The other spouse also elects & suspends own benefit, then applies for the spousal benefit, which is 50% of the highest benefit spouse
Gonna get really technical here, but, in fact, the other spouse files ONLY as a spouse and does not require filing/suspending under his/her own benefit. Only the non-collecting spouse files and suspends. You can't file for your own, suspend, then collect as a spouse.
1. Spouse a files, suspends. Collects nothing.
2. Spouse b files as spouse of a. Collects 50% of a's benefit.
3. Spouse a unsuspends at age 70 to max delayed retirement credits (drc)
4. Spouse b filed under own record at 70, converting from spousal benefit to own retirement benefit with max drc.
Since my wife's SS benefit on her own record should be slightly higher than spousal @ FRA, but slightly lower @ 70, my plan was (@ Full Retirement Age/67)
Wife files under her own benefits @ FRA. I file as a spouse.
Collect until age 70.
Swap.
Percents used below are percent of my benefit @ FRA/age 67. For simplicity, COLA is ignored.
So, from 67 to 70, we collect her benefit (lets say, 60% of mine @ 67) and I collect half of that as a spousal benefit, for a total of 90% of what my solo benefit would be.
Fast forward 3 years compounded @ 8% per year, I start collecting at 126%, and she collects a spousal benefit of 63%, for a total of 189%
Note: My understanding is that this only works @ FRA, under current rules. Try it earlier than FRA, and I would be "deemed" to be filing for my own benefit at the same time and we would both have permanently reduced benefits.
The Social Security system is VERY complex with lots of gotchas. SS employees don't even know how it works most of the time.