Talk:Present value interest factor

PVIFA is used in calculations such as PVA or Present Value of Ordinary Annuity with a formula such as

PVAi,n = R (PVIFAi,n)

where R is the periodic receipt i is the interest rate n is the number of periods

The formula to find PVIFAi,n is $$	\sum_{t=1}^n \frac{1}{\left ( 1+i \right )^{t}} = \frac{1-[\frac{1}{\left ( 1+i \right )^{n}}]}{i}$$

On my site I host tables for FVIF, FVIFA, FVIFAD, PVIF, PVIFA, PVIFAD along with a google gadgets and a MS Windows calculator.

FVIFAD refers to Future Value Interest factor of $1 for Annuity Due PVIFAD refers to Present Value Interest factor of $1 for Annuity Due

Dexteronline (talk) 17:19, 25 December 2009 (UTC)dexteronline

Connection with Geometric progression
The PVIFA formula can be deducted from the Geometric progression sum formula:
 * $$\sum_{k=m}^n r^k=\frac{(r^{n+1}-r^m)}{r-1}$$

Maybe this should be included.

JackStoneS (talk) 16:47, 1 February 2010 (UTC)