Although they remain a relatively small proportion of all identified sex offenders, there is increasing concern about individuals with offenses relating to indecent images of children (IIOC) online. This study examined the reoffending rates of a sample of IIOC-only (n = 584, 84.6%) and mixed IIOC-contact (n = 106, 15.4%) offenders who participated in a U.K. community intervention and the predictive validity of risk and psychological assessment outcomes. Proven reoffending rates were 24.8% for any reconviction and 12.6% for sexual reconvictions after a 13-year average follow-up. Rates differed significantly, with the mixed group 2 times more likely to receive any reconviction and 3 times more likely to receive a sexual reconviction. Only 2.7% of the IIOC-only group was convicted of a subsequent contact offense. Prior general offenses were found to be significantly predictive of general reconviction and prior sexual convictions were significantly predictive of sexual convictions, albeit with weak predictive power. Reliable change on treatment "domains" was not predictive of either general or sexual reconvictions. While lower reconviction rates do not minimize the seriousness of IIOC use, these findings highlight the need for comprehensive assessment of proven and self-reported offending history to make sound risk decisions and the need for larger samples with longer follow-ups and comparisons between detected and undetected IIOC users. The findings also raise questions about the nature and efficiencies related to treatment for a population in which rates of reconviction appear to be relatively low. (PsycINFO Database Record (c) 2019 APA, all rights reserved).