"The CIPS is ready now and China has selected 20 banks to do the testing, among which 13 banks are Chinese banks and the rest are subsidiaries of foreign banks," said a senior banking source who is involved in the matter.
"The official launch will be in September or October, depending on the results of the testing and preparation," the source added.
A second source said authorities want to launch the first phase of CIPS before December.
The launch of CIPS will enable companies outside China to clear yuan transactions with their Chinese counterparts directly, reducing the number of stages a payment has to go through.
The People's Bank of China was not immediately available for comment.