Medius Added Avalara Tax Integration to AP Workflow

The integration automates U.S. sales and use tax verification during invoice approval to flag incorrect charges.

Updated on Sept. 28, 2026 in Software

Isometric editorial illustration featuring a brass weight and balance scales next to shipping crates, representing automated financial accuracy. — Medius has integrated Avalara’s tax verification service into its accounts payable platform to automate U.S. sales and use tax checks before invoice approval. AI Illustration. Upload story photo >

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Medius has integrated Avalara AvaTax into its AP Automation platform to enable automated U.S. sales and use tax verification. This system checks vendor-charged taxes against Avalara data before invoices are posted to an ERP.

Why it matters

Automating tax verification during the approval process eliminates the need for costly post-payment recovery exercises. This integration addresses the financial risk of inaccurate vendor tax calculations for organizations operating across multiple U.S. jurisdictions.

The integration facilitates line-by-line tax validation across specific jurisdictions before payment approval. This replaces manual or post-hoc review processes with a system that automatically flags undercharges or overcharges within the standard Medius invoice workflow.

The players

Medius

A provider of AP automation software that centralizes invoice processing and financial workflows.

Avalara

A cloud-based compliance software company specializing in automated tax calculation and filing services.

The details

The integration works by intercepting vendor invoices during the Medius AP Automation approval cycle. It cross-references the tax calculated by the vendor against Avalara AvaTax services, which maintain a database of jurisdiction-specific tax rules. By verifying tax accuracy before the data hits the ERP, the system prevents erroneous payments that would otherwise require future reconciliation.

September 20-24, 2026: Medius exhibited the integration at the Avalara CRUSH 2026 conference.
September 28, 2026: Medius officially announced the availability of the Avalara AvaTax integration.

The Tech Race

This move marks a continued expansion by Medius to build a more robust tax and compliance stack, following a similar integration with Thomson Reuters ONESOURCE announced earlier in September 2026. The company is actively positioning its AP platform to consolidate third-party tax validation services into a single automated pipeline.

Accounts payable teams currently using Medius can now activate automated tax verification against Avalara data to reduce overpayment risks. This feature is designed for U.S.-based operations where jurisdiction-specific tax variances frequently create manual reconciliation burdens.

The takeaway

By automating tax validation, firms can move from reactive payment auditing to proactive transaction verification. Future observers should watch for Medius’s announced pipeline of additional tax and compliance system integrations expected in the coming quarters.