Lithuania: set up open source accounting

The same path as text: every command with Lietuva already on it, and the codes a first invoice is written with. An AI agent helping you reads the same text as Markdown, at /countries/lt/set-up.md.

Ekwo OS is open source software for keeping double-entry books in a database you own. This page is generated from the Lietuva pack, version 0.1.0; every code on it is read from the pack.

The Lietuva pack is community: contributed, and reviewed by nobody.

Ekwo is software, not an accountant and not tax advice: a pack is a reading of the rules at the date of its version, and it can be wrong for your situation. Have a qualified professional in Lietuva check your set-up and your first declarations. See what Ekwo is, and what it is not.

1. What you need

A Supabase project of your own. The free plan is enough to start; Ekwo does not create it, pay for it or have access to it.
From its dashboard: the connection string (Connect → Session pooler), the Project URL and the service_role key (Project Settings → API). The key is used once, to create your first administrator, and is written nowhere. The anon (publishable) key, on the same page, is what you sign in with afterwards.
Node 20 or later on your machine. Nothing else: no Supabase CLI, no Docker, no clone.

2. Install

One command. It asks for the rest as it goes.

npx ekwo-os init --country LT

One chart of accounts: Sąskaitų planas pagal AVNT pavyzdinio plano klasių struktūrą, 102 accounts.
The books are kept in lt.
The PVM deklaracija (forma FR0600) is filed on one of these cadences: month, quarter, half_year. Pass --vat-period <cadence> to set yours.
A financial year follows the calendar unless you pass --fiscal-year-start YYYY-MM-DD.

The same, with no question asked — every value your own:

npx ekwo-os init \
  --country LT \
  --vat-period <month|quarter|half_year> \
  --db-url "postgresql://postgres.<ref>:<password>@<pooler host>:5432/postgres" \
  --supabase-url "https://<ref>.supabase.co" \
  --service-role-key "$SUPABASE_SERVICE_ROLE_KEY" \
  --org "Your Organisation" --company "Your Company" \
  --admin-email "you@example.com" \
  --yes

3. Before you go live

Four settings of your project no installer can reach: turn off self sign-up, keep two administrators, keep the service_role key off every other machine, and read the disclaimer. init prints them; the installation guide explains each.

4. A first invoice

Sign in as the administrator you just created, pick the company, and write a draft. --dry-run shows the entry the database would write, and writes nothing; post books it.

ekwo login --supabase-url https://<ref>.supabase.co --anon-key <publishable key> --email you@example.com
ekwo use "Your Company"
ekwo contact add "First Customer" --country LT --ref customer-1
ekwo doc new --contact "First Customer" --ref invoice-1 --line "name=Consulting,price=1000.00,account=5000,tax=LT-S-21"
ekwo post invoice-1 --dry-run
ekwo post invoice-1

A line names its account and its tax by code, never by rate. 5000 is the account the pack names for sales; the chart may carry a closer one for what you sell — services, a reduced rate — and list_accounts lists them.

What the invoice says about your company — its address, its VAT number — comes from the company’s profile, which the MCP tool update_company_profile fills; ekwo init sets only the name.

The domestic sale taxes the pack carries today. Which one a sale carries is a question about that sale, for you or your accountant: the list is the pack’s, not advice.

Tax code	Name	Rate
`LT-S-21`	Pardavimas 21%	21 %
`LT-S-12`	Pardavimas 12%	12 %
`LT-S-05`	Pardavimas 5%	5 %

5. With an AI agent

The MCP server lets an agent keep the books as you, under your own row level security, and never with the service_role key. Configuring it, and what an agent must and must not do.

What the Lietuva pack carries

Charts of accounts: Sąskaitų planas pagal AVNT pavyzdinio plano klasių struktūrą (102).
20 taxes, at 0 %, 5 %, 9 %, 12 %, 21 %.
The PVM deklaracija (forma FR0600) (LT-FR0600), 27 boxes, filed month, quarter, half_year.
Electronic invoices as peppol-bis-3.
Financial statements: Balansas, Pelno (nuostolių) ataskaita, 1-oji schema (pagal sąnaudų pobūdį).

What it does not do

No library of this repository writes the file of the LT-FR0600 yet: the return is computed and frozen here, and typed on the administration’s portal.
Nothing is sent to an administration, a Peppol network or a bank by the open source software: transmission is yours, or an operator’s you appoint.
What the pack leaves out on purpose is in its README.

Set up Ekwo for Lietuva

Run it yourself

Create your Ekwo Cloud account

Step by step