Family Offset Mortgages Explained

Everything you need to know about Family Offset Mortgages and how to get the best rates

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Home Offset Mortgages Family Offset Mortgages Explained
Pete Mugleston

Author: Pete Mugleston

CeMAP Mortgage Advisor, MD

Nathan Porter

Reviewed by: Nathan Porter

Independent Mortgage Advisor

Updated: June 30, 2025

If you’re looking to buy a home but don’t have a deposit saved, family-offset mortgages, otherwise known as parent-offset mortgages, offer a potential solution. Allowing relatives to support you in your application can speed up your path to home ownership and decrease the stress, but how do they work?

The guide below explains how a family offset mortgage operates, where to find the best rates and the benefits of pursuing this type of mortgage.

How do family offset mortgages work?

This is where a buyer’s family member/s put up their savings, usually in place of a deposit, to offset against a mortgage. After being transferred into an account linked to the mortgage, the lender deducts the savings from the loan, thus reducing the capital that needs to be borrowed.

For example, if a borrower requires a £250,000 mortgage but a family member has £50,000 in a savings account, this could be linked to a mortgage account, reducing the loan needed to £200,000. Interest would only be paid on the £200,000, rather than the full amount.

Once the borrower has repaid around 25% to 30% of the mortgage, usually within an agreed-upon timeframe, 5 years is the norm; the savings are transferred back to the relative.

Popular among first-time buyers, this product provides an alternative way of getting onto the property ladder for those without a sizable down payment or access to a government scheme. For the lender, it offers security should the borrower be unable to repay the loan.

Work Out How Much Interest You Can Save

You can use our offset mortgage calculator below, based on your own specific circumstances, to see how much interest can be saved using a family offset mortgage:

calculator icon

Family Offset Mortgage Calculator

This calculator shows you how your mortgage payments could look if you choose a family offset mortgage and how much you could potentially save with this product type.

The total amount you're borrowing
£
Enter the mortgage rate, 5.5% is a typical rate currently but this can vary
%
Enter the mortgage term, 25 years is the average but lenders can offer shorter and longer terms
years
Enter an amount in pound sterling
£
Savings amount must be less than the loan amount

Without offset savings:

Monthly repayments:

Total cost:

With offset savings:

Monthly repayments:

Total cost:

Now that you have a rough idea of how much you could save on interest, you should speak to a specialist broker for bespoke advice about family offset mortgages and access to the best deals that you qualify for.

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Who is eligible?

As with any mortgage, a lender judges eligibility on creditworthiness, something a broker would be able to independently advise on ahead of an application submission. That means looking at a borrower’s earnings and what they’re left with at the end of the month to determine whether they can afford the repayments.

They’ll consider any outstanding debt, look at credit history and ask whether the property is of non-standard construction, among other assessments.

Specific to this type of loan, a lender will also consider:

  • The family member/s in question: Often, parents use this model to support their children, but certain mortgage providers allow other relatives to put their savings forward. For example, Nationwide will only consider legal relatives, but Barclays will have more flexibility.
  • The savings available: Most lenders require 10% to 20% of the property’s value to be in the savings account. However, certain lenders make it a general rule that at least £50,000 must be in the account. Alternatively, they might require the family member to earn upward of £75,000 annually.
  • Any deposit available: A deposit can be used in addition to the savings. This would lower the loan-to-value (LTV) ratio, leading to a lower interest rate.

Repayment options

Depending on how you choose to pay back the loan, you can:

  • Shorten your mortgage term: In this scenario, the lower interest rate you can access through this mortgage means a bigger percentage of your monthly repayments can go toward paying off the loan. That means you’re likely to pay it back at a quicker rate, reducing your mortgage term.

OR:

  • Lower monthly repayments: Another option is to use the savings to reduce your monthly repayments. The mortgage term will remain the same, but you’ll spend less each month.

You can use our family offset mortgage calculator above to determine which payment model might work best. Most lenders offer these to give you an idea of what your monthly repayments could look like, but it’s always best to verify these estimates with a broker who can take a full picture of your finances and lay out what’s realistic for you.

What happens if you default on the repayments?

If the homeowner fails to make the repayments, the lender will hold onto the family savings for longer than agreed, usually until the issue has been resolved. If it gets to the point where the property must be repossessed, some of the savings could be used to pay off the remaining balance on the mortgage.

Throughout this process, both parties will need legal advice from different solicitors and having a broker could help answer any procedural questions.

How an offset mortgage broker can help

Buying a home for the first time is a complex process. Add to that the extra paperwork and elements of family savings and expectations, and working with a specialist family offset mortgage advisor is essential. They’ll coordinate all elements of an application and ensure the best deal for yourself and your family while improving your chances of mortgage approval.

Additionally, they can:

  1. Assess your financial situation and determine whether a family offset mortgage is the smartest way forward for you.
  2. Advise on which repayment model will work best in your situation.
  3. Tap into their lender database to find one likely to offer you the lowest rate and best terms so you can have your family’s savings returned to them as soon as possible.

The benefits of a family offset mortgage.

Although this can seem like a risky arrangement, especially for the family member who is trusting the borrower to be able to repay the loan, there are multiple benefits to pursuing this type of mortgage.

  • It allows for earlier home ownership: Saving a deposit can take a long time for a first-time buyer. Having family savings as an alternative allows for a quicker entrance into the property market.
  • It has the potential to reduce repayments: Having a significant amount of money to offset the loan can mean smaller, more affordable repayments. Applying to borrow a smaller amount also means you’ve got a lower LTV ratio and are, therefore, less risky to a lender who, in turn, will lower the interest rate.
  • It enables family members to help without it costing them: In theory, Family members can help a first-time buyer make that all-important first purchase without having to lose any money.

The table below provides a quick summary of the advantages and disadvantages of family offset mortgages.

Pros Cons
Quicker access onto the property ladder Requires trust in the borrower to pay off the mortgage
Gives family members a way of supporting without losing money Family member cannot access savings until a portion of the loan is repaid
Reduces repayments and interest for the borrower Fewer lenders offer this type of mortgage
Could mean access to better mortgage rates If the loan isn’t paid, the family member’s savings are jeopardised

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The lending market

The market for family offset mortgages is smaller than conventional mortgages, but some high-street mortgage providers offer them, subject to availability.

They include…

  • The Post Office offers the family link mortgage with a 90% LTV
  • Halifax has a family boost mortgage, which holds the savings for 3 years rather than 5
  • Nationwide has a family deposit mortgage that allows family members to use equity in their home rather than savings. They would, however, have to already have their mortgage with Nationwide.

Alternatively, specialist lenders, such as The Family Building Society, could offer more flexible arrangements and consider extra factors such as self-employment or bad credit.

The only way to know which will offer the best deal based on your circumstances is by working with an advisor who has a history of securing family offset mortgages.

Get matched with a family-offset mortgage broker

With a few more factors, and family members, involved in such a mortgage, tailored and timely support is invaluable. A broker who specialises in this niche form of borrowing can help refine your search for the ideal family offset mortgage while also supporting your application as a first-time buyer and answering any questions you or your family may have.

The brokers we work with are experts in their field. Many of them arrange family offset mortgages regularly. They are focused on creating a smooth home ownership journey.

Reach out today via 0330 818 7026 or our enquiry form to connect to an expert who is ideal for you. To kick things off, enjoy a free, no-obligation consultation.

FAQs

Yes, although they are harder to come by. A broker can share which providers are open to such an arrangement.

No. Some lenders offer this arrangement for home movers as well.

A gifted deposit comes with zero expectation of repayment, whereas a family offset mortgage means the family member should receive their savings back in full.

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Pete Mugleston

CeMAP Mortgage Advisor, MD

Pete, a CeMAP-qualified mortgage advisor and an expert in all things mortgages, cut his teeth right in the middle of the credit crunch. With plenty of people needing help and few mortgage providers lending, Pete successfully went the extra mile to find mortgages for people whom many others considered lost...

Pete, a CeMAP-qualified mortgage advisor and an expert in all things mortgages, cut his teeth right in the middle of the credit crunch. With plenty of people needing help and few mortgage providers lending, Pete successfully went the extra mile to find mortgages for people whom many others considered lost causes. The experience he gained and his love of helping people reach their goals led him to establish Online Mortgage Advisor, with one clear vision – to help as many customers as possible get the right advice, regardless of need or background.

Pete’s presence in the industry as the ‘go-to’ for specialist finance continues to grow, and he is regularly cited in and writes for both local and national press, as well as trade publications, with a regular column in Mortgage Introducer and being the exclusive mortgage expert for LOVEMoney. Pete also writes for Online Mortgage Advisor of course!

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