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I've learned over the years that when it comes to Social Security retirement benefit calculations, there are three kinds of people. There are those who just want to know what their benefit is going to be and don't really care too much about how it's calculated. Then there are those people who want a general idea of how their benefit will be figured, but they don't need or want to know all the nitty-gritty details. (I think most seniors fall into that category.) And finally, there are more than a few senior citizens out there who want to know exactly how the government comes up with their retirement benefit calculation.

Because I'm going to spend the rest of this column explaining how Social Security retirement benefits are figured, people in that first category can stop reading right now.

For those of you in the second category, here is a relatively simple explanation: In a nutshell, a Social Security retirement benefit is a percentage of your average monthly income using your highest 35 years of inflation-adjusted earnings.

When you file for retirement benefits, the Social Security Administration will look at your earnings history and pull out your highest 35 years. They don't have to be consecutive. If you don't have 35 years of earnings, the SSA must plug in an annual salary of $0 for every year you did not work, until the 35-year base is reached.

However, before they add up those "high 35," they index each year of past earnings for inflation. This is where the formula starts to get messy. That's because there is a different adjustment factor for each year of earnings, AND each year's adjustment factor is different based on your year of birth.

Here is a quick example. If you were born in 1962 and earned $20,000 in 1992, they would multiply those earnings by an inflation adjustment factor of 2.78, meaning they would actually use $55,600 as your 1992 earnings. But if you were born in 1961 and earned that same $20,000 in 1992, they would use an inflation factor of 2.64, resulting in $52,800 as the 1992 earnings used in your Social Security computation.

You can find a complete breakdown of those inflation adjustment factors for each year of birth (for folks nearing retirement age) at the Social Security Administration's website.

The next step in the retirement computation formula is to add up your highest 35 years of inflation-adjusted earnings. Then you divide by 420 -- that's the number of months in 35 years -- to get your average inflation-adjusted monthly income.

The final step brings us to the "social" part of Social Security. The percentage of your average monthly income that comes back to you in the form of a Social Security benefit depends on your income. In a nutshell, the lower your average wage, the higher percentage rate of return you get. Once again, the actual formula is messy and varies depending on your year of birth. As an example, here is the formula for someone born in 1962: You take the first $1,174 of average monthly income and multiply it by 90%. You take the next $5,904 of your average monthly income and multiply that by 32%. And you take any remainder and multiply it by 15%.

You can find a complete breakdown of those computation "bend points" at www.socialsecurity.gov.

Believe it or not, that was the simple explanation. If it were a college course, it would be Social Security Benefit Computation 101. But now I'm going to offer the slightly more advanced course for those who want to know every detail of the benefit computation formula.

I'll start by introducing this term: the "primary insurance amount," or PIA. The PIA is your basic retirement benefit upon which all future calculations will be based. The "raw PIA" is actually calculated at age 62. In other words, when the SSA pulls out your highest 35 years of earnings, they only use earnings up to age 62. Then that raw PIA gets "cooked," or increased, to take into account any earnings you had after age 62 and to include any cost-of-living adjustments (COLAs) that were authorized for Social Security benefits after the year you reached age 62.

But it gets a little tricky when SSA does the recomputation for any earnings you have after age 62. If you worked full time until age 67, for example, you would normally assume that those earnings between age 62 and 67 would increase your PIA. After all, you figure, they are some of your highest-earning years, so they will become part of that "high 35."

But not necessarily. For reasons I can't take the time to explain in this short column, earnings after age 60 are not indexed for inflation. They get calculated at current dollar value only. So, if your "raw PIA" was based on a full 35-year history of high inflation-adjusted earnings, your current earnings may not be high enough to become part of your "high 35," in which case they won't increase your benefit. Or they might bump up the PIA, but not by much.

In fact, I hear from readers all the time who tell me that they are confused because the benefit estimate they are getting from the SSA now (at age 67, let's say) is not much more than the estimate they got back at age 62. Their current benefit estimate includes the COLA increases, but either little or no bump for their post-62 earnings. The reason why is that lack of inflation indexing after age 60.

As you can see, the Social Security retirement benefit formula is pretty messy. And for most of you, I'd say, don't worry about it. Just let the SSA do it for you. Go to www.socialsecurity.gov, and click on the "Plan for retirement" link on the homepage. It will walk you through the process of finding out what your Social Security benefit will be.

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If you have a Social Security question, Tom Margenau has two books with all the answers. One is called "Social Security -- Simple and Smart: 10 Easy-to-Understand Fact Sheets That Will Answer All Your Questions About Social Security." The other is "Social Security: 100 Myths and 100 Facts." You can find the books at Amazon.com or other book outlets. Or you can send him an email at thomas.margenau@comcast.net. To find out more about Tom Margenau and to read past columns and see features from other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com.

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