Add the building, enter the invoices – done. Nebio splits a year of operating, heating and CO₂ costs across your tenants and turns them into a finished letter as a PDF – with the balance due or in credit and the complete calculation to check. Tenant changes and vacancies count to the exact day, heating costs follow the German Heating Costs Ordinance and CO₂ costs the statutory ten-step model. Built for private landlords with one house or a handful of flats. No account, no server – your tenants’ data stays on your device.

Features

Cost types under the German Operating Costs Ordinance – the legal basis appears on every line of the PDF

Allocation by floor area, occupants, units or metered consumption – or enter amounts per tenant directly

Tenant changes and vacancies to the exact day: everyone pays only for their own period, the landlord carries the vacancy

Advance payments calculated from the monthly rate, partial months by the day – or enter the amounts actually paid

Heating costs under the Heating Costs Ordinance: 50 to 70 % by consumption, the rest by floor area

Hot water separated from a combined heating system under § 9 HeizkostenV – by heat meter, water volume or floor area

Tenant change without an interim reading: split by degree day figures under § 9b HeizkostenV

CO₂ costs under the ten-step model of the CO2KostAufG – with the landlord share and each flat’s share

Warnings before it gets expensive: missing consumption readings, missing CO₂ certificate, overlaps, periods longer than twelve months

Deadline reminders 90, 30 and 7 days before the twelve-month deadline under § 556(3) BGB expires

A receipt photo for every invoice – everything is to hand when a tenant asks to inspect them

Next year in one tap: carry over the cost items and allocation keys from the previous statement

Nebio Pro€39.99 / year · or €89.99 one-time

Entering data, calculating, the watermarked PDF preview, the CSV export and the backup are free forever. To send the statement to your tenants you either unlock a single accounting year for €19.99 or take Nebio Pro for all buildings and years.

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Your tenants’ data does not belong on the internet. Buildings, tenancies, costs and receipt photos stay on your device and are backed up to your own cloud – iCloud on iPhone, the Google backup on Android. No account, no server, no ads, no tracking.

Nebio is a calculation aid under the German Operating Costs Ordinance, Heating Costs Ordinance and Carbon Dioxide Cost Allocation Act and is no substitute for legal advice. Check your statement and the terms of your tenancy agreement before sending it. The app is designed for Germany and available in the German stores only. The iOS version is coming soon to the App Store.