The Honolulu City & County Down Payment Loan Program offers a zero-interest loan up to $40,000 amortized over 20 years to assist homebuyers who fall below the 80% Area Median Income or AMI (based on their household size). There is no loan fee and at the end of each year that a borrower makes their payments, an additional year's worth of payments owed are forgiven. At the end of 10 years, half of the loan has been forgiven. More info can be found at Honolulu Gov - Department of Community Services - Housing - Loan
Programs for Homeowner webpage: Honolulu Gov