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These estimates can be used to investigate the link between observed active galactic nuclei (AGN) emission properties and the underlying accretion physics of their supermassive black holes. However, while optical and core radio emission trace the ongoing accretion episode, extended jet and lobe structures may result from past AGN activity. Therefore, accretion rates inferred from spatially unresolved radio observations may be systematically overestimated, a bias whose prevalence and extent have yet to be thoroughly explored. In this study, using a sample of 121 local radio-loud galaxies with spatially resolved radio components, we assess this effect by estimating their Eddington-scaled accretion rates ($\\lambda$) using both the common methodology which considers total radio fluxes and a simple but novel approach that treats core and extended emission as signatures of distinct accretion phases. Our results show that the former method systematically overestimates the $\\lambda$ by a factor of $\\sim 3$, affecting the accretion mode classification in approximately $11{{\\ \\rm per\\ cent}}$ of sources. This discrepancy appears to correlate with radio size, with the most extended galaxies indicating a transition in accretion disc mode. Such a bias could affect AGN classification in unresolved high-redshift radio surveys. Our results motivate re-examining accretion rate calculations from AGN radio surveys and align with the AGN unification model for radio galaxies, revealing a clearer link between accretion disc physics and optical spectral properties.<\/jats:p>","DOI":"10.1093\/mnras\/staf1724","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T12:24:07Z","timestamp":1759926247000},"page":"4335-4341","source":"Crossref","is-referenced-by-count":0,"title":["The effect of extended radio emission on SMBH accretion rate estimates"],"prefix":"10.1093","volume":"543","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7948-5714","authenticated-orcid":false,"given":"Stergios","family":"Amarantidis","sequence":"first","affiliation":[{"name":"Institut de Radioastronomie Millim\u00e9trique (IRAM) , Avenida Divina Pastora 7, Local 20, E-18012 Granada ,","place":["Spain"]}]},{"given":"Duncan","family":"Farrah","sequence":"additional","affiliation":[{"name":"University of Hawai\u2019i at Manoa Department of Physics and Astronomy, , 2505 Correa Rd., Honolulu, HI 96822 ,","place":["USA"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3506-5536","authenticated-orcid":false,"given":"Nick","family":"Seymour","sequence":"additional","affiliation":[{"name":"International Centre for Radio Astronomy Research, Curtin University, Turner Avenue , Bentley, WA 6102 ,","place":["Australia"]}]},{"given":"Mark","family":"Lacy","sequence":"additional","affiliation":[{"name":"National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville, VA 22903 ,","place":["USA"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3764-5780","authenticated-orcid":false,"given":"Iris","family":"Breda","sequence":"additional","affiliation":[{"name":"University of Vienna Department of Astrophysics, , T\u00fcrkenschanzstra\u00dfe 17, A-1180 Vienna ,","place":["Austria"]}]},{"given":"Bodo","family":"Ziegler","sequence":"additional","affiliation":[{"name":"University of Vienna Department of Astrophysics, , T\u00fcrkenschanzstra\u00dfe 17, A-1180 Vienna ,","place":["Austria"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1558-5289","authenticated-orcid":false,"given":"Olmo","family":"Piana","sequence":"additional","affiliation":[{"name":"University of Modena and Reggio Emilia Department of Physics, Informatics and Mathematics, , I- 41125 Modena ,","place":["Italy"]},{"name":"National Taiwan Normal University Department of Physics, , No. 88, Section\u00a04, Tingzhou Road, Taipei 116 ,","place":["Taiwan, R. 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