The Impact of Capital Regulations on Bank Margins of ASEAN Banking Sector

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Fatin Nur Hidayah Taib Khan
Nurhafiza Abdul Kader Malim
Tajul Ariffin Masron
Rossazana Ab Rahim


Basel Committee on banking supervision (BCBS) has issued Basel which requires the banks to comply with the minimum capital requirement after the crisis. Nevertheless, whether the requirement imposes impact the banking sector which comprises a dual banking system, in a positive manner is still questionable. Given the higher capital costs from the strict capital requirements, banks are being forced to raise bank margins. This study investigates the effect of capital regulations on conventional and Islamic banks’ margins covering the ASEAN banking system from 2009 to 2017. The empirical analysis uses dynamic panel data frameworks to reveal several factors affecting bank margins. Overall, the results suggest that the total regulatory capital ratio helps reduce the margins of conventional banks but does not influence the margins of Islamic banks. As for the Tier-1 capital ratio, the variable increases the Islamic bank margins but does not significantly affect conventional bank margins. Based on the analysis results, regulators of conventional banks need to impose capital requirements as suggested by Basel III to reduce bank margins. Meanwhile, as for Islamic banks, the bank margins can be reduced if regulators can introduce a separate set of requirements tailored explicitly for Islamic banks.

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The Impact of Capital Regulations on Bank Margins of ASEAN Banking Sector. (2023). Asian Academy of Management Journal of Accounting and Finance, 19(2), 71-104.


Abbas, F., Iqbal, S., & Aziz, B. (2019). The impact of bank capital , bank liquidity and credit risk on profitability in post-crisis period: A comparative study of US and Asia. Cogent Economics & Finance, 7(1), 1605683.

Abdel Reda, I., Rjoub, H., & Abu Alrub, A. (2016). The determinants of banks’ profitability under basel regulations: Evidence from Lebanon. International Journal of Economics and Finance, 8(10), 206.

Alam, N., Zainuddin, S. S., & Rizvi, S. A. R. (2018). Ramifications of varying banking regulations on performance of Islamic Banks. Borsa Istanbul Review, 19(1), 49– 64.

Allen, L. (1988). The determinants of bank interest margins: A note. The Journal of Financial and Quantitative Analysis, 23(2), 231–235.

Anderson, T. W., & Hsiao, C. (1981). Estimation of dynamic models with estimation error components. Journal of the American Statistical Association, 76(375), 598–606.

Angbazo, L. (1997). Commercial bank net interest margins, default risk, interest-rate risk, and off-balance sheet banking. Journal of Banking & Finance, 21(1), 55–87.

Angelini, P., Clerc, L., Curdia, V., Gambacorta, L., Gerali, A., Locarno, A., Motto, R., Roeger, W., Van den Heuvel, S., & Vlcek, J. (2015). Basel III: Long-term impact on economic performance and fluctuations. The Manchester School, 83(2), 217– 251.

Arellano, M., & Bond, S. (1991). Some tests of specification for Panel Carlo application to data: Evidence and an employment equations. Review of Economic Studies, 58(2), 277–297.

Arellano, M., & Bover, O. (1995). Another look at the instrumental variable estimation of error-components models. Journal of Econometrics, 68, 29–51.

Bank of International Settlements. (2013). Basel III phase in arrangements. Retrieved from

Barajas, A., Steiner, R., & Salazar, N. (1999). Interest spreads in banking in Colombia, 1974–96. International Monetary Fund Staff Papers, 46(2), 196–224.

Barth, J. R., Caprio Jr., G., & Levine, R. (2004). Bank regulation and supervision: What works best? Journal of Financial Intermediation, 13(2), 205–248.

Barth, J. R., Caprio Jr., G., & Levine, R. (2008). Bank regulations are changing: For better or worse? Comparative Economic Studies, 50, 537–563.

Barth, J. R., Caprio Jr., G., & Levine, R. (2013). Bank regulation and supervision in 180 countries from 1999 to 2011 (Working Paper No. 18733), National Bureau of Economic Research. Retrieved from

Basel Committee on Banking Supervision (2011). Basel III: A global regulatory framework for more resilient banks and banking systems (Revised Version June 2011). Bank for International Settlements.

Beck, T., Demirgüç-Kunt, A. & Merrouche, O. (2013). Islamic vs. conventional banking: Business model, efficiency and stability. Journal of Banking and Finance, 37(2), 433–447.

Berger, A. N., & Bouwman, C. H. S. (2013). How does capital affect bank performance during financial crisesα. Journal of Financial Economics, 109(1), 146–176.

Birchwood, A., Brei, M., & Noel, D. (2017). Interest margins and bank regulation in Central America and the Caribbean. Journal of Banking & Finance, 85, 56–68.

Bitar, M., Pukthuanthong, K., & Walker, T. (2017). The effect of capital ratios on the risk, efficiency and profitability of banks: Evidence from OECD countries. Journal of International Financial Markets, Institutions and Money, 23, 227–262.

Bougatef, K., & Korbi, F. (2018). The determinants of intermediation margins in Islamic and conventional banks. Managerial Finance, 44(6), 704–721.

Boukhatem, J., & Moussa, F. B. (2018). The effect of Islamic banks on GDP growth: Some evidence from selected MENA countries. Borsa Istanbul Review, 18(3), 231–247.

Brambor, T., Clark, W. R., & Golder, M. (2006). Understanding interaction models: Improving empirical analyses. Political Analysis, 14, 63–82.

Carbó Valverde, S., & Rodríguez Fernández, F. (2007). The determinants of bank margins in European banking. Journal of Banking & Finance, 31, 2043–2063.

Chortareas, G. E., Girardone, C., & Ventouri, A. (2012). Bank supervision, regulation, and efficiency: Evidence from the European Union. Journal of Financial Stability, 8(4), 292–302.

Cruz-garcía, P., & Fernández De Guevara, J. (2019). Determinants of net interest margin: The effect of capital requirements and deposit insurance scheme. The European Journal of Finance, 6(11), 1102–1123.

Dabla-Norris, E., & Floerkemeier, H. (2007). Bank efficiency and market structure: What determines banking spreads in Armenia? International Monetary Fund Working Papers WP/07/134, International Monetary Fund.

De Bandt, O., Camara, B., Maitre, A., & Pessarossi, P. (2016). Optimal capital, regulatory requirements and bank performance in times of crisis: Evidence from France. Journal of Financial Stability, 39, 175–186.

Demirguc-Kunt, A., Laeven, L., & Levine, R. (2004). Regulations, market structure, institutions, and the cost of financial intermediation. Journal of Money, Credit, and Banking, 36(3b), 593–622.

Entrop, O., Memmel, C., Ruprecht, B., & Wilkens, M. (2015). Determinants of bank interest margins: Impact of maturity transformation. Journal of Banking and Finance, 54(June), 1–19.

Fianto, B. A., Gan, C., Hu, B., & Roudaki, J. (2018). Equity financing and debt-based financing: Evidence from Islamic microfinance institutions in Indonesia.

Pacific-Basin Finance Journal, 52, 163-172.

Gee, C. S., Isa, C. R., & Noman, A. H. M. (2017). Does competition improve financial stability of the banking sector in ASEAN countries? An empirical analysis. PLoS ONE, 12(5), 1–27.

Hamza, H. (2016). Does investment deposit return in Islamic banks reflect PLS principle? Borsa Istanbul Review, 16(1), 32–42.

Hasan, M., & Dridi, J. (2010). The effects of the global crisis on Islamic and conventional banks: A comparative study. IMF Working Paper, WP/10/201, International Monetary Fund.

Hassan, M. K., & Dicle, M. F. (2005). Basel II and regulatory framework for Islamic banks. Journal of Islamic Economics, Banking and Finance, 1(1), 1–16.

Hawtrey, K., & Liang, H. (2008). Bank interest margins in OECD countries. The North American Journal of Economics and Finance, 19(3), 249–260.

Ho, T. S. Y., & Saunders, A. (1981). The determinants of bank interest margins: Theory and empirical evidence. Journal of Financial and Quantitative Analysis, 16(04), 581–600.

Huang, F.-W., Chen, S., & Tsai, J.-Y. (2018). Optimal bank interest margin under capital regulation: Bank as a liquidity provider provider. Journal of Financial Economic Policy, 11(2), 158–173.

Hutapea, E. G., & Kasri, R. A. (2010). Bank margin determination: A comparison between Islamic and conventional banks in Indonesia. International Journal of Islamic and Middle Eastern Finance and Management, 3(1), 65–82.

Ibrahim, M. H., & Law, S. H. (2019). Financial intermediation cost in dual banking system: The role of Islamic banking. Bulletin of Monetary Economics and Banking, 22(4), 529–550.

Ibrahim, M. H., Salim, K., Abojeib, M., & Yeap, L. W. (2018). Structural changes, competition and bank stability in Malaysia’s dual banking system. Economic Systems, 43(1), 111–129.

Iloska, N. (2014). An analysis of bank profitability in Macedonia. Journal of Applied Economics and Business, 2(1), 31–50.

Karim, M. A., Hassan, M. K., Hassan, T., & Mohamad, S. (2014). Capital adequacy and lending and deposit behaviors of conventional and Islamic banks. Pacific-Basin Finance Journal, 28, 58-75.

Khasawneh, A. Y. (2016). Vulnerability and profitability of MENA banking system: Islamic versus commercial banks. International Journal of Islamic and Middle Eastern Finance and Management, 9(4), 454–473.

King, M. R. (2013). The Basel III net stable funding ratio and bank net interest margins. Journal of Banking and Finance, 37(11), 4144–4156.

Korbi, F., & Bougatef, K. (2017). Regulatory capital and stability of Islamic and conventional banks. International Journal of Islamic and Middle Eastern Finance and Management, 9(3), 134–149.

Kosmidou, K. (2008). The determinants of banks’ profits in Greece during the period of EU financial integration. Managerial Finance, 34(3), 146–159.

Lee, C.-S., & Park, C. (2009). Beyond the crisis: Financial regulatory reform in emerging Asia. ADB Working Paper Series on Regional Economic Integration No. 34, Asian Development Bank.

Lee, K., & Lu, W. (2015). Do bank regulation and supervision matter? Journal of Financial Economic Policy, 7(3), 275–288.

Lee, S. P., & Isa, M. (2017). Determinants of bank margins in a dual banking system. Managerial Finance, 43(6), 630–645.

Lin, J., & Chen, S. (2018). Bank interest margin, multiple shadow banking activities and capital regulation. International Journal of Financial Studies, 6(3), 63.

López-Espinosa, G., Moreno, A., & Pérez de Gracia, F. (2011). Banks’ net interest margin in the 2000s: A macro-accounting international perspective. Journal of International Money and Finance, 30(6), 1214–1233.

Maikabara, A. A. (2019). Why Islamic banks focus more on debt-based financing than equity-based which is more shariah compliant? SSRN. ssrn.3492835

Mateev, M., & Bachvarov, P. (2021). Regulation, ownership and bank performance in the MENA region: Evidence for Islamic and conventional banks. Emerging Markets Review, 47, 100789.

Maudos, J., & Fernández De Guevara, J. (2004). Factors explaining the interest margin in the banking sector of the European Union. Journal of Banking and Finance, 28, 2259–2281.

Maudos, J., & Solís, L. (2009). The determinants of net interest income in the Mexican banking system: An integrated model. Journal of Banking and Finance, 33(10), 1920–1931.

Mejia, A. L., Aljabrin, S., Awad, R., Norat, M., & Song, I. (2014). Regulation and supervision of Islamic banks. International Monetary Fund Working Paper WP/14/219, International Monetary Fund.

Meslier, C., Risfandy, T., & Tarazi, A. (2017). Dual market competition and deposit rate setting in Islamic and conventional banks. Economic Modelling, 63(February), 318–333.

Mia, M. R. (2023). Market competition, capital regulation and cost of financial intermediation: An empirical study on the banking sector of Bangladesh. Asian Journal of Economics and Banking, 7(2), 251–276.

Miles, D., Yang, J., & Marcheggiano, G. (2013). Optimal bank capital. The Economic Journal, 123(567), 1–37.

Modigliani, F., & Miller, M. H. (1958). The cost of capital, corporation finance, and the theory of investment. American Economic Review, 48, 261–297

Naceur, S. B., & Kandil, M. (2009). The impact of capital requirements on banks’ cost of intermediation and performance: The case of Egypt. Journal of Economics and Business, 61(1), 70-89.

Nguyen, Q. T. T., Gan, C., & Li, Z. (2019). Bank capital regulation: How do Asian banks respond? Pacific-Basin Finance Journal, 57, 101196.

Olson, D., & Zoubi, T. (2017). Convergence in bank performance for commercial and Islamic banks during and after the Global Financial Crisis. The Quarterly Review of Economics and Finance, 65, 71–87.

Poghosyan, T. (2013). Financial intermediation costs in low income countries: The role of regulatory, institutional, and macroeconomic factors. Economic Systems, 37(1), 92–110.

Qi, M., & Yang, Y. (2016). The determinants of bank interest margins: A short-term funding perspective. Applied Economics and Finance, 4(1), 127–137.

Rahman, M. M., Hamid, M. K., & Khan, M. A. M. (2015). Determinants of bank profitability: Empirical evidence from Bangladesh. International Journal of Business and Management, 10(8), 135.

Rahman, M. M., Rahman, M., & Masud, M. A. K. (2023). Determinants of the cost of financial intermediation: Evidence from emerging economies. International Journal of Financial Studies, 11(1), 11.

Rahman, M. M., Zheng, C., Ashraf, B. N., & Rahman, M. M. (2018). Capital requirements, the cost of financial intermediation and bank risk-taking: Empirical evidence from Bangladesh. Research in International Business and Finance, 44, 488–503.

Saunders, A., & Schumacher, L. (2000). The determinants of bank interest rate margins: An international study. Journal of International Money and Finance, 19(6), 813– 832.

Sirait, R. A., & Rokhim, R. (2019). Capital adequacy requirement, the cost of financial intermediation and risk taking behavior of the indonesia banking sector. In 12th International Conference on Business and Management Research (ICBMR 2018) (pp. 99–104). Atlantis Press.

Soedarmono, W., & Tarazi, A. (2015). Competition, financial intermediation and riskiness of banks: Evidence from the Asia-Pacific region. Emerging Markets Finance and Trade, 52(4), 961–974.

Nguyen, Q. T. T., Gan, C., & Li, Z. (2019). Bank capital regulation: How do Asian banks respond? Pacific-Basin Finance Journal, 57, 101196.

Trinugroho, I., Agusman, A., & Tarazi, A. (2014). Why have bank interest margins been so high in indonesia since the 1997/1998 financial crisis? Research in International Business and Finance, 32, 139–158.

Trinugroho, I., Risfandy, T., & Ariefianto, M. D. (2018). Competition, diversification, and bank margins: Evidence from Indonesian Islamic rural banks. Borsa Istanbul Review, 18(4), 349–358.

Wong, K. P. (1997). On the determinants of bank interest margins under credit and interest rate risks. Journal of Banking and Finance, 21(2), 251–271.

World Bank (2019). World Development Indicators, World Bank database.

Xu, L., Lee, S. C., & Fu, Y. (2015). Impacts of capital regulation and market discipline on capital ratio selection: Evidence from China. International Journal of Managerial Finance, 11(3), 270–284.

Yanikkaya, H., Gumus, N., & Pabuccu, Y. U. (2018). How profitability differs between conventional and Islamic banks: A dynamic panel data approach. Pacific-Basin Finance Journal, 48, 99–111.

Zarruk, E. R. (1989). Bank spread with uncertain deposit level and risk aversion. Journal of Banking & Finance, 13(6), 797–810.

Zheng, C., Rahman, M., Begum, M., & Ashraf, B. (2017). Capital regulation, the cost of financial intermediation and bank profitability: Evidence from Bangladesh. Journal of Risk and Financial Management, 10(2), 9. jrfm10020009