Interest only years Repayments are only the interest for these years, then principal and interest. (optional) Repayments are only the interest for these years, then principal and interest.
Offset balance Held for the whole loan. Interest is charged on the loan less this. (optional) Held for the whole loan. Interest is charged on the loan less this.
Extra with each repayment Paid once principal and interest start. (optional) Paid once principal and interest start.