Guarantor or co-borrower: what's the difference?

For partners, parents and friends asked to go on someone else's loan, as a borrower or a guarantor.

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The short answer

A co-borrower is a party to the loan and owes all of it from the first day, whether or not they own the property. A guarantor promises to pay only if the borrower doesn't, usually up to a set limit, and has extra protections under the Banking Code of Practice about information, timing and enforcement.

Key points

  • Co-borrowers are usually jointly and severally liable: the lender can ask either of you for the full amount.
  • A guarantor's liability arises only if the borrower defaults, and is capped by the guarantee's limit.
  • As a co-borrower the loan is your debt, so it counts against you when you apply for credit yourself.
  • A Code bank won't accept a co-borrower who gets no substantial benefit without extra checks.
  • Once the loan money is drawn, neither role is easy to leave without refinancing or selling.

What does a co-borrower sign up for?

A co-borrower signs the loan contract as a borrower. Co-borrowers are usually jointly and severally liable, so the lender can ask any one of you for every repayment and for the whole balance, whatever you have agreed between yourselves. The loan is your debt. It is reported on your credit file, and other lenders will count it when you apply for credit of your own.

What does a guarantor sign up for?

A guarantor makes a separate promise to the lender: if the borrower doesn't pay, you will. Your liability only arises on the borrower's default, and under the Banking Code of Practice a guarantee to a bank must be limited, either to an amount or to the value of a particular property. A guarantee is often backed by a mortgage over the guarantor's own home.

Banks that follow the Code also give guarantors protections a co-borrower doesn't get. You receive information about the borrower's loan before you sign, the bank can't accept your guarantee until the third day after giving you that information unless you've had independent legal advice, you can withdraw before the loan money is first provided, and the bank must usually enforce the borrower's security before yours. Our guide to what happens to a guarantor if the borrower defaults has the detail.

Do I need to be on the title?

Not necessarily, in either role. That is the risk for a co-borrower. You can owe the whole loan for a property you don't own. The Banking Code deals with this directly. If you will not receive a substantial benefit from the loan, a bank bound by the Code won't approve you as a co-borrower unless it has:

  • taken reasonable steps to make sure you understand the risks, and the difference between being a co-borrower and a guarantor;
  • taken into account why you want to be a co-borrower; and
  • satisfied itself that you are not experiencing financial abuse.

A substantial benefit includes getting a reasonably proportionate share of the property bought with the loan, or having a reasonable part of the loan used to pay your own debts.

Guarantors usually don't own the property they are supporting. That is expected, and it's why their liability is limited.

Why would a lender want a co-borrower rather than a guarantor?

Lenders usually require anyone whose income is being used to approve the loan to be a borrower, and anyone who will be on the title to sign the loan and mortgage. If a lender asks you to be a co-borrower when you won't own any of the property or use any of the money, ask why, and whether a limited guarantee would do instead.

How do I get out later?

Leaving is hard in both roles. Under the Banking Code, a co-borrower can end their liability by written request only before credit has been provided or relied on, or for future advances where the bank can stop further lending. Otherwise the loan has to be refinanced into the other borrower's name, or the property sold.

A guarantor can withdraw before the loan money is first provided, or later if the loan the borrower signed differs in a material way from the one you were shown. After that, you can ask the bank to lower your limit, pay out the lower of the debt and your limit, or be released when the loan is refinanced. Our guarantor's exit roadmap sets out the options. Separating couples face both problems at once, which we cover in joint guarantees after separation.

Where does independent legal advice fit?

Lenders commonly require guarantors to get independent legal advice and a solicitor's certificate before the guarantee is accepted. Many also ask for it from a co-borrower who gets no benefit from the loan. We advise both, at our Melbourne CBD office. Read what the solicitor explains before you sign to see what the appointment covers.

Common questions

It can. Lenders ask whether you have given any guarantees, and many treat the guaranteed amount as a commitment when assessing your own application. Tell a new lender about any guarantee you have given.

Usually not for them. A limited guarantee exposes your parents to a capped amount and only if you default, with Banking Code protections. As co-borrowers they would owe the whole loan from the start. Our guide to parent guarantor home loans explains the usual family guarantee.

No. Separation doesn't change what you owe the lender. You stay liable as a co-borrower or guarantor until the loan is repaid, refinanced or the lender releases you, whatever you agree with your former partner.

No. It applies to banks that have adopted it, for loans to individuals and small businesses and their guarantors. Many non-bank and private lenders are not bound by it, so check the terms of your loan or guarantee.

Your lender may ask for one, and even if it doesn't, advice before you sign is worth having. The appointment covers the same ground as for a guarantor: what you owe, what is at risk, and how you could get out.

Asked to co-sign or guarantee a loan?

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