Let's Say you retire this year at age 62 with the $1 Million Portfolio and decide to take a 4% SWR. You get Social Security of $19,476 per year at age 62 and delaying to age 70 would get you $34,092 per year. Let's assume no inflation for ease of calculations.
Scenario age 62. Your SWR is $40K per year and Social Security of $19,476 gets you a Spending total of $59,476 for each year of your retirement period.
Scenario age 70. You stash 8 years of $34,092 from your portfolio into a savings account for a total of $272,736. Your portfolio is now down to $727,264. Your 4% SWR is now $29,090 per year and you remove $34,092 from your savings account giving you a total of $63,182 to spend each year for the rest of your 30 year retirement period.
The Delay to age 70 gives you $3,706 more every year starting at age 62 with no more increased risk.
No need for any ... 'break even analysis'.
If your WR is more conservative, such as a majority of the people here and myself, the results are even more compelling. At a 3% WR plus SS at age 62 scenario is a total of $49,476 and the age 70 scenario is $55,910. The delay of SS to age 70 now increases your annual spending by $6,434.