Learn / Part 2 · Running Your Own Finances
Your Personal Financial System
How do you turn income into a system you can run?
In brief
A personal financial system sends money where it needs to go without relying on willpower: commitments, a margin, a buffer, goals and protection, each with a place.
Key ideas
Pay yourself first
Decide the amount to save or invest and move it before spending begins.
Make an insight card →Margin is the engine
A steady margin does more for your future than a rising income that is fully spent.
Make an insight card →Keep it simple
A few accounts with clear jobs are easier to keep up than a complicated set-up.
Make an insight card →Try it
Margin & net worth
Two numbers describe any financial life: the monthly margin (a flow) and net worth (a stock). Income alone says neither.
Open the full page: formula, variables, worked example and cautions →
Also relevant: Goal calculator
Red flag
A budget so strict it only works for a month.
Ask before you sign
- What is my margin, honestly?
- Where does each amount go before I can spend it?
Do this week
Name your accounts by job (bills, spending, buffer, goals).
Try it · 10–45 minutes
Draw your system on one page: where income lands, what is paid automatically, where savings go.
See it in a life
Cases that bring this chapter to life
Connected ideas
Where else this shows up
Chapter 1
The Language of Money
Shares: Net worth, Monthly margin · same tool
Chapter 8
Priorities: What to Do First
Shares: Buffer (emergency fund), Monthly margin · same tool
Chapter 25
Wealth, Time and Your Financial Strategy
Shares: Monthly margin, Net worth · same tool
Chapter 7
Resilience: Buffers, Shocks and Irregular Income
Shares: Buffer (emergency fund)
Pause and reflect
Private to this device. Nothing is sent anywhere.
Words worth knowing
- Monthly margin
- What is left of take-home pay after commitments and everyday spending. The raw material of wealth.
- Net worth
- Everything you own minus everything you owe, at a point in time.
- Buffer (emergency fund)
- Accessible money set aside to absorb shocks, so a surprise bill does not become a debt.
Companion notes written for this website, based on the topics of Chapter 6. They explain ideas and do not reproduce the book. General information, not personal advice.