{"data":{"id":"us-mo/mo.-rev.-stat.-509.440","jurisdiction":"us-mo","citation":"Mo. Rev. Stat. § 509.440","heading":"When claim may be presented as counterclaim by supplemental pleading.","body":"A claim which either matured or was acquired by the pleader after serving his pleading may, with the permission of the court, be presented as a counterclaim by supplemental pleading.","path":["Title XXXV - CIVIL PROCEDURE AND LIMITATIONS","Chapter 509 - Pleadings"],"source_url":"https://revisor.mo.gov/main/OneSection.aspx?section=509.440","current_through":"2026 legislative session (floor)","vintage":"","retrieved_at":"2026-09-03T22:23:28Z","sha256":"94a24fe247c3de7db6a9246e52401dc8fbbc010d9dfc9343dcaacf91dd66ebba","source_id":"us-mo","stale":false,"prev":"us-mo/mo.-rev.-stat.-509.430","next":"us-mo/mo.-rev.-stat.-509.450"},"notice":"GroundRules: Original legal text. Not legal advice."}