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AUTHOR: Mark Gardner on 7/12/2026

I used AI as an editorial assistant to help organize and refine my thoughts; the underlying ideas and personal experiences remain my own.

For years, I maintained what I thought was a pretty good retirement spreadsheet. Like many retirees, it tracked my investments, estimated Social Security, projected taxes and summarized spending. Every year I’d update the numbers, glance through a handful of reports and file it away until the next review.

The spreadsheet faithfully answered every question I asked.

The problem, I eventually realized, was that I wasn’t asking very good questions.

That changed when I began experimenting with Claude for Excel. I wasn’t looking for investment advice or another formula. Instead, I asked it to review my workbook the way an experienced retirement planner might. Which reports were actually useful? Which didn’t help me make better decisions? What information was missing?

The conversation quickly became less about Excel and more about retirement.

One discussion started with what seemed like a worthwhile project: calculating my personal inflation rate. I had years of categorized spending, so it sounded straightforward. But after walking through my data, I realized the calculation wasn’t telling me what I thought it was. My spending hadn’t simply increased. It had changed shape. Commuting disappeared. Travel expanded. Healthcare evolved. I wasn’t measuring inflation. I was measuring the transition from working life to retirement.

That realization sent me in a different direction. Instead of calculating another percentage, I redesigned the report to answer more useful questions. Was insurance quietly becoming my fastest-growing recurring expense? Were healthcare costs tracking my assumptions? Were higher travel expenses really a problem—or simply evidence that I was enjoying retirement? Which large expenditures were one-time events that deserved to be ignored rather than projected into the future?

I found myself making similar changes throughout the workbook. Reports that had once been little more than collections of numbers became decision-support tools. The formulas changed surprisingly little. The questions changed almost completely.

What surprised me most was that Claude rarely “solved” anything. More often, it challenged my assumptions. It asked why I had built a report a certain way or whether a particular metric would ever change a decision. More than once, it convinced me to discard a report I’d spent hours creating because it answered a question I no longer cared about.

Those conversations reminded me of something I’ve learned over the years working with good advisors. Their greatest value isn’t having better calculators. It’s knowing which questions matter.

Most of us already have years of spending records, investment summaries and retirement projections sitting in spreadsheets. We tend to think of them as places to store information. I now think of mine as a framework for thinking. The calculations haven’t changed much. My understanding has.

If you already keep a retirement spreadsheet, try a small experiment. Open Claude for Excel and ask it to review a single worksheet—not the formulas, but the usefulness of the report itself. Ask what an experienced retirement planner would want to see, what decisions the report actually supports and, most importantly, what questions you’re not asking.

You may discover, as I did, that the greatest value isn’t another calculation. It’s finding better questions to ask of the information you already have.

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Mark Crothers
1 hour ago

Mark, in the run-up to retiring, I didn’t just look at my retirement spreadsheets every day—I practically lived in them. I was opening them multiple times a day, obsessively tweaking variables and micro-managing scenario tabs like a man possessed.

Yet, since finally stepping away in March 2025, I can count on one hand the number of times I’ve actually launched Excel. Once I finally crossed the finish line, the urge to stress-test my life every twenty minutes completely evaporated.

These days, Claudia AI has basically replaced Google as my go-to query engine for whatever random topic pops into my head. In fact, I occasionally suffer a wave of modern guilt, wondering just how much grid energy I’m burning through just to get an instant, deeply detailed answer to some of the most beautifully inane questions imaginable.

V Saraf
1 hour ago

Mark, thanks for the post! I have not worked with Claude for Excel so far, but use spreadsheets all the time. Used to use macros, but now my needs are fewer and straightforward, and I don’t build reports either. My needs are simple.

It is typical for me to have my earphones on and Claude or Grok on my phone as I walk or bike and have a fairly productive conversation on medical topics. I can drill down as much as I want. As you indicate AI will open up a related topic (rather than a suggestion) that I had not thought of, and I can pursue the conversation in that direction. It is a great learning and research tool.

baldscreen
3 hours ago

Spouse started keeping a spreadsheet after retirement. I had never done this, I did more of a guardrail type budget and sinking funds. So I have no idea if the spreadsheet is good or not? I certainly have no idea what the information tells us. I am going to suggest to spouse to play with AI and the spreadsheet to see if it can tell us anything useful. Thanks for the suggestion, Mark. Chris

Dan Smith
6 hours ago

Mark, all this talk of spreadsheets is going to blow RDQ’s brain apart! 
Seriously, knowing the right questions to ask is important in all aspects of life. Being honest with yourself when answering the questions is important as well. Sounds like AI provided good direction for you.
I often use AI when researching a topic. It’s a bit unnerving when AI engages me in a conversation, as if I were talking to a real person. AI even makes references to my HumbleDollar posts, (at least someone is reading them). 
Thanks for a thought provoking post. 

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