Investment Policy Statement (IPS)

An investment policy statement (IPS) is a written document governing how a portfolio is managed: the objectives the money serves, the target asset allocation and its permitted ranges, how and when the portfolio is rebalanced, what kinds of investments are allowed or excluded, and how performance will be judged. Long standard for pension funds and endowments, the same tool works at household scale — it converts investment strategy from a set of moods into a set of commitments made in advance.

A useful IPS is specific where it counts. "Invest for growth" is decor; "70% global stocks / 30% bonds, rebalance when any asset class drifts more than 5 percentage points from target, review annually each January" is policy. Typical sections for a household IPS: purpose and goals with timelines; return needs and risk parameters (informed by both risk tolerance and risk capacity); the target allocation and ranges; investment selection criteria — for many index-fund investors, literally "broad-market funds with low expense ratios"; rebalancing method; contribution and withdrawal policy; and a change rule, such as requiring any allocation change to wait 30 days and survive a second reading.

The change rule is the quiet hero. The document's whole value is that it was written by the calm version of you, and it binds the panicked or euphoric version — but only if changing it takes deliberate effort. For couples, drafting an IPS also forces the useful argument early: it reconciles two risk appetites into one policy before a bear market does it the expensive way. When advisors manage money, regulators expect the strategy to fit the client; the IPS is where that fit is written down. For a DIY investor working with an advice-only planner, a jointly drafted IPS is often a core deliverable of the engagement.

Writing one takes an evening: state the goals, set the allocation, define the rules, sign it, and put a review date on the calendar.

A hypothetical example of the rules doing their job: Lena's IPS sets a target of 70% stocks / 30% bonds on her $400,000 portfolio — $280,000 / $120,000 — with a rule to rebalance whenever either side drifts 5 percentage points from target. A strong stock run lifts her stocks to $380,000 while her bonds hold at $120,000 — a 76/24 mix on what is now a $500,000 portfolio. Her IPS doesn't ask how she feels about the rally; it says sell stocks and buy bonds back to 70/30 — moving roughly $30,000 out of stocks at elevated prices. A year later a bear market knocks the mix to 63/37, and the same rule now points the other way: buy stocks while they're down. Without the document, both moves would have required courage at exactly the moments courage is scarce; with it, they're just maintenance.

Pros

• Pre-commits you to sensible behavior, which matters most at market extremes when judgment is worst.
• Makes success measurable — you either followed the policy or you didn't, which is more useful than second-guessing returns.
• Aligns couples, and any advisor involved, around one written strategy instead of competing instincts.
• Cheap insurance: a page or two of writing that can prevent five- and six-figure behavioral mistakes.

Cons

• Only works if honored — a document you override whenever it's inconvenient is worse than none, because it teaches you your rules are negotiable.
• Can be written too rigidly, failing to accommodate genuine life changes like a job loss or inheritance (good ones include a deliberate amendment process, not a prohibition on change).
• Vague versions provide the feeling of discipline without any of the substance.