Parliament - The cost of borrowing has remained stable over the past month, Deputy Finance Minister Nhlanhla Nene said on Wednesday.
Replying to questions in the National Assembly, Nene could not quantify the exact impact of downgrades by ratings agencies Moody's, and Standard and Poor's, on the fiscus.
He said a number of global and domestic factors meant it would be difficult to determine precise figures.
"High levels of global liquidity, low returns in developed countries... domestic factors such as wildcat strikes and electricity constraints may have affected the performance of important market indicators such as the currency and equity markets," said Nene.
Democratic Alliance MP Tim Harris said he did his own "back of the envelope calculation".
"We issued R21bn worth of debt yesterday... If the downgrade cost us 20 basis points that would increase our debt repayment by R60m," said Harris.
Nene countered with what he called "front envelope calculations".
"The foreign flows, net bond purchases by foreigners since the Moody's downgrade have totalled R9.5bn.
"This has been a net sale of R6.8bn worth of equities," said Nene.
Nene said Treasury calculations showed the cost of borrowing for government had not seen any major moves.
"The cost of borrowing foreign currency has also increased somewhat at a much smaller margin of 0.1 percentage points," said Nene.
Asked what he expected from ratings agency Fitch, who was expected only do its grading after the ANC's elective conference in December, Nene predicted an upgrade.