A Simple Scorecard to Check Your DIY Investing Habits

Managing your own investments sounds like a straightforward way to save money. No advisory fee, no middleman, more of your returns stay with you.

But the question worth asking isn’t whether you could do this well. It’s whether you are. Not on a good day when you’re motivated and paying attention. On a regular day, when the market has been quiet for three months, and you haven’t opened your brokerage account in a while.

That gap between the investor you plan to be and the investor you are in practice is where most of the money gets lost.

Here’s an honest look at the most common investing behaviors — and a framework for evaluating whether you’re actually doing them.

A scorecard for your actual investing habits

Think of investing behaviors on a three-tier scale based on how likely most people are to actually follow through:

• Green: Most informed investors do this reasonably well on their own.
• Yellow: A lot of investors do this inconsistently, or skip it altogether.
• Red: Most DIY investors fail to do this correctly over time, even when they mean to.

Answer based on what you’ve actually been doing. (Not what you intend to do going forward.)

The green zone: Where most people do fine

Choosing index funds and avoiding high-fee actively managed products is something most informed investors get right. This is the green zone behavior. If you're already using low-cost funds with tight expense ratios, you're ahead of a significant portion of the market. 

The yellow zone: Market timing is sneakier than you think

Ask most DIY investors if they time the market and they’ll say no. But most people have a narrow definition of what market timing looks like.

Market timing isn’t just selling everything and moving to cash when things get scary. It’s also:

• Increasing contributions when the market is doing well.
• Slowing down or stopping contributions when it drops.
• Piling into whatever asset class has been hot and ignoring what hasn’t.

If you’re being honest with yourself, most people do at least one of these. That’s the reason this one is yellow — not because it’s low risk, but because most people won’t give themselves a straight answer.

The red zone: Three behaviors where good intentions aren’t enough

These are the most common mistakes DIY investors make. Even the motivated and knowledgeable ones often don’t execute these consistently.

Tax-efficient asset location

Most people spend a lot of time thinking about the best investments to contribute to. Almost nobody thinks about where to hold it.

Here’s the short version: tax-inefficient investments — like real estate investment trusts (REITs), taxable bonds, and international stocks with higher dividend yields — belong in retirement accounts where the tax treatment doesn’t hurt you. Tax-efficient investments, like U.S. equity index funds, belong in your taxable brokerage account.

If you’ve got REITs sitting in a brokerage account, or you’re holding a lot of cash in a high-yield savings account and paying ordinary income tax on the interest, that’s real money going to the IRS that didn’t have to.

Tax-loss harvesting

Tax-loss harvesting is one of those strategies that almost everyone knows about and almost no one actually does properly. Tax-loss harvesting is selling a position that’s down, buying something similar to keep your allocation in place, and using the loss to offset gains or reduce your taxable income.

The problem is the wash sale rule, and specifically the part that people miss because it applies across all of your accounts at the same time.

If you hold a total stock market index fund in your IRA and try to harvest a loss on that same fund in your brokerage account, you’ve triggered a wash sale. Doing this right means watching your entire portfolio at once, all the time. 

Managing cost basis

When did you last log into your Vanguard, Fidelity or Schwab account and deliberately choose a cost basis method? Not just check it, but actively select it with a tax strategy in mind?

For most DIY investors, the honest answer is never. The brokerage sets a default, and that default sits there indefinitely.

The problem is that default methods aren't designed with your tax bill in mind. They're designed for administrative simplicity. The difference between a default method and an optimized one can add up to a lot of unnecessary taxes over the life of a portfolio, particularly when you start drawing it down.

Rebalancing

Rebalancing means selling what has outperformed and buying what has underperformed to get back to your target allocation. It feels counterintuitive, which is exactly why most people don’t do it.

But failing to rebalance adds risk and, over time, can hurt returns. 

Setting up automatic contributions and never looking at your allocation again isn’t a rebalancing strategy. It’s just investing on autopilot. Actual rebalancing requires you to look at what you own at least once a year and make deliberate trades based on what’s drifted.

What your past behavior tells you

Here is the uncomfortable truth about this kind of self-assessment: Past behavior is your best predictor of future behavior.

If you haven’t been doing tax-loss harvesting, you’re not going to wake up tomorrow and start doing it consistently. If your cost basis settings are still on the default at Vanguard or Schwab, that tells you something real about how closely you’ve been managing this. If you’ve never rebalanced, putting it on a to-do list is not the same as doing it.

This isn’t criticism or judgment. Most people who manage their own money are smart, capable and genuinely interested in doing this well. 

The issue is that these behaviors require ongoing, active attention in a way that most people underestimate.

What a good advisor actually does (and when it’s worth paying for)

Not every advisor earns their fee. Some collect 1% assets under management (AUM) and provide behavioral coaching, which has real value, but doesn’t address the tax-side work that accounts for most of the performance gap. 

If an advisor isn’t doing active tax-loss harvesting across your full portfolio, managing your cost basis, keeping your asset location optimized, and making sure you rebalance regularly, they may not be doing enough to justify what they charge.

And if you’re going to manage your own money, ask yourself which of those red behaviors you’ve been doing correctly… and consistently. If the honest answer is most of them, you may be in good shape. If it isn’t, the advisory fee you’ve been trying to avoid may already be costing you more than you realize. You just can’t see it on a statement.

If you'd like help running the actual numbers on your situation, that's exactly what we do at SLP Wealth.