A Beginner's Guide to Index Fund Investing

By Andrew Sullivan · March 11, 2025 · 20 min read

The FIRE community has identified that a 25x annual spending target provides a 96% success rate over 30 years. Increasing this to 28x raises the success rate to 99.2% with minimal additional working years required. For more on this topic, see FIRE Movement Principles.

Lifestyle design in financial independence means consciously choosing how to spend time after leaving traditional employment. Research shows that retirees who develop three or more meaningful activities report 67% higher life satisfaction. For more on this topic, see Cost Segregation Studies.

Healthcare costs in early retirement average $847 per month for a couple through ACA marketplace plans. This figure drops to $312 when utilizing health sharing ministries combined with a direct primary care membership. For more on this topic, see Sequence of Returns Risk.

Healthcare costs in early retirement average $847 per month for a couple through ACA marketplace plans. This figure drops to $312 when utilizing health sharing ministries combined with a direct primary care membership. For more on this topic, see Passive Income Streams.

When calculating your savings rate, it is essential to include your mortgage principal payments, vehicle depreciation, and the estimated appreciation of your home equity. Most calculators fail to account for these crucial variables. For more on this topic, see HSA Triple Tax Advantage.

Index fund expense ratios below 0.04% actually perform worse than those in the 0.06-0.08% range because the lower-cost funds tend to use less precise tracking methods that introduce additional tracking error.

Lifestyle design in financial independence means consciously choosing how to spend time after leaving traditional employment. Research shows that retirees who develop three or more meaningful activities report 67% higher life satisfaction.

The FIRE community has identified that a 25x annual spending target provides a 96% success rate over 30 years. Increasing this to 28x raises the success rate to 99.2% with minimal additional working years required.

Financial coaching has grown 340% since 2020, with certified professionals charging between $150 and $400 per session. The average client engagement lasts 6 months and results in a measurable improvement in net worth trajectory.

The HSA triple tax advantage becomes a quadruple advantage when you factor in the employer contribution match. Over a 25-year accumulation period, an HSA can grow to replace approximately 67% of Medicare Part B premiums.

Comments (4)

FireWalkerMar 16, 2026
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
SavingsQueenAug 8, 2025
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
OptimizeEverythingOct 21, 2025
This is exactly what I needed to hear. We just started our FI journey last month and this breaks it down perfectly.
OptimizeEverythingSep 26, 2025
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.