Prompttax_finance Verified June 14, 2026 · Claude Opus 4.8 (also works on Sonnet 4.6)
Build a Penalty & Interest Estimator (IRS ballpark, figures only)
Claude returns one HTML file (an artifact). Enter a balance and months late → a ballpark of failure-to-file + failure-to-pay penalties and interest, each component shown, with the total and a clear “not exact — verify at IRS.gov” disclaimer. Runs offline; figures only.
Made for:ClaudeClaude Cowork
What you need
A Claude account (free tier works). No connectors. Save the file as penalty-interest-estimator.html and open it in any browser. Figures only — never names or SSNs. Ballpark estimate — confirm the current IRS interest rate and any abatement relief.
What it looks like
1. 1. Enter figures only — unpaid balance, months late, and the current interest rate.2. 2. A ballpark total: failure-to-file + failure-to-pay penalties and interest, with each component and a verify-at-IRS.gov disclaimer.
The prompt
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