I'm a CPA and I built a tool to model different paths to FIRE - curious how others do this
Hi everyone,
I've been thinking a lot about how people actually model their path to FI.
I'm a CPA, and I ended up building a personal finance app with my sister because I couldn't find something that let me easily model the messier parts of real life.
Most FIRE calculators seem to assume a fairly straight line: current net worth → annual contributions → retirement → withdrawals.
But real life isn't always like that.
The part I built that I'm most interested in is phase-based projection.
You can set up different periods of your life with different assumptions, for example:
Working → Career break → Back to work → FI
Each phase can have different income, spending, contributions, withdrawals and return assumptions.
Then you can create separate scenarios and compare them.
For example:
- Keep working until 40
- Take 2 years off at 35
- Work part-time for a few years
- Increase savings by $10k/year
- Move somewhere with a lower cost of living
- Retire earlier but spend more
And see how each one changes the projected net-worth trajectory.
The rest of Anvi is the more traditional personal finance side — statement importing, smart transaction categorization that learns from your corrections, spending analysis, budgeting based on historical spending, recurring transactions, net worth tracking, etc.
One other difference: there are no bank connections. You upload a PDF/CSV statement and Anvi extracts the transactions. The original statement is discarded rather than stored.
It's live at myanvi.co and works in a browser on phone or laptop. We're planning App Store/Google Play availability in September.
I'm not really trying to convince anyone to use another finance app. I'm more curious about how other people here actually do this.
Do you model different life scenarios when planning for FI, or do you mostly use one projection and update it as things change?
If you already have a spreadsheet/tool that does this really well, I'd genuinely be interested in seeing what your setup looks like.
I've love to hear your thoughts/ideas! Thank you!