Sustainability Report Disclosure Moderates the Relationship between Credit Growth and Bank Profitability in Vietnamese Commercial Banks

In the world of finance, banks are often seen as engines of growth, pumping money into the economy to help businesses expand and families buy homes. For decades, the primary measure of a bank's success was simple: how much profit it made. The logic was straightforward—lending more money usually meant earning more interest, which led to higher profits. However, the modern financial landscape has shifted. Today, banks are expected to do more than just generate wealth; they are increasingly asked to operate in ways that protect the environment and support society. This broader goal is known as sustainable development. To prove they are taking this seriously, many banks now publish sustainability reports. These documents act like a public ledger, detailing how the bank manages its impact on the planet, its treatment of employees, and its governance practices. The question that has puzzled researchers is whether this focus on sustainability helps a bank make money, or if it acts as a drag on its financial performance.

A researcher at the National Economics University in Vietnam set out to untangle this relationship, specifically looking at how the decision to publish a sustainability report changes the way a bank's lending growth translates into profit. The study focused on twenty-six listed commercial banks in Vietnam over a fourteen-year period, from 2011 to 2025. Vietnam offers a unique setting for this investigation because its economy relies heavily on bank loans, with credit making up a massive portion of the funding available to businesses and households. In this environment, the growth of bank lending is a critical driver of economic activity, but it also carries significant risks if not managed carefully. The researcher wanted to see if the act of disclosing sustainability information altered the traditional link between how fast a bank lends money and how much profit it keeps.

The study began by gathering data from the official websites of these banks, where they are required to post their annual financial statements. The researcher manually checked each bank's records to see if they had published a sustainability report in a given year, marking this as a simple yes or no. This information was then combined with financial data such as how much profit the bank made relative to its equity, the rate at which its loans were growing, and various measures of risk and efficiency. By using advanced statistical methods designed to handle data that changes over time and varies across different banks, the researcher could isolate the specific effect of sustainability reporting. The analysis accounted for the fact that banks are not all the same; some are much larger than others, and they all face the same economic ups and downs at the same time.

The findings revealed a nuanced story that challenges the idea that more lending always equals more profit. The research showed that when banks pursue sustainable development and disclose their efforts, the relationship between credit growth and profitability changes. In the past, expanding the volume of loans was a direct and efficient path to higher profits. However, in the context of banks that are actively managing sustainability, this expansion no longer converts into profit as efficiently as it used to. This suggests a trade-off: the resources and careful management required to ensure that lending is sustainable may slow down the immediate financial return on that growth. It is not that sustainability hurts the bank, but rather that the path to profit becomes more complex and less direct when a bank is committed to broader environmental and social goals.

Crucially, the study found that this effect is not the same for every bank. The impact of publishing a sustainability report depends heavily on the size of the bank, with the moderating effect of sustainability reporting varying between small and large commercial banks. This distinction is important because it implies that a one-size-fits-all approach to sustainability does not work in the banking sector. The research also included other factors, such as how well a bank manages its bad loans, its capital reserves, and its overall efficiency, as control variables to account for their potential influence on profitability alongside the main variables of interest.

What makes this study particularly significant is that it moves beyond asking simply whether sustainability is good or bad for profits. Instead, it investigates how the act of reporting on sustainability changes the mechanics of how banks make money. The results indicate that while the direct link between lending growth and profit weakens when sustainability is prioritized, this is a reflection of a deeper, more responsible approach to banking. It suggests that the trade-off between rapid growth and long-term stability is real and measurable. For policymakers and bank managers in Vietnam and beyond, the lesson is clear: the path to profitability in a sustainable economy is not just about lending more, but about lending smarter, even if that means the immediate financial rewards look different than they did in the past. The study provides a clear picture of how transparency and responsibility are reshaping the fundamental economics of the banking industry.