EP Finance Tax US
EP Finance Tax US turns what is already in your ledger into the figures a US federal return asks for, and keeps an eye on where you might be creating a sales-tax obligation.
This page documents EP Finance Tax US 0.1.4.
Published by ElmsPark Studio.
Requirements
Section titled “Requirements”- PageMotor 0.9b or later
- EP Finance, which holds the ledger these figures are computed from
Schedule C
Section titled “Schedule C”Per-line totals for the Schedule C, with a warning list naming any category that is not yet mapped to a line. An unmapped category is the usual cause of a total that does not match expectations, so it is surfaced rather than quietly dropped.
Quarterly estimated tax, with the arithmetic shown
Section titled “Quarterly estimated tax, with the arithmetic shown”A worksheet rather than a single number: self-employment tax at 15.3%, the deduction for the employer half, and both the 100% and 110% safe harbours, each step visible. You should be able to see why the figure is what it is, and hand the working to somebody else.
Contractors and the 1099-NEC
Section titled “Contractors and the 1099-NEC”Payments to contractors are tracked through the year, with a year-end report of anyone over the $2,000 threshold that applies for 2026.
Sales tax
Section titled “Sales tax”A per-state filing prep, plus a nexus watch that measures your activity against a shipped table of state thresholds, so you are told when you are approaching an obligation in a state rather than discovering it afterwards. The threshold file is updatable.
Stripe Tax figures can be ingested where you use it, behind a feature flag.
Document stamps
Section titled “Document stamps”Every accountant pack this plugin produces carries a stamp on its cover: a number and the first characters of a fingerprint taken over every other file in the pack.
If somebody sends you a pack, or you open one from a year ago, you can check whether its contents are exactly what was recorded when it was produced. The cover tells you how, in three steps with ordinary tools, because a verification scheme nobody can run is decoration.
It is not a signature. It says nothing about who produced the pack, only whether the contents have changed since. Anyone with access to the database could write a matching record. It protects against accident, drift and quiet edits, not against a determined party with that access, and the cover says so in those words.
Regenerating a pack records a new stamp rather than replacing the old one, so the history itself shows when a period’s figures moved between one generation and the next.
Changelog
Section titled “Changelog”- Works with PageMotor 0.11.3 and stays compatible with earlier releases. PageMotor 0.11.3 changed how a plugin declares its API and MCP actions, and a plugin that still uses the old declaration has every one of its actions silently dropped from the registry on that version. This release declares its actions in the shape the running PageMotor expects, so an AI connected over API or MCP keeps every action whether the site is on 0.11.3 or on an earlier release.
- Actions are now grouped into families, so a connected AI that looks up one action is shown its siblings.
Released 9 September 2026.
- Every accountant pack now carries a document stamp. The cover page prints a stamp number and the first characters of a fingerprint taken over every other file in the pack, so you can check whether a pack’s contents are exactly what was recorded when it was produced.
- The cover explains how to check it by hand, in three steps using ordinary tools.
- It is not a signature. It says nothing about who produced a pack, only whether the contents have changed since.
- Regenerating a pack records a new stamp rather than replacing the old one, so the history shows when a period’s figures moved between generations.
- Requires EP Finance 0.6.0 or later. With anything older the pack is produced exactly as before, without a stamp block.
Released 1 September 2026.
- Some of this plugin’s actions used to appear as their own entries in the tool list of any connected AI client. That surface is reserved for PageMotor itself, so those entries have been removed.
- Nothing became unreachable and nothing else changed. Every action still works exactly as before through PageMotor’s own dispatch, with identical responses. Only a caller that had been invoking one of those names directly is affected, and it should dispatch through PageMotor instead.