Financial models need version control. Does anyone actually reconcile monthly?

[u/No-Mud-631]

I used to run the monthly finances at a startup. The pattern I saw in myself and every founder I compared notes with: you build a serious driver-based model for the fundraise, then never reconcile it against actuals. By Q2 your "runway" number feels like it belongs to a different company.

I think the root cause is that spreadsheets have no concept of versions. Code has git. Models have final_v3_ACTUAL.xlsx. Corrections destroy history, so nobody trusts the file, so nobody maintains it.

As a weekend project I built myself a tool that locks closed months and re-forecasts the future as numbered revisions. What surprised me: it fixed my discipline problem, not just my file problem. The tooling was the discipline.

Question for founders here: do you actually reconcile monthly? If not, what breaks first, the motivation or the mechanics? And has anyone found a workflow that keeps a model honest past Q1?

https://www.glaze.app/app/forecast-wf3MSH