When a tenant is officially vacating the flat/house, they should hand over the key to the owner of the flat or house, so that the tenant is no longer responsible for the rent or any damages. And it allows the landlord to return the security deposit.
A signed key handover form is also legal evidence. Here you can find a sample flat key handover form that you can download and use.
Flat Key Handover Form

If you are looking for a letter format instead of the form, you can use this simple letter.
Recommend : Letter Formats to Society Members for Maintenance Charges
Flat Key Handover Letter
To Date:
The Flat Owner,
Flat Details,
Address.
Sub: Flat key handover.
Dear Sir/Madam,
I am writing to inform you that I am vacating the flat located at ………………………………………………………………………………………………………….. (flat address). I have handed over all the keys of the flat to you on ………………….. (date).
Thank you for your support during my stay.
Sincerely,
Tenant name
Signature
Mobile Number
Here are some tips while handing over flat keys to the flat owner /landlord.
- Make sure the flat is clean and in good condition before the handover.
- Pay pending rent, electricity bill, maintenance, etc..
- Take the final electricity meter reading and take photos if needed.
- List all the keys you are returning like the main door, bedroom, meter room etc.