🧮 Free tool

Shared Ownership Calculator

Estimate your monthly mortgage, rent, and service charge costs — all in one place.

🔒 No sign-up needed ⚡ Instant results 🇬🇧 UK tax rates built in
  1. 1

    Enter property details

    Property value, your share percentage, and deposit.

  2. 2

    Adjust your mortgage

    Set interest rate, loan term, and any known costs.

  3. 3

    See your breakdown

    Get a detailed monthly cost estimate instantly.

🔍 Need eligibility checks, dual income support, or staircasing projections? Try our advanced calculator.
ℹ️ This calculator provides estimates only — not financial advice. Speak to an FCA-regulated adviser before making any decisions.
Est. monthly total£784.17
Your details
1
Property detailsTell us about the property you're looking at.
£250,000
25%
Your share£62,500
Unowned£187,500
£18,750

That's 30.0% of your £62,500 share.

2
Mortgage detailsSet up your mortgage terms.
4.95%
25 years
3
Other costsRent and service charge for the property.
£100.00/mo
£0.00/mo

Auto-estimated at 2.75% p.a. on unowned share (£429.69/mo).

4
Your income optionalAdd your income to check affordability.
—
Enter your take-home pay to unlock personalised affordability checks and see if this property fits your budget.
Your estimate
Estimated monthly total
£784.17
That's £9,410 per year

This is the combined cost you'd pay each month, including your mortgage repayment, rent on the share you don't own, and building service charges.

Where your money goesEach month, your payment is split into three parts:
Mortgage repayment
£254.49

Your monthly payment to the mortgage lender for the share you're buying (25% = £62,500), minus your £18,750 deposit. This builds your equity over time.

32% of total
Rent to housing association
£429.69

Paid to the housing association for the 75% share you don't own (£187,500). This is typically reviewed & may increase annually.

55% of total
Service charge
£100.00

Covers building maintenance, communal areas, and management fees. Set by the freeholder or management company — ask for exact figures before you commit.

13% of total
Want to check affordability?Enter your net monthly income on the left to see if this property fits your budget.
Can you afford it?Rough estimates to help you gauge affordability. Lenders will do their own, more detailed checks.
Mortgage amount
£43,750
The loan you'd need. Your LTV (loan-to-value) on your share is 70.0% — under 90% is usually needed.
Min. take-home pay needed
£1,742.61
Monthly net income required so housing stays within 45% of your pay.
Est. gross salary needed
£24,154/yr
Pre-tax annual salary estimated using 6 April 2025 to 5 April 2026 tax & NI rates.
Income multiple check
£9,722/yr
Lenders typically lend 4.5× your salary. You'd need this gross income to borrow £43,750.

Information only — not financial advice. Lenders use their own affordability models. Always speak to a mortgage adviser for personalised guidance.

Before you rely on these numbers

  • This is an estimator. Real monthly payments depend on your lender, your scheme, fees, and whether the property is new build or resale.
  • Rent is often reviewed annually by the housing association and can increase.
  • This site is for informational purposes only and does not provide financial advice. Always speak to a qualified mortgage adviser.

Common questions

How accurate is this calculator?

It provides estimates based on the values you enter and general assumptions. Actual costs depend on your lender, housing association, and property-specific factors. Always verify with a mortgage adviser.

What costs does it include?

The calculator estimates three main costs: mortgage payments on your owned share, rent paid to the housing association on the unowned portion, and typical service charges for building maintenance.

Is this financial advice?

No. This tool is for informational purposes only. For personalised financial advice, please consult an FCA-regulated mortgage adviser.

What share percentage should I choose?

Most shared ownership schemes let you buy between 10% and 75%. A lower share means smaller mortgage payments but higher rent to the housing association. 25% is the most common starting share.

Can I buy more shares later?

Yes — this is called "staircasing". You can buy additional shares over time, increasing your ownership until you own 100%. Each step is usually at market value at the time of purchase.

How is shared ownership rent calculated?

Shared ownership rent is typically set at 2.75% of the housing association's share of the property value per year. For example, if the property is worth £300,000 and you own 25%, the housing association's share is £225,000. Annual rent would be £6,187.50 (£225,000 × 2.75%), or roughly £515.63 per month.

How much are shared ownership monthly repayments?

Monthly repayments for shared ownership typically include mortgage payments on your share, rent to the housing association on the remaining share, and a service charge. For a £300,000 property with a 25% share, you might pay around £350–£450 for your mortgage, £500–£520 in rent, and £100–£200 in service charges — totalling roughly £950–£1,170 per month. Use our calculator above for a personalised estimate.

Read our guides → What is shared ownership?