state issues, including income and franchise taxes, allocation and apportionment, sales/use taxation, business license taxes, tax base issues including unitary, combined, consolidated and separate filing status, gross receipts taxes, UDITPA issues, state tax audit and controversy assistance, statutory and negotiated incentives, grants, training programs and awards, job and wage credits, investment and other state and local tax credits, and state tax planning in connection with mergers and acquisitions including state tax issues associated with 338(h)(10). Multistate Tax Solutions also provides state tax consulting for FIN 48, and state tax planning, including structure reviews, consideration of entity for state tax purposes including use of Subchapter C, Subchapter S, LLCs, both regarded and disregarded, partnerships and other special purposes entities. We also provide state and local assistance and due diligence for mergers and acquisitions, and conduct sales/use and income/franchise reverse audits. Our work often leads to refunds of state and local tax overpayments.

Learn More About Multistate Tax Solutions>


We offer a broad range of services to assist our clients in taking advantage of every tax savings opportunity, including:

  • - State income & franchise refund tax analysis
  • - State income & franchise tax planning
  • - Sales & use tax refund analysis
  • - Sales & use tax planning
  • - State and local credits and incentives
  • - State income/franchise & sales/use audit defense
  • - Special state tax projects
  • - Federal and state fuel tax recoveries
  • - FIN 48 reserve mitigation

Multistate Tax Solutions >


In every client engagement, we guarantee our service. This means that if the client is unsatisfied with our work, we will adjust or eliminate the fee. Our firm policy is to never leave a client unsatisfied. Period.
Close Move

P R I V A C Y    P O L I C Y

mtstaxllc.com is owned and operated by Multistate Tax Solutions. Multistate Tax Solutions collects personal and non-personal information on mtstaxllc.com. Multistate Tax Solutions is committed to protecting the privacy of its users. We have created this Privacy Policy in order to describe and explain to users our information collection practice.


Personal information is collected and used primarily to contact a user to discuss his tax consulting needs. We do not sell, rent, share, or otherwise dispose of the personal information collected on mtstaxllc.com to third parties. We may, however, disclose your personal information when required by law or in the good-faith belief that such disclosure is necessary to comply with law.