Summer often brings new listings, sharper yields and motivated sellers. If you are eyeing a buy-to-let purchase, getting the fundamentals straight can save time and help you position your case well with lenders. This guide sets out how deposits work, what lenders mean by rent cover, who is typically eligible, and the documents and property standards most expect.
We also touch on SPV limited companies versus buying in your own name, how valuations and down-valuations affect borrowing, and what your options are if the rent is borderline. Throughout, the focus is practical and compliant so you can plan with confidence and avoid surprises.
If you want support from a local mortgage adviser, you can speak with a mortgage broker in Essex through We Do Mortgages. The team handles lender presentation and can coordinate portfolio timelines if you own multiple properties.
How deposits shape your buy-to-let options
For mainstream buy-to-let, a 25% deposit is common. Some lenders will consider 20% with the right case profile, while a 40% deposit can improve product choice and pricing. Higher deposits reduce the loan-to-value (LTV), which usually helps with both the rate and the rent stress calculation.
Key points to keep in mind:
- Below 25% deposit, expect a thinner panel and tighter criteria.
- At 25% to 35%, options may improve.
- At 40% and lower LTVs, pricing and fees can be more favourable.
Gifted deposits are possible with some lenders, but they have rules on who can gift and the evidence required. If you are using a remortgage or further advance on another property to raise the deposit, timing and any Early repayment charges on that loan matter.
Rent cover and ICR stress tests, explained
Buy-to-let affordability is usually based on rental income rather than salary. Lenders apply an Interest Coverage Ratio (ICR) test to ensure the rent covers the mortgage interest at a stressed rate.
- Typical ICR bands run from 125% to 145%.
- The stressed rate varies by lender and product type, often based on a higher notional interest rate than the pay rate.
- Your tax status can change the target. Basic-rate taxpayers often see 125% tests, while higher or additional-rate taxpayers can face 145% or a higher calculation.
Example in plain English: if a lender stresses your interest at a notional monthly figure of £800 and wants 145% cover, they need to see at least £1,160 in monthly rent for that calculation to pass. Figures are illustrative and vary by lender and product.
Products with higher arrangement fees can sometimes ease the stress calculation because the pay rate may be lower, but the total cost over the deal period needs to be weighed carefully. An adviser can model the trade-off so you are not surprised later.
Who is typically eligible, and what salary is needed?
Lenders usually want applicants to:
- Be at least 18, though many lenders set a minimum of 21, with an upper age cap at end of term.
- Meet any minimum income threshold the lender sets, though this varies and a few lenders have no set minimum. Income is often a backstop to show resilience if the property is vacant.
- Have a clean credit profile, or at least minor, well-explained historic blips.
Experienced landlords generally get broader options. First-time landlords are still possible, especially if you are a homeowner already, but criteria can be tighter.
There is no single salary you must earn for buy-to-let because affordability centres on rent. That said, if your income is modest, a stronger deposit and cleaner credit file become more important.
SPV limited company or personal ownership?
Many investors use a Special Purpose Vehicle (SPV), typically a limited company set up with standard property letting SIC codes. Others buy in their personal names. Lenders can assess these routes differently:
- SPV routes often have rental stress tests aligned to company tax treatment, which can help some higher-rate taxpayers meet ICR hurdles. This does not guarantee acceptance, but it can widen lender choice for specific profiles.
- Documentation for an SPV includes incorporation details, shareholder information and company banking. Personal routes lean more on personal income and credit checks.
- Pricing, product fees and legal costs can differ by route. We Do Mortgages does not provide tax advice, so it is sensible to speak to an accountant before deciding.
What documents and property standards do lenders expect?
Be ready with:
- ID, proof of address and bank statements.
- Payslips, SA302s and tax year overviews for self-employed income.
- Existing mortgage statements if you own property.
- A basic property schedule if you hold a portfolio.
Property standards normally include:
- An Energy Performance Certificate (EPC) that meets current legal letting requirements.
- Safety certificates such as Gas Safety and Electrical Installation Condition Reports where applicable.
- Tenancy documentation that fits lender expectations if the property is already let.
Some lenders offer products linked to EPC ratings. For an overview of EPC-linked options and how improvements can influence products, the team can talk through scenarios case by case.
Valuations, down-valuations and what to do next
The lender’s valuation confirms their view of market value and, for buy-to-let, a rental assessment. If the valuation comes back lower than expected, your LTV calculation changes. That can reduce the maximum loan, alter pricing, or both. Common next steps include:
- Renegotiating the purchase price with evidence from the valuation.
- Increasing the deposit to restore your target LTV.
- Exploring alternative lenders or products with criteria that suit the revised numbers.
If the rental figure is lower than anticipated, the ICR may fail at your chosen LTV. Options can include a bigger deposit, a different product with a more favourable stress basis, or presenting a realistic plan for improvements that could support a re-inspection where appropriate.
Is buy-to-let “worth it” in today’s market?
It depends on yield, costs and your time horizon. Investors typically run numbers on net yield after mortgage interest, management, maintenance, voids and tax. Capital growth is uncertain and varies by area. A steady, sensibly geared portfolio can still work for patient investors, but it is rarely a set-and-forget decision. If you want a balanced, unbiased and comprehensive view, speak to an advisor who will map the numbers to your real plans.
How We Do Mortgages supports investors
We Do Mortgages helps investors prepare clean, complete cases that fit current criteria. Practical help includes:
- Lender presentation that clearly sets out your deposit source, rental evidence and ICR position.
- SPV or personal-route guidance at a high level, with signposting to accountants for tax input.
- Portfolio coordination, including spreadsheets with loans, rents, values and product end dates.
- Handling valuation outcomes, including modeling revised LTVs and next steps.
If you are comparing local support options, you can speak with a mortgage broker Southend through We Do Mortgages or start with a quick sense-check online. For stamp duty planning on an additional property, try the firm’s stamp duty calculator to estimate costs before you offer.
Internal links that may help:
- Explore buy-to-let options and lender approaches to investment properties on the We Do Mortgages site at their page on mortgage lenders for investment properties.
- Estimate purchase taxes with the stamp duty calculator.
Quick FAQ
What is the minimum deposit for a buy-to-let mortgage?
Typically 25%. Some lenders consider 20% with the right profile, while 40% can improve pricing and choice.
Who is eligible for a buy-to-let mortgage?
Applicants who meet age and credit criteria, meeting any minimum income the lender sets, and rental income that passes ICR stress tests. First-time landlords are possible, but criteria can be tighter.
What salary do you need for buy-to-let?
There is no universal figure because affordability is rent-led. Many lenders use a minimum income marker as a backstop. Where one applies, the level varies by lender and some have no set minimum.
Is it worth paying a buy-to-let mortgage?
It can be, if yield, costs and risk tolerance work for your goals. Run the full numbers on interest, management, maintenance, voids and tax, and consider your time horizon.
Can an SPV help pass rental stress tests?
It can in some cases because company assessments and tax treatment can lead to different ICR targets or calculations. It is not a guarantee. Get advice and tax input before choosing your route.
Summary and next step
A strong buy-to-let plan usually combines a realistic deposit, a rent that comfortably clears ICR bands, and orderly documentation. Higher deposits tend to improve pricing and make stress tests easier. If a valuation or rent comes in light, you still have options, from renegotiation to deposit tweaks or alternative products.
If you want support from a local mortgage adviser, you can speak with a mortgage broker in Essex through We Do Mortgages. The team can model your ICR, prepare lender-ready documents and coordinate timelines across a portfolio so you can move with confidence.
Your property may be repossessed if you do not keep up repayments on your mortgage or any other debt secured on it. We Do Mortgages Ltd is an appointed representative of Sesame Ltd which is authorised and regulated by the Financial Conduct Authority. The FCA does not regulate some forms of tax planning and buy to let mortgages.
