When does letting become a trade? A practical BFH checklist for 2–10‑flat portfolios

Overview — why this matters for small portfolios

Gewerbesteuer (trade tax) applies only if a business activity qualifies as a Gewerbebetrieb. For many small landlords the decisive question is not whether they own flats, but whether their letting activity crosses the line from private asset management into a trade. The legal test comes from the Gewerbesteuergesetz (GewStG) and decades of Bundesfinanzhof (BFH) case law. Investors with 2–10 flats should watch activity, organisation and ancillary services closely because reclassification can trigger municipal trade tax, filing obligations and retrospective adjustments.

The starting legal points (statutes and thresholds)

The statutory starting point is § 2 GewStG (definition of a Gewerbebetrieb) and the rules on Kürzungen in § 9 GewStG. § 9 provides that companies that exclusively manage their own real estate (or predominantly do so) may reduce the Gewerbeertrag by the part attributable to property management — but only if certain conditions are met. Two numeric thresholds in § 9 are important for landlords: income from electricity/charging stations from renewable generation or charging may not exceed 20 % of rental income to remain non‑harmful, and other direct tenant services must not exceed 5 % of rental income in the year. Also, the law excludes the Kürzung when the property serves the trade of a shareholder or when recent transfers or hidden reserves generate gains. (See GewStG, § 2 and § 9.).

Five BFH indicators that push letting into a trade — checklist

1) Active value‑enhancing activity: If you systematically increase marketability (parceling, intensive refurbishment with resale in mind) the BFH treats this as commercial activity (cf. BFH case law on Grundstückshandel and active Umschichtung). (BFH decisions cited below).

2) Hotel‑ or service‑level letting: Regular, hotel‑style services (daily cleaning, reception, tenant rotation services) are classic indicators of a trade rather than passive letting (BFH decisions require an object‑specific assessment).

3) Scale and organisation: Frequent lettings, centralised commercial administration, employees dedicated to letting or advertising beyond what is typical for residential property point to Gewerblichkeit.

4) Mixed activities or ancillary trading: If non‑rental revenues (e.g. commercial leases, significant electricity sales to third parties) exceed the § 9 thresholds, the Kürzung may be lost and Gewerbesteuer may apply.

5) Short holding periods and systematic turnover: Repeated acquisitions and disposals, or a business model relying on resales within a few years, invoke the BFH's „Drei‑Objekt‑Grenze“ and related reasoning that distinguishes private management from a trade.

Practical thresholds for 2–10 flats — what to watch for

Owning 2–10 flats is not by itself decisive. What matters is activity around those flats. Red flags for this size range are: (a) systematic refurbishment projects where you market‑grade multiple flats and advertise for sale rather than long‑term letting; (b) providing regular ancillary services beyond basic landlord duties; (c) booking rental income and non‑rental income together instead of separately (the law requires separate accounting if you rely on the § 9 Kürzung); and (d) evidence that the flats serve an operating trade of a related shareholder. If one or more of those apply, expect a focused BFH‑style enquiry.

How to avoid surprise reclassification — a short practical to‑do list

1) Keep clear accounting: separate rental profit from any ancillary or trading revenue; document the percentage shares (electricity/charging vs. rental; tenant services) to demonstrate compliance with § 9 thresholds.

2) Limit hotel‑style services and third‑party catering. Offer optional paid services only via separate contracts with arms‑length providers.

3) Resist routine rapid resale within a short horizon. If you plan to sell upgraded units, document original intent and timelines.

4) For corporate structures: understand § 9 exclusions (e.g. when property serves a shareholder's trade) and the need for a separate Gewinnermittlung for the property business.

5) Get an early tax ruling or a specialist opinion if your model uses mixed activities — the BFH test is facts‑based and retrospective risk is real.

When to call a specialist

If your activities include regular refurbishment for resale, hotel‑style services, significant non‑rental income, or if properties serve a corporate shareholder, consult a German tax lawyer or Steuerberater before filing. The BFH applies a holistic, facts‑based test; only a local specialist can assess how the case law maps to your facts and can advise on filing of Gewerbesteuermessbescheide or requests for an official ruling.