United States
Federal corporate tax, state-by-state economic nexus, and GAAP reporting — handled by a team that tracks obligations across all 50 states, not just the ones that seem obvious.
Fifty States. Fifty Different Sales Tax Clocks.
A business that sells into ten US states isn't dealing with one tax authority — it's dealing with ten, each with its own registration threshold, filing calendar, and penalty structure. Since South Dakota v. Wayfair in 2018, 45 states now require registration once a seller crosses an economic nexus threshold, and nothing notifies you automatically when you've crossed it. Missing a threshold in a state you didn't even know you had exposure in is one of the most common, most expensive mistakes international businesses make in the US.
The full scope of US-market work, handled end to end.
Here's exactly what that looks like handled properly:
Built for businesses entering or already operating in the US market.
Accounting & CPA firms
White-label US compliance support for your international clients, delivered under your own brand.
Businesses in United States
Direct accounting, tax, and compliance support for businesses selling into or operating within the United States.
If you're a single-state, single-entity US business with an existing local CPA who's already tracking your nexus exposure accurately, you likely don't need a new partner for this market specifically.
What We're Tracking In The US Right Now.
The US doesn't run on one national rulebook — it runs on fifty overlapping ones. Here's a sample of what we track, right now, for businesses operating here.
Economic Nexus
Since South Dakota v. Wayfair (2018), 45 states require registration once a seller crosses a threshold, most commonly $100,000 in sales or 200 transactions — tracked separately in every single state.
Federal Corporate Tax
The US federal corporate income tax rate has sat at a flat 21% since the 2017 Tax Cuts and Jobs Act, applied on top of whatever state-level corporate tax also applies.
Audit Requirements
The US has no blanket federal audit requirement for private companies — audits are triggered by SEC registration, federal award thresholds, or specific industry rules, not company size alone.
US GAAP Reporting
US GAAP is a rules-based standard with detailed, prescriptive treatment for specific transaction types — a different philosophy from the principles-based IFRS used in most other markets we serve.
A documented process, from scoping to your first US filing.
Click a step to see how it works.
Free consultation
We learn where you're selling, which states you may already have exposure in, and your current filing status.
Scope & proposal
A clear list of deliverables, nexus states, and filing deadlines.
Secure onboarding
NDA signed, access set up, existing filings reviewed for gaps.
Filing & advisory
Federal and state obligations filed on schedule, with proactive nexus monitoring as you grow.
The advantage isn't knowing federal tax law. It's tracking fifty states' worth of thresholds so you don't have to.
Federal compliance is the easy part. What's harder is knowing exactly when a new state's economic nexus threshold has been crossed, before a penalty notice tells you. That's the real value of a team that watches this continuously, rather than reviewing it once a year at filing season.
Pricing depends on scope, not guesswork.
States
How many states you have nexus exposure in.
Entities
How many legal entities need US filings.
Frequency
Monthly, quarterly, or annual filing cadence.
There's no flat rate that fits a single-state business and a fifty-state seller the same way, so we don't pretend there is. Most engagements are scoped and quoted on the first call, not after weeks of back-and-forth.
Why not just hire a local US accountant?
A fair question — here's how the trade-off actually looks.
Hiring Locally
Partnering with Corptiva
Case studies from this market.
Catching economic nexus exposure in six unregistered states before penalties hit
What proactive multi-state nexus monitoring looks like when a growing e-commerce business had no idea how many states it owed sales tax in.
Fluent in the tools you already use.
What clients usually ask.
Yes — nexus monitoring across every state you sell into is a core part of this practice.
Yes, both are coordinated as part of the same engagement.
Yes, a nexus exposure review is typically the first step of onboarding.
Yes, including entity formation guidance in coordination with our Corporate Legal practice.
Pricing scales with the number of states involved, since each state is effectively a separate filing obligation.
Yes, in coordination with our International Services practice.
One call to see if we're the right fit — no pitch, no pressure.
Tell us what you're dealing with — messy books, a firm outgrowing its bandwidth, a market you haven't worked in before. We'll tell you honestly whether Corptiva is the right partner for it.