Setting up
What to trade as, which registrations, in what order, and which one blocks which. Done once, then finished.
Longtom holds your country's thresholds, deadlines and authorities — it does not ask a model to guess them.
Longtom keeps the shop
while you build the product.
A company to register, a return to file, a receipt to book, a customer waiting on a reply. None of it is why you started. Longtom runs on your machine and does that half.
Not released yet In development. Nothing to download today.
Three things
Bookkeeping
Bank statements in, receipts read out of your mail, rules learned as you categorise, a trial balance out, and the return prepared in the authority's own labels.
It prepares filings. It never lodges one — that is a statement you make, under your identity, at a government portal.
Support
A customer writes in. The message is classified, attached to whoever sent it, reproduced against your repository, and a fix comes back as a branch with a reply drafted beside it.
The patch lands in a temporary worktree. Your own checkout is never touched.
It uses the AI you already pay for
No model of its own, no API key wanted. It runs the coding CLI already on your machine — Claude Code, Codex, Cursor, Gemini, Aider or your own command — under your own subscription.
Most of it never asks a model
Rates, deadlines, fees and the order of the steps are compiled in, each with the date it was last checked against a primary source. Looking a fact up once costs one search; leaving it to a model costs one per user, every time.
The model is for what needs one: reading documents, reconciling a feed, drafting a reply.
Nothing leaves your machine
One folder holds the database, the documents and the backups. Secrets sit in a separate encrypted vault the database never sees. No account, no server keeping your books.
Zero runtime dependencies. Not few — none.
77 countries, each one actually known
Listing a country is a claim: the tax and its rate, the registration threshold, the return's name and its real due dates, which authority issues what, and the privacy law. Anything less is not offered.
Albania TVSH (VAT)
Argentina IVA (Impuesto al Valor Agregado)
Armenia ԱԱՀ (VAT)
Australia GST
Austria USt
Bangladesh VAT (মূল্য সংযোজন কর)
Belgium BTW / TVA
Brazil
Bulgaria ДДС (DDS, value added tax)
Canada GST/HST
Chile IVA (Impuesto al Valor Agregado)
Colombia IVA (Impuesto sobre las Ventas)
Costa Rica IVA (value added tax)
Croatia PDV (porez na dodanu vrijednost)
Cyprus ΦΠΑ (VAT)
Czechia DPH
Denmark moms
Egypt VAT (ضريبة القيمة المضافة)
Estonia VAT
Finland ALV
France VAT
Georgia დღგ (VAT)
Germany VAT
Ghana VAT (Value Added Tax)
Greece ΦΠΑ (FPA, value added tax)
Hong Kong
Hungary ÁFA (általános forgalmi adó)
Iceland VSK (virðisaukaskattur)
India GST (Goods and Services Tax)
Indonesia PPN (Pajak Pertambahan Nilai)
Ireland VAT
Isle of Man VAT (value added tax)
Israel מע"מ (ma'am, value added tax)
Italy IVA
Japan consumption tax
Jersey GST (goods and services tax)
Kazakhstan ҚҚС / НДС (VAT)
Kenya VAT (Value Added Tax)
Latvia PVN (pievienotās vērtības nodoklis)
Lithuania PVM (pridėtinės vertės mokestis)
Luxembourg TVA (taxe sur la valeur ajoutée)
Malaysia SST (Sales and Service Tax)
Malta VAT (Value Added Tax)
Mexico IVA (Impuesto al Valor Agregado)
Moldova TVA (VAT)
Morocco TVA (value added tax)
Netherlands VAT
New Zealand GST
Nigeria VAT (Value Added Tax)
Norway MVA
Pakistan
Peru IGV (Impuesto General a las Ventas)
Philippines VAT (Value Added Tax)
Poland VAT
Portugal IVA
Romania TVA (taxa pe valoarea adăugată)
Rwanda VAT (value added tax)
Saudi Arabia VAT (ضريبة القيمة المضافة)
Serbia PDV (porez na dodatu vrednost)
Singapore GST
Slovakia DPH (daň z pridanej hodnoty)
Slovenia DDV (davek na dodano vrednost)
South Africa VAT
South Korea 부가가치세 (value added tax)
Spain IVA
Sri Lanka VAT (value added tax)
Sweden moms
Switzerland MWST / TVA
Taiwan 營業稅 (business tax)
Thailand VAT (ภาษีมูลค่าเพิ่ม)
Türkiye KDV (Katma Değer Vergisi)
Ukraine ПДВ (VAT)
United Arab Emirates VAT
United Kingdom VAT
United States
Uruguay IVA (VAT)
Vietnam Thuế GTGT (value added tax)
Where no tax is named, the country levies none, levies it state by state, or is mid-transition — the profile says which.
The ones missing are a to-do list. Country data updates on its own, so a rate that moves does not wait for a new version.
Where it stops
Never payroll. Never an accounting package. Never multi-user.
Longtom is for a business of one. That is the whole product, not a stage on the way to something bigger.
Leaving is designed
Outgrow it and you move to your country's usual accounting package. The ledger exports OFX, and each country profile names the packages an accountant there will accept.
The records pack is one zip an accountant or a tax office can read.
Not out yet
When there is something to install, it will be here.