Talk:Present value interest factor

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

PVA_i,n = R (PVIFA_i,n)

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

The formula to find PVIFA_i,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)