Thailand: Financial System Stability Assessment; imf country Report No. 19/308; September 10, 2019
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Banking Sector: Solvency Risk Domain Assumptions Top-Down by Authorities Top-down by FSAP Team on model (fees and commissions) and expert judgment (other expenses). Behavioral adjustments • Growth rate of loans and interest- bearing liabilities (deposits and other borrowings) estimated via VAR with macro factors. • Growth of equity holdings assumed to be either zero (for banks showing no significant variation in the size of holdings across time) or via OLS with the return on stock index as explanatory variable (other banks). • Share of bond holdings (over total assets) estimated as an inverse relationship with the loans/assets share. • Non-interest-bearing liabilities modeled as a function of total liabilities. • Net open position in FX (NOP) projected as historical long-term average of year- on-year NOP. • Dividend payout based on historical experience. • Credit growth for the whole banking system estimated as a function of domestic demand and unemployment; portfolio allocation constant over the horizon. • Dividend payout judgmental, based on historical experience, with limits on distribution in case of breach of capital buffers. 5. Regulatory and Market- Based Standards and Parameters Calibration of risk parameters • PDs and LGDs: point in time for credit losses. RWA estimated via regression models. • PDs and LGDs: point in time for both credit losses and stressed RWA calculations. Regulatory/ Accounting and Market-Based Standards • Hurdle rates: capital (CET1, T1, CAR). • RWAs for credit risk are modeled at aggregate level, separately for performing and NPLs: via a regression of credit risk weights on macro factors; via a regression of credit risk weights over specific provision over NPL and the share of retail NPL over total NPLs, respectively. • Hurdle rates: capital (CET1, T1, CAR) requirements (inclusive of Capital Conservation Buffer) and leverage ratio requirements as per local regulation (largely implementing Basel III); D-SIB capital surcharge included for domestic systemically important banks. • RWAs evolving according to assumed credit growth, net of increase in provisions; the latter is modeled via changes in PD/LGD for IRB exposures and the increase in NPLs for non- IRB exposures. |
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