Co-Borrower
Last reviewed 13 June 2026 by Nick Lim, finance broker (FBAA).
Co-Borrower is a person who applies for and takes on a loan jointly with another borrower, sharing equal legal responsibility for repaying the full debt. Unlike a guarantor, a co-borrower is on the loan from day one and their income and debts are fully assessed in serviceability, with both names on the loan and usually on title. Adding a co-borrower can lift borrowing capacity but also exposes them to the whole debt.
Why Co-Borrower Matters
A co-borrower shares the loan fully, which can boost capacity but ties both people to the entire debt.
- Jointly liable for the full loan
- Income and debts assessed in serviceability
- Usually on title as well as the loan
- Different from a guarantor, who backs but does not borrow
- Can lift borrowing capacity
Common Features of Co-Borrower
- Equal legal responsibility for the debt
- Named on the loan and often the title
- Full financials assessed
- Common between spouses or business partners
- Hard to remove without refinancing
Official reference: moneysmart.gov.au
What is a co-borrower?
Someone who takes on a loan jointly with another borrower, equally responsible for the whole debt and assessed in serviceability.
Co-borrower vs guarantor?
A co-borrower borrows and is on title; a guarantor backs the loan but does not borrow or usually go on title.
Does a co-borrower improve borrowing power?
It can, because their income is added, but their debts count too in borrowing capacity.
Can a co-borrower be removed later?
Usually only by refinancing, since they are a party to the loan.
Are both co-borrowers liable for the full amount?
Yes, each is liable for the entire debt, not just a share.