The rapid expansion of the Unified Payments Interface (UPI) has transformed India's payments landscape and reshaped how commercial banks manage cash-based operations. This study examines the relationship between UPI transaction value and ATM cash withdrawals at the State Bank of India (SBI), India's largest public sector bank, over the period 2020 to 2025. Using secondary data drawn from the Reserve Bank of India, the National Payments Corporation of India, and SBI annual reports, the study applies descriptive statistics, trend analysis, percentage share analysis, year-on-year comparative analysis, Compound Annual Growth Rate (CAGR), correlation, and regression analysis. Results show that SBI's UPI transaction value rose from ₹6.39 lakh crore in 2020 to ₹51.83 lakh crore in 2025 (CAGR of 52.24%), while ATM cash withdrawals declined marginally from ₹34.17 lakh crore to ₹31.23 lakh crore (CAGR of -1.74%). A weak negative correlation (r = -0.27) was observed between the two series, and regression analysis confirmed the relationship was not statistically significant at the 5% level, largely owing to the limited sample size (n = 6). The findings point to a directional, though not yet statistically robust, shift away from cash toward digital payments.