---
title: Certainties
description: Record a deposit or other certainty on a rental contract in the Certainties module, and process the deposit from sales invoice to refund.
---
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October 20, 2026
# Certainties
## Record a deposit or other certainty on a rental contract
In the Certainties module, you record which financial guarantee a tenant has provided, such as a deposit. In this article, you'll read what certainties are and how to process a deposit, from sales invoice to refund.
**In this article**
1. [What are certainties?](https://knowledge.owner.app/en/certainties#wat-zijn-zekerheden)
2. [Processing a deposit](https://knowledge.owner.app/en/certainties#borg-verwerken)
3. [Frequently asked questions](https://knowledge.owner.app/en/certainties#veelgestelde-vragen)
- [Frequently asked questions about certainties and deposits](https://knowledge.owner.app/en/certainties#faq-zekerheden)
## What are certainties?
A certainty is a financial guarantee that a tenant provides and that you link to a rental contract. You record which certainty the tenant has provided and keep track of whether it has been fulfilled. The best-known certainty is the **Deposit**; that's why the module is called **Certainties** (deposits and bank guarantees), with the deposit as one of the types.
You'll find all certainties under **Contracts** → **Certainties**. For each certainty, you see the rental contract, the type, the amount, the status and any files.
| Type | What it is |
| --- | --- |
| **Deposit** | An amount the tenant pays and that you refund or offset at the end of the tenancy. |
| **Bank guarantee** | A guarantee from the tenant's bank. Add the document from the bank as a file. |
| **Corporate guarantee** | A guarantee from the tenant's parent company. Add the guarantee document as an attachment. |
| **Guarantee** | A third party, such as a parent or another company, guarantees the tenant's obligations. |
| Status | Meaning |
| --- | --- |
| **Open** | The certainty hasn't been received yet. |
| **Received** | The tenant has provided or paid the certainty. |
| **Refunded** | The certainty was refunded at the end of the tenancy. |
- Link a certainty to a rental contract.
- Keep track of whether the certainty has been fulfilled.
- Register a deposit as a sales invoice and refund or offset it later.
## Processing a deposit
### Step 1 – Create a sales invoice for the deposit
You register a deposit in OWNER with a sales invoice. That way, the tenant actually has to pay it, and you can see whether it has come in.
1. Create a sales invoice for the deposit on the rental contract.
2. Choose **Deposit** as the sales item. If it doesn't exist yet, create a sales item **Deposit**.
3. As the due date, choose the latest day by which you want to have received the deposit. If it hasn't been paid by then, OWNER can remind the tenant.
### Step 2 – Refund the deposit at the end of the tenancy
Once the handover inspection is complete, you have two options:
| Situation | What you do |
| --- | --- |
| **Refund the full deposit** | Credit the original sales invoice for the deposit. A credit invoice is always a full, negative copy of the original sales invoice and can't be edited. |
| **Withhold costs** | Manually create a new sales invoice with the deposit as a negative amount and the costs (for example, painting work) as a positive amount. |
**Example with costs**
| Line | Amount |
| --- | --- |
| Deposit | −€ 1,000 |
| Painting costs | € 250 |
| **Total** | **−€ 750** |
**Example without costs**
| Line | Amount |
| --- | --- |
| Deposit | −€ 1,000 |
| **Total** | **−€ 1,000** |
## Frequently asked questions
### Frequently asked questions about certainties and deposits
#### Why do I need to create a sales invoice for the deposit?
Without a sales invoice, you can't register the deposit in OWNER and you can't see whether the tenant has paid it. With a sales invoice, automatic reminders work too.
#### Can I edit a credit invoice for the deposit?
No. A credit invoice is always a full, negative copy of the original sales invoice. If you want to withhold costs, create a manual sales invoice as described in [Processing a deposit](https://knowledge.owner.app/en/certainties#borg-verwerken).
#### Which sales item do I use for the deposit?
The sales item **Deposit**. If it doesn't exist yet, create it. If you work with an accounting integration, link it to the right ledger account.
[↑ Back to the questions](https://knowledge.owner.app/en/certainties#veelgestelde-vragen)
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