To obtain financing for construction projects, businesses in the construction industry often use the balloon mortgage as they don't require offering collateral. A balloon mortgage comes with an unusual twist.Learn everything you need to know about balloon notes in mortgage loans. Find out how they work and how they can affect your finances. A balloon payment is a large payment due at the end of a mortgage. A balloon payment is a lump sum that's due at the end of the loan term. It is good because it will: Lower your loan repayments.