Shared ownership calculator

Shared ownership lets you buy 10% to 75% of a home and pay rent on the rest. Two costs sit side by side: a mortgage on your share, and rent on the part you do not own. This calculator brings both together for a realistic monthly figure. It is an estimate to help you plan, not a mortgage offer; ask us for a personal illustration matched to your circumstances.

What the shared ownership calculator shows you

Enter the full price and the share you plan to buy, and it estimates the mortgage on your share plus the rent on the rest: your deposit, your borrowing, the rent, and the total monthly cost. Worked example: on a £200,000 home, a 40% share is an £80,000 purchase, with the provider keeping the other 60% (£120,000). Your mortgage and deposit sit on the £80,000; your rent is charged on the £120,000 you do not own.

How much deposit do you need for shared ownership?

The big draw is the smaller deposit: it is based on the share you buy, not the full price, usually 5% to 10% of the share. In our example, 5% of the £80,000 share is £4,000 and 10% is £8,000, against £10,000 to £20,000 on the full £200,000 home. The calculator works it out on the share, which is why the figure is lower than a standard purchase.

Rent on the share you do not own

You pay rent to the provider on the share you have not bought. Under the government scheme, initial rent is capped at 2.75% of the unsold share a year. On our £120,000 unsold share that is up to £3,300 a year, about £275 a month, on top of the mortgage. Rent usually rises each year per your lease. The calculator includes it, so your total reflects both parts, which a standard mortgage calculator will not.

Shared ownership monthly cost calculator

As a shared ownership monthly cost calculator, it brings your whole outgoing together: mortgage on your share, rent on the unsold share, plus usually a service charge and ground rent for the building and communal areas. It estimates the mortgage and rent; the service charge and ground rent vary by property and are set by the provider, so ask for the exact figures and add them. Seeing the full monthly cost upfront is the difference between a comfortable move and a stretched one.

How much can you borrow on shared ownership?

A lender bases your mortgage on the share you buy and your income and outgoings, like a normal mortgage, but counts the rent as a commitment. To qualify, household income generally needs to be £80,000 or less, or £90,000 in London. Not every lender offers shared ownership, and those that do treat the rent and share differently, so advice earns its keep. As former bank managers, we know which lenders are comfortable with it and how to present your case. The calculator guides the borrowing; a conversation turns it into a figure a lender will stand behind.

Shared ownership remortgage calculator

Own a shared ownership home and coming off a fixed rate? Use this as a shared ownership remortgage calculator: enter your home’s current value and the share you own to estimate the new monthly cost of the mortgage plus rent on a fresh rate. Many owners staircase when they remortgage, buying more shares to cut the rent, and you can model that by increasing the share. We compare the lenders who offer shared ownership remortgages and handle it start to finish.

Common shared ownership questions

How much deposit do I need for a shared ownership mortgage?

Usually between 5% and 10% of the share you are buying, not the full property price. On a 40% share of a £200,000 home, that is a deposit of roughly £4,000 to £8,000.

Is the rent on top of the mortgage?

Yes. You pay a mortgage on the share you own and rent on the share you do not, plus a service charge and ground rent. The calculator adds the mortgage and rent together so you see a realistic monthly figure.

How much can I borrow for shared ownership?

It depends on your income, your outgoings and the share you are buying, with the rent counted as a commitment. Your household income generally needs to be £80,000 or less (£90,000 in London) to qualify for the scheme. We can give you a realistic borrowing figure once we know your circumstances.

Which lenders offer shared ownership mortgages?

Only some lenders offer them, and their terms differ. As former bank managers advising across Sleaford and Lincolnshire, we know which lenders suit shared ownership and can match you to one that fits.

Can I use this as a shared ownership remortgage calculator?

Yes. If you already own a share and are remortgaging, enter your home’s current value and the share you own to estimate your new monthly cost on a different rate. Increase the share to see the effect of staircasing at the same time. We can then compare shared ownership remortgage deals for you.

Ready to turn an estimate into a plan? See how our shared ownership mortgage advice works, or get a personal illustration from our Sleaford advisers, with no obligation. Your home may be repossessed if you do not keep up repayments on your mortgage.