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DIME framework: Debts $315K + Income replacement $1.275M + Mortgage already counted + Education $200K = $1.79M needed. Subtract existing $650K (savings + spouse income capacity) = $1.14M coverage gap. 20-year term: $40-60/month.

Insurance brochures advertise the headline gain. Run the same numbers as IRR — accounting for the fact that you paid in over 20 years, not all on day 1 — and the return drops to bond-fund territory.

Minor kitchen 70%, major kitchen 50%, bathroom 60%, pool 30%. Cost vs Value 2026 data shows almost no renovation recoups 100% at sale. The honest ROI lives in personal-use years, not resale dollars.

Reusable bottle break-even at use 17. Coffee thermos at use 7. Lunch container at use 5. The numbers are great. The catch: realistic adoption is 50-70%, which doubles all the break-even points.

Energy upgrades ranked by payback period: LEDs (months), smart thermostats (1-2 years), insulation (3-5 years), heat pump (5-8 years), windows (20-40 years, often never). Start with the cheap fixes.

Etsy seller does $2,000/month in sales. Strip out materials, fees, shipping, ads, taxes, then divide by all the hours. Real rate: $8.60. Below federal minimum wage. Three conditions where it's still rational to keep going.

7kW residential system in 2026: $18-22K gross, $8-15K net after federal 30% ITC + state incentives. ~$2K/year savings → 6-year payback. Then 19+ years of essentially free electricity. Math depends entirely on local sun + rate.

Runway = cash ÷ net burn. Easy to compute, easy to get wrong because both inputs change. The non-obvious correction: start fundraising when you have 9 months left, not 4. Here's why.

$1,500 movers + $3,000 deposit + $1,000 overlap rent + $500 utility setup + $1,000 furniture + $400 takeout = $7,400 total for a 'simple' local move. Long-distance doubles it. The math behind why moves always cost more than expected.

5-year-old used car at $15K: + $7K insurance + $5K fuel + $4K repairs + $1K registration − $5K resale = ~$32K total. Same car bought new at $30K runs ~$58K over the same 5 years. Used wins, but not by as much as the sticker suggests.

$100/month feels too small to bother with. But run it through 30 years of compounding and the number lands at $122K. Plus the harder lesson: starting at 25 with $100 beats starting at 35 with $200.

Lump sum $50K at 7% turns into $381K in 30 years. Add $500/month and it hits $988K. But inflation cuts that nominal $988K down to $406K of real purchasing power. Both numbers matter.

Holland's RIASEC model has been used by US Department of Labor + most career counselors since 1959. 30 questions output your Holland Code (top 3 of 6 dimensions), matched against ~100 career profiles. Not magic — a structured starting point.

A $5K balance at 22% APR with a 2% minimum payment takes 23 years to clear and costs $11K in interest. The minimum payment formula is engineered to maximize bank revenue, not to help you escape.

Working backwards from a $6K/year dividend goal: $300K at 2% yield, $200K at 3%, $150K at 4%, or $100K at 6%. Each yield band has different risk; the lowest portfolio target isn't always the best target.