Everything in this course so far has been a decision: how much cash to keep before investing, what to buy, how much risk to hold, when to rebalance. You have made maybe six decisions in total. That’s the good news about sensible investing — there are shockingly few decisions in it.
The bad news is that markets will invite you to remake those six decisions every week for the rest of your life. A crash will ask whether you really want 70% stocks. A bubble will ask whether index funds aren’t a bit slow for someone as sharp as you. A colleague’s exciting stock tip will ask what one small exception could hurt.
An investment policy statement is how you answer all future invitations at once. Institutions use them so that no board member can improvise with the endowment. Yours has the same job. The improviser it guards against is you — specifically, the future version of you that is scared, or greedy, or bored. Present-you, calm and reading an article on a normal day, is the most qualified version of you that will ever exist. Let that person write the rules.
What goes on the page
One page. Not a binder — a binder won’t be reread during a panic, and this document’s entire value is that it gets reread during a panic. Seven short sections:
1. Purpose. One sentence on what this money is for and when you’ll need it. “Retirement in roughly 30 years, and nothing else.” The date matters: it’s the answer to every “but what about right now?” the market will ever ask.
2. Contributions. How much goes in, and when. “1,000 on the 5th of every month, automatically, raised each year with my salary.”
3. What I own. The target allocation and the actual funds, by name. “70% global stock index fund, 30% aggregate bond index fund.” Two or three lines. If your holdings need more, that’s the policy telling you something.
4. What I don’t own. The exclusion list, written while calm: individual stocks, crypto, leverage, anything I heard about at a party, anything I can’t explain in two sentences. This section exists because exceptions never announce themselves as exceptions; they arrive as opportunities.
5. Rebalancing. Your rule from the last article, verbatim.
6. In a crash. The section you’re really writing. “Prices will fall 30% or more at some point. When it happens: contributions keep running, rebalancing happens on schedule, nothing is sold. I wrote this knowing the reasons to sell would sound convincing at the time.” That last clause is the important one — it pre-refutes future-you’s best argument, which is always “but this time is different.”
7. Amendments. How the rules may change: “Only in writing, only after 30 days of waiting, never during a drawdown.” A rule change that can’t survive a 30-day cooling-off period wasn’t a plan; it was a mood with paperwork.
Then the date and your signature. Signing a document does something a note in your phone doesn’t. It creates a small ceremony, and ceremonies are surprisingly load-bearing in personal finance.
Does a page of paper actually work?
Not by magic. You can ignore it; no alarm sounds. It works through two humbler mechanisms.
First, it converts temptation into confrontation. Without a policy, buying a hot stock is just a small act. With one, it requires either amending a signed document through your own 30-day rule, or looking at section 4 and doing it anyway. Most impulses can’t survive that much friction; friction is the point.
Second, it collapses decision fatigue at the worst moments. Investors who sold in past crashes rarely woke up planning to. They drowned in a hundred small “should I?” moments, and one of them finally won. With a policy, there is exactly one question during a crash: “Am I following the page?” One question is survivable. A hundred are not.
Write it now, not later
Draft it today, while nothing dramatic is happening — the whole document depends on being authored by calm-you. Take the six decisions you’ve already made across this course, put them in the seven slots above, sign, date, and store it where the panic will find it: printed by the desk, pinned in your notes app, or both.
Congratulations. You now have what most investors never get around to owning: not a portfolio (those are easy) but a written relationship with your own future behavior. The rest of this site refines the details. The page is the thing.