Lump Sum Expenses are expenses that are irregular and come in a lump sum at some
known time (eg. holidays, renovations, car update, etc).
For example, you may be thinking about doing some renovations in December
Since this is a once-off expense you would enter it as a Lump Sum Expense.
The money to be spent on this item will affect the term of your home loan.
However, by being aware of the result of lump sum expenditures on the term of
your Home Loan, you can make informed decisions about whether to incur such
expenses or not.