Mr Iyer pays a loan instalment every fortnight (every 14 days). His first payment is on the circled date. On which date is his 5th payment due?

The 5th payment is $4\times 14=56$ days after 6 April 2028. April has 24 days left and May 31, using 55 days, so day 56 is 1 June (a Thursday, like the first payment). (31 May takes April as 31 days; 18 May is the 4th payment.)