Commercial leases - How to add a one-time amount in Plexflow

In some situations, a lease may require the addition of a one-time amount on a specific date.
For example: the annual allocation of municipal taxes, a maintenance fee adjustment, or any other exceptional expense.
This lets you add a single invoice without changing the lease’s regular billing calendar.

⚙️ Preliminary note
The Plexflow system was not originally designed for managing commercial leases.
However, several features have been added to allow greater flexibility, in particular to add one-time amounts or unique adjustments.

Steps

Step 1 – Go to Rent Details in question

Go to the Rents section, then select the active lease for which you want to add a one-time amount.

Step 2 – Add a new invoice

In the Upcoming Invoices section, click the Add ➕ button to create a one-time invoice.

👉 If you are not sure of the difference between an invoice and a collection, see this article:
Understanding the rent billing process in Plexflow

Step 3 – Choose a date different from an existing rent

⚠️ Very important
The system does not allow two invoices on the same date.
You must therefore choose a different date from your regular rents (e.g. January 2 if the regular rent is on January 1).
Then enter the desired amount.
👉 If this amount must include taxes, enter the total amount directly.

Step 4 – Edit the invoice information

Once the invoice has been added, you can adjust the details:

• the type of service or rent
• Exact amount
• the applicable tax (No tax, TPS 5%, TVQ 9.975%, or TPS&TVQ 14.975%)
• Payment method and internal note

Updated on: 12/11/2026