Assuming you don't need the money, another good reason to not take SS benefits early is because they are indexed to inflation. If early 1970s style hyper inflation were ever to rear its ugly head again in the US, and, say, prices of things you needed to buy like food, fuel, medicine, etc, started going up by 10 or 20%/year, your SS benefits would also go up by an equal amount. Based on history, though, your investments would be more likely to tank at the very time you needed extra money. Most failures of the 4% rule happened, not as a result of stock market volatility, as many people assume, but because of a combination of weak stock market returns and high inflation during the period between the mid 1960s and the mid 1970s.
I think you addressed the question I had while reading this thread.
Say my SS statement says I will collect $1,600 at 66yrs old and $2,200 at 70yrs old.
Can I assume if inflation is 3% a year from 66 yrs old to 70 yrs , does my $2,200 increase
with inflation to $2,900, even though I'm not collecting.
ie. Will the number on my SS statement at 70 yrs old increase each year with inflation?
I found the answer to my own question, and now I think duh! of course.
"If you do receive a statement next month, it is important to know how to interpret the benefit projections. They are likely somewhat smaller than the dollar amount you will receive when you actually claim benefits, because they are expressed in today’s dollars - before adjustment for inflation."
“Take someone who is 54 years old today - and her statement says she can expect a $1,500 monthly benefit 13 years from now when she is at her full retirement age of 67,” says William Reichenstein, Meyer’s partner and a professor of investment management at Baylor University.“If inflation runs 2 percent every year between now and then, that’s a cumulative inflation of 30 percent, so her benefit will be $1,950 - but prices will be 30 percent higher, too. "
https://www.reuters.com/article/us-column-miller/how-to-interpret-your-social-security-benefit-statement-idUSKBN0GL14N20140821