Zamp + Checkout Champ: Accurate Sales Tax, Built Into Your Checkout

Today we're launching our integration with Checkout Champ, the performance e-commerce platform built for high-volume DTC brands.

Checkout Champ is built for one thing: turning paid traffic into sales at volume. Custom funnel pages, one-click upsells, fast checkouts. When orders are moving that quickly and shipping to every corner of the country, sales tax has to keep up. Every order needs the right amount applied at the moment of purchase, with no manual cleanup later.

That's what this integration does, natively inside Checkout Champ. Here's what it gives you.

Rooftop-level calculations on every transaction

Sales tax rates can change from one address to the next, not just by ZIP code. A single five-digit ZIP can span multiple tax jurisdictions, and getting it wrong by even a fraction of a percent adds up fast across thousands of orders.

Zamp calculates tax at the rooftop level, down to the exact delivery address, so each order collects the correct amount. The calculation runs right inside Checkout Champ at checkout. It also covers manual order entry and full or partial refunds, so the numbers stay accurate across the full order lifecycle, not just the first sale.

Product tax codes are part of this too. Different products are taxed differently from state to state, and Zamp applies the right treatment to each item rather than charging a flat rate across your catalog.

Address validation on every order

The integration validates customer addresses as part of the calculation. You get cleaner shipping data and tax tied to a real, verified location.

For high-volume stores, this is where a lot of quiet problems start. A mistyped street or a wrong ZIP leads to a failed delivery, a support ticket, and a tax figure tied to an address that doesn't exist. Validating the address up front means the calculation is right and the package actually arrives. One step, two problems solved.

Easy to install, with live support

Add the Zamp plugin to your Checkout Champ instance and start calculating tax right away. There's no rebuild and no developer project required.

Product tax codes, automatic updates, and live installation support are all included. If you'd rather have a hand getting set up, our team will walk through it with you, so you're calculating correctly from the first order.

Calculations are the part you see. We handle the rest.

Getting tax right at checkout is the visible piece. The work behind it is where most merchants lose time. Zamp manages the full compliance lifecycle, not just the math in your cart.

We track your nexus as you sell into new states and flag when you've crossed a threshold. We handle your registrations. We file your returns on time. And when a state sends a notice, we deal with it. Zamp owns the outcome and shoulders the liability, so sales tax stays off your plate as you grow.

It's all one simple price. No per-filing fees, no per-transaction charges, no surprise line items that climb as your volume does. You know what you're paying, and it stays predictable as you scale.

Built for how you actually sell

This integration was built for the brands already running on Checkout Champ: high-volume, multi-state, moving fast. You shouldn't have to choose between a checkout that converts and sales tax that's fully handled. Now you get both in the same place, at one price you can plan around.

Get started

Find time with our team or email sales@zamp.com.

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