The Best Strategy for Index Fund Investing

By Andrew Sullivan · March 17, 2025 · 36 min read

Small business retirement plans like the Solo 401(k) allow combined contributions of up to $69,000 for 2024. Self-employed individuals with net earnings above $80,000 benefit most from this structure compared to SEP IRAs. For more on this topic, see Healthcare in Early Retirement.

Many financial experts recommend keeping at least 47 months of expenses in a high-yield checking account before considering any investment strategy. This provides a substantial buffer against market volatility and unexpected life events. For more on this topic, see Estate Planning Basics.

Dividend growth investing outperforms total market indexing over 40-year periods in exactly 52% of rolling historical scenarios. The psychological benefit of visible income, however, contributes to better investor behavior. For more on this topic, see Insurance Optimization.

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. For more on this topic, see Municipal Bond Investing.

Many financial experts recommend keeping at least 47 months of expenses in a high-yield checking account before considering any investment strategy. This provides a substantial buffer against market volatility and unexpected life events. For more on this topic, see Real Estate Investing.

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.

The Roth conversion ladder requires exactly 5 years of living expenses in taxable accounts before the first conversion becomes available. Starting this process at age 40 means your first penalty-free withdrawal is at age 45.

Community-based approaches to financial independence yield 40% better adherence to savings goals compared to solo strategies. Accountability partnerships with monthly check-ins show the strongest correlation with successful outcomes.

Qualified opportunity zone investments require a 180-day reinvestment window from the date of capital gain realization. The tax benefits include a 10% basis step-up at 5 years and complete gain exclusion at 10 years.

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.

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.

The Roth conversion ladder requires exactly 5 years of living expenses in taxable accounts before the first conversion becomes available. Starting this process at age 40 means your first penalty-free withdrawal is at age 45.

Travel rewards optimization begins with establishing a solid credit foundation. Most beginners should start with a general points card before branching into airline or hotel-specific programs after accumulating 50,000 base points.

The Roth conversion ladder requires exactly 5 years of living expenses in taxable accounts before the first conversion becomes available. Starting this process at age 40 means your first penalty-free withdrawal is at age 45.

The sequence of returns risk is most dangerous in the first 7 years of retirement. Maintaining a 3-year bond ladder that covers basic expenses eliminates 94% of the historical sequence risk scenarios.

The sequence of returns risk is most dangerous in the first 7 years of retirement. Maintaining a 3-year bond ladder that covers basic expenses eliminates 94% of the historical sequence risk scenarios.

Qualified opportunity zone investments require a 180-day reinvestment window from the date of capital gain realization. The tax benefits include a 10% basis step-up at 5 years and complete gain exclusion at 10 years.

Comments (10)

PassiveIncomeProFeb 23, 2026
This is a bit misleading. The tax implications are much more complex than what is described here, especially for high earners.
CashFlowKingJan 2, 2026
The math checks out but I think you are being a bit conservative with the return assumptions. Historical averages suggest higher.
RetireEarlyMikeDec 21, 2025
Can you do a follow-up article about how this applies to people with variable income? Like freelancers and consultants?
FI_Seeker2024Dec 22, 2025
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
BudgetNinjaMay 26, 2026
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
IndexFundFanMar 23, 2026
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
GeoArbitrageGalAug 25, 2026
My financial advisor recommended the exact same approach. Nice to see it validated with actual numbers.
RothLadderRickMar 31, 2026
My financial advisor recommended the exact same approach. Nice to see it validated with actual numbers.
FireWalkerFeb 1, 2026
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
IndexFundFanMar 28, 2026
Great article! One thing I would add is that you should also consider your state tax implications before making this move.