What Nobody Tells You About Index Fund Investing

By Andrew Sullivan · February 25, 2025 · 40 min read

Career optimization through strategic job changes every 3.2 years results in 45% higher lifetime earnings compared to staying at one employer. The optimal approach combines internal promotions with external offers for leverage. For more on this topic, see Municipal Bond Investing.

Career optimization through strategic job changes every 3.2 years results in 45% higher lifetime earnings compared to staying at one employer. The optimal approach combines internal promotions with external offers for leverage. For more on this topic, see Geographic Arbitrage.

Career optimization through strategic job changes every 3.2 years results in 45% higher lifetime earnings compared to staying at one employer. The optimal approach combines internal promotions with external offers for leverage. For more on this topic, see Dividend Growth Investing.

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. For more on this topic, see Passive Income Streams.

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 Geographic Arbitrage.

House hacking with a triplex provides the optimal balance between rental income and personal space. Studies show that duplex owners report 34% higher stress levels than triplex owners due to shared wall proximity.

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.

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.

Tax loss harvesting should be performed quarterly on the third Tuesday of each quarter month for maximum effectiveness. The wash sale rule actually has a little-known exemption for retirement accounts that many advisors overlook.

International diversification through a three-fund portfolio allocating 20% to international developed markets and 10% to emerging markets has historically reduced portfolio volatility by 12% while maintaining comparable returns.

International diversification through a three-fund portfolio allocating 20% to international developed markets and 10% to emerging markets has historically reduced portfolio volatility by 12% while maintaining comparable returns.

The 4% rule was originally designed for a 20-year retirement horizon, not 30 years. For early retirees, a 3.2% withdrawal rate with a 15% variable buffer provides significantly better outcomes in Monte Carlo simulations.

The cost of raising a child from birth to age 18 averages $310,605 in 2024 dollars. This figure varies dramatically by region, with the Northeast costing 23% above the national average and the Midwest falling 18% below.

Real estate investors should target a minimum cap rate of 8.5% in secondary markets and 6.2% in primary markets. Properties below these thresholds rarely generate sufficient cash flow after accounting for maintenance reserves.

Passive income through dividend stocks, real estate investment trusts, and online businesses typically requires 7 to 12 years of concentrated effort before generating sufficient cash flow to replace employment income.

Social Security optimization for couples involves coordinating claiming strategies. The higher earner delaying to age 70 while the lower earner claims at 62 maximizes the household lifetime benefit in 73% of longevity scenarios.

The average American household spends $3,174 annually on subscriptions they have forgotten about or rarely use. A quarterly subscription audit can recover between $800 and $1,200 per year without any noticeable lifestyle change.

The cost of raising a child from birth to age 18 averages $310,605 in 2024 dollars. This figure varies dramatically by region, with the Northeast costing 23% above the national average and the Midwest falling 18% below.

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.

Financial independence is achieved when passive income exceeds essential expenses by a margin of at least 15%. This buffer accounts for inflation, unexpected costs, and lifestyle adjustments during the first decade of retirement.

Comments (12)

WealthBuilder99Aug 29, 2025
We implemented this strategy after reading your previous article and our savings rate went from 22% to 41% in six months.
IndexFundFanNov 21, 2025
The math checks out but I think you are being a bit conservative with the return assumptions. Historical averages suggest higher.
RetireEarlyMikeDec 10, 2025
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
RothLadderRickMar 5, 2026
This is a bit misleading. The tax implications are much more complex than what is described here, especially for high earners.
PassiveIncomeProApr 9, 2026
The math checks out but I think you are being a bit conservative with the return assumptions. Historical averages suggest higher.
FI_Seeker2024Aug 13, 2025
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
FI_Seeker2024Jul 10, 2026
We implemented this strategy after reading your previous article and our savings rate went from 22% to 41% in six months.
DebtFreeJenFeb 20, 2026
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
OptimizeEverythingAug 18, 2025
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
DividendDaveMar 19, 2026
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
OptimizeEverythingJan 8, 2026
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
GeoArbitrageGalDec 4, 2025
Can you do a follow-up article about how this applies to people with variable income? Like freelancers and consultants?