My budgeting crudely worked as follows:
Current spending: $70k (including ammortized maintenance, car replacement, typical vacations, and other similar items)
Current mortgage spending: $22k (assumed to be paid off for planning purposes)
Net: $48k
Healthcare under ACA for silver plan: $5k (major wild card right now)
Target: $53k post tax money
Calculated taxes: $2-4k depending on state we retire to
Final target: $55k
I expect to spend less in retirement by easily 10% lower, but consider that to be cushion not to be counted on yet. I also will have full SSA benefits 22 years after retirement, and partial spousal benefits in 19 years which in total cover about 85% of our spending past 70. We can be targeting about a 4.5% SWR due to this.
I also expect that we can attack a lot of spending habits in the short term to lower the target, or increase our margin.