Overview of Why I’m Baking Lifestyle Inflation Into my Coast FI Plan
This episode of BiggerPockets Money explores why planned lifestyle inflation can be a smart part of a Coast FI strategy instead of something to fear. Scott Trench and Evan Lawler discuss how spending naturally tends to rise over time, why early-career frugality often won’t last forever, and how using real spending data can make a financial independence plan more realistic, flexible, and psychologically sustainable.
Key Discussion Points
Lifestyle inflation is predictable, not a failure
- Evan, age 25, is currently extremely frugal and spending roughly $2,600–$3,000 per month.
- He does not expect to live at that level forever and is deliberately building future spending increases into his plan.
- The core idea: spending more later in life does not automatically derail FI if it’s anticipated and modeled correctly.
Data shows spending usually rises with age and household size
- Scott walks Evan through spending benchmarks for the greater Philadelphia area using age and household-type data.
- For a single person age 25–34, bottom-quintile spending is around $2,500/month, which matches Evan’s current spending.
- For a couple with kids age 35–44, median spending jumps dramatically, especially with childcare:
- Roughly $7,200/month in the median case
- Even higher when daycare is included
- The point: a spending pattern that feels “minimalist” at 25 may be unrealistic for a family in their 30s.
Coast FI gives room for flexibility
- Evan’s Coast FI target:
- $500,000 by age 30
- Growing at an assumed 7% real return
- Reaching about $5 million by age 65
- Supporting roughly $200,000/year in retirement income using the 4% rule
- The Coast FI approach allows him to save aggressively now while leaving room for later-life spending increases.
The FI community has evolved
- Scott reflects that a decade ago, being ultra-frugal was often treated almost like a badge of honor in the FI world.
- Today, the conversation is more balanced: save aggressively, but don’t ignore quality of life.
- Evan and Scott agree that the goal should not be to die with the smallest possible spending number, but to build a life that works across changing circumstances.
Main Takeaways
1. Don’t assume your current spending will last forever
- A hyper-frugal 20-something budget is not a reliable assumption for a 30s or 40s household.
- Marriage, children, housing, transportation, travel, and experiences all tend to push spending upward.
2. Plan for lifestyle inflation intentionally
- Lifestyle inflation should be managed, not denied.
- It’s healthier to assume your budget will rise gradually than to pretend you’ll stay at your current level indefinitely.
3. Use data to calibrate your FI plan
- Scott’s data helps ground planning assumptions in reality rather than optimism or ideology.
- Knowing how households like yours typically spend can help you:
- set more realistic FI targets
- avoid underestimating future costs
- identify where spending may be out of line
4. Coast FI can reduce pressure in high-expense life stages
- For many people, the years when they have kids and high fixed expenses are the hardest financially.
- A Coast FI approach can create more breathing room during those years, even if it means a later retirement date.
5. Not all spending categories should rise equally
- Evan expects some categories, like transportation, to stay relatively reasonable.
- Other categories—like travel, concerts, family experiences, and Disney-related spending—are more likely to grow.
Notable Insights
- “Lifestyle inflation is not necessarily a bad thing. It’s just something that you need to manage and potentially plan for.”
- “It’s too big of a bet to assume you’ll spend in the bottom quintile your entire adult life.”
- The biggest uncertainty in FI planning may not be investment returns—it may be future spending behavior.
- The episode argues that flexibility is a feature, not a flaw, in a realistic FI plan.
Resources Mentioned
- Scott’s free budget tool: biggerpocketsmoney.com/budget
- Healthcare cost tool: biggerpocketsmoney.com/healthcare-costs
- FI-friendly financial pros list: biggerpocketsmoney.com/FIPro
Bottom Line
This episode makes the case that future lifestyle inflation should be baked into FIRE planning, especially for people pursuing Coast FI. Rather than trying to freeze your spending at your 20s level forever, the smarter move is to plan for realistic growth, use data to guide assumptions, and preserve flexibility as life gets more expensive.