Choose Add Items in the scenario, create a new item and select Expense.
- Name the cost in a way you will recognise.
- Enter the amount.
- Choose its real frequency, such as weekly, monthly or yearly.
- Save the item.
Use the actual billing frequency when you know it. A yearly insurance bill belongs as Yearly, even though the calculator will show its monthly effect.
Worth knowing: If the amount changes, a rounded likely figure is fine. Add “estimate” to the description so you remember to revisit it.