African Bank, which is also known as Abil, said diluted headline earnings per share totalled 136.3c in the six months to end-March, compared with 113.7c a year earlier.
Headline EPS, which excludes some one-time and financial items, is the main measure of profit in South Africa.
The bank, which also owns a furniture business through which it makes loans to consumers, said it would pay a dividend of 85c, unchanged from the same period a year earlier.
The results were widely expected after Abil said this month it expected a 20% rise in first-half profit. That has put pressure on its shares, as analysts are expecting a 30% rise in full-year profit, according to Thomson Reuters data.
Abil has been carving a niche for itself by focusing on the lower-income consumers who were traditionally overlooked by SA's major commercial banks.
Shares of Abil are down nearly 12% so far this year, underperforming a slight decline in Johannesburg's Top-40 index of blue chips.