Percy Tau has a very good record in front of goal in the colours of the Bafana Bafana of South Africa. He has scored 13 goals in 32 appearances for South Africa when it comes to senior team football on the international stage.

Former Brighton and Hove Albion attacker Tau made his debut for South Africa during a 2016 African Nations Championship qualification match with Angola on October 17, 2015. Percy Tau was unable to prevent South Africa from losing 2-0 to Angola.

Tau scored his first international goal for South Africa against Guinea-Bissau on March 25, 2017. The forward received a yellow card two minutes before his goal. On October 13, 2018, Tau was one of the goalscorers as South Africa thumped Seychelles 6-0 in an African Cup of Nations qualifier. He scored one of the goals as South Africa recorded their biggest win on the international football stage. Percy Tau was part of the South Africa squad as they made history.

On March 24, 2019, Tau scored his first pair of goals for South Africa at the expense of Libya. He netted a brace to lead South Africa to a 2-1 win over the Libyans in a qualifier for the 2019 African Cup of Nations. His goals ensured that South Africa sealed a place in the 2019 African Cup of Nations. His brace against Libya took his tally to four goals during the 2019 African Cup of Nations qualifying campaign thus ranking him amongst the players with the most goals.

Having helped his country book a place in the 2019 edition of the African Cup of Nations, Tau was named in the squad for the tournament. He started all the three South Africa games in the group stage. The attacker also featured from the start for the two knockout stage games before the quarterfinal defeat to Nigeria denied his team a place in the last four of the tournament.