Islay Robinson explains how prepaid mortgages help high-net-worth borrowers with substantial wealth but limited taxable income release property liquidity.

A borrower wants to release £2M against a London property.

Net worth sits comfortably into eight figures. Wealth is substantial. Assets are strong.

Taxable UK income, however, is a fraction of what a conventional affordability model would want to see for a loan of that size.

On paper, the mortgage does not work.

In practice, it works extremely well.

This is one of the most common situations specialist lenders are asked to solve, and one of the least understood.

The borrower is not short of money.

They are short of the particular kind of income that traditional mortgage underwriting rewards.

There is a structure built specifically for this problem.

It is called a prepaid mortgage.

For the right borrower, it is efficient, flexible, and often significantly cheaper than people expect.

The problem with “income” at the top of the market

Traditional affordability models were built around salaried borrowers.

Regular monthly salary.
Predictable income.
Simple payslips.

That describes very few borrowers buying or refinancing £3M to £20M property.

The reality at this level looks very different.

You see:

• Entrepreneurs building companies and drawing modest salaries
• Founders waiting for business exits or earn-out payments
• Private equity professionals with significant unrealised carry
• Investors with wealth held in portfolios, ETFs, pensions, or listed securities
• High-net-worth individuals who are simply cash-rich and income-poor

These borrowers often have more than enough wealth to buy property outright.

The issue is not whether they can afford the borrowing.

The issue is whether they should be forced to liquidate assets, trigger tax events, or disrupt working capital simply because a standard affordability model cannot interpret the shape of their balance sheet.

Usually, the answer is no.

How a prepaid mortgage works

The mechanics are straightforward.

A mortgage is typically structured at around 65–70% loan-to-value on an interest-only basis over two, three, or four years.

Instead of making mortgage payments from monthly income, the borrower prepays the interest for the agreed term upfront.

The total interest cost is calculated at completion based on:

• Loan amount
• Interest rate
• Loan term

That sum is then placed with the lending bank in an interest-bearing deposit account.

Each month, the mortgage payment is deducted from that account and used to service the loan.

The mortgage is still being serviced in the usual way.

The difference is simply that the payments are funded upfront rather than from monthly earnings.

What it actually costs

This is where many borrowers misunderstand the structure.

The true cost is not the headline mortgage rate.

The prepaid interest remains in deposit accounts earning interest throughout the term, offsetting a meaningful portion of the borrowing cost.

In practical terms, the borrower’s real cost is often the spread between:

• The mortgage rate charged
• The deposit rate earned

That is a very different proposition from paying the full cost of borrowing with no offset.

This is why prepaid mortgages are often much more cost-effective than they initially appear.

Who it suits best

This structure works particularly well for borrowers expecting a future liquidity event.

Examples include:

• Sale of a business
• Completion of an earn-out
• Property sale
• Deferred investment distributions
• Pension income beginning

The structure allows borrowers to access capital today while preserving assets they would rather keep invested.

For many borrowers, that flexibility is extremely valuable.

Rather than choosing between selling assets or abandoning the borrowing, the prepaid mortgage allows them to do neither.

The hybrid structure

The solution does not need to be all or nothing.

Where a borrower has some provable income, part of the loan can be serviced conventionally and part prepaid.

For example, a borrower requiring £2M may structure:

• £1M as a standard mortgage serviced monthly from income
• £1M as a prepaid mortgage

This hybrid approach allows the structure to be tailored around the borrower’s balance sheet rather than the limitations of a standard affordability model.

What this is, and what it is not

A prepaid mortgage is not a way to borrow money a client cannot afford.

It is the opposite.

It is a way of structuring borrowing around wealth that already exists but is not reflected in conventional income.

The borrower has the means.

The structure simply arranges those means into a form the lender can underwrite.

It will not suit everyone.

But for entrepreneurs, founders, investors, and private equity professionals with strong balance sheets and future liquidity, it can be one of the most effective borrowing structures available.

The key point

The mortgage market often focuses too heavily on income and not enough on wealth.

For sophisticated borrowers, that creates obvious gaps.

The prepaid mortgage fills one of the most useful.

It allows asset-rich borrowers with unconventional income profiles to unlock liquidity without disturbing the assets that created that wealth in the first place.

Done correctly, it turns a balance sheet that looks difficult on paper into a straightforward lending case.

Disclaimer

This article is for general information only and does not constitute financial, mortgage, tax, legal, or investment advice. The views expressed are those of the author and are provided for illustrative and educational purposes only.

Any lending structures, terms, rates, loan-to-value ratios, or examples referenced are indicative only, subject to change, and do not constitute an offer, recommendation, or quotation. Availability of products and lending terms will depend on individual circumstances, asset profile, property type, jurisdiction, market conditions, and lender underwriting criteria.

Enness Global acts as a broker and not as a lender. All finance is subject to status, valuation, underwriting, and lender approval. Not all applications will be successful, and outcomes are not indicative of future results.

Property values can fall as well as rise, and you may not get back the amount originally invested. Borrowing against property carries risk.

Your home or property may be repossessed if you do not keep up repayments on a mortgage or any debt secured against it.

Tax treatment depends on individual circumstances and may change over time. Independent professional advice should always be sought before entering into any financial arrangement.