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Am I Understanding Compounding Interest Correctly?

Posted on 5/12/15 at 11:10 am
Posted by StringedInstruments
Member since Oct 2013
18399 posts
Posted on 5/12/15 at 11:10 am
Opened a Roth IRA with a VFINX fund last October. Started with $3200. Been putting about $50 in each month and have upped it to $100.

I used a calculator that said in thirty years, if I keep up the $100/month payments, my VFINX could be worth about $175k.

Is this really a safe bet? Am I using the right calculator to figure this out?

My wife and I are trying to figure out what we have in retirement so far and what we can expect in the future before making a career change.
This post was edited on 5/12/15 at 11:10 am
Posted by Shepherd88
Member since Dec 2013
4584 posts
Posted on 5/12/15 at 11:14 am to
thats assuming just north of 8% return average which is pushing it. It certainly could happen but for the sake of projections it's better to estimate a more conservative return of 6%.
Posted by KosmoCramer
Member since Dec 2007
76519 posts
Posted on 5/12/15 at 11:22 am to
Make sure you account for the value of money in 30 years.
Posted by NoSaint
Member since Jun 2011
11281 posts
Posted on 5/12/15 at 11:35 am to
quote:

My wife and I are trying to figure out what we have in retirement so far and what we can expect in the future before making a career change.


while important, retirement is a looooooong way off. consider it, but the variables between now and 3 decades from now are such that id consider it in very broad sense when considering career changes.
Posted by Sigma
Fairhope, AL
Member since Dec 2005
3643 posts
Posted on 5/12/15 at 12:45 pm to
quote:

Make sure you account for the value of money in 30 years.


This. It's helpful to set savings goals by determining the expected return (6-8% as above) then subtracting inflation. So for retirement calculations I always use 4%, that way I can think in terms of today's dollars.

And about your $100...you will increase that with time, I'm sure, just from wage growth, promotions, etc. Calculators that allow you to index your deposits are out there.
Posted by Patrick_Bateman
Member since Jan 2012
17823 posts
Posted on 5/12/15 at 9:20 pm to
Those who understand interest earn it. Those who don't pay it.

I read that today.
Posted by HailToTheChiz
Back in Auburn
Member since Aug 2010
48945 posts
Posted on 5/12/15 at 9:29 pm to
Thanks Patrick
Posted by sonoma8
Member since Oct 2006
7666 posts
Posted on 5/13/15 at 8:26 am to
stupid question but does a 401k compound interest as well?
This post was edited on 5/13/15 at 8:30 am
Posted by Volvagia
Fort Worth
Member since Mar 2006
51907 posts
Posted on 5/13/15 at 10:06 am to
Any account that earns a return that is reinvested experiences compound interest.
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