T5013 for BIP.UN has Box 151 but TT has two possible entries for the amount i.e before and after June 25. There are also Boxes 270 and 271 which divides that amount. Help

 The new capital gains rate is not going into effect this year, so both periods are taxed at the same one-half (50%) rate. So, you can just use the boxes for "Amount before June 25, 2024".

Thanks but curious for next year if the law goes through. So, I should add the amounts in Box 270 and 271 then enter that total in Box 270? Why is there not two Box 151 on my T5013?  TT has two separate entries for Box 151 (before and after June 24). Thanks in advance.

Box 151 is the total of both periods.

The current government has canceled the new rate entirely, so the t-slips & forms will likely just go back to the way they were for 2023.