Napkin Math to Freedom

The Napkin Math Retirement Plan (Stop Overcomplicating It)

Stop agonizing over Monte Carlo simulations. Here is the simplest way to calculate your retirement number using the Rule of 25, plus a Javascript calculator to do the math for you.

February 4, 2026 · 2 min
Save Over 1k

10 Ways to Save $1,000 This Year (Without Living on Rice and Beans)

Trying to increase your savings rate without giving too much up or burning the candle at both ends can be difficult. The goal isn’t to stop living; it’s to stop leaking money on things that don’t bring you value. Here are ten strategies—plus a bonus for parents—to keep an extra $1,000 (or more) in your pocket this year. 1. Stop Paying the “Lazy Tax” on Your Cash Most people leave their emergency fund in a standard checking or savings account earning 0.01%. This is a massive mistake. You need to move that cash to where it works for you, not the bank. ...

January 4, 2026 · 6 min · Trevor
Chart showing tax buckets filling up

The 100k Illusion: Why Your Salary is Taxed Double Your Spending

Stop calculating your retirement taxes based on your current paycheck. This is the single most expensive math error high-earners make. It relies on a false assumption: that earning money and spending money are taxed the same way. They are not. Here is the breakdown of why earning $100,000 today is radically different than withdrawing $100,000 in retirement. The Earning Side: The “Top Dollar” Problem When you are working, every extra dollar you earn (or save) is taxed at your highest rate. This is your Marginal Rate. ...

December 21, 2025 · 3 min