A terminal apparatus that communicates with a base station apparatus includes a configuration unit that sets a first configuration, a second configuration, and a third configuration. The configuration unit starts or restarts the timer when setting the third configuration, and the configuration unit clears/discards the third configuration when the timer expires. The first configuration is used to determine correspondence between a subframe in which PDCCH is arranged and a subframe in which PUSCH corresponding to the PDCCH is arranged, the second configuration is used to determine correspondence between a subframe in which PDSCH is arranged and a subframe in which a HARQ-ACK corresponding to the PDSCH is transmitted, and the third configuration is used to specify an uplink subframe in which uplink transmission is possible.