A method of video decoding can include determining a prediction mode of a current coding unit (CU), and determining values of a transform unit (TU) coded block flag (CBF) of a Cb transform block, denoted tu_cbf_cb, and a TU CBF of a Cr transform block, denoted tu_cbf_cr, determining a context index, denoted ctxIdx, based on the prediction mode of the current CU and the values of the tu_cbf_cb, and the tu_cbf_cr, and performing an arithmetic decoding process according to a context model indicated by the ctxIdx to determine a bin of a joint Cb Cr residual (JCCR) flag indicating whether residual samples for both Cb and Cr chroma components of the current CU are coded as a single transform block.