"Members of the national executive of government submit their disclosures to the secretary of Cabinet who maintains a register," spokesperson Mac Maharaj said in a statement on Wednesday.
"The president therefore submits his disclosure annually to the secretary of Cabinet."
He was responding to a challenge from Agang SA leader Mamphela Ramphele on Wednesday to Zuma to reveal details about his personal wealth."
"I call upon President Zuma to publish his accounts immediately. What is there to hide?" she asked reporters in Johannesburg at the time.
"South Africans deserve a president that sets a good example for the rest of the country to follow."
Maharaj said: "The Constitution of 1996 and the Executive Members Ethics Act, 1998, prescribe the nature, content and form in which members of the Cabinet and the executive councils disclose their financial interests annually".
Ramphele claimed that Zuma had avoided revealing these details.
"President Zuma has used a convenient technicality to side-step this requirement. From his inauguration … the president has dodged the issue for over 1 565 days to date. With each passing day suspicion about his integrity mounts," she said.
Ramphele's net worth
She said she was disclosing her own financial affairs for the country to scrutinise, in line with the need for accountability, and to set an example for Zuma.
Ramphele said her net worth as of June 27 this year was R55 436 063.
She had shares worth R1.38-million with Anglo American, Gold Fields, Sibanye Gold, and the PTI Select Managers Fund.
Her primary residence in Camps Bay, Cape Town, was valued at R10-million. A total of R1 146 139 was in retirement annuity and R1 574 064 in a provident fund.
Her family trust held R30-million and her investment trust R10.9-million.
"My income for the tax year ending 28 February 2013, was R346 000 – a sizeable drop from previous years due to my resignation from all board commitments … ahead of my entrance into politics."
Ramphele said her wealth would not distance her from South Africa's poor. – Sapa