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An important first step is to determine the amount necessary to cover basic living expenses each year. There are different perspectives on how much this will be.  Some experts believe you should simply calculate your current expenses. Then, expect you'll need about the same amount to live on once you retire. From this perspective, the amount you need each year will be about the same as you need now. Others believe that many retired people can live on about 65 percent of their working income. This assumes that you have paid off your house and you aren't expecting to retire in luxury. Whichever approach you opt for, you'll need to add up all the routine necessities of living. This should include:  Any housing costs you expect to have after retirement Average monthly utilities (e.g. water, electricity, gas, etc.) Food and clothing Transportation Insurance Any other monthly bill you still expect to pay after retiring (e.g. cable or internet)   Here's an example. Let's say Bill and Sally have already paid off their mortgage, but they pay $500 a month in property taxes, homeowner's insurance, and maintenance costs. Their average monthly utilities come to $300. They also spend $350 a month on food and clothing. Their costs for transportation come in the form of auto insurance, gas, and routine maintenance. This totals about $400 a month. Their health insurance is another $800 a month. Their cable and internet is another $150 a month.  All together, their monthly cost for basic living expenses is $2,500. Annually, that's $30,000. This only covers the most basic expenses. Many people have plans to pursue new interests or hobbies during retirement. Many parents have continuing financial responsibilities for disabled children. Others have health problems that will add expenses. You should include these future costs in your projected retirement income need. Add the extra costs that you might face during retirement to your base retirement need. Here are some examples:  Andy and Mary recognize that, due to family history, one or the other is likely to need long-term nursing care. As a consequence, they intend to fund an extra $1000 per month during retirement into savings for those costs. This decision will add $12,000 per year to their projected base living expense. Bill likes to restore American automobiles manufactured before 1960. He anticipates that his travel, tools, and expenses will run $2000 per month. This will add $24,000 to his projected base living expense. Sally likes to take her grandchildren to a major theme park for a weekend every year. The total cost is $720, which will need to be added to the base expenses figure. This may not seem like much, but if she doesn't budget for it, she might not be able to do take them next year. Many retirees want to see the world in their free time. If this is something important to you, you'll need to add this to your monthly cost estimates as well.  For example, imagine your basic expenses are $48,000 per year. If you wish to travel at a cost of $12,000 annually, your total retirement income need will be $60,000. Be as specific in your estimates as you can. If you and your spouse intend to travel, what is the likely annual cost? Are you more likely to spend $50 a day in out of pocket expenses or $200 a day? Will you travel 30 days a year or 180 days? Will your normal living costs at your home base decline if you are traveling? If so, by how much? Consider this example:  Jean and Ed figured that they could live comfortably in their motor-home for $100 per day. This included fuel, upkeep, food, and other travel expenses. They expect to travel during coldest days of the year when snow is on the ground, or about 120 days per year. While they are traveling away from home, their base expenses will decline 15%. The estimated costs of their travel will be $12,000 annually. This will be slightly offset by at-home savings of $350 per month for the three months they are traveling, or $1150. The net costs of their travel will be an addition of $10,850 to their base budget. Bill and Sally want to take a trip to visit their children on the east coast every year. Their plane tickets are about $1,200 dollars. They can stay with their kids, so they only spend about $50 a day during week-long trip. That comes to $1,550. This figure would be added to their base budget. Inflation will reduce the value of the money you save.  You must consider this in your calculations.  Imagine you've estimated that you'll need $60,000 a year for retirement. If you're not retiring for another 15 years or so, then $60,000 won't be enough. You can calculate how much more money you'll need in 15 years by multiplying your annual need by one plus the rate of inflation, raised to the fifteenth power. If we assume a conservative projection of 3.5 percent per year (actual historic rate of inflation is 3.22%), that means in our example you'd multiply 60,000 by 1.035 (103.5%) raised to the 15th power. Many online retirement calculators will compensate for inflation. Using one of these tools is strongly recommended. You can also calculate how much you will need in an Excel spreadsheet. The formula is POWER((1+expected percent of inflation), number of years into the future)*today’s retirement income goal. In our example, the formula in the cell of the spread sheet would appear as POWER(1.035,15)*60000. You will need $100,521 in income fifteen years in the future to have the purchasing power of $60,000 today. In the last 100 years, the United States economy has experienced 13 years of deflation and 87 years of inflation. Excluding 2009, every year since 1990 has experienced inflation ranging from 5.4% to 1.5%.  While inflation is likely in the future, its volatility is impossible to predict. Most experts predict an average inflation rate between 2% and 3%. The higher the actual inflation, the more income needed to equal the purchasing power of today. Any sums that must be available after your death reduces the amount available to you during your life. This includes any money you wish to leave to a surviving spouse or heirs.  Determine how much money you'd like to leave to each person you want to leave something for. To make sure your wishes in this area are carried out, consider drawing up a will so that your money is distributed the way that you want it to be. For example, Bill and Sally want to set aside $2000 for funeral expenses, and leave another $2,000 to each of their children. That makes $6,000 they need to budget for these purposes. How much you need to retire will hinge on how long you will be retired for. This means you'll need to estimate how long you expect to live.  The Social Security administration provides averages for men and women retiring at different ages. Consulting this table is a good place to start.  Take into account your health and family history. Do people in your family tend to live into their late 90s? If so, your prediction should probably be in that range, above the average life-expectancy. On the other hand, if people in your family tend to die young, or if you have already experienced a lot of serious health problems, a lower estimate might be more realistic. Calculating how much money you must accumulate to provide a certain income at retirement. You may use an online retirement calculator or a spreadsheet.  Convert the annual retirement income need into a lump sum. Your retirement income also needs to keep pace with inflation. Suppose you you need $100,521 in income starting at retirement as calculated above, that this income needs to grow at the rate of inflation about 3.5% per annum, for 30 years in retirement. Let's also assume your discount rate is 8% (rate of rate on investing your money). You can use the present value growing annuity formula to convert this to a lump sum: A/(r-g)*(1-((1+g)/(1+r))^n), where A=annual payment (income), r=discount rate, g=growth rate (inflation rate), n=number of years (how many years you expect to live in retirement). Plugging the values into the formula yields $100,521/(8%-3.5%)*(1-((1+3.5%)/(1+8%))^30) = $1,610,722. This is the amount of money you would need in 15 years to provide the retirement income you need to have the same purchasing power of $60,000 income today. Add any post-mortem obligations you wish to fund. Bill and Sally wanted to set aside $6000 for their funeral and their children. Adding this to their retirement need, they would need $1,616,722 to retire. Alternatively, you could use a spreadsheet. Doing this on your own can be complicated. If you want to use an online calculator, skip this and the step on calculating accumulations. Create columns for the annual expenses addressed in the previous steps: basic living expenses, extras, and travel. Fill in the amounts you calculated. Adjust for inflation. If you haven't already done so, adjust these amounts for inflation, as directed above. This is the amount you will need for a single year. Repeat this process in an additional row for each year you expect to be retired. You'll note that the amount will grow every year as a result of inflation. When you've reached the bottom, calculate a subtotal for annual expenses. Add any post-mortem obligations you wish to fund. This final amount is your total amount needed for retirement. If this is all a bit too complicated, there are free Excel templates you can download that are already set up for you. Once you know how much you'll need, your next step is to consider how much you are likely to accumulate before retirement. There are number of factors to think about, such as:  The age which you expect to retire. The time between now and your expected retirement age is the period of asset accumulation for retirement. This is how long you have to save up. The frequency and amount of savings additions. How much and how often you save directly impacts the ending value of your savings at retirement. The rate of earnings on your investments. Your investment choices during the accumulation phase impacts the final value. Keep in mind that investments can be volatile, especially in the short term. The impact of income taxes. Taxes on your investment earnings reduces your capital grown now. Taxes on distributions after you retire reduces your retirement income. Both will impact your available funds. Like retirement costs, you can calculate your estimated accumulations using an excel spreadsheet. You can do this as follows:  Create columns for your previous savings and annual contributions. Sum your existing retirement savings and anticipated contribution for this year in a third column. You can use the "SUM" feature in excel to calculate this automatically. Create a column that will calculate the amount you expect to earn on your investments annually. You can use the "PRODUCT" function to compute this automatically. For example, if you expect to earn 9 percent on your investments, you would have your spreadsheet calculate the amount in column C times 1.09. If your earnings are taxes annually (e.g. because some of it is coming from stock dividends), you'll need to another column where any taxes are subtracted. As with the expenses spreadsheet, you'll need to add a row for each year between now and retirement so you can see how your money will grow. When you've reached the end of your accumulation period, you should have a figure for your total savings. Last but not least, deduct the amount you will pay in taxes when you withdraw the funds. This amount will vary based what types of investments you have. You'll need to look into the details of your retirement plan and any other investments. Again, if this is too complicated, consider downloading a template that's already set up. You can create a spreadsheet that includes all factors and calculates necessary retirement funds. But, this is time-consuming and complicated. A simpler approach is to use one of the many retirement income calculators free on the internet.  These calculators are available from Bankrate, the AARP, and CNN Money.  They use the same figures described above: expenses, existing savings, and projected accumulations. But, these calculators do all the math for you. When working with calculators, play with the inputs. You'll see the effects of investment amounts, earnings rate, inflation, and life expectancy. This will give you a better sense of how these different factors will impact you.

Summary:
Determine basic living expenses. Calculate extra expenses. Include travel expenses. Recognize the impact of inflation. Consider post-mortem obligations. Predict the length of your retirement. Calculate total retirement funds needed. Consider accumulations. Calculate total accumulations. Use a retirement calculator.