home hunters in japan will get an indication thursday about how much more they will have to pay for a popular fixedrate mortgage after the bank of japan surprised markets this week by doubling its yield cap on the 10year government bond japan housing finance agency a governmentbacked homeloan financier is set to decide the coupon on a residential mortgagebacked security that will give some insight of how much more interest homebuyers will have to pay in 2023 the cheapest rate on the agency’s popular 35year fixedrate mortgage which backs the rmbs had already climbed to 165 earlier this month the highest since 2014 as the boj came under pressure to adjust its monetary policy following an unprecedented streak of rate hikes by the us federal reserve