You could read the entire study they did if you feel like it, and income streams that are "virtually guaranteed" should (imo) absolutely be included. So a retiree would include them and any reasonable plan would include them if anywhere near the age to utilize them. There's no good reason I can see for not including them beyond the "SS won't be around!" hype that's been going on for 50 years now, without SS going anywhere. You can decide what is "within" your means by any measure you'd like. I'm going to define it as "spending no more money than comes in", and that would include all sources of income, whether from a job, investments, interest, rental properties, pensions, annuities, SS, medicare benefits, etc. Most people don't tend to discount sources of income arbitrarily, but you're welcome to.
Agreed. My SS dollars will be just as useful as my cash and investments when the time comes. I've paid into SS all through my entire career including to this day, so it's not welfare as the previous poster mistakenly stated anymore than a government pension is welfare.
I decided to vote myself as mustachian because my barebones budget is about $1250/mo., despite a six figure income, which results in a savings rate over 80% and $15,000/yr for spending. I don't think I've spent over $20,000 in a year since 2009. I don't bike everywhere in this climate, but I do bike quite a bit in the warmer months, and I have a short commute to work and very low mileage on my 11 1/2 year old car. And while my house isn't the cheapest I could find, it's lower cost than most mentioned here due to the low cost of living area I live in, and it's been paid-for going on 14 years. And I had been living the same frugal lifestyle for decades, well before I ever heard of MMM or ever went to other early retirement websites.