On a $1,000,000 home loan at 25-year tenure, a 1 percentage point rise in the all-in mortgage rate increases monthly repayment by approximately $560 and total interest paid over the loan life by roughly $97,000. When 3-month compounded SORA rose from 0.2% in January 2022 to 3.7% by December 2023 — a 3.5-point swing — borrowers on floating-rate packages saw their monthly payments jump by $1,960 on a $1M loan. For homeowners already stretched at 55% TDSR, that move was the difference between a manageable loan and genuine financial stress. Tracking SORA is no longer optional for anyone with a floating-rate mortgage.
The single most important number this tracker gives you is the current 3-month compounded SORA, because that is the rate most banks use as the reset benchmark on floating-rate packages in Singapore. Add your bank's spread (shown in your loan letter, typically 0.8–1.2%) and you have today's effective mortgage rate — updated daily by MAS. When that number crosses your stress-test threshold (usually 4.0–4.5%), it is time to seriously model a refinancing to fixed rate.
The most common confusion is between the daily published SORA and the compounded SORA used in mortgage contracts. Daily SORA is the volume-weighted average rate of actual overnight borrowing transactions in Singapore's unsecured interbank market, published by MAS each morning. Compounded SORA is calculated by compounding that daily rate over 1, 3, or 6 months — the result is mathematically higher than a simple average because of daily compounding, and can diverge by 10–20 basis points in volatile periods. Some borrowers assume their rate is based on a simple average and are surprised when their reset statement shows a slightly higher figure. This tracker shows the compounded versions so you see exactly what your bank sees.
Once you know your current effective rate, run the numbers in the Mortgage Calculator to see your updated monthly payment, and use the Refinancing Calculator to evaluate whether switching to a fixed-rate package makes financial sense given current SORA levels and your remaining loan tenure.