Product
Your myDATA invoices, income and tax estimates in one private, self-hosted view.
As a Greek freelancer, your invoices live in the AADE myDATA portal, your money lives in your bank, and VAT, income tax and EFKA contributions are worked out somewhere else again. Knowing what you earned, what you pay and what is actually free to spend means stitching those pieces together by hand. I am a freelancer myself, and I built GFF for my own work first: to manage my invoices, see what I pay and how, and check that my accountant entered everything correctly.
Greek Freelancer Finance (GFF) reads the invoices you issue and receive straight from AADE myDATA and turns them into one view of income, expenses, VAT, income tax and cash flow, with the Greek rules built in. You do not type invoices in. You see your position for any period, plan the months ahead, and hand your accountant a clean export. Tax and VAT figures are estimates to plan with, not a replacement for your accountant.
Sign in on the web or in the Android app.
Press sync to pull your issued and received documents from AADE myDATA into the app.
Open the finance overview to see income, expenses, VAT and your estimated income tax for a period, and open any invoice for its details.
Check upcoming tax deadlines, Safe-to-Spend and the cash-flow plan to decide what to set aside.
Export an Excel or PDF file for your accountant.
The main dashboard has tabs for overview, invoices, VAT, tax, assets and classification codes, with a period selector and a drawer for each invoice. The ledger decides income or expense by document type, leaves out cancelled invoices, handles credit notes and withholding, and only counts input VAT that is classified.
See VAT per period with a what-if calculator. The tax view projects your net income for the year, applies the progressive income tax brackets, your EFKA tier and the advance tax, and suggests a monthly amount to set aside. Tax rules for 2024 to 2026 are built in, including the 2026 relief rules of Law 5246/2025. Every figure is an estimate to plan with.
Plan 3, 6 or 12 months ahead. Income, VAT, EFKA, loans and your own items become dated entries. You can switch off, shift or stop any automatic series, and skip, move or change a single entry. Safe-to-Spend estimates your available money after upcoming recurring costs and the tax set-aside, next to the next VAT and EFKA due dates.
GFF is connected to the production AADE myDATA API, so it works with your real documents. A sync pulls the documents you transmitted (income) and received (expenses) into a local copy, together with their classifications. Each document is stored once by its MARK, so syncing again does not create duplicates, and every run is logged. Sync is started with a button, not on a schedule.
Export the invoices of a chosen period, with a summary of their classifications, as Excel or PDF, or as CSV. The same export is available from the phone, which makes it easy to compare your records with what your accountant has entered.
A native Android companion on the same account: dashboard and reports, transactions, accounts, myDATA status and sync, taxes and deadlines, recurring costs and loans, fixed assets and settings. The app opens behind a fingerprint or device lock prompt and connects only through the public HTTPS address. It keeps your login details encrypted on the phone itself, so signing in again is quick. It is built as an APK for my own phone and is not on Google Play.
A Python FastAPI backend with PostgreSQL holds the myDATA copy, the ledger engine and the tax and planning logic. A Next.js and React front end shows the dashboards in Greek, with self-hosted fonts and a light and dark theme that works on mobile. The Android app is native Kotlin with Jetpack Compose, built as separate modules for each screen, with Greek and English text. Everything runs in Docker Compose on one server.
Built with AI agents, reviewed by a security professional. I used both local models and third party AI agents to write, integrate and iterate much faster than I could alone. I set the requirements, review the result and own the security. That is why I build: if a job takes 100 hours, and an app that takes 130 hours to build brings that job down to 10, I build the app, because every time after that costs only 10 hours. Building GFF is also how I learn new technologies and show, in real practice, that a small builder can ship a secure app.
Stack
Live
Live at freelancer.tsakmak.com, for my own use. The web app and the Android app are both at version 0.1.0. myDATA sync is manual, and the tax rules are updated by hand for each new year. GFF is not for sale and has no subscription; there are no accounts for other people today.
Planned:
see invoices, income, VAT and an estimate of the tax to set aside, without entering anything by hand.
see which months are tight before they arrive, with tax and EFKA payments already on the calendar.
see every myDATA document of a period, check that your accountant entered everything correctly, and hand over a clean Excel or PDF.
once the code and guide are published, run your own copy with no tracking and a locked phone companion.
A self-hosted web and Android app for Greek freelancers that reads AADE myDATA invoices and shows income, VAT, tax estimates and cash flow in one place.
Still under construction
The Tsakmak brand and this website are still being built, so some pages and details are not final yet. Thank you for your patience.