A = L + E
The balance sheet proves it every time — assets equal liabilities plus equity plus result.
In-house ERP · GL · AR · AP · Inventory · Orders
The books,
always balanced.
WizERP is an AI-native ERP that replaces Sage 200 — an immutable double-entry ledger, real-time inventory and orders, and an AI auditor that reviews the numbers before you post. Runs on your servers, not per-seat SaaS.
Every posted journal is balanced or rejected — correctness is guaranteed in code, never left to the model.
JOURNAL 000482 · 31 Aug 2026
Balanced
| Account | Debit | Credit |
|---|---|---|
| 1210 · Bank | 1,150.00 | — |
| 4100 · Sales | — | 1,000.00 |
| 2120 · VAT | — | 150.00 |
| Total | 1,150.00 | 1,150.00 |
Immutable — corrections post as reversing journals, never edits.
One system, whole business
Every ledger you run, under one roof
GL, subledgers, inventory, orders and fixed assets — each posts through the same audited engine, so the numbers reconcile by construction.
GL
General Ledger
Immutable double-entry journals, fiscal periods, multi-currency FX, reversing.
CB
Cash Book & Bank
Receipts, payments, transfers and a reconciliation worksheet that ties to statement.
AR
Accounts Receivable
Customers, invoices, receipts and open-item allocation with credit limits.
AP
Accounts Payable
Suppliers, bills, payments and settlement discounts through the control seam.
STK
Inventory & Valuation
Weighted-average stock ledger, exact to the cent, tied to the Inventory GL.
SO/PO
Sales & Purchase Orders
Deliver↔invoice, receive↔bill, back-orders and the GRNI accrual.
FA
Fixed Assets
Register, straight-line depreciation runs and disposal with gain/loss.
RPT
Reporting & VAT
Trial balance, P&L, Balance Sheet, Cash Flow and a period VAT return.
4 dp
Exact integer money math to four decimal places. No floating-point drift, ever.
On prem
Your PostgreSQL, your Ollama. Multi-tenant, schema-isolated, data stays in-house.
Why WizERP
Built for people who take the numbers seriously
01
Correct by construction
An append-only ledger where balances are derived, not stored. Posted journals can't be edited or deleted — corrections are reversing entries with full provenance. The books can't silently drift.
02
AI that asks permission
A two-tier auditor: deterministic guardrails guarantee the ledger and never call the model; the AI reviews are advisory, human-gated and labelled. Financial correctness never depends on an LLM.
03
Yours, on your terms
An installable PWA over an on-prem Postgres and a self-hosted model. No per-seat licence, no data leaving the building — a real alternative to renting your own accounts back from a vendor.
How it's built
The discipline is in the engine, not the paperwork
The same principles auditors look for, enforced automatically on every post — so month-end is a report, not a reconstruction.
balanced=rejected Debits equal credits or the post fails
snapshot Price, tax & account frozen at posting
control seam Subledgers own their control accounts
stock⇄GL Inventory value ties to the ledger to the cent
GRNI→0 Goods-received accrual nets to zero once billed
expand→contract Migrations never touch live data destructively
Own your books.
Bring your Sage 200 trial balance, customers, suppliers and stock across in an afternoon — then run the whole business on a ledger you control.