for those who are not aware by what i meant by the month you start after fra matters , a little gotcha is this :
when you get delayed credits from fra to 70 , each month you delay you earn more and more .
however if you file mid year you get those credits in january of the following year but only going forward not retro too . .
your rate they pay you when you start mid year is the rate without all the delayed credits you earned that year . you won't see those calculated until january .
so in january they increase you but never pay you retro for the months the year before you earned the credits but did not get them .
it is always best to file in january so you capture all delayed credits earned and not just going forward .
ss tells you this in a paragraph but really does not explain what it means to you nor do most employees at ss have a clue .
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"Delayed retirement credit is generally given for retirement after the normal retirement age. To receive full credit, you must be insured at your normal retirement age. No credit is given after age 69.
If you retire before age 70, some of your delayed retirement credits will not be applied until the January after you start benefits. The calculator below gives you the amount with all credits applied for comparison purposes."
https://www.ssa.gov/oact/quickcalc/early_late.html