How We Achieved Cost Segregation Studies

By Andrew Sullivan · September 10, 2025 · 40 min read

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. For more on this topic, see Estate Planning Basics.

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 Lifestyle Design Choices.

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. For more on this topic, see Small Business Retirement Plans.

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

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 Tax Loss Harvesting.

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 bucket strategy for retirement income divides assets into near-term spending needs covered by cash and short-term bonds and long-term growth assets in equities. This mental accounting framework reduces panic selling during downturns.

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 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.

Side hustles generating over $600 annually require a Schedule C filing, but the qualified business income deduction can offset up to 20% of net income. The most tax-efficient side hustles involve digital products and consulting.

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.

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.

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.

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.

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.

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.

Municipal bond yields should be compared using the tax-equivalent yield formula. In the 32% federal bracket, a 3.1% muni yield equals a 4.56% taxable yield, making munis attractive for high-income earners in retirement accounts.

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.

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.

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.

Comments (12)

PassiveIncomeProJan 5, 2026
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
BudgetNinjaJul 9, 2026
I respectfully disagree with point number three. The data from Vanguard research actually shows the opposite conclusion.
WealthBuilder99Feb 25, 2026
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
IndexFundFanMar 17, 2026
Great article! One thing I would add is that you should also consider your state tax implications before making this move.
PassiveIncomeProOct 16, 2025
Bookmarked this. Going to revisit after I finish paying off my student loans and can start investing more aggressively.
PassiveIncomeProAug 14, 2026
Great article! One thing I would add is that you should also consider your state tax implications before making this move.
SavingsQueenFeb 2, 2026
We implemented this strategy after reading your previous article and our savings rate went from 22% to 41% in six months.
CashFlowKingJan 26, 2026
We implemented this strategy after reading your previous article and our savings rate went from 22% to 41% in six months.
PassiveIncomeProJun 7, 2026
This is exactly what I needed to hear. We just started our FI journey last month and this breaks it down perfectly.
MustachianMomMar 26, 2026
We implemented this strategy after reading your previous article and our savings rate went from 22% to 41% in six months.
FireWalkerAug 29, 2025
I have been doing this for 3 years now and can confirm these numbers are pretty close to what I have experienced.
GeoArbitrageGalJan 13, 2026
This is exactly what I needed to hear. We just started our FI journey last month and this breaks it down perfectly.