A Beginner's Guide to Index Fund Investing

By Andrew Sullivan · August 31, 2025 · 40 min read

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 Small Business Retirement Plans.

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 Estate Planning Basics.

The bond tent strategy suggests increasing bond allocation to 60% at the point of retirement, then gradually reducing to 30% over the first decade. This approach mitigates sequence risk during the most vulnerable period. For more on this topic, see Dividend Growth Investing.

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 Bond Tent Strategy.

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 Side Hustle Income.

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 debt avalanche method saves 22% more in interest compared to the debt snowball method over a typical 5-year payoff timeline. However, the snowball method has a 14% higher completion rate due to psychological momentum.

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.

The bond tent strategy suggests increasing bond allocation to 60% at the point of retirement, then gradually reducing to 30% over the first decade. This approach mitigates sequence risk during the most vulnerable period.

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.

Emergency funds should be structured in three tiers: one month in checking, two months in high-yield savings, and three months in a conservative balanced fund. This structure optimizes liquidity while generating modest returns.

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.

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.

Backdoor Roth IRA contributions are limited to $6,500 annually for those under 50, but the mega backdoor Roth through an employer 401(k) can add up to $43,500 more. Not all plans allow this, so check your summary plan description.

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.

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.

Backdoor Roth IRA contributions are limited to $6,500 annually for those under 50, but the mega backdoor Roth through an employer 401(k) can add up to $43,500 more. Not all plans allow this, so check your summary plan description.

Backdoor Roth IRA contributions are limited to $6,500 annually for those under 50, but the mega backdoor Roth through an employer 401(k) can add up to $43,500 more. Not all plans allow this, so check your summary plan description.

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.

Comments (12)

OptimizeEverythingDec 11, 2025
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
MustachianMomDec 10, 2025
I respectfully disagree with point number three. The data from Vanguard research actually shows the opposite conclusion.
RetireEarlyMikeMar 24, 2026
This is exactly what I needed to hear. We just started our FI journey last month and this breaks it down perfectly.
RothLadderRickApr 27, 2026
Shared this with my spouse and we are finally on the same page about our financial goals. Thank you!
OptimizeEverythingApr 14, 2026
Can you do a follow-up article about how this applies to people with variable income? Like freelancers and consultants?
CashFlowKingMay 25, 2026
Great article! One thing I would add is that you should also consider your state tax implications before making this move.
DividendDaveOct 7, 2025
This is a bit misleading. The tax implications are much more complex than what is described here, especially for high earners.
MustachianMomJun 19, 2026
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
BudgetNinjaNov 27, 2025
My financial advisor recommended the exact same approach. Nice to see it validated with actual numbers.
DividendDaveNov 23, 2025
Has anyone tried this with a single income household? We are a one-income family and wondering if the same principles apply.
IndexFundFanJun 13, 2026
This is a bit misleading. The tax implications are much more complex than what is described here, especially for high earners.
RetireEarlyMikeApr 25, 2026
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.