A groundbreaking High Court decision has delivered posthumous justice to the estate of assassinated Kenyan lawyer Mathew Kyalo Mbobu, offering crucial lessons about borrower protection under Kenya’s in duplum rule—a legal principle that could shield thousands from predatory lending practices.
Understanding the In Duplum Rule in Kenya
The in duplum rule is a statutory protection embedded in Kenya’s financial regulations that caps interest accumulation on defaulted loans. Once a borrower has repaid double the original principal amount, no additional interest or penalties can legally accrue. This principle, recognized in the Banking Act and Kenyan common law, serves as a critical safeguard against exploitative lending.
The Mbobu Case: A Warning Against Unconscionable Terms
In January 2021, Hypac Investments Limited extended an Sh11 million facility to Mbobu carrying a 15% monthly interest rate—equivalent to 180% annually—alongside 5% weekly default penalties. High Court Justice Moses Otieno Ado described these terms as “unconscionable, oppressive, exploitative, and contrary to public policy” in his November 2025 judgment.
Despite repaying Sh22 million (double the principal), the lender demanded an additional Sh69.4 million. The court ruled that once the Sh22 million threshold was reached, the debt became fully extinguished under the in duplum rule.
All excessive interest clauses were voided, the charge on Mbobu’s family property was cancelled, and the title was ordered released within 30 days.
The Unsolved Questions
Tragically, Mbobu was killed in a drive-by shooting on September 9, 2025, along Nairobi’s Magadi Road—just weeks before judgment was delivered. The circumstances surrounding his assassination remain unresolved, raising questions about whether his debt struggles or professional activities played any role. His estate was substituted as plaintiff to complete the proceedings.
Background: COVID-19 and Desperate Borrowing
The court noted that Hypac Investments exploited Mbobu’s financial distress during the COVID-19 pandemic, when many professionals faced unprecedented economic pressure. This context highlights how vulnerable borrowers become targets for predatory lenders.
The Broader Impact on Kenya’s Lending Landscape
This ruling strengthens judicial enforcement of borrower protections at a time when digital lenders and informal shysters routinely impose interest rates exceeding 100–400% annually. Legal analysts view it as one of the most emphatic applications of the in duplum rule to date, potentially benefiting thousands trapped in similar debt spirals.
The Central Bank of Kenya has been working to regulate digital lending platforms, but enforcement gaps persist. Cases like Mbobu’s demonstrate the judiciary’s willingness to intervene when lenders overstep legal boundaries.
Key Gaps and Consumer Education Needs
Despite this victory, significant questions remain:
- How can borrowers identify exploitative terms before signing loan agreements?
- What enforcement mechanisms exist to prevent lenders from circumventing the in duplum rule?
- How widespread are similar exploitative loans across Kenya’s informal lending sector?
The Law Society of Kenya and consumer advocacy groups have called for greater public awareness about borrower rights under the Banking Act and the availability of legal remedies against predatory practices.
What Borrowers Should Know
If you’ve repaid double your original loan amount but still face demands for more, you may have grounds to invoke the in duplum rule. Consider seeking legal advice or contacting the Central Bank’s consumer protection unit for guidance.
The Mbobu ruling serves as both a cautionary tale and a beacon of hope—demonstrating that Kenya’s courts will stand against financial exploitation, even when justice comes too late for the victim to witness it.
