Sign a rental agreement digitally in Germany

Often only a few days pass between the viewing and moving in, and in popular locations speed is what decides: whoever sends back the signed lease first gets the apartment. Property managers and landlords who have their leases signed digitally cut this process from days to minutes. The law allows it, with a few special points you should know.

Leases have no form requirement: the key point first

A lease (rental agreement, in German: Mietvertrag) is formed even verbally or with a handshake. The law does not prescribe any form for residential leases. This means you can generally conclude a lease with any electronic signature, from the simple to the qualified level.

So why does everyone still sign on paper? Habit, and a misunderstanding about § 550 BGB (German Civil Code). Let’s take a closer look.

The § 550 BGB issue: long-term leases and the written form

§ 550 BGB states: if a lease for a term longer than one year is not concluded in written form, it is deemed to have been concluded for an indefinite period. Today, this mainly affects fixed-term residential leases, that is, leases for apartments with a fixed term of more than one year.

The legal consequence is what matters: the contract is not invalid. It is merely treated as open-ended and can therefore be terminated with ordinary notice under the statutory notice periods. For most residential leases, this is not critical, because open-ended contracts are the standard there anyway. But if you deliberately agree on a fixed term, you lose it without the written form.

The good news: under § 126a BGB, the written form of § 550 BGB can be replaced by the qualified electronic signature. If you want to conclude fixed-term residential leases of more than one year digitally, choose the QES and you are on the safe side.

Commercial leases have been easier since January 1, 2025: under § 578 (1) BGB, as amended by the Fourth Bureaucracy Relief Act (Viertes Bürokratieentlastungsgesetz), text form (§ 126b BGB) is enough for commercial leases with a term of more than one year. This means the simple and the advanced electronic signature are enough to secure the fixed term. A QES is no longer needed for this.

Recommendations by contract type

• Residential lease (open-ended): No form requirement; the advanced signature (AES) with SMS code is a solid choice. It links the signature uniquely to the signer and provides reliable evidence.
• Fixed-term residential lease of more than one year: Use the QES to preserve the written form under § 550 BGB and secure the fixed term.
• Commercial lease with a term of more than one year: Since 2025, text form is enough (§ 578 (1) BGB). SES or AES will do; a QES is not needed.
• Handover reports: The simple signature (SES) is enough. Even better: have the report signed on the tablet right at the handover; more on that in a moment.
• Lease termination agreements and addenda: Treat them like the main contract. For addenda to fixed-term residential leases of more than one year, keep § 550 BGB and the QES in mind again. For addenda to commercial leases, text form is likewise enough.
• Tenant self-disclosure and applicant forms: SES is entirely sufficient; this is about documentation, not form requirements.

Our overview of signature levels offers a detailed decision guide.

The classic in practice: the handover report on a tablet

Hardly any property management document is created as much on the spot as the handover report: meter readings, defects, number of keys, everything is recorded on site, and then there is no printer. With in-person signing, tenants and property managers sign the report directly on the tablet. Identity has just been verified in person anyway, SmartDocs notes exactly that in the audit trail, and the finished document can be emailed or printed immediately.

Evidence: what happens in a dispute?

Tenancies end up in court more often than most other contractual relationships, from utility cost statements to the security deposit. Then what counts is what you can prove. A digitally concluded contract has an underrated advantage over the paper binder here: the entire signing process is logged.

SmartDocs creates a cryptographically chained sequence of events for every signature request: when the contract was sent, when it was opened, and who signed it with which level. The completion certificate brings together all the evidence. Our page on legal validity explains how this evidence is assessed legally.

Objections from practice, briefly answered

“My tenants are not digital enough.” Signers need neither an account nor an app, just the link from the email. Anyone without an email inbox signs on site on your tablet.

“What about my property management software?” SmartDocs can be connected via the REST API, so signed leases land in your property management software automatically.

“Is it worth it at my volume?” The Free plan includes five signature requests per month and is free forever. For a small homeowners’ association, that is often already enough.

Conclusion

Signing leases digitally is legally straightforward as long as you follow one rule: for fixed-term residential leases of more than one year, the QES secures the written form under § 550 BGB. For everything else, including long-term commercial leases since 2025, SES and AES are enough. The gain is measurable: faster letting, complete documentation and never again a lost handover report.