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Impact of Proposed ISA Rules on the Mortgage Market

First-time buyers face losses under proposed ISA rules, complicating the mortgage market further amid rising costs.

By David Sampson
18 August 2026
3 min read
UK first time buyer mortgage article image for Impact of Proposed ISA Rules on the Mortgage Market

TL;DR

  • First-time buyers could lose out under new ISA proposals.
  • 71% believe homeownership will take longer due to financial pressures.

Written by David Sampson for Mortgage118. Last updated 18 August 2026. Reviewed against our editorial standards. Editorial standards. Mortgage118 is a directory — not FCA-authorised and not a mortgage adviser.

First-time buyers in the UK are facing potential losses due to proposed changes to the Lifetime ISA (LISA) rules. These changes could further complicate the already challenging mortgage market for first-time homebuyers, who are grappling with rising costs and limited savings opportunities.

What are the Proposed Changes to ISAs?

The proposed Treasury rules aim to ban transfers from stocks and shares ISAs to cash versions as completion approaches. This move is intended to mitigate risks but leaves deposits vulnerable to market fluctuations, potentially impacting buyers’ ability to secure their homes. The LISA, which allows individuals to save for their first home or retirement with a government bonus on contributions, is at the centre of this debate.

How Will This Affect First-Time Buyers?

First-time buyers are already facing significant hurdles in the current mortgage market. A survey has revealed that a large percentage of these buyers believe that purchasing a home will take longer than anticipated, largely due to the pressures of the cost of living and soaring rent prices. The financial strain is forcing many to delay major life decisions, such as starting a family or saving for retirement.

What Should First-Time Buyers Watch For?

As the proposed changes unfold, first-time buyers should keep a close eye on the government’s decisions regarding the LISA. Moneybox, a financial platform, is advocating for the retention and evolution of the LISA rather than introducing a new product. They suggest two key updates: an annual review of the house price cap to ensure it aligns with market conditions, and a reduction of the withdrawal penalty to ensure that savers do not lose their hard-earned money.

What This Means for First-Time Buyers in the Mortgage Market

The implications of these proposed changes are significant for first-time buyers. The potential loss in compound growth could deter many from saving effectively for their first home. Additionally, the inability to transfer funds safely from stocks and shares ISAs to cash versions could lead to increased anxiety about market volatility, making it harder for buyers to secure necessary deposits. With the current economic climate, these changes could exacerbate the already challenging conditions for those looking to enter the property market.

Frequently asked questions

What is a Lifetime ISA?

A Lifetime ISA (LISA) is a savings account designed to help individuals save for their first home or retirement, offering a government bonus on contributions.

How do proposed ISA changes affect my savings?

The proposed changes could prevent you from transferring funds from stocks and shares ISAs to cash ISAs, leaving your savings exposed to market risks, which may impact your ability to save for a deposit.

About David Sampson

David Sampson writes about the UK mortgage market for Mortgage118, covering specialist lending, market trends, and practical advice for borrowers. All content is reviewed for accuracy against FCA guidelines and current market data.

Impact of Proposed ISA Rules on the Mortgage Market | Mortgage118