ACCELERATED PAYMENT STRATEGIES ------------------------------ The basic idea in developing an improved prepayment ("acceleration") strategy, especially for mortgages, is to consider prepaying unequal extra amounts towards principal. The most common situation is apparently to add the same extra amount in each regular payment, but this is a poor approach. The following example shows why. With no prepayment, a 30-year mortgage for $50,000 at 9% is paid off in 360 monthly installments of $402.31 (total interest, $94,832.07). If an extra $50 were added to every payment, the loan would be paid off in 237 payments at a savings of $37,900 in interest. This simple strategy yields an effective annual percentage rate (APR) of 8.978%. Over the life of the loan, it prepays a total of $11,850 toward the principal. Significantly better results are obtained using a strategy of unequal prepayments. If, instead, an extra $100 were added to the first 60 payments and $35 to the rest, then the mortgage is retired in only 218 payments, and $45,614 is saved in interest. The effective APR drops to 8.635%, a substantial reduction. And the total prepayment against principal is actually a few hundred dollars less! Still better strategies can be developed by gradually tapering the prepayment amount, but this simple example illustrates the general effect. Another critical aspect of developing a sound prepay- ment strategy is taking into account the effect of interest rate changes. This is particularly important to anyone financed with an adjustable rate mortgage (ARM). When, and by how much, the interest is changed will materially affect the performance of any prepayment schedule. Even the best strategy can fall apart because of interest rate fluctuations that weren't taken into account when it was developed. Proper consideration of this issue is a must for anyone thinking of prepaying an ARM.