Project how your spending changes in financial independence

Some expenses disappear at FI (commuting, work clothes), others rise dramatically (healthcare, time-enabled spending) — model both.

Why it works

Applying a simple multiplier to current spending ignores the structural shift that financial independence produces in your budget. Work-related costs fall significantly; healthcare costs rise (especially pre-Medicare in the US); and discretionary spending often rises because you now have the time to spend on travel, hobbies, and relationships. Failing to model both directions produces a FI number that is too low on the lifestyle side and too optimistic on the cost-reduction side.

How to do it

1. List all work-related expenses (commuting, professional clothing, work lunches, childcare driven by work schedule) and subtract them.
2. Add estimated healthcare premiums for your years before Medicare eligibility.
3. Estimate discretionary increases: what will you spend money on when you have 40 more hours per week?
4. Recalculate the FI number on the projected retirement budget, not the current budget.

Evidence

Healthcare cost modeling is critical for early retirees in the US — premiums and out-of-pocket costs for pre-Medicare coverage have been documented as a primary failure mode in early retirement planning. The general principle (retirement spending ≠ working spending) is mechanistic. (mechanistic)

Healthcare cost projections are highly variable and policy-dependent; any specific number used in planning should be stress-tested against best and worst case scenarios.

Common mistake

Assuming retirement spending will be 80% of current spending as a rule of thumb — this is a retirement-industry heuristic that does not account for early retirement or actual lifestyle preferences.