The shorthand way of stating the most usual elements of a residential mortgage payment, which may consist not only of the Principal and Interest (PI) but the property taxes (T) and hazard insurance (I) as well. In the case where all four elements are part of the payment, the lender escrows the T and I and pays them on behalf of the borrower when they come due. Some loans are written such that the payment to the lender consists only of the P and I in which case the borrower pays the taxes and ins