This procedure calculates the APR of a loan when fees are charged (either as a percentage of the loan amount or a flat rate) and a balloon payment is due at some time during the term of the loan. Remember to use the cash flow sign convention (money received is positive, money paid out is negative).

Set End mode (press g, then END) and clear the financial registers (press f, then FIN).

Calculate the periodic payment amount of the loan.

Key in the total number of payment periods and press n.

Key in the periodic interest rate and press i.

Key in the mortgage amount and press PV.

Press PMT to calculate the periodic payment amount.


Calculate the amount of the balloon payment.

Key in the number of the payment period where the balloon payment occurs and press n.

Press FV to calculate the balloon payment amount.


Calculate the actual net amount disbursed.

If the fees are stated as a percentage of the mortgage amount (points), recall the mortgage amount (press RCL, then PV); key in the fee percentage rate; press the percent key %, the minus key [], then PV.

If the fees are stated as a flat charge, recall the mortgage amount (press RCL, then PV); key in the fee amount (flat charge); press the minus key [], then PV

If the fees are stated as a percentage of the mortgage amount plus a flat charge, recall the mortgage amount (press RCL, then PV); key in the fee percentage rate; press the percent key %, then press the minus []; key in the fee amount (flat charge); press the minus key [], then PV


Press i to calculate the percentage rate per compounding period.

To calculate the annual nominal percentage rate, key in the number of periods per year and press x