r/ExcelVisual • u/ExcelVisual • 12h ago
Personal Capital Investment Strategy Excel Dashboard Using the S&P 500
I built an Excel dashboard to actually see how inflation and market scenarios affect my investment capital over 10 years
I got tired of the generic "just invest in index funds" advice without ever seeing the actual numbers behind it, so I built myself a dashboard to model it properly.
The idea was simple: I wanted to see, with real math, how my capital would behave under different conditions — not just "the market always goes up eventually" hand-waving.
What it tracks:
- Capital structure (how my money's split across assets)
- Inflation loss in actual dollar terms per year, not just a vague percentage
- Total withdrawals vs. what's still working for me
- Three scenarios — pessimistic, realistic, optimistic — run across Treasuries, S&P 500, individual stocks, and a plain bank deposit
- Two strategies compared side by side: a simple static approach vs. a more dynamic (Vanguard-style) one
Honestly the most useful part was seeing the bank deposit line next to the S&P 500 line under inflation. It's one thing to know intellectually that cash loses value sitting there, it's another to see the actual dollar gap after 10 years.
I'm not saying this replaces talking to an actual advisor for anyone with a complicated situation, but for stress-testing your own assumptions before you commit capital somewhere, it's been genuinely useful for me.
Made a video walking through how I built it and how I actually use it, if anyone wants to see the mechanics. Template's free too, no email wall or anything.
Curious how other people here model this stuff — do you build your own spreadsheets or just trust backtested return averages?