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Additive
Cloud-based K-1 tax data extraction for accountants
Table of Contents
Additive - 2026 Pricing, Features, Reviews & Alternatives
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Last updated: October 2026
Additive overview
What is Additive?
Additive is a cloud-based web application that extracts tax data from K-1 PDFs and related forms into structured Excel workbooks, built for tax professionals, accountants, and investment partnerships managing high volumes of pass-through entity documents. Additive supports batch processing of K-1s across multiple entity types, automating the translation of unstructured PDF data into organized, formula-ready spreadsheets that integrate directly into existing tax workflows.
Beyond core extraction, Additive provides validation layers that flag inconsistencies and missing fields before data reaches downstream systems, reducing manual review cycles. The platform handles a range of K-1 form variants, including those issued by partnerships, S-corporations, and trusts, making it applicable across diverse client portfolios. Additive is accessed entirely through a web browser with no local installation required, allowing tax teams to process documents from any location while maintaining centralized data output and audit trails.
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Additive’s user interface
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Additive's key features
Most critical features, based on insights from Additive users:
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Additive support options
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