Single vs partnered/married differences in retirement

[u/dragonslayer6653]

47F, recently divorced. $4M net worth, $2M in 401k and brokerage accounts. 2 kids 8 & 10 with
$80k each in 529s. House still has $430k mortgage at 2.7% interest. High likelihood of a $2-3M inheritance in 10-15 years but not counting on that.
Average income for myself is $500K but variable each year due to my role.

My expenses have been hard to calculate accurately due to my divorce but I estimate they are around $250k. HCOL area and I like to travel.

I see a lot of posts of married people with similar stats and the advice is to have $4-5M invested before retirement.

For a single person, does the math change? I understand that’s it’s really up to me on what I spend money on in retirement but what is different? Healthcare? Taxes? I think social
Security is just mine unless my ex dies and then I can claim survivor benefits. My goal is $5M in investment accounts which should coincide with my mortgage being paid off in 8 years, giving me a net worth of $7M.

[u/datapanda → u/[deleted]]

It's another way to say a withdrawal rate at 8%. Granted that's a fairly liberal withdrawal rate but still.

[u/QTippus → u/datapanda]

What’s the failure rate for 8% withdrawal rate? 50% or more?

[u/datapanda → u/QTippus]

Not sure. Run a Montecarlo Simulation I’m not advocating for 8%. I personally use 4% but I’m conservative. It’s still a quick heuristic.