Sell in May and Go Away? Why Dividend Investors Are Better Off With Rules

Every year around this time the same four words show up in market commentary: "Sell in May and go away." After the spring we just had, the temptation to act on it is stronger than usual. This article looks at why a written reinvestment rule is a better answer for dividend investors than a calendar or a headline.

A Spring That Tested Everyone's Discipline

The first months of 2026 were not kind to anyone who checks their portfolio daily. The conflict in the Middle East escalated in late February, oil supplies through the Strait of Hormuz were disrupted, and the S&P 500 slid until it bottomed on March 30 at 6,343.7. A ceasefire between the United States and Iran in April brought a sharp relief rally. Then, in the first days of May, fresh reports of missiles intercepted over the Gulf pushed stocks lower again and oil back up.

In that kind of market, "go away until autumn" sounds like common sense. It is worth asking what it would actually mean for someone who invests for dividends.

What "Sell in May" Really Claims

The adage is based on an old observation that stocks have historically done better between November and April than between May and October. The pattern is real in some long data sets, but it is inconsistent: plenty of summers have been strong, and the gap between the two halves varies a lot from decade to decade. It is a statistical tendency, not a rule you can plan cash flows around.

More importantly, the adage was written for traders who measure success by price alone. Dividend investors measure something else.

Why the Adage Fits Dividend Investors Badly

• The dividend calendar does not take the summer off. Quarterly payers on the February, May, August and November cycle and the March, June, September and December cycle all go ex-dividend during the "away" months. Selling in May means you are not on the register for those payments.
• Selling creates work and, in taxable accounts, tax events. Getting back in later means a second set of decisions and a second set of trades, usually at a price you did not choose.
• Cash still arrives. Even if you keep your positions, dividends keep landing in your account all summer. The real question is not whether you are "in" or "out", but what you do with that incoming cash.

The Question That Actually Matters: What Happens to New Cash?

Most investors never sell in May. What they do instead is subtler: they hesitate. A dividend lands, the news looks bad, and the cash sits until things "calm down." By the time they do, the moment has passed and the allocation has drifted. We wrote about the cost of that hesitation in Why Waiting to Reinvest Costs You Thousands.

A written rule removes that hesitation. It decides in advance, in a calm moment, what happens to every dollar that comes in.

Three Rules That Replace the Calendar

1. Reinvest into what is underweight, not into what is in the news

Set a target weight for every holding. When cash arrives, send it to the positions that are furthest below target. In a spring like this one, that usually means buying the parts of the portfolio that fell the most, without having to make that call under stress.

2. Set a minimum order size

Small dividends do not need to be invested the minute they arrive. A threshold, for example "invest once available cash exceeds $100", keeps orders meaningful and avoids a stream of tiny trades, while still making sure cash does not sit for months.

3. Decide in advance what is allowed to pause the rules

Write down what would make you change your plan: a change in your goals, your income needs or your target allocation. A headline is not on that list. If you want to pause, you pause deliberately, not by default.

An Example Rule Set

Here is what that looks like for a simple five-position dividend portfolio. It is an illustration, not a recommendation:

• Targets: dividend-growth ETF 30%, high-dividend ETF 20%, REIT 15%, utility 15%, consumer staples stock 20%
• Trigger: available cash above $100
• Action: buy the position(s) furthest below target until the cash is used
• Review: targets reviewed once per quarter, never in response to news

Whatever the market does in May, June or July, this portfolio keeps doing the same boring thing: putting new cash to work where the plan says it belongs.

What a Rule Does Not Do

A rule does not predict the market and it does not protect you from a drawdown. If stocks fall in the summer, a rules-based portfolio falls too. What it does is remove the second layer of damage: cash left idle, buys made at random moments and an allocation that slowly stops matching your plan.

Why I Automated This for Myself

I built Compountr because I was running exactly these rules by hand across several brokers, and I noticed that my discipline depended on my mood and my calendar. Automating the execution does not make the decisions for you. You still set the targets and the thresholds, and you can pause at any time. It just makes sure that what you decided on a quiet Sunday is what actually happens on a noisy Tuesday.

If you want to see how a reinvestment rule would have behaved for a specific stock or ETF over past market cycles, DRIPanalyzer lets you backtest it for free.