Mietfux – Mietverwaltung für Vermieter

Mietfux ("Miet" = rent, "Fux" = fox) puts everything a private landlord in Germany needs for one or more flats into a single plugin. All data stays in your own WordPress database – no cloud service, no data transfer to third parties, no external scripts. The user interface is available in English, German, French, Spanish, Italian, Dutch, Polish and Portuguese. The generated legal documents (tenancy agreement, house rules, information sheets) are in German because they implement German tenancy law (BGB, BetrKV, HeizkostenV, EStG). Features

• Master data – properties, units (flat, garage, parking space), tenants with an optional spouse or partner as co-tenant, tenancies with additional units (flat + garage = one agreement, one total rent)
• Payments – due/paid per month, tick open items to book them, bank import (CSV / CAMT.053) with matching rules and duplicate detection
• Receipts – cost type, tax year, service period, file upload with camera support; spreading of maintenance costs over 2–5 years; labour share for tenants (§ 35a EStG)
• Service charge statement – per BetrKV with allocation by area, persons, units or consumption; heating per HeizkostenV; pro rata on tenant change; letter as PDF
• Tax reporting (Anlage V) – income, expenses by form line, depreciation, loan interest, prior-year comparison, CSV export
• Depreciation – statutory rate by year built, itemised acquisition costs, land share, purchase contract PDF parsed locally in the browser, 15 % guard
• Loans – repayment schedule, instalments to tick off, extra repayments, bank interest certificates
• Tenancy agreement – complete residential agreement with annexes: house rules, heating/ventilation leaflet, privacy notice, SEPA direct debit mandate, move-in/move-out handover protocol
• Deposit account (§ 551 BGB), dunning (three levels), rent increases (§ 558 / § 557b BGB)
• Owners’ association fee for condominiums: budget plan split by cost type, monthly bookings, annual statement adjustments, bank import recognition
• Recurring expenses (property tax, insurance …) with due-date plans and bank import recognition
• Email dispatch of statements, rent increases, deposit settlements and dunning letters with dispatch log
• Consumer price index for index-linked rents (manual, CSV or Destatis), activity log (GDPR accountability), automatic backups, two-factor integration, read-only tax advisor role
• Tenant portal via shortcode [mietfux_portal] – rent account, statements, released documents, damage reports, meter readings
• Data protection – deletion concept with retention periods, anonymisation, Art. 15 GDPR access report
• Setup wizard, in-app help, focus mode, backup/restore as JSON, clean uninstall

The plugin does not replace legal or tax advice. Contract templates and calculations are based on German law as of 2026 and must be checked before use. Deutsch Mietverwaltung für private Vermieter: Stammdaten, Zahlungen, Belege, Betriebskostenabrechnung nach BetrKV, Steuer (Anlage V), AfA, Darlehen, Mietvertrag mit allen Anlagen, Kaution, Mahnwesen, Mieterhöhung, Mieterportal und Datenschutz-Löschkonzept in einem Plugin. Alle Daten bleiben in der eigenen WordPress-Datenbank. Einrichtungsassistent und Hilfe sind im Backend enthalten.

1.2.0

• Recurring expenses: due-date plans (monthly/quarterly/half-yearly/yearly) for property tax, insurance, chimney sweep etc.; tick and book, bank import recognises the supplier
• Activity log: who created, changed, deleted or anonymised which record (only changed fields, IBAN masked, IP anonymised), filters, CSV export, retention period
• Email dispatch of letters to tenants (service charge statement, rent increase, deposit settlement, dunning) with PDF attachment, copy to landlord, signature and dispatch log
• Consumer price index (CPI): monthly values (manual, CSV or Destatis GENESIS), overview of index-linked tenancies with possible adjustment, pre-filled rent increase
• Automatic backups (daily/weekly via WP-Cron, rotated, optional by email) with download list
• Two-factor authentication: detection and recommendation of the "Two-Factor" plugin, optional enforcement for landlords
• Role "Tax advisor (read-only)": access to Anlage V, receipt list and CSV only
• Demo data on empty installations and a Playground blueprint for the live preview
• Fixes: rent increase letter link from history, service charge letter via admin-post

1.1.1

• "Version & updates" section in Settings: check for updates on demand and update with one click; notice on the overview when a new version is available

1.1.0

• New module "Owners’ association fee" (Hausgeld) for condominiums: budget plan per property with split by cost type, monthly bookings create one receipt per cost type (recoverable → service charge statement, management/maintenance → Anlage V, maintenance reserve recorded but not deducted), annual statement books the differences as adjustment receipts
• Bank import recognises fee payments by the manager’s IBAN or name and books them directly
• Notices for unbooked fee months; new cost type and tax group "Maintenance reserve contribution (not deductible)"

1.0.4

• New interface languages: French, Spanish, Italian, Dutch, Polish, Portuguese (bundled)
• Remaining hard-coded German interface strings made translatable; last inline event handlers moved to admin.js

1.0.3

• Source language switched to English (WordPress.org convention); the complete German translation is bundled as de_DE and loaded via load_plugin_textdomain(), so German sites look exactly as before
• Plugin description in English

1.0.2

• Security review round 2: every request-driven action is now guarded by a nonce check before any input is read (admin forms, admin-post endpoints, tenant portal); the tenant portal statement link carries a nonce and can no longer trigger document storage
• Late escaping everywhere: generated HTML fragments go through wp_kses()/wp_kses_post(), attributes through esc_attr(); all phpcs:ignore markers for output escaping removed (except the binary PDF stream)
• Status notices use short-lived transients instead of ?msg= URL parameters
• Remaining inline event handlers (confirm dialogs, select-all checkboxes, print buttons) moved into admin.js/dokument.js

1.0.1

• Renamed to Mietfux (slug mietfux, text domain mietfux); the shortcode [mietverwaltung_portal] keeps working as an alias
• All CSS/JS now enqueued via the WordPress API (portal, print views, focus mode); translation files removed from the package in favour of translate.wordpress.org
• Fixed: admin-post actions for PDF/CSV/backup after the prefix change; CSV export and bank CSV import enclosure character

1.0.0

• New admin layout: page header with icon, cards, dashboard with key figures, quick actions and notices on the overview, consistent tables and forms
• Fixed: entity pages were blank after the prefix change; placeholder order in several generated letters; fallback selection on deposit, rent increase and loan pages

0.9.9

• Setup wizard (five steps from landlord to first tenancy)
• WordPress Coding Standards: full PHPCS compliance, prefix changed to mietv_ (existing installations are migrated automatically)
• pdf.js bundled locally instead of loaded from a CDN
• Fixed placeholder order in the index-linked rent notice

0.9.8

• Help page and contextual help in the admin area
• Complete English translation

0.9.7

• Spouse/partner as optional co-tenant – automatically included in agreement, letters, SEPA mandate and handover protocol

0.9.6

• Structured admin menu with groups and icons

0.9.5

• Tenancy agreement extended to 20 sections, rent cap exceptions, § 554 BGB, heating/ventilation leaflet

0.9.0 – 0.9.4

• Additional units per tenancy, tick open items, loan account, depreciation fix, itemised acquisition costs Full changelog (German): https://github.com/sporcherla/mietverwaltung/blob/main/CHANGELOG.md