 The calculations for an amortizing loan are those of an annuity using the time value of money formulas and can be done using an amortization calculator.An amortizing loan should be contrasted with a bullet loan, where a large portion of the loan will be paid at the final maturity date instead of being paid down gradually over the loan's life.An accumulated amortization loan represents the amount of amortization expense that has been claimed since the acquisition of the asset.