Enterprise systems. Human care. No bullshit.
What if your financials weren't a source of stress but a competitive advantage?
You're probably here because you're…
…ready to scale past DIY.
You need your financials dialed in so you can focus on growth, not QuickBooks.
…outgrowing your accountant.
You need a CFO's eye on your numbers and answers that help you move faster.
…raising capital.
Especially in med device, cannabis, or psychedelics: you need investor-grade accounting, not cleanup work.
Or maybe you're ready to retire.
I'd love to talk about transitioning your book of business to someone who will protect the legacy and client relationships you've built over decades, with flexible terms including seller financing.
Let's talk succession →Working in a highly regulated industry? We're built for you.
Med device
Investor-grade books and reporting built around your funding and FDA milestones.
Cannabis
280E-ready inventory costing, so you deduct every dollar the law allows.
Psychedelics
Compliance-ready books for a brand-new industry, from clinical-stage biotech to licensed healing centers.
QuickBooks expertise + fractional CFO insight
You're our peer, and we talk to you like one. Expect "Yep, got it" or "That's great, nice work," not a page of accountant nonsense.
Backed by enterprise-grade systems, AI-powered automation, clean books, meaningful reporting, and year-round clarity.
We automate the busywork so we can spend our time with you.
Here's what others have to say about us...
"Our medical device business has worked with Tenax Accounting for a couple of years now. We've had a great experience and their level of knowledge, professionalism and timely communication has exceeded our expectations. I would highly recommend Tenax's services."
"I was introduced to Tenax by a trusted friend and I was immediately impressed. Professional, efficient, helpful. Highly recommend!"
"Tenax handles bookkeeping and management/financial reporting for a non-profit with which I am associated. Katie and team are great, always responsive, timely and accurate with their work. They are knowledgeable and experienced with non-profit accounting, based on my experience. I highly recommend them!"
How it works
Ask Katie
15 free minutes. Real answers. No pitch.
Your plan
Katie scopes what you need and what it costs.
Kickoff
Katie introduces your dedicated accountant, then checks in with you every quarter.
Questions
How much does it cost?+
Bookkeeping starts at $499/month. Pricing is based on how many accounts we reconcile each month. See pricing →
Do you require a long-term contract?+
No. We work month to month. If you ever want to move on, we'll package up your records and work with your next provider so the handoff is as painless as possible.
Do you work with clients outside Arizona?+
Yes. We're based in Tempe and work with clients nationwide.
Can you clean up messy QuickBooks books?+
Yes. Historical cleanup is a separate project, sized the same way as our bookkeeping tiers. If prior-year business returns need to be filed or amended, we can handle those too.
What does a fractional CFO do?+
CFO-level guidance, part-time: forecasting, cash planning, investor-ready reporting, and a second brain on big decisions, without a full-time CFO salary.
What's the difference between a bookkeeper, a controller, and a fractional CFO?+
A bookkeeper records transactions and reconciles accounts. A controller makes sure the books are accurate and the financials are reliable. A fractional CFO uses those numbers to plan ahead. Every month, a senior reviewer checks your books and financials, the same job a controller does at a bigger company. Fractional CFO is an add-on.
Do you use AI? What happens to my data?+
Yes. We use the AI built into the accounting apps that already hold your data, like QuickBooks. Outside those apps, we use Claude and Gemini on business accounts whose terms don't allow your data to be used for AI training. A senior reviewer checks the work before it reaches you.
Do you work with nonprofits?+
Yes, and we know nonprofit accounting inside and out.
Are you neurodivergent- and queer-friendly?+
Yes. Prefer email over calls? Need it in writing? Want one thing at a time? Tell us, and we'll work the way your brain works. No one has to explain themselves.
Are you buying accounting practices?+
Yes. If you're a CPA, EA, or bookkeeper thinking about retirement, we'd love to talk. Flexible terms, including seller financing. Let's talk succession →