Unfunded, yet essential, study activities are a longstanding problem for the sustainability of studies and clinical research sites. These types of invoiceables, often called hidden costs, are typically not accounted for in the study budgeting process which can be detrimental to long-term site sustainability.  In this episode, David Vulcano, Honorary President, SCRS and Chris Hoyle, Executive Director, Elite Research Network, share information about the SCRS Site Invoiceables Toolkit created to help sites understand common billable items that a site should consider when assessing costs associated with a clinical trial.