LedgerLoom Chapter 13 — Payroll as a multi-line event
=====================================================

This chapter shows how to take a **payroll register export** (a CSV from a payroll
provider) and translate it into deterministic **multi-line journal entries**.

What you build
--------------

* A tiny import pipeline for ``payroll_register.csv``
* A deterministic pay-run-to-entry generator that posts:

  * **Gross wages** to expense
  * **Employee withholdings** to payroll liabilities (control accounts)
  * **Employer payroll taxes** to expense + liabilities
  * **Net pay** as a payable that is then paid in cash

* Statutory **remittances** (pay the withholdings + employer contributions)
* A control reconciliation:

  ``payroll register totals → G/L control account balances``

How to run
----------

.. code-block:: console

   make ll-ch13

Artifacts
---------

The Chapter 13 runner writes ``outputs/ledgerloom/ch13`` containing:

* ``payroll_register.csv`` — the sample input register (CSV)
* ``payroll_runs_summary.csv`` — pay-run totals (gross, deductions, net, employer taxes)
* ``payroll_remittances.csv`` — remittance schedule and payments posted in-period
* ``postings_payroll.csv`` — postings generated by payroll runs, payments, and remittances
* ``payroll_control_reconciliation.csv`` — subledger vs G/L reconciliation for key balances
* Standard LedgerLoom artifacts: postings, trial balance, statements, invariants, manifest

Notes and limitations
---------------------

This is a **teaching implementation**:

* The numbers are illustrative (not jurisdiction-accurate tax logic)
* No accrual across periods (the demo posts each pay run on its pay date)
* Remittances are modeled as a single cash payment that clears liabilities

The point is to show a clean, testable pipeline from payroll exports to ledger
postings and control checks.