<p>Couples who communicate well about finances might be better protected from feelings of stress about their finances even in periods when they experience drops in their available financial resources. Conversely, experiencing financial stress might impair effective and respectful communication about finances. A sample of partnered individuals in the U.K. (<i>N</i> = 487) reported general quality of financial communication, chronic financial worry, and ongoing sources of vulnerability (household income, account pooling, marital status, relationship length). The same individuals also reported fluctuations in cash deposits available in their bank account, financial stress, and financial communication on days throughout the one-month data collection period. Results are consistent with the Vulnerability Stress Adaptation Model. Individuals who communicate well with their partner about finances experienced less chronic financial worry overall and less subjective financial stress day to day (regardless of reported cash on hand in their bank account that day), suggesting that better communication with a romantic partner is an adaptive process. Notably, there was also evidence for the reverse link: those who generally worried more about finances (independent of household income) reported worse day to day communication about money with their partner. Additionally, this study also identified ongoing sources of vulnerability that are relevant for financial communication (pooling financial resources with the partner, marital status, and relationship length) and replicated the link between financial communication and relationship satisfaction. Overall, this study underlines the importance of considering financial variables in relationship research and relational context in research on personal finances.</p>