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How does Inflation affect my Retirement?

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THE SCENARIO I recently got a letter from the company that manages the 401(k) accounts at the place I used to work. They said that if their projections are correct, then when I retire (in 23 years), my account should provide $48,000 per year in income (amounts have been changed to protect the innocent). Wow, $4,000 per month to live on! Sounds great! (Actually, it sounds a little thin to me if that's all the income I have, but we'll go with it for now.) However, I've heard of inflation, so what I want to know is 'How much buying power, in today's dollars, will that $4,000 per month have in 23 years?' To keep things simple, I'll use monthly compounding, and an inflation rate of 3.7%. (This is about what the average annual inflation rate has been in the United States for the past 40 years.) If you don't like my 3.7% number, feel free to use one you think better matches reality, or that better predicts the future. I got my figure here. Keep in mind that if you decide to use a different inflation figure, your answer will turn out different than mine.
THE SOLUTION First things first, make sure the calculator is using 12 Payments per Year. 23 years is 23 x 12 months, which is 276 months. N: 276 I/YR: 3.7 PV: (this is what I'm trying to find) PMT: 0 FV: 4000 When I plug in the numbers, I find that my monthly stipend beginning in 23 years has the same buying power as $1,710.19 today. If I was questioning my living comfort after retirement on $4,000 per month, I'm seriously questioning it at less than half of that figure. You may wonder 'why does the calculator return a negative number for PV?' (The calculator says that PV is -1,710.19.) The answer is that another way to consider this scenario is to ask yourself the question 'How much would I have to invest today at 3.7% to get me $4,000 in 23 years?' Since I'm going to get $4,000 in the future, I need to invest (i.e. pay out) some money today, so PV is represented as a negative number.