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Help to Buy Mortgage Calculator

How are Help to Buy mortgages calculated? Get the right advice here.

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By Pete Mugleston  | Mortgage Advisor Pete has been a mortgage advisor for over 10 years, and is regularly cited in both trade and national press.

Updated: 8th July 2019* | Published: 6th February 2019

We get lots of enquiries from people who ask us things like “What is the best Help to Buy mortgage calculator?

There are a range of online Help to Buy mortgage calculators that each provide a different estimation which can make the process confusing, especially if you don’t have in-depth knowledge about the criteria that each lender uses to assess whether you will be approved or not.

The good news is that the brokers we work with can provide this information and find you the best mortgage deal based on your circumstances, even if you’ve been declined or have bad credit.

To help you calculate how much a Help to Buy mortgage could be, we have gathered all the key information you’ll need to know in this guide including:

For a Help to Buy mortgage quote that takes your personal situation into consideration, speak to an advisor.

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Where can I find a Help to Buy scheme mortgage calculator?

A lot of people want to use a Help to Buy Equity Loan mortgage calculator because they think this is the best way to see how much they can borrow.

Unfortunately, it isn’t. Online Help to Buy mortgage calculators in the UK don’t provide an accurate quote based on each individual's circumstances. There are so many affordability factors that lenders will take into consideration when assessing your application and each lender will have different rules about what they will and won’t accept.

There is a mortgage calculator you can use on the official Help to Buy websites here and here but keep in mind that it will only give you a rough idea of the deals available to you.

Is there a Help to Buy mortgage calculator for how much can you borrow?

Most mortgage providers cap their lending at 4.5 times the borrower’s salary, but if you’re using the Help to Buy scheme, it’s more a case of how much you need to borrow.

We’ve created a Help to Buy mortgage calculator table below to give you a brief overview for how much mortgage you’ll need to qualify for (75% of the property’s value), with a Help to Buy equity loan and the minimum required deposit of 5% factored into the equation.

Interest rate: 3% (for example purposes only)

Property Value

Deposit size (5%)

Equity Loan 20%

Mortgage loan required (75%)

















For an accurate idea of how much a mortgage you’ll need to buy a property through the Help to Buy scheme, make an enquiry and the advisors we work with will break it down for you.

How is the interest on a Help to Buy equity loan calculated?

It’s important that when you calculate how much your Help to Buy mortgage will cost that you factor in the interest rate charged on your equity loan.

The first five years of the Help to Buy equity loan is interest-free. After this, you'll be charged 1.75% on the outstanding amount as interest.

This will increase each year by RPI (Retail Price Index) which can increase or decrease due to inflation, plus 1%.

Equity Loan interest example

Property Value of £200,000 with a £40,000 Equity Loan

RPI of 5% (for example purposes only)


Interest rate

RPI + 1%

Interest Only Loan repayment (annual) 

0 - 5 years


















Your interest payments for your equity loan are paid alongside your mortgage payments and do not pay off your loan amount.

So for a mortgage of £200,000, in the 7th year of your mortgage you could be paying £744 annually for your interest payments on your equity loan as well as monthly mortgage payments of £711.

How are the repayments on my Help to Buy equity loan calculated?

You can choose to repay your loan during the term of your mortgage, although you also have the option to settle your Equity Loan as a lump sum when you sell your property.

Borrowers can make part repayments, known as staircasing, to reduce their ongoing costs when the interest-free period ends (after five years) and begin chipping away at the equity they have borrowed. Keep the following in mind if you’re considering staircasing…

  • You’re able to make repayments any time
  • Repayments must be at least 10% of your property’s value
  • Staircase payments could be subject to other criteria set by the mortgage provider
  • Every time you want to make a repayment, an independent valuer must assess your property and you will likely need to foot valuation fees for this

Furthermore, if the property increases in value over time, the loan amount you have to pay back will also increase in line with this.

As you can see, this can be complex so speaking to a mortgage broker who has experience in Equity Loans can really help. As well as looking at your finances and your situation to give you a tailored Equity Loan and mortgage quote, a mortgage broker can also find you the best interest rates on mortgages, to help keep your payments as low as possible. Speak to an advisor here.

How is help to buy mortgage calculated across the UK?



Equity Loan




Up to 15% of the purchase price

Your deposit and mortgage must cover a combined minimum of 85% of the purchase price









South England




South East England


20% (up to 40% in London)


North England




North West England 








Where can I find a mortgage calculator for Help to Buy Scotland?

The Scottish government’s Help to Buy website includes a sustainability calculator that lenders and financial advisors can use to determine whether a borrower is eligible for the scheme.

For detailed information about how Help to Buy Scotland mortgages are calculated - bespoke to your profile as a borrower - make an enquiry and the experts we work with will crunch the numbers for you and connect you to the lender offering the best deal you qualify for.

Where can I find a Help to Buy Wales mortgage calculator?

Help to Buy mortgages in Wales are calculated in much the same way as anywhere else in the UK (with the exception of Scotland and London), so any H2B mortgage calculator will give you a rough idea of the rates and deals on offer if you’re using the scheme there.

For a clearer idea of the deals and rates you will qualify for, bespoke to your profile as a borrower, make an enquiry and the experts we work with will calculate this for you.

Where can I find a Help to Buy new build mortgage calculator?

As the Help to Buy scheme is only available for new build properties, any Help to Buy calculator is essentially a ‘Help to Buy new build mortgage calculator.

You can find one of these calculators on the official Help to Buy website or make an enquiry to speak with an advisor for a clearer idea of the amount you can borrow.

Will Bad credit affect your Help to Buy mortgage?

Bad credit can affect your chances of approval for a HTB mortgage as well as the interest rate you may pay on your loan. Some lenders won’t accept borrowers with bad credit however there are specialist lenders who are more willing to lend to approve a mortgage for borrowers with a less than perfect credit history.

Because of this, it’s best to speak to one of the mortgage advisors we work with who has experience in Help to Buy mortgages for people with bad credit.

For advice about how the specific type of bad credit you have can affect your application, contact a bad credit mortgage specialist .

Alternatively, see our bad credit information section.

Why you should speak to an advisor about Help to Buy mortgage calculators

The Help to Buy mortgage advisors we work with are carefully selected and we choose to only work with whole of market mortgage brokers we trust to find you the best mortgage.

Here’s how the mortgage advisors we work with can help you:

  • Search an increased market and find the best mortgage rates and deals
  • They can calculate your mortgage and Equity Loan repayments to give you an accurate reflection of what you can expect to pay
  • They can also calculate your affordability to ensure that the lender you chose provides a loan that is affordable for you
  • Approval for the Help To Buy loan must be gained before a mortgage application can be submitted.  They can look after the Help To Buy application for you.

Make an enquiry and one of the experts will be in touch shortly to help.

Speak to a Help to Buy advisor

Then sit back and let us do all the hard work in finding the broker with the right expertise for your circumstances. We don’t charge a fee and there’s absolutely no obligation or marks on your credit rating.

Updated: 8th July 2019
OnlineMortgageAdvisor 2019 ©

FCA disclaimer

*Based on our research, the content contained in this article is accurate as of most recent time of writing. Lender criteria and policies change regularly so speak to one of the advisors we work with to confirm the most accurate up to date information. The info on the site is not tailored advice to each individual reader, and as such does not constitute financial advice. All advisors working with us are fully qualified to provide mortgage advice and work only for firms who are authorised and regulated by the Financial Conduct Authority. They will offer any advice specific to you and your needs. Some types of buy to let mortgages are not regulated by the FCA. Think carefully before securing other debts against your home. As a mortgage is secured against your home, it may be repossessed if you do not keep up with repayments on your mortgage. Equity released from your home will also be secured against it.

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