When Eli Ackerman came back from the holiday break, he had one thing on his desk he hadn't had before: a sales tax problem.
RentCheck's outsourced CFO service had delivered the message bluntly. The company had obligations across more than six states, nothing was set up, and every week of delay was adding to the liability. Eli, RentCheck's Head of Operations and Partnerships, had never handled sales tax. He was about to learn it at sprint pace.
"The CFO service made me feel very panicked about the extent of our obligations and the potential penalties. It wasn't going to be leisurely. It was going to be a sprint."
About RentCheck
RentCheck is the property inspection platform that lets residents run their own move-in, move-out, and routine inspections from a phone. Property managers get standardized, time-stamped reports without the drive time or the scheduling back-and-forth, so they can add doors without adding headcount.
Like most seed-stage companies, RentCheck runs lean. Sales tax sat outside the team's expertise and stayed there — right up until it couldn't.
The challenge: exposure built slowly, then all at once
The core problem: RentCheck had never charged sales tax. As a B2B software company billing through Chargebee, it had been accumulating economic nexus as revenue grew and physical nexus as its distributed team spread across states. By late 2025, those two forces had created filing obligations in more than six states, and nobody had been watching.
The warning landed mid-budget season. Eli had two jobs at once: figure out what RentCheck owed and where, and connect a compliance tool to Chargebee before April 1. All without pulling his small product team off the roadmap to build it.
"When we got back from the holiday break, I threw myself into solving this as fast as possible."
The search: when every tool looks the same on paper
Anrok was Eli's first call, on the strength of its Chargebee integration. He also looked at Numeral and Kintsugi. On paper, they blurred together. Each promised a Chargebee integration, state registrations, and a guided onboarding.
The legacy platforms didn't make the cut. Avalara read as clunky and dated. TaxJar couldn't track physical nexus from a distributed workforce, which was exactly what RentCheck needed. Anrok stood out for SaaS-built automation that included physical nexus tracking from Rippling, plus native integrations that kept the work off engineering's plate.
But with the newer tools looking comparable on capability, Eli made a call. He signed with Numeral.
A false start with Numeral
The plan was to connect Chargebee, get a state-by-state read on exposure within a day or two, and start collecting.
None of it happened.
The integration synced, then nothing. No exposure data appeared in the dashboard, and the sales rep Eli had been working with stopped responding entirely.
"The integration synced, but there was nothing in my dashboard. And the team I'd been working with at Numeral stopped responding. They disappeared off the face of the earth."
The vendor that had promised a smooth onboarding never let him use the product at all. Weeks passed. The April 1 deadline didn't move.
"The biggest problem with Numeral was the service."
The switch: going with the name everyone kept pointing to
Eli didn't wait it out or start over with a third vendor. He went back to Anrok.
The feature list wasn't what decided it. Every direction he'd looked — his own research, his accountant, his CFO service — pointed back to Anrok. The consistent signal was support: people who got on the phone and solved problems.
The difference was immediate. Within 24 hours of switching, Eli had the Chargebee integration working and a clear read on RentCheck's exposure across every state.
"It took my blood pressure down about the budget impact of penalties."
With real numbers in front of him for the first time, RentCheck could identify which states required immediate action and which carried lower risk to build a compliance strategy around it.
The solution: software that works, and people who get you over the line
Onboarding with Anrok was like night and day. Instructions were clear, the integration connected without friction, and registrations moved quickly. When something snagged, a person picked up.
When a state's two-factor login held things up, Eli's ops teammate cleared it live on the phone with Anrok instead of losing days to back-and-forth email. When a Chargebee constraint prevented RentCheck from testing invoices before go-live, the team improvised on a call.
Anrok's native Chargebee integration applies the right sales tax to every invoice automatically — no manual work or custom API build. The Rippling integration keeps physical nexus current as the team moves. Underneath, Anrok monitors economic and physical nexus across states, handles registrations, and files and remits. RentCheck no longer needs to staff any of it.
"What clearly differentiated Anrok was having humans to get me over the line. Validating my exposure, walking me through the trade-offs and the risk strategy. I really appreciated getting to talk to someone and get real guidance."
The results: live in multiple states, run by ops alone
RentCheck went from never charging sales tax to collecting across multiple states by April 1. The Chargebee integration ended the manual invoice work. Anrok took over the nexus tracking that would otherwise have eaten ongoing CPA hours, and now flags new states before RentCheck has a costly compliance gap.
"Getting it live was so reassuring that I told my team operations has this solo. We don't need anyone from product involved, the numbers were accurate and clear, so we don't need a third party accountant. The cortisol levels went down across the board."
That's what the combination of automation and reachable people produces. Much of sales tax is deterministic so software carries the repeatable work. But the edges still need people to navigate confusing state rules, two-factor logins, and government agencies that don't run on modern infrastructure. When both halves are covered, a three-week scramble becomes something you stop thinking about.
FAQ
What's the best sales tax software for a SaaS company?
Look for SaaS-specific taxability logic, tracking for both economic and physical nexus, and native integrations with your billing and HR systems. RentCheck chose Anrok for its Chargebee and Rippling integrations and SaaS-built automation, after weighing Numeral, Kintsugi, Avalara, and TaxJar.
Is sales tax automation worth it for a small finance team?
For RentCheck, yes. A seed-stage team with no tax specialist got compliant across multiple states and now runs the whole workflow through operations, replacing ongoing CPA hours and manual invoice work.
Does Anrok integrate with Chargebee?
Yes. Anrok's native Chargebee integration calculates and applies sales tax on every invoice automatically, with no custom API build. RentCheck connected Chargebee and went live across multiple states without pulling in its engineering team.
Get compliant before it becomes a problem
Billing through Chargebee and unsure where your sales tax exposure stands? Talk to an Anrok expert.
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