Fix it before the deadline
Platforms, tax rules and APIs change on fixed dates. deadlinefix finds the exact error or form change before it hits, and writes the fix with the vendor's or regulator's own source.
Free tools
W-2 code TT calculator (2026)
The FLSA overtime premium per workweek for box 12 code TT, for one employee or a whole payroll CSV. W-2s due 1 February 2027.
AI model retirement scanner
Finds gpt-4o, gpt-4o-mini, Claude Sonnet 4.5 and other retiring model IDs in n8n workflows, code and config, with the shutdown date and what to move to.
Breaking soon
Firebase: Runtime Node.js 20 was decommissioned
Google decommissioned the Node.js 20 runtime for Cloud Functions (Cloud Run functions) on 30 October 2026, so the Firebase CLI refuses to deploy functions that still target it.
Google Cloud Python: non-supported Python version (3.10)
Python 3.10 reached end of life in October 2026, and Google's Python client libraries (google-api-core and everything built on it: google-cloud-storage, bigquery, pubsub, firestore and more) stopped supporting it a week later.
OpenAI: "The model … has been deprecated" or "Model not found" after a shutdown
OpenAI has shut down the model your request names, so the API refuses it.
All error fixes · W-2 code TT situations and payroll software