Hey, itโs Jeffrey โ back again!
I love keeping my investments simple. Iโm a long-term, low-fee, mostly index fund kind of guy.
But thereโs one area where a little complexity can pay off big: tax efficiency.
So this week, I asked ChatGPT to review my actual portfolio and help me answer a question Iโve been thinking about:
โAm I losing money to unnecessary taxes on my investments โ and what should I do about it?โ
Hereโs what happened.
๐ฌ In this email:
๐ง Step 1: Ask AI to Review Your Portfolio for Tax Inefficiencies
๐ชค Step 2: Avoid These Common Mistakes (That Cost You Money)
๐ Step 3: Real Example: A Hypothetical Portfolio, Optimized for Taxes
๐งพ Step 4: Plan Ahead for Capital Gains and Harvesting
๐ What to Do Now
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๐ง Step 1: Ask AI to Review Your Portfolio for Tax Inefficiencies
I started by uploading screenshots of my Roth IRA and Solo 401(k) from Monarch. You can also copy/paste tickers and balances โ ChatGPT doesnโt need perfect data.
Then I asked:
โWhat are the potential tax inefficiencies in this portfolio?โ
ChatGPT gave me a full breakdown. It spotted which funds generate income, what kind of income (dividends, interest, capital gains), and how theyโre taxed depending on the account type.

I didnโt upload any taxable account information, so most of my investments checked out okay for efficiency concerns.
ChatGPT did note this one for me:

Itโs a great gut check โ especially if you mostly set it and forget it like me.
๐ง Step 2: Understand Why Asset Location Matters
Hereโs what I learned (or was reminded of):
๐ฆ Tax-inefficient assets (like bond funds, REITs, and active mutual funds) should live in tax-deferred or tax-free accounts (like a 401(k) or IRA).
๐ฑ Tax-efficient assets (like broad market index ETFs) are fine in taxable accounts โ especially if you plan to take advantage of tax-loss harvesting.
๐ Roth IRAs are ideal for growth-oriented investments, since youโll never pay tax on the gains.
Iโd heard all this before, but having ChatGPT apply it to my actual accounts made the advice feel much more actionable.
๐ Step 3: Ask ChatGPT to Rebalance for You (More Efficiently)
Next, I wanted to see how I could improve my asset location โ not my asset allocation. That means keeping the same mix of investments, but putting each one in the account where it would be taxed most efficiently.
That means: keeping the same overall mix of investments (stocks, bonds, REITs, etc.) โ but placing each one in the account where it would be taxed most efficiently.
To make the exercise more useful, I added a hypothetical taxable brokerage account alongside my real Roth IRA and Solo 401(k).
I asked:
Hereโs a portfolio split across Roth IRA, Solo 401(k), and taxable accounts. Can you show me a more tax-efficient version?
Hereโs the setup I gave it:
๐ Roth IRA โ $80,000
๐ Traditional 401(k) โ $100,000
๐ Taxable Brokerage โ $40,000
I assumed the same assets from Step 1.
The dollar amounts here matter โ because you canโt just shove everything into the โidealโ account type. You have to work within the limits of the space youโve got.
ChatGPT broke down each asset class and recommended where it should live for maximum tax efficiency โ while keeping my overall portfolio the same.

The result is the same portfolio, less tax drag over time, and a clearer strategy for which account gets what.
๐งพ Step 4: Plan Ahead for Capital Gains and Harvesting
Finally, I wanted to prep for tax season.
So I asked:
โWhich of these taxable investments might be good candidates for tax-loss harvesting?โ
โWhatโs the projected capital gains exposure if I sell this holding today?โ
If the current market price of an investment is lower than what you paid for it, you may be able to sell it at a loss โ and use that loss to reduce your taxes.
Hereโs how that looks in practice:

In both cases above, youโd be selling for a loss, and you could harvest that loss to offset other capital gains (or up to $3,000 of ordinary income per year).
ChatGPT gave me some TLH-Safe alternatives for avoiding wash sales:

Quick refresher: the wash-sale rule disallows a loss if you buy a โsubstantially identicalโ investment within 30 days before or after selling. Thatโs why knowing good replacement funds is key.
It also warned me about swaps that might be an issue:

โ ๏ธ A Quick Heads-Up
AI is great for spotting potential red flags, but is not a substitute for a human advisor.
Always run big portfolio changes by a professional who understands your full financial picture and tax situation.
Still, ChatGPT gave me a major head start โ and a few easy wins Iโd been overlooking.
๐ ๏ธ Tools That Can Help
Want to try this yourself? Start here:
๐ง ChatGPT (GPT-4) โ For tax Q&A, asset location, and harvesting ideas
๐ Portfolio Visualizer โ To backtest allocation shifts or compare tax outcomes
๐ฐ Monarch or YNAB โ Track which accounts hold which investments
๐งพ Empower / FutureAdvisor โ Basic but free portfolio checkups
๐ฏWhat to Do Now
โ
Paste a breakdown of your accounts into ChatGPT
๐ฆ Ask for a more tax-efficient asset location
๐ Review your plan for tax-loss harvesting and capital gains
๐ฅ Want the exact prompts I used? Just reply โ Iโll send them over
๐ ๏ธ Want AI tools to help with this? Just reply, and Iโll send you my favorite ones.
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One quick note: This newsletter is for educational purposes only and does not constitute financial advice. Iโm not a financial advisor โ just someone sharing ideas and tools Iโve found useful. Use what works for you, skip what doesnโt, and always do your own research before making financial decisions and using the tools shared in this newsletter.