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The max length of IP datagram is 65,535 Bytes which includes 20 Bytes fixed header(min) and IP payload. So the max size of IP payload(TCP segment) could be 65,535-20=65,515 Bytes

TCP header is fixed 20 Bytes(min). So max TCP payload is 65,515-20=65,495 Bytes
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max TCP payload= max window size- (minimun TCP header size + minimum IP header size)

         =here max window size  (2^16)-1      and min TCP header size is 20 bytes and min IP header size is also 20 bytes

        =655535 – (20+20)

        =65495 bytes

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