Help to Buy Equity Loan Calculator
Use this tool to estimate deposit, government equity loan, mortgage size, monthly mortgage repayment, and estimated equity-loan fee from year 6 onward.
Educational estimate only. Actual lender affordability checks, scheme limits, and legal costs are not included.
What this Help to Buy calculator does
This calculator models the classic Help to Buy equity loan structure: your deposit + government equity loan + mortgage = property price. It gives you a quick planning view of how much you may need upfront, how large your mortgage could be, and what your monthly repayment might look like.
It also estimates the equity-loan fee that usually starts in year 6. That fee is separate from your mortgage repayment, so it is useful to see both numbers side by side before committing to a purchase.
Important context in 2026
In England, the Help to Buy equity loan scheme has closed to new applications, but many households still have existing loans and want to plan remortgaging, staircasing, or repayment strategies. Similar shared-equity style products may still exist in different forms depending on region, developer, or local policy.
This page is therefore best used as a financial planning calculator for legacy Help to Buy borrowers and anyone comparing the same structure in other schemes.
How the calculation works
1) Deposit amount
Deposit amount is calculated as:
Property price × deposit percentage
2) Equity loan amount
Equity loan amount is calculated as:
Property price × equity loan percentage
3) Mortgage required
Mortgage required is:
Property price − deposit − equity loan
4) Monthly mortgage payment
The calculator uses a standard capital-and-interest repayment formula based on your interest rate and mortgage term. This gives you a practical monthly estimate, not an offer from a lender.
5) Equity loan fee from year 6
The calculator estimates:
Equity loan amount × annual fee rate ÷ 12
Real schemes may use an inflation-linked annual increase, so treat this as a starting-year estimate.
Example scenario
Suppose you buy at £300,000 with a 10% deposit and a 20% equity loan:
- Deposit: £30,000
- Equity loan: £60,000
- Mortgage: £210,000
At a 4.75% rate over 30 years, the monthly mortgage payment is approximately the amount shown in the calculator result. You can then add the year-6 equity-loan fee estimate to understand future monthly pressure on your budget.
What this calculator does not include
- Arrangement fees, valuation fees, legal costs, and moving costs
- Service charges and ground rent (if applicable)
- Buildings insurance and life/critical illness cover
- Changes in interest rate over time (for variable products)
- Future house price growth or fall (which affects equity repayment value)
Tips for using the tool effectively
Stress-test your budget
Re-run with a higher mortgage rate (for example +1% to +2%) to see whether the monthly payment is still comfortable.
Check deposit sensitivity
Try increasing your deposit from 5% to 10% or 15%. A larger deposit can reduce your mortgage size and may improve lender terms.
Plan ahead for year 6+
Many buyers focus only on initial years. Use the “equity loan fee” output now so there are no surprises later.
Frequently asked questions
Is this an official government calculator?
No. It is an educational planning tool based on common Help to Buy-style mechanics.
Does this tell me if I will be approved?
No. Mortgage approval depends on affordability checks, credit history, income, debt, and lender policy.
Can I use this for remortgage planning?
Yes. It is useful for “what-if” scenarios when reviewing an existing Help to Buy equity loan position.
Final thoughts
A Help to Buy style structure can make buying possible earlier, but it adds a second layer of planning: your mortgage and your equity loan obligations. Use this calculator to understand both clearly, then confirm numbers with a qualified mortgage adviser before making decisions.