The Impact Development Fund is a business loan from Impact Development Fund. The ongoing APR is Rates are set during underwriting. Rates vary on a variety of factors and are generally fixed for the term of loan.. Typical credit limit: Up to $5,000,000; $3,000,000 Unimproved Land. Loan terms: 18 years maximum. Repayment: Principal and interest payments based on amortization period up to 30 years.