Buy-to-Let Mortgage Calculator

How much could you borrow?

Use your buy-to-let mortgage calculator to quickly find out how much you might borrow based on your details. It only take a few minutes and NO CREDIT CHECKS!

Smarter buy-to-let decisions start here

Use these guides and resources to get the best mortgage options and grow your portfolio confidently.

Buy-to-let mortgage guide

This is your starting point to explore all essential buy-to-let mortgage information in one place.

First-time buy-to-let buyers

First-time landlords face challenges, but specialist lenders can help you secure the right mortgage.

Limited company buy-to-let

Using a limited company can save tax but involves specialist lenders and extra mortgage criteria.

Buy-to-let remortgage options

Switch lenders or products to secure better rates, lower costs, and maximise your rental profits.

Secured loans for landlords

Borrow against your current property to fund investments, renovations, or debt consolidation.

Interest-only buy-to-let

Explore interest-only mortgages, understand monthly payments, risks, and when they suit your goals.

Buy-to-let for portfolio landlords

Combine mortgages for multiple buy-to-let properties to simplify finances and grow your portfolio.

HMO Mortgages for Landlords

Mortgages for landlords with shared housing properties. Expert advice for HMO investments.

Frequently asked questions

Having a Buy-to-Let property can be like running your own business, which means you need to pay close attention to all costs. A Buy-to-Let mortgage calculator can be a valuable tool to help you understand how much you could borrow. Simply answer a few questions about your situation and plans, and our calculator will provide a guide on your potential borrowing amount.

This information allows you to plan in detail and ensures you are prepared when applying for a mortgage. It’s important to note that the figure provided by our Buy-to-Let mortgage calculator isn’t exact, as the amount can vary between lenders. Therefore, it’s best to discuss your situation with an expert mortgage advisor.

Assessing affordability is crucial for lenders for two primary reasons. Firstly, it provides them with an essential indication of how much you can afford to borrow, considering that you’ll need to repay them over time. Additionally, it serves as a measure of how profitable your Buy-to-Let property is expected to be, as the rental income is often utilised to cover mortgage payments to the lender.

While residential mortgages typically assess income and outgoings during the affordability assessment, Buy-to-Let mortgage affordability criteria differ slightly. Lenders still consider your income and outgoings, but they also factor in projected rental income. Since interest payments are part of the equation, the rental income should exceed the mortgage interest by a specified margin.

Usually, lenders require the rental income to be anywhere from 125% to 145% of the mortgage interest payment, assuming an interest rate between 5% and 5.5%. It’s advisable to be prepared for higher rates, especially when applying for an HMO Buy-to-Let.

During their assessments, lenders always conduct a stress test to ensure that you can make payments even if interest rates rise. However, if you opt for a fixed-rate mortgage for five years or more, calculations are based on the following:

  • A hike of at least 2% above current rates.
  • Market projections of future interest rates.
  • A minimum stress-test rate of 5% – 5.5%.

You can use our buy-t0-let mortgage calculator to gain an understanding of your borrowing potential.

If you have a property in mind, then you are likely to have an idea of how much rent you will charge. However, lenders won’t take your word for it. Therefore, they will use a surveyor to calculate this based on things such as the property value, market rates and location.

Lenders will also consider any void periods that may arise during ownership to keep things as realistic as possible. Typically, they assume there will be no tenants in the property one month out of the year.

During their affordability calculations, lenders may also factor in property-related expenditure, deducting it from the rental income. This can be costs such as letting agent fees, insurance, safety check costs and any maintenance fees.

Finally, an important consideration is the lenders imposed Loan-to-value (LTC) limit. This is set and will put a cap on how much they will lend. A maximum of 75% is very common for most lenders, although some do offer more.

Always remember that lenders will place their products in LTV tiers. Meaning, if you can provide a larger deposit, you are more likely to receive better interest rates.

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Mark Alderton

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Thank you John , not only sorting my mortgage but also assisting my solicitor to close financial issues

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United Kingdom, 1 day ago

Simone Whyte

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I cannot recommend my mortgage broker highly enough. From the very beginning of buying my property, Jordan went above and beyond to make what could have been a very stressful experience feel straightforward and manageable. He was always available to answer my questions, explained everything clearly, kept me informed throughout the process, and genuinely cared about achieving the best possible outcome for me. Nothing was ever too much trouble, and his professionalism, patience, honesty, and dedication gave me complete confidence every step of the way. His exceptional service and willingness to go far beyond what was expected made all the difference, and I am incredibly grateful for everything he did. If you're looking for a knowledgeable, trustworthy, and genuinely caring mortgage broker who truly goes the extra mile, I would recommend him without hesitation.

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Michelle Bates

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Amazing service very knowledgeable and helpful

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Anonymous

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Excellent efficient service from John and great rates.

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Nathan Davis

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John was excellent to work with, he broke everything down so you understood each step of the process. Would highly recommend

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Brogan Jardine

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Jordan was fabulous and very informative, very quick process to move into my new home

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United Kingdom, 2 weeks ago

Mamita Gurung

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⭐⭐⭐⭐⭐ Outstanding service from start to finish! I cannot recommend Mark Gardiner highly enough as a mortgage advisor. From our very first conversation, he took the time to fully understand my financial situation, goals, and concerns, and explained every step of the process in clear, simple terms—no confusing jargon at all. Mark went above and beyond to find the best possible mortgage deal tailored exactly to my needs, comparing options thoroughly and always keeping me updated with regular progress reports. He was incredibly responsive, patient, and proactive throughout, anticipating potential issues and resolving them quickly to keep everything on track. Thanks to his expertise, attention to detail, and genuine commitment to getting the best outcome for me, what could have been a stressful process felt smooth and straightforward. I felt completely confident and well-supported at every stage. If you’re looking for a knowledgeable, trustworthy, and dedicated mortgage advisor, Mark is the person to choose. I would not hesitate to use his services again or recommend him to friends and family.I will definitely use him in the future too. Great work

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United Kingdom, 3 weeks ago

Lisa-Marie Davis

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We were recently supported by John during our house sale and onward purchase. Everything was effortless and we were kept informed in a timely manner. John also supported us with updating our life insurance and even with some complications and delays John was committed to finding us the best deal and ensuring we had everything covered that we needed.

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United Kingdom, 3 weeks ago

Taranjeet Minhas

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I have been using Needham Mortgage centre for the last 15 years and have always received a brilliant and unbiased professional service. Recently introduced them to a work colleague who is a first time buyer and I tell you what, they havent let me down. Will highly recommed them anyone and everyone, all day & everyday!

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United Kingdom, 3 weeks ago

Lauren Bell

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John was absolutely amazing throughout what turned into quite a lengthy process. He was incredibly patient, kept in regular contact, and made sure we were fully informed every step of the way. His communication and support made a huge difference, and we’re really grateful for everything he did for us.

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