BiggerPockets Money Podcast Your FIRE Number Is Probably Wrong — Here’s Why
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May 8, 2026 They unpack why simple FIRE calculators can be misleading and what common calculation errors people make. They highlight pitfalls like assuming static spending, underestimating healthcare and one-time big costs, and overreliance on the 4% rule. They talk about stress-testing plans, tracking real expenses closely, and keeping optional income streams and low fixed costs to increase retirement flexibility.
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Current Income Is A Poor Proxy For Retirement Spending
- Using current income or generic replacement percentages misleads your FI number and often double-counts retirement savings as needed spending.
- Mindy and Scott urge granular expense tracking (they use Monarch) to map which costs fall away and which will rise before retirement.
Track Transactions Weekly And Use AI To Normalize Spending
- Track every transaction weekly and review categories so you know true annualized spending before projecting a FIRE number.
- Scott recommends Monarch and exporting transactions to AI tools to normalize one-time items and spot trimming opportunities.
4% Rule Only Works For Static Inflation Adjusted Spending
- Treat the 4% rule as a rule of thumb tied to constant inflation‑adjusted spending, not a gospel number for every early retiree.
- Scott highlights research range (≈3% conservative to ≈5% optimistic) and that static spending assumptions break for real-life variable spending.