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Introduction to tax connector

Introduction to tax connector

Business overview

Selling in the US means dealing with a highly fragmented sales tax landscape: thousands of jurisdictions, frequent rule changes, and specific obligations depending on where you sell from and where you ship to. This complexity grows dramatically when you move from a simple e‑commerce model to a true omnichannel strategy with ship‑from‑store and Order in Store.

The OneStock Tax Connector to Avalara is designed to remove that complexity from your teams and your IT. By combining OneStock OMS (which knows exactly where each item is shipped from) with Avalara AvaTax (which maintains up‑to‑date US tax rules and rates), we allow you to automate US sales tax calculation and recording across all your channels.

Why US sales tax is a challenge in omnichannel

In a classic e‑commerce model, taxes are usually calculated once in the webshop, based on the customer’s address and a single warehouse. As soon as you:

  • Ship from multiple stores and warehouses

  • Offer Order in Store and home delivery from store stock

  • Need to manage returns, refunds, and cancellations consistently across channels

…your e‑commerce platform can no longer calculate taxes correctly on its own. The true “source of stock” is only known by the OMS at orchestration time – not by the webshop. This is exactly the gap our Avalara connector fills.

How OneStock + Avalara work together

With the Avalara connector, OneStock becomes your single orchestration and tax truth:

  • During Order in Store or omnichannel orders, OneStock uses Avalara to calculate the correct sales tax based on:

    • The origin of the stock (store or warehouse, where you may have nexus)

    • The destination of the order (customer address)

  • When orders are dispatched, OneStock automatically commits the taxes to Avalara, so they are ready for reporting and filing.

  • If an order is cancelled or modified before shipment, OneStock can void or refresh the tax document in Avalara.

  • When items are returned and refunded, OneStock can refund the corresponding taxes via Avalara.

All of this happens behind the scenes, driven by your OneStock workflows, so your operations team doesn’t have to manage tax logic manually.

Key benefits for your US go‑to‑market

By using the OneStock Tax Connector – Avalara, you gain:

  • Effortless US tax compliance in an omnichannel context
    OneStock and Avalara together handle origin/destination logic, nexus, and local rules, even when orders are split, rerouted, or partially fulfilled.

  • Faster time‑to‑market for ship‑from‑store and Order in Store
    You don’t need to redesign your e‑commerce tax integration for omnichannel. You plug Avalara into OneStock, and we take care of tax calculation and recording at the right moment in the order lifecycle.

  • Consistent tax handling across channels
    Whether the order is placed online, in store, or a combination, taxes are calculated, committed, refunded, or voided in a standardized way.

  • Reduced operational and compliance risk
    Avalara keeps US tax rates and rules up to date; OneStock ensures the right tax is applied to the right order from the right location, and that each change (dispatch, cancellation, return) is correctly reflected in Avalara.

  • Lower IT complexity
    Instead of building multiple custom integrations and rules per channel, you rely on OneStock as the single integration point to Avalara for all your omnichannel flows.

Typical use cases covered

Our Avalara connector is already used by brands to support scenarios such as:

  • Order in Store, fulfilled from store stock
    A store associate sells an item that is taken directly from store inventory: OneStock triggers Avalara tax calculation and tax commitment when the sale is completed.

  • Ship‑from‑store for online orders
    An e‑commerce order is routed to one or several stores for fulfillment: taxes are calculated and committed using the actual shipping stores as origins.

  • Home delivery vs. in‑store collection
    Whether the customer chooses delivery to home or pick‑up in store, taxes are handled appropriately based on the combination of stock origin and delivery destination.

  • Cancellations and returns
    If an order is cancelled before shipping, or items are later returned and refunded, OneStock automatically updates Avalara (voiding or refunding taxes as needed).

Who is this connector for?

This connector is aimed at retailers and brands entering or scaling in the US market who:

  • Want to deploy or extend ship‑from‑store and Order in Store

  • Need a reliable, automated way to handle US sales taxes in a complex omnichannel environment

  • Prefer to reduce internal tax and IT effort, relying on Avalara’s tax engine and OneStock’s orchestration logic

The following sections of this page provide the technical and configuration details for your project and IT teams.