This paper examines the financial impact of nonprofit marketing expenditures using a longitudinal panel analysis of IRS Form 990 filings from 2013 to 2023. While nonprofit marketing has been a subject of debate—balancing concerns over commercialization against its potential for financial sustainability—my research seeks to provide empirical evidence on its effectiveness. By analyzing marketing expenses, revenue streams, and efficiency metrics across a broad sample of 501(c)(3) organizations, this paper identifies trends in marketing spending by nonprofit type, geographic distribution, and financial outcomes. Findings will contribute to the growing literature on nonprofit performance measurement, offering insights into whether marketing is a strategic asset or an administrative overhead burden in the nonprofit sector.