Davis Davis & Harmon (DDH) is an award-winning multi-state sales tax firm. We know nationwide sales tax laws, how to interpret them, and how to advocate for our clients. We go above and beyond to navigate challenging sales tax issues to deliver the best results.
Audit Defense
Respond to an Audit by Your State Tax Board
We vigorously defend your company’s interests from the beginning of the audit through the appeals process, and seek to minimize sales tax assessed by your state. We consult with you on sales tax laws, policies, and statutory exemptions.
Compliance Programs
Ensure You Comply with All State Tax Laws
We’ll actively consult on your sales tax situation to stay ahead of issues before they become liabilities. Our sales tax expertise will help you confidently operate your business across multiple states and meet all of your tax obligations.
Nexus Analysis
Learn Your Tax Exposure Across Multiple States
We analyze your company’s sales/use tax risk and exposure associated with future expansions, mergers, acquisitions, and multi-state operations. We’ll help your business stay on top of complex tax situations as you grow.
Refund Recovery
Reclaim Overpaid State Taxes
Our refund recovery service analyzes your company’s sales/use tax reporting process to identify and recover overpayments. Our sales tax experts have recovered millions on behalf of our clients.
Research & Opinions
Get an Expert Opinion
We research complex taxability questions and provide written, expert opinions. Learn when you should collect sales tax based on your products/services and location with insights from DDH, your partner sales tax firm.
Voluntary Disclosure
We Advocate & Negotiate for You
If you have unreported sales tax exposure, our sales tax consulting team will help you make a voluntary disclosure. We’ll handle the full process of documentation, communications, and settlement negotiations.
$2B+
Returned to client bottom lines
30+
Years of specialized sales tax expertise
One of the Largest
Sales Tax Advisory Practices in the Nation
All 50 States
Multi-state coverage and compliance
What our clients have to say
My personal experience with Davis, Davis & Harmon has been beyond satisfactory…It has been exceptional. In every single instance, their service was exemplary, their staff professional, and their attention to detail amazing. It is without reservation that I endorse the services of Davis, Davis & Harmon. I really enjoy working with them, and I feel confident our partnership will continue well into the future.
G.C. Telecom
Industry
We highly recommend Davis, Davis & Harmon to any business that has direct dealings with sales tax. They have assisted our company by performing nexus studies and registrations for multiple states in which we are now successfully reporting to. They always give us their undivided attention and respond to requests in an unprecedentedly timely manner. We are confident we have the most up to date sales tax information along with the top representation in the industry.
D.N. Multi-State Retail & Wholesale
We hired Davis & Davis after a year and a half of mediation with the state. They were able to prove that we were not liable for the million dollar amount and managed to settle our audit for less than one-percent of the original assessment.
M.K. Electrical Engineering & Construction
Nexus challenges abound in all states. We handle the hard state challenges so you can run your business.
With Wayfair vs. South Dakota changing the landscape, even companies without physical presence now face sales tax obligations across multiple jurisdictions.
Get in touch with our expert sales tax team today and start your journey towards business success with DDH Tax.
Why Choose DDH Tax?
As a sales tax consulting firm, we offer comprehensive services ranging from sales and use tax training to our specialty of defending and protecting the interests of businesses during sales tax audits.
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See the important news, insights, and featured blog content from the tax experts of DDH Tax, including state-specific tax laws and best practices, events, and more.
We're Proud of Our Team
✅ Named Supplier of the Year In 2016 & 2019
✅ Award-Winning Women-Led Sales Tax Firm
✅ Certified SBA WOSB Woman Owned Small Business
“Their sales tax consulting team worked with me on a sales tax audit from hell. Their negotiation and business knowledge of the Texas Comptroller’s office was the kingpin in our success.”
Lisa B.
We have a 50-state reach with a unique focus on transaction tax.
With Wayfair vs. South Dakota changing the landscape, even companies without physical presence now face sales tax obligations across multiple jurisdictions.
Get in touch with our expert sales tax team today and start your journey towards business success with DDH Tax.
Get in touch with DDH Tax today
Expert Sales Tax Consultants
What does a sales tax consultant do for a multi-state business?
A sales tax consultant analyzes your company’s tax obligations across jurisdictions, defends you during audits, identifies overpayments for recovery, and advises on nexus exposure tied to expansions, mergers, or acquisitions. Davis Davis & Harmon LLC. combines this with hands-on negotiation experience, representing businesses directly with state tax boards rather than just offering advice.
How does the audit defense process work?
Audit defense involves representing your company from the initial notice through appeals, reviewing assessments, applying statutory exemptions, and negotiating directly with the state tax board to minimize the amount owed. The goal is to protect your business interests at every stage, not just respond to paperwork.
What is nexus, and why does it matter for my business?
Nexus refers to the level of business activity in a state that creates a sales tax obligation there, even without a physical location. Since the Wayfair vs. South Dakota ruling, economic activity alone can trigger nexus in multiple states, making it essential for growing businesses to understand where they owe tax.
What happens during a voluntary disclosure process?
A voluntary disclosure allows a business with unreported sales tax exposure to proactively report it to the state, often resulting in more favorable terms than waiting for an audit. The process includes preparing documentation, managing state communications, and negotiating settlement terms on the business’s behalf.
Can a sales tax refund recovery review actually find overpayments?
Yes, a refund recovery review examines your sales and use tax reporting history to identify errors that led to overpayments. This process has helped businesses recover significant amounts by catching miscalculations, missed exemptions, or incorrect filings in past reporting periods.