It's the same as why you wouldn't measure your weight in ounces, but neither would you weigh something very light in pounds - you want a convenient number which is easy to interpret. PC is short for parsec and it's a unit of measurement equal to 3,000,000,000,000,000,000 cm!
Take your annual covered earnings (the earnings on which you pay Social Security payroll taxes), multiply it by that year's index factor and you will obtain your indexed wage for each year you have worked. Next, add up all these indexed wages and divide them by 35 to determine your average wage.
Why Should I Verify Names and SSNs Online. Correct names and SSNs on W-2 wage reports are the keys to the successful processing of your annual wage report submission. It's faster and easier to use than submitting your requests paper listings or using Social Security's telephone verification option. Results in more accurate wage reports. Saves processing costs and reduces the number of W-2c's. Allows Social Security to give the proper credit to your employees' earnings record, which will be important information in determining their Social Security benefits in the future.