Prepared by A-J | Author brand: 盡職生活｜阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
Key point: A stock-backed loan combines market-price risk with debt. Maintenance and call thresholds must come from your actual contract.
Do not memorize one percentage
Different providers can use different maintenance ratios, warning levels, and call rules. A widely quoted number should not be assumed to apply to every stock-backed loan.
A current securities-finance formula example
Current Yuanta Securities Finance rules define account maintenance ratio as collateral plus supplemental collateral divided by loan amount plus accrued interest, multiplied by 100%.
140% is a product-rule example, not a universal standard
Under those current rules, a ratio below 140% triggers a collateral call process. Banks and brokers may use different contractual thresholds.
Stress testing matters more than today’s ratio alone
Model 10%, 20%, 30%, and 40% collateral declines and compare the resulting ratio with your own contract threshold.
What to check before borrowing
- Provider and any restrictions on loan use
- Advance rate, interest rate, term, and renewal rules
- Maintenance formula, call threshold, deadline, and cure level
- Whether collateral can be sold / substituted and liability for any shortfall after disposal
Primary / official sources
This page does not recommend any stock, bank, broker, or loan. Formal terms depend on the provider contract and current rules.