• Invoices & quotes in seconds from service building blocks

• Discount templates (e.g. "regular customer discount 10%") selectable via dropdown

• Professional PDFs incl. logo, bank details, small business notice

• Direct email dispatch with your own SMTP access — sender addresses freely selectable per dispatch type (invoice@, quote@, …)

• Quote → Invoice with one click (snapshot of line items)

• Recurring invoices (monthly, quarterly, yearly)

• Cancellation invoices GoBD-compliant (reversal entry, no deletion)

• Multiple tax rates (7% / 19%), discounts and cash discount

• 1st & 2nd stage reminders sent with one click

• Record incoming payments — including partial payments

• Create proof of work, or service reports, have them signed digitally on-site via smartphone or tablet if needed, and attach them to the invoice

• XRechnung 3.0 (UBL) — KoSIT-validated, 0 errors / 0 warnings

• ZUGFeRD 2.1 / Factur-X — PDF with embedded XML

• Incoming XRechnung/ZUGFeRD PDFs can be filed as incoming documents

• EÜR (income surplus statement) with VAT breakdown per month

• VAT advance return — monthly or quarterly

• ELSTER values modal with all official codes (KZ 81/86/66/83) for entering into Mein ELSTER

• Input tax detail report — document-precise listing per period

• DATEV export format 510 (booking batch) — either SKR03 or SKR04

• Upload documents and match them automatically

• Freely adjustable small business threshold (€22,000/€25,000 or your own safety buffer)

• Manage mandates per customer — including audit-proof PDF filing (GoBD)

• Mandate template as PDF — pre-filled, simply send to customers for signing

• pain.008.001.02 XML for batch direct debits — upload directly in online banking

• Automatic sequence detection (FRST → RCUR → FNAL)

• Pre-notification via email can be sent automatically (template editable)

• Upload CSV statements from any German bank (Sparkasse, DKB, ING, …)

• Auto-match incoming payments to open invoices via reference + amount

• Create outgoing bookings as documents — with duplicate detection

• CSV stays only in memory — nothing is stored permanently

• Seamless GoBD log — immutable audit trail

• Locked invoices — no subsequent changes after issuing

• Sequential invoice numbers — assigned atomically, no number gaps

• 10-year archiving — retained in compliance with the law

• Small business mode with one click

• Automatically enforces 0% VAT on all items — no billing errors possible

• Mandatory notice under § 19 UStG is inserted automatically

• Also correctly noted in the XRechnung XML

• Art. 20 (data portability): ZIP export with JSON + PDFs + XMLs

• Art. 17 (erasure): anonymization after retention period

• DPA, TOMs, privacy policy available as templates for download

• Hosting in Germany, TLS 1.2+, AES-256-GCM for SMTP, bcrypt for passwords

• Own customer management incl. VAT ID, routing ID (Leitweg-ID), document storage

• Soft delete: accidentally deleted data can be restored

• Recurring invoices + payment term logic per customer

• Own SMTP credentials per company

• SSO login via Mein.BauKastl — one password for all modules

• Freelancers (IT, graphic design, consulting, coaching, trades)

• Small business owners under § 19 UStG (small business regulation)

• Small GmbHs and sole proprietorships with standard taxation

• Anyone who wants to provide their tax advisor with a clean DATEV export

• Anyone with B2B customers who must send e-invoices starting in 2025

• Anyone who wants to sleep soundly during a tax audit

• Corporations with SAP integration

• Shops with 1000+ invoices per month

• International revenue outside the EU

€9.90 /month

Completely sufficient for many self-employed individuals and small businesses.

• Invoices, quotes, dunning — unlimited

• Customer and service module management

• ZUGFeRD 2.1 + XRechnung 3.0 (meets 2025 B2B requirement)

• EÜR + small business forecast

• GoBD audit log + GDPR export

• Email sending via your own SMTP access

• Your own subdomain {yourname}.rechnungs.baukastl.de

• Hosting and backup in Germany

+€4.90 /month

• DATEV-510 posting batch (SKR03/04)

• VAT advance return + ELSTER values

• Input tax detail report

+€2.90 /month

• SEPA mandates (pain.008)

• Bank CSV import

• Automatic payment reconciliation

+€2.90 /month

• Recurring invoices

• Early payment discount notices on invoices

• Reusable discount templates

+€2.90 /month

• Top customers / top services

• Drill-down detail views

• Click-precise breakdowns

€18.90 /month

€4.60 cheaper than all modules individually (otherwise €23.50).

• Basic + all 4 additional modules

• Full DATEV/ELSTER tax advisor bridge

• SEPA direct debits + bank reconciliation

• Recurring invoices + discount templates

• Advanced reports with click-detail

• Cancellable monthly — no minimum term

Payment by invoice (annually €189) or SEPA direct debit monthly.