10 invoicing questions, answered

A professional invoice needs your business data, a clear line for each service or product, the right tax treatment and a payment method. InvoYX gives you templates with your company details, a ZUGFeRD 2.2 / Factur-X e-invoice PDF, and a SEPA QR code for payment — so every invoice you send looks clean and is legally machine-readable.

Open InvoYX on your phone, pick a customer, add the work you did and the price, and send the PDF. It works fully offline — the invoice is stored in a local SQLite database — so you can write it in a cellar or on a roof with no signal and send it the moment you are back online.

InvoYX has a dedicated offers workflow: create an offer, send it as a PDF, and when the customer accepts it you convert it into an invoice with one tap. You keep quotes, credit notes (Gutschrift), vouchers and refunds in the same app, so nothing is copied twice.

InvoYX generates ZUGFeRD 2.2 / Factur-X PDFs by default — a normal PDF that also carries the structured invoice data inside. Your customer opens the PDF, and their accounting software (or the tax office) reads the data automatically. No separate e-invoice portal needed.

InvoYX exports all your invoices as a 42-field DATEV CSV booking batch. Export the period, hand it to your tax advisor, and they import it straight into DATEV — no re-typing of your invoices.

InvoYX has built-in 3-stage dunning with configurable fees. Mark an invoice overdue, and the app drafts the reminder with the right fee and wording for each stage, ready to send as a PDF.

InvoYX lets you set the document language independently of the app language. Work the app in Arabic or Turkish, and send the invoice to your customer in German — 28 languages are available for the document text.

Create the invoice once and set a repeat interval. InvoYX regenerates it each period so you can send it again with the updated date and number — ideal for maintenance contracts or monthly retainers.

InvoYX has an expenses ledger where you log costs with photos and receipts. Expenses stay attached to the job so you know exactly what a project really earned.

InvoYX keeps everything on your device in a local SQLite database — no account, no cloud. You can back up with AES-256 encryption and lock the app with a PIN, so customer names and prices never leave your phone.