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Property Investment Calculator | BonBon Estate | BonBon Estate

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Property Investment Calculator

Model the numbers behind a buy-to-let purchase — stamp duty, mortgage, rental yield and cash-on-cash return — in seconds.

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[SET BEFORE LAUNCH] Bonbong Estate Ltd · Company No. [SET BEFORE LAUNCH] 00000000

Registered office: [SET BEFORE LAUNCH] 1 Example Street, London, EC1A 1AA, United Kingdom

Redress scheme: [SET BEFORE LAUNCH] The Property Ombudsman (TPO), membership no. TBC

[SET BEFORE LAUNCH] +44 20 0000 0000 · [SET BEFORE LAUNCH] info@bonbongestate.com

© 2026 BonBon Estate. All rights reserved.

Made with ♥ for finding your perfect home

Property & mortgage

Property price

£

The agreed purchase price.

Deposit

%

Share of the price paid upfront.

Interest rate

%

Annual mortgage interest rate.

Mortgage term

years

Length of the mortgage.

Repayment type

How the mortgage is repaid.

Rental income & costs

Monthly rent

£

Expected gross monthly rent.

Vacancy rate

%

Share of the year the property sits empty.

Maintenance & management

%

Running costs as a share of effective rent.

Other purchase costs

£

Legal, survey and broker fees.

Buyer type

Buyer type

Drives the stamp duty band applied.

Your results

Monthly cash flow: -£416/mo
Net yield: 4.26%
Cash-on-cash ROI: -2.99%

Breakdown

Stamp duty (SDLT): £40,000
Upfront cash needed: £167,000
Deposit: £125,000
Loan amount: £375,000
Monthly mortgage: £2,192
Gross annual rent: £26,400
Gross yield: 5.28%
Net operating income: £21,318

For illustration only — not financial, tax or legal advice. SDLT shown is England & NI 2025/26. Consult qualified professionals.