Buy-to-Let and Limited Company Mortgages for Iranian Investors in the UK

Personal name or limited company?

One of the first investment decisions is who will own the property. There are two common routes.

Neither is automatically better. The right answer depends on your income, other assets, plans for more properties and tax residency. That is a matter for a qualified accountant or tax adviser. Our role is to explain the property side and coordinate introductions. We can help with the practical setup of a limited company, such as incorporation, director structure and SIC code, and then coordinate the professionals who advise on tax and finance.

How buy-to-let lenders assess an application

Buy-to-let lending is judged mostly on the property’s ability to pay for itself, but lenders still look at you.

• Rental cover (stress test). Lenders check that expected rent covers the mortgage interest by a set margin at a stressed interest rate. This sets the maximum loan more than your salary does.
• Loan-to-value. Typical buy-to-let maximums are lower than residential, and lower again for overseas or complex applicants.
• Your status and income. Many lenders want UK residency or a minimum income. Others cater to overseas landlords.
• Experience. A track record as a landlord helps. First-time landlords may face tighter terms.
• The property. Standard construction, a sensible location and a letting-friendly layout help. Some flats and unusual builds are limited.
• Source of deposit. This is where overseas buyers meet the strictest checks. Some buy-to-let lenders state clearly that they do not accept gifted deposits from outside the UK, so plan with your broker.

Many lenders also apply the same compliance checks described in our guides on why lenders decline Iranian applicants and source of funds.

The real costs of buying to let

Before you fall for a headline yield, model the full costs:

• Stamp duty. Additional property rates apply, and non-UK residents pay a further 2% surcharge in England and Northern Ireland. See our deposits and stamp duty guide.
• Deposit. Buy-to-let deposits are usually higher than for a home, often 25% or more, and higher for overseas profiles.
• Finance costs. Interest, product and arrangement fees.
• Running costs. Letting or management fees, insurance, repairs, compliance certificates, void periods.
• Tax. On rental profits and later on sale. This depends on how you own the property and your own tax position.

A step-by-step approach for overseas investors

1. Define the goal. Income, growth, or a mix? Hold period? How many properties?
2. Choose the ownership route with an accountant: personal name or limited company.
3. If using a company, incorporate it, appoint directors and open a UK business account. We coordinate the practical steps.
4. Prepare your evidence. Identity, income and source of funds for every deposit and for the company.
5. Plan the funds route. Use a regulated money transfer provider and agree it with broker and solicitor. See our guide.
6. Pick a market and property type. Look at rents, demand, transport and local regulation, and the building’s condition. A technical review of the structure can save a lot.
7. Obtain finance through a broker. Present the case to lenders whose buy-to-let criteria include your profile.
8. Buy, then manage. Arrange legal work, insurance, referencing, tenancy agreements, deposit protection and a managing agent where appropriate.

Refurbishment and development

Some investors prefer to buy a property that needs work and add value. This can improve returns but adds risk: cost overruns, planning issues and delays. Specialist finance exists for refurbishment, with different rules from standard buy-to-let. A civil engineering background, as we have, is useful in judging whether the scope and budget are realistic. If you are interested, say so on your call and we will look at it with you.

An illustrative rental stress test

Buy-to-let lenders typically test that rent covers interest by a margin, often called the interest cover ratio (ICR), commonly in the region of 125% to 145% depending on the lender and borrower type, calculated at a stressed rate. The numbers below are illustrative only.

In this example the rent comfortably passes the test. If expected rent were £800 a month it would fail, and the loan would have to fall or the deposit rise. Your broker will run the lender’s own calculation, which will differ.

Landlord responsibilities to plan for

A rental property comes with legal duties. They change, so check the current requirements on GOV.UK. In general you should expect to deal with:

• Safety certificates (for example gas, electrical and smoke and carbon monoxide alarms) and an energy performance certificate.
• Right to rent checks on tenants in England.
• Protecting tenants’ deposits in an approved scheme and giving them the required information.
• Licensing where a local authority requires it, particularly for houses in multiple occupation.
• Tenancy agreements and notices that comply with current law, which is changing, so use a professional.

Many overseas investors appoint a letting or managing agent to handle these. Check their fees and what they actually do.

A note on tax for overseas landlords

Rental income from UK property is generally part of the UK tax system even if you live elsewhere, and there are specific rules for landlords who live abroad. GOV.UK explains tax on UK income if you live abroad. You may also have obligations in your country of residence. This is outside our remit: please take advice from a qualified accountant or tax adviser, and make that conversation part of the plan before you buy.

How 23rd Homes helps

Our services line up with the investor journey: investment strategy, limited company setup, property sourcing, development and refurbishment input, introductions to FCA-authorised finance brokers and money transfer firms, and full coordination of the professionals involved. For Iranian investors we also help organise the source-of-funds evidence and the transfer route. Book a free 15-minute call to talk through your plan.

Frequently asked questions

This article is general information, written on 11 November 2026. Lender criteria, tax rates and sanctions rules change, so we check the current position with you on your free call.