# Diadoc for 1C in 2026: Versions, UPD 5.03, MChD

Canonical: https://kt.team/blog/diadoc-1c-integration

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements

## Overview

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements

## Business context

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements

## Implementation notes

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements

## How KT.Team helps

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements

## Next step

What changed in the Diadoc module for 1C by 2026: version 4.59+, 22% VAT, transition to UPD 5.03, mandatory MChD, and end of 1C 7.7 support. Requirements