Relative the cut, I r an opensecurity.com assuming the cut and my optimum SS date moved to 68 years old. That included spouse benefits and my wife taking her much smaller at 66
Opensecurity does not calculate what happens with investments. I ran the whole thing in my spread sheet with a 4% ROI 2.5% inflation and the cut. I also assumed a conservative spending amount higher ($10K) than I am spending now to cover more fun stuff. I also have a pension.
70 isn't the better option until age 105
67 becomes the better option at age 89
66 becomes the better option at age 72, it runs very close to 67 though. Not a huge difference
65 is better from start until age 72
These are the options I am considering as all have a growth trend to my total investment portfolio even at 4%. Taking early covers me till mid 90's but has a negative growth trend. Of course these are all projections based on my assumptions. Your assumptions and situation will be different.
Your results will depend on your situation. For me, my Roth conversion will mostly be complete at age 67-68, so taxes will become less. I already have $650K in my Roth. The difference between 66 and 67 is small. Like 100K in my early 90's.
I did not model 64 or 63 (This year) as I already ruled those out. Those put me at a much lower set of assets in my mid 80's. I didn't model 68 as of yet, but will when I get closer.
For me (Yours will be different), I won't take SS earlier than 66 and likely by the time I am 68. Things change with actual Spending, ROI, Taxes and if SS cut gets fixed. This is where I am today, tomorrow will likely be different
For me, I haven't set a line in the sand, just something I monitor.
The other consideration is if one of you passes. My wife did not have a lot of SS earnings so she will depend on my survivor benefit. That at 66 along with everything in a ROTH sets her up nicely should I go first
Everything in life is a balance. If you are looking at taking it early and haven't done the work to see how this impacts you in 20 years, then you are doing yourself a disservice. For some, taking early (62/63) is the right answer based on their unique situation. For me, it is the wrong answer.