What's in focus
The SaaS extinction event
What's new:
Writer and technologist Craig Mod just built a fully custom, multi-currency accounting system in five days — no dev team, no vendor, no subscription. Using Claude Code, he replaced a decade-long patchwork of Quicken, Google Sheets, Google Scripts and Japanese accounting software with a single Python application that handles cross-border income, automatic expense categorization, FX reconciliation, 1099 and K1 ingestion, and country-specific tax formatting. He calls it TaxBot2000, and the best accounting software he’s ever used.
How it works:
TaxBot2000 ingests CSV files from any bank or institution, pulls historical FX rates, categorizes transactions using learned patterns and reconciles international wire transfers — accounting for timing delays and rate discrepancies between originating and receiving banks. Mod feeds it prior tax returns as training data, drops in 1099s, K1s and PDFs, and the system categorizes and packages everything for his accountants in both US and Japanese formats. When anomalies surface, he talks directly to the AI to brainstorm batch fixes, often producing new features in the process.
Behind the news:
This isn’t a tech demo — it’s a working system replacing commercial software for a real taxpayer with genuinely complex financials: multi-country freelance income, publishing royalties, membership revenue, Shopify e-commerce, public and private investments, and expenses split across wire transfers and credit cards in multiple currencies. The pattern Mod describes, where off-the-shelf tools force painful workarounds that eventually collapse under complexity, is one every multi-entity practice or international client engagement will recognize. What’s new is that the build-it-yourself alternative just went from “hire a developer for six months” to “one motivated person, five days.”
Why it matters:
For accounting and finance professionals, this is a signal flare. The clients who today tolerate clunky integrations and manual reconciliation workarounds are about to discover they can build tools shaped precisely to their situation handling the edge cases commercial software ignores. That’s a threat to firms selling standardized workflows, and an opportunity for advisors who can help clients architect these bespoke systems or build them in-house. Mod’s TaxBot2000 already does what many firms charge advisory fees to manage: holistic cross-border financial visibility with automated categorization and tax-ready packaging. The five-day build timeline compresses a value proposition that used to justify annual engagements.
We're thinking:
The profession’s competitive moat has never been data entry or software operation; it’s judgment, interpretation and the trust clients place in that expertise. But a significant layer of billable work sits between those two poles: the wrangling, reformatting, reconciling and categorizing that consumes hours before judgment even begins. That middle layer just got automated by the client themselves. The firms that thrive won’t be the ones competing with TaxBot2000 on data processing speed. They’ll be the ones helping clients navigate an increasingly fragmented tool landscape — guiding how these systems are structured, validated and connected — and then providing the strategic advisory layer on top. The question for every practice leader isn’t whether clients will start experimenting with custom financial tools, it’s whether you’ll be the one they trust to make sense of them.




