Tanda has two ways of preventing your employees leave balance from becoming negative - they are:
Prevent leave requests being submitted that require more leave than the employee has available
Using a 'fallback' leave type to automatically default to when an employee uses the whole balance of a leave type
How it works
You can find these settings by clicking Leave in the top navigation bar, then navigating to the Tools menu in the top right hand corner and selecting View leave types:
Select the leave type you would like to prevent negative balances for:
Click 'Leave Balances can't go below 0'
Once 'leave balances can't go below 0' is selected, the two options will appear as shown below:
Prevent leave requests being submitted
This prevents employees submitting leave requests of this type if their request would put them into a negative balance of this leave type.
Allow leave to fall back on another leave type
If you choose this option, you'll need to select a default type to fall back on (eg. Unpaid Leave). Employees will still be able to submit leave requests which would put them into negative balances.
However, when they do so, an actionable card will appear on the relevant timesheet. You or other managers will then be able to split the leave such that the negative balance will be turned into another leave request of the fallback type.
If the leave request will fall back on another leave type which has the fall back setting enabled, the fall backs will cascade.
For example, if a 10hr Sick Leave leave request needs to fall back, and has a -5hr balance, and will fall back on Annual Leave, which has a 3hr balance and falls back to Unpaid Leave, the result will be: A 5hr Sick Leave request, 0hr Sick Leave balance. A 3hr Annual Leave request, 0hr Annual Leave balance. And a 2hr Unpaid Leave request, which does not accrue balance.