Compute Loan Balance for a specific month (period) on an amortized loan
I'm looking for is a method that will allow me to compute the Loan Balance value for a specific period (month) in the amortization table without having to compute all of the values before it.
Let's say: your bank loan of 100000$ at the rate of 10% with annual rate compounded monthly and for a maturity of a 10 years.
So we have following information:
PV = 100000$,
Time (or n) = 10,
Frequency (#) = 12 (monthly),
Rate (r) = 10% or 0.1.
We should find 66th month Loan Balance value without establishing whole table. Please do not suggest to calculate with Future Value (FV of annuity) formula replacing Time (n) = by 66 (month that we want to find value)
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Given
PV = principal
i = periodic rate
m = number of periods
d = periodic payment
d = PV i (1 + 1/((1 + i)^m - 1))
the balance b remaining in month x is
b = (d + (1 + i)^x (i PV - d))/i
Applying your figures
PV = 100000
i = 0.1/12
m = 10*12
? d = 1321.51
x = 66
? b = 57276.53
Check: final balance
x = 120
? b = 0
Formulae
Formula for periodic payment - loan payment formula
Formula for loan balance - inhomogeneous difference equation (Arne Jensen, Aalborg Uni.)
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