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HMRC outlines MTD API migrations and 2026 developer deadlines

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  • HMRC’s September newsletter updates developers on MTD API changes, guidance and customer communications.
  • 16 October 2026 is the retirement date for individuals-capital-gains-income-api v2 and individuals-reliefs-api v2.
  • The roadmap was updated through September 2027, while developer events continue into November 2026.
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