Guaranteeing someone else's borrowing

The points below about guaranteeing borrowing for others are ordered by how much difference they make, not by how often they get repeated.

You are agreeing to pay, not to help

A guarantee is a promise to meet the obligation if the borrower does not, and in most forms it covers the entire amount rather than part of it. Lenders generally do not have to exhaust their options against the borrower first, though this varies by jurisdiction and by the wording used.

That means the first you may hear about a problem is a demand addressed to you for a sum you did not spend. Interest, charges and legal costs accrued along the way are frequently included in what you are liable for. People agree to these because the request comes from someone they love, and the document is not written by that person.

It shows up on your own record

In many countries a guarantee is recorded against you and is taken into account when you apply for credit of your own. This can reduce what you are able to borrow for a mortgage, sometimes by a substantial amount, years after you signed. If the borrower misses payments, the record of that can affect your own standing depending on how the arrangement is reported.

In practice, how this works differs between countries and between types of agreement, so the specifics need checking locally. The general point is that the commitment is not dormant; it sits in your file and is priced by anyone assessing you.

You usually cannot get out of it

Once borrowing has been advanced on the strength of a guarantee, withdrawing generally requires the lender's agreement, which they have no reason to give. That means the commitment may outlast your relationship with the borrower, your marriage, a house move or a change in your circumstances. Some agreements are open-ended, covering future borrowing as well as the original amount, which is a materially different promise.

For most people, reading whether the guarantee is limited in amount and in time is the single most important thing to check before signing. Where it is not limited, asking for a cap and an end date is a reasonable request and is sometimes granted.

Decide what you would actually do

The only honest way to approach the request is to assume you will have to pay and ask whether you could. If the answer is that you could not without selling your home or emptying your retirement provision, that is a reason to decline. Declining is difficult and it is considerably less damaging to a relationship than defaulting on the guarantee years later.

An alternative that helps many families is a smaller outright gift or loan you could afford to lose entirely. That converts an unlimited exposure into a known one, which is usually a better deal for everybody involved.

If you do it, do it with information

Ask to see the agreement rather than a summary, and take independent advice, which some lenders require in any case. Agree with the borrower that you will be told immediately about any missed payment rather than finding out from the lender. Ask the lender what notice you would receive and at what point they would approach you.

The useful part is this: keep your own copy of everything, because the borrower's records are frequently incomplete when they are most needed. None of this reduces the liability; all of it reduces the chance of being surprised by it.

The family version is the hardest

Guarantees inside families carry an expectation that the relationship makes the risk smaller, when it usually only makes it harder to enforce. A parent guaranteeing a child's tenancy or first mortgage is common, and the exposure sits precisely in the years the parent should be building retirement provision.

It also creates a position where a parent may be unable to help with anything else because the capacity is already committed. Where several children exist, one guarantee frequently creates an expectation of equivalent help for the others. Thinking about it as a family-wide commitment rather than a single favour tends to produce a more sustainable answer.

Everything above, in order of what to do first

1. You are agreeing to pay, not to help. A guarantee is a promise to meet the obligation if the borrower does not, and in most forms it covers the entire amount rather than part of it.
2. It shows up on your own record. In many countries a guarantee is recorded against you and is taken into account when you apply for credit of your own.
3. You usually cannot get out of it. Once borrowing has been advanced on the strength of a guarantee, withdrawing generally requires the lender's agreement, which they have no reason to give.
4. Decide what you would actually do. The only honest way to approach the request is to assume you will have to pay and ask whether you could.
5. If you do it, do it with information. Ask to see the agreement rather than a summary, and take independent advice, which some lenders require in any case.
6. The family version is the hardest. Guarantees inside families carry an expectation that the relationship makes the risk smaller, when it usually only makes it harder to enforce.

The takeaway

Assume you will pay it, ask whether you could, and never sign something without a cap and an end date.

Pick the one that costs you least, and let the rest wait.