A modest decline in FHA endorsements of jumbo loans in the fourth quarter of 2012 could presage further declines this year, following the Department of Housing and Urban Development’s recent proposal to raise the downpayment requirement to 5 percent, from 3.5 percent, for loans above $625,500. The FHA already has raised its jumbo mortgage insurance premiums to 1.55 percent annually and increased the monthly premiums on new, non-jumbo FHA mortgages by 10 basis points. The agency retained the 3.5 percent downpayment for new forward mortgages below $625,500. The increased premiums are ... [2 charts]