A balloon payment is a large payment due at the end of a mortgage. A balloon loan is a type of loan that does not fully amortize over its term.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 mortgage is any mortgage that requires a balloon payment. This can includes interest only mortgages. Instead, a borrower may have a different fixed-term: for example, 10 years, with a 30-year amortization.