Zamp has raised $30 million total to build the Operating System of Sales Tax. Our most recent round was led by Acrew Capital with participation from Thomson Reuters Ventures and several of our accounting firm partners.
They join our early backers: Valor Equity Partners, 20Growth, Friends & Family Capital and many other great investors and operators. Each saw what this could become before we’d built it.
Now, we’re using this capital to build on the foundation layer of our Sales Tax OS, and to give the accounting firms that already trust us the leverage they need to scale their practices.
From Managed Service to Operating System
Three years ago, Zamp was a managed service. We did the work for you. It solved a real problem – nobody was owning the outcome for sales tax compliance.
But the model had a ceiling. Customers needed to come to us for nearly every question. Tax rate updates. Filing statuses. Reporting changes.
Even though we managed the entire process, we still had a “black box” problem. Data went in. Filings and compliance came out.
Of course, our team would provide clarity into the “black box”, but the constraint was human support time.
Today, that changes. We’re now giving our customers full visibility, and becoming the Operating System of Sales Tax.
The difference is the deep tax infrastructure we’ve built. We built and own our tax data layer across thousands of jurisdictions worldwide. We own every workflow end-to-end: filings, registrations, notices, data normalization, taxability mappings. And we’ve gone deep: Colorado SUTS, retail delivery fees, multi-entity structures, Chicago PPLT and more.
Every data point and every workflow is programmatically accessible, which means partners can embed Zamp under their own brand, access it through our dashboard, or query it through our API. We also have an MCP in private beta that lets accounting firms securely access compliance data inside their own AI tools.
We deploy AI agents across every step, with tax and legal professionals. These are individuals who understand the legislation, interpret it, and advise our customers. They oversee our agent-led operation.
And if we get it wrong, we cover the penalty. Owning the outcome has only been true of the best service firms, the top tier. Now, we’re doing it at software scale.
This is what separates infrastructure from software. And it’s what the accounting firms we work with have been asking for since day one.
Why this matters now
Two forces are colliding.
First, 75% of U.S. accountants are expected to retire in the next 15 years. When a firm loses a senior tax person, they lose institutional knowledge – which clients have which nexus obligations, what’s the taxability of this product in this jurisdiction, why was this notice resolved this way.
Second, compliance keeps getting more complex. More states. More laws. More product-specific taxability requirements.
The old playbook doesn’t work anymore.
Self-serve software tells the firm “here’s a dashboard, figure it out.” That doesn’t scale when firms are losing people. What works is AI agents handling the 95%+ that’s repeatable, with real tax professionals handling the edge cases, judgment calls and trusted advice.
Give the humans leverage, not more software to manage. We’re seeing it in our own numbers:
One person on our compliance team is now doing what used to take 12 people. We think that gets to 100x this year. Our filing agents handle returns across every state. To put it into perspective, in one state, our agent accurately files over 1,000 returns in two hours.
Our data normalization agents ingest messy transactional spreadsheets, clean and validate them automatically, and get new clients live in days instead of weeks.
Our notice management agents parse compliance notices, determine the required action, and log into state portals to make the changes.
Thanks to our agents, we’ve filed over $400 million in sales tax across 100,000 timely returns at a 99.97% filing accuracy. And we’ve processed over 75,000 compliance notices. Saving our customers and partners hundreds of thousands of real hours.
The reason the agents actually work and aren’t just a buzzword is because we built and own the data and workflow layers. If you’re building agents on top of someone else’s API, you’re limited by what they expose. We’re not. And we see it in the P&L – in our margins, our ability to scale with customers, and the accuracy of every outcome we deliver.
The accounting firm channel
Over 120 accounting firms are on Zamp. Withum. Frank Rimerman. Larson Gross. Anchin. Crew Finance. Ecommerce Accountants. Over 98% partner retention.
The firms that chose Zamp aren’t looking for another tool. They’re looking for a high-trust partner that drives higher NPS, higher margins, better service for their clients – without the need to build out a sales tax practice.
The newer vendors in this space built dashboards. Accountants don’t need dashboards. They need the work done.
We built agents to partner with our tax professionals instead. That’s why we’re raising to scale, not to cover overhead. We can support 50 more accounting firms with the team we have today, and that number compounds as the agents get sharper.
Why? Because the agents carry the weight. At full build, our OS gives accounting firms SaaS-like margins on their sales tax practice while delivering the outcome of a service firm. That’s the power of Service-as-a-Software.
Our direct customers feel it too. Crumbl Cookies chose Zamp over an established vendor. Oats Overnight, David Protein, Cult Gaia, Vapi AI, Handwrytten, NAV, LumiQ and hundreds of other businesses run their sales tax on Zamp.
What’s next
We’re deploying this capital in three places.
First, the accounting firm channel. Our partnerships team tripled in the last six months and we’re scaling from local and regional practices to the top 25 accounting firms in the world. We want to enable their flywheel – better NPS, better margins, better service for their clients.
Second, the product. Adding more services embedded with AI agents. Certificate management is coming next. The goal is helping one tax professional get 100x output. That’s what the investment fuels.
Third, global expansion. We’ve been adding end-to-end filing and compliance across the EU, Australia, New Zealand, the UK, and more. We’ll continue going deeper across 100+ countries.
Thank you
We’re a team of 70 people. We’ll continue to grow intentionally. One of our core beliefs is that smaller, more focused teams deliver better outcomes. If you want to be part of that, we’re hiring.
To our customers, our partners, and our investors, thank you for trusting us to own the outcome. None of that happens without the relationships we’ve built over the last three years.
Thank you again to John Gardner and Acrew Capital, Tamara Steffens and the Thomson Reuters Ventures team, and every partner who invested in us. You’re betting on the future of sales tax.
We’ve built the foundation of the Operating System. Now we get to build everything that runs on top of it – more workflows, more countries, deeper agents, smarter automation. We’re just getting started.
Rohit Bhadange
