Section 01 — Core Systems

The core systems are the practical heart of Safe Harbor. The goal is to build simple systems that make the safer choice the default.

The Safe Harbor Pilot Boat

Steady Guidance, Safe Arival

Most tax advice tells you to “estimate your taxes,” which sounds reasonable until you try to do it and realize you’re basically guessing and trying to hit a moving target. Income shifts, withholding changes, and the rules care not just how much you pay, but when you pay it …

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Combining the Core Systems

Below is a diagram that shows the accounts and credit cards involved in the core system.

The top part, withholding, is governed by the Safe Harbor Pilot Boat. The middle part, the direct-deposit accounts, is governed by the Waterline Budget. The bottom part, the credit cards, is governed by the …

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Finding the Smooth Sailing Buffer

Method in a nutshell

  • Use a spreadsheet to model the Smooth Sailing account.
  • Enter the account's expected transfers in and transfers out by date.
  • Start the modeled running balance at zero.
  • Let the modeled balance go negative.
  • Find the lowest negative balance in the model.
  • Turn that number positive.
  • Round …

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Section 02 — Credit Cards

Section 03 — Saving & Investing