This chapter presents finite blocklength analyses for point-to-point mismatched joint source-channel coding. A novel code is proposed by combining codes for mismatched channel coding and source coding via the idea of unequal error protection. The coding scheme can be used to transmit an arbitrary memoryless source over an additive arbitrary noise channel, and the low-latency performance of such coding scheme is analyzed. A take-home message is that separate source-channel coding is optimal when the latency is infinite for mismatched communication, while the low-latency performance of mismatched JSCC is much better. The readers can learn coding schemes for mismatched joint source-channel coding and its low-latency theoretical performance.