A Let-to-Buy Strategy That Balanced Tax, Stamp Dutyand Long-Term Planning

Client Profile (Summary)

• Young professional couple based in the UK
• Both higher-rate taxpayers
• One client an IT contractor operating via a limited company
• Growing family with long-term inheritance plans
• Owner-occupiers planning a let-to-buy move

The Starting Point

The clients approached WIS Mortgages to explore a let-to-buy arrangement.

Their initial objective was simple:

• Convert their existing home into a buy-to-let
• Purchase a new family home
• Secure the lowest possible interest rate
• Hold the buy-to-let property personally

At the outset, there was no intention to use a limited company.

On the surface, a personal buy-to-let mortgage appeared attractive because the interest rate was lower than limited company options.

The Risk We Identified

Both clients were higher-rate taxpayers.

Once rental income was added to their personal income:

• Section 24 would restrict mortgage interest relief
• Net rental income would be taxed more heavily
• Long-term cash flow would deteriorate despite a lower rate

Rather than proceeding on assumptions, we carried out a detailed break-even analysis, comparing:

• Personal ownership vs limited company ownership
• Interest costs
• Tax exposure over time
• Stamp Duty implications
• Long-term family and portfolio plans

This analysis showed that although the personal mortgage rate was lower, the overall long-term position was weaker.

The Strategy We Put in Place

This case required multiple elements working together.

1. Limited Company for the Buy-to-Let

The existing property was transferred into a newly formed property company.

• Some Stamp Duty was payable on the transfer
• The cost was manageable in this case
• Long-term tax efficiency outweighed the upfront cost

2. Stamp Duty Advantage on the New Home

Because the original property was moved into the company:

• The purchase of the new home qualified as a home mover
• The higher-rate Stamp Duty surcharge did not apply to the new purchase

This resulted in a meaningful upfront saving.

3. Using an Existing Trading Company Efficiently

One client operated as an IT contractor through a limited company that had retained profits.

Rather than extracting funds personally and triggering additional tax:

• A company-to-company loan was structured
• One company lent funds to the property company
• This allowed capital to be deployed efficiently

4. Larger Deposits and Improved Affordability

By combining:

• Funds released from the property transfer
• Inter-company lending

The clients were able to:

• Put down a larger deposit on the new family home
• Improve overall affordability
• Strengthen their financial position

5. Future Inheritance Planning

As a young family, long-term planning was important.

An ABCC share structure was introduced to:

• Allow flexibility in future dividend planning
• Support passing assets to children when appropriate
• Avoid the need for restructuring later

The Outcome

Although the limited company buy-to-let mortgage carried a higher interest rate:

• The overall tax position improved significantly
• Stamp Duty exposure was reduced
• Cash flow was stronger over the long term
• Capital was accessed without unnecessary tax
• The structure aligned with 10–20 year family goals

The solution was not about chasing the lowest rate, but about achieving the best overall outcome.

Key Findings

• A lower interest rate does not always mean higher profitability
• Section 24 can materially change long-term returns
• Limited company structures can reduce overall tax exposure
• Stamp Duty planning can affect affordability significantly
• Inter-company lending can improve capital efficiency
• Long-term planning matters more than short-term savings

Frequently Asked Questions (FAQs)

Was a limited company necessary in this case?

Yes. The break-even analysis showed that personal ownership would have been less efficient over time.

Did the clients pay Stamp Duty twice?

Stamp Duty was payable on the transfer of the existing property, but the new home avoided the higher-rate surcharge.

Is this type of structure suitable for everyone?

No. It depends on tax position, income, future plans and individual circumstances.

Can trading companies lend to property companies?

Yes, but this must be structured correctly and assessed carefully.

Is a higher interest rate always worse?

Not necessarily. Once tax is considered, a higher rate can still deliver a better net outcome.

Do all lenders accept these structures?

No. Lender choice depends on structure, SIC codes and overall risk profile.

Final Thought

This case demonstrates why rate-only advice can be misleading, particularly for higher-rate taxpayers.

A mortgage is not just a transaction.

It is part of a wider financial strategy.

At WIS Mortgages, we ensure mortgage advice and tax planning work together, so decisions remain effective long after completion.

Your home or property may be repossessed if you do not keep up repayments on your mortgage.