In its case filed before the Commercial High Court, Smartmatic claims the commission decided to pay for the contract in Kenyan shillings, instead of the agreed US dollars.
A lawyer has sued IEBC, alleging it unlawfully extended a contract with Smartmatic International Holdings to manage technology for the 2027 General Election.
The United opposition leaders want IEBC to sever ties with Smartmatic, citing concerns that the company has been the subject of investigations over systems allegedly prone to manipulation.