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wanderbooks/docs/parity.md
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swaitsandClaude Opus 5.5 f858fb4cfe feat: tax categories and the tax summary report
wanderbooks is a general MCP-first accounting application: every
business needs its accounts mapped to where they land on its income tax
return, and its CPA needs book-to-tax differences surfaced, not hidden.

- ledger_core::tax: a catalog of stable categories (gross_receipts,
  commissions_fees, meals, guaranteed_payments, officer_compensation,
  nondeductible, ...) with kind (income, cost of goods, deduction), the
  returns each appears on (Schedule C, 1065, 1120-S, 1120), a default
  deductible percent (meals 50, nondeductible 0), and guidance. Keys,
  not line numbers: form lines move from year to year.
- Accounts carry tax_category and an optional deductible_percent
  override, validated against the account type (and the return, at the
  MCP layer), journaled as account.tax_set, replayed, projected (schema
  v6).
- tax_summary(start, end, form): the P&L grouped by category, book and
  deductible amounts (half away from zero to the cent), contra income
  (refunds) reducing receipts, and every account still uncategorized.
- MCP: books.tax_categories (filtered to the configured return),
  books.set_tax_category, a tax_summary report in every format and in
  the CPA package, chart output with categories, and a fifth
  tax_category column in chart CSV imports, validated before anything is
  created. [company] tax_form, or derived from tax_classification.

Scope stays book basis: no tax depreciation, basis, or filing.

Tests: a hand-computed quarter (50% meals 333.33 -> 166.67, penalties at
0%, refunds as negative receipts, guaranteed payments, one uncategorized
account; book net 5,276.67 vs tax 5,483.33); overrides; category/account
/return validation; form parsing and derivation; CSV parsing; stdio:
filtered catalog, mapping, refusal, summary, all-or-nothing import.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MtYEaR6M6Ybdhm6X98BWNu
2026-10-11 20:53:56 -07:00

4.1 KiB

Parity catalog

Every semantic feature we intend to clone, with its status. Updated in the same commit as the feature. The floor never decreases: the count of done items is monotonic across commits.

Statuses: done = implemented + invariant-tested + golden-covered. partial = implemented but missing tests or goldens. todo = not started. No other statuses.

Floor: 10 done (2026-10-10; fixed-asset register added).

Area GnuCash reference Status Notes
Chart of accounts (5 types, codes, hierarchy) Accounts tab done account.rs; placeholder support in
Double-entry validation (balanced, ≥2 lines) Journal validation done journal.rs::validate
Exact decimal money, no floats — (we go further) done money.rs; Currency ISO codes
Posted-entry immutability Read-only posted txns done reversal via reverse_entry
Trial balance Reports → Trial Balance done golden-covered
Balance sheet (A = L + E) Reports → Balance Sheet done current earnings folded in pre-close; golden-covered
Profit & loss Reports → Income Statement done golden-covered
P&L for a date range, line per account (closing entries excluded) Reports → Income Statement (custom dates) partial hand-verified fixture + property tests; no golden file yet
Balance sheet as of a date, line per account Reports → Balance Sheet (as of) partial hand-verified fixture + property tests; no golden file yet
General ledger by account (running balance, split) Reports → General Ledger partial hand-verified fixture, ties to trial balance; no golden file yet
Trial balance as of a date Reports → Trial Balance (as of) partial hand-verified fixture; no golden file yet
Statement of changes in members' equity Reports → Statement of Changes in Equity partial hand-verified two-member fixture incl. rounding and a close; no golden file yet
Tax line mapping + tax summary Accounts → Tax line mapping; Tax reports partial hand-verified fixture (50% meals, nondeductible, contra income); no golden file yet
Reversing entries Reverse transaction done linked via reversal_of
Canonical report snapshots (JSON) — (our oracle format) done reports::snapshot
Fixed-asset register + straight-line depreciation Fixed Asset register done assets.rs; golden-covered schedule; idempotent runs; disposal with gain/loss
Cash flow statement (indirect) Reports → Cash Flow done R-FUTURE-3
Period close / retained earnings Close books todo R-FUTURE-2
Foreign-currency lines (base + foreign stored) Multi-currency accts done R-FUTURE-1
Period close (closing entry to Retained Earnings) Close books done R-FUTURE-2
Bank reconciliation (cleared flags + report) Reconcile done —
QuickBooks CSV import (bank txns, chart of accounts) Banking → Upload done R-FUTURE-4
QuickBooks IIF + XLSX export Export / reports done R-FUTURE-4
A/R invoices + payments + aging Business → Invoices done R-FUTURE-5
A/P bills + payments + aging Business → Bills done R-FUTURE-5
Payroll runs (accounting only, no tax tables) + tax remittance Payroll done —
Tracking classes (divisional P&L) Class tracking done —
CPA handoff package (TB + GL xlsx, P&L + BS pdf, zip) Reports → export done —
Budgets Budgets todo R-FUTURE-6 (declined as bloat)
Scheduled transactions Scheduled txns todo R-FUTURE-6
Automated GnuCash diff harness — (our xtask oracle) todo roadmap phase 3

Workflow/UI parity (QuickBooks/Xero reference) gets its own catalog when the egui phase starts; semantics come first.

Capability parity (AI-first phase)

Semantic parity (above) is about correctness: the engine computes the right numbers. Capability parity is about usefulness: can the new system do everything the GSheet+GDrive system does today? Tracked separately in docs/capability-parity.md, with its own cutover rule (parallel run + Stephen's approval). The two catalogs converge: when both are green, the sheet retires.