Preparing Your Holiday-Let Accounts for Refinancing in H2 2026

In short: A substantial volume of UK fixed-rate mortgages come off through 2026-27 and a share are held by STL landlords. The criteria applied on remortgage are tighter than at original drawdown — interest rates are higher, rental stress tests are sharper, and underwriters ask more questions. This piece is the accounts-and-evidence pack an STL operator should assemble before approaching a broker or lender, with named-lender examples of how stress tests differ.

Most STL portfolios in the UK were financed against an easier lending backdrop than the one operators face on remortgage now. This piece walks through the evidence pack.

The stress test — and why STL is different

The rental stress test is the calculation lenders use to determine how much they will lend. Standard buy-to-let stress tests typically run at 5.5% or the product rate plus 2%, whichever is higher, and require the rent to cover 125% of that stressed interest for basic-rate taxpayers or 145% for higher-rate taxpayers.

Holiday-let and short-term-let lenders assess differently — and the assessment is lender-specific. Published examples of specialist criteria at H2 2026 include:

• Cumberland Building Society — holiday-let mortgages — assesses using low-, mid- and high-season weekly rates multiplied by a working season length, applied against the society's own coverage ratio.
• Leeds Building Society — holiday-let lending criteria — uses average weekly rent across seasonal bands with an ICR test at a stressed pay rate.
• Hodge Bank — holiday-let mortgages — publishes seasonal-rate methodology and an ICR-based assessment.
• Suffolk Building Society — holiday-let criteria — assesses seasonal weekly income at a stressed rate.

The common thread is a seasonal-average approach rather than a single 12-month rent × ICR figure, but the working season length, the coverage ratio and the stressed pay rate differ across lenders. Where a specialist STL lender is approached with BTL-style annual-rent figures, the underwriter re-derives the seasonal split; the operator is better placed to present the numbers in the format the lender uses natively.

Two-year fixes on specialist STL mortgages in H2 2026 have generally sat in the mid-5% range, with some five-year fixes a little below. Model at the specific lender's stressed rate, not a headline rate. Where the underwritten loan size does not clear the current balance, the delta is either paid in cash on completion or accepted as a smaller loan (a lower LTV, which typically prices at a lower headline rate but requires the operator to inject equity from cash or from another asset).

What lenders now specifically ask for

Beyond the standard bank statements and personal ID, the evidence pack we now routinely prepare for STL clients includes:

Three years of property-level trading accounts. Not the whole portfolio - each property's own P&L, showing booking income, occupancy, and net trading position. Lenders increasingly want to see the specific unit's performance, not just the portfolio average.

Platform payout statements matched to bookkeeping. Where the accountant can hand over booking-level detail from Airbnb / Booking.com / Vrbo reconciled to the tax return, the file moves faster and the underwriter's questions are shorter.

Post-FHL tax computation. For the 2025/26 tax year, lenders want to see the numbers under the new rules, not the FHL rules. Where the client has not filed 2025/26 yet, an accountant-prepared draft tax computation may be required.

Planning status evidence. This is newer. Lenders are increasingly asking whether the property holds planning permission or a Certificate of Lawfulness for the short-term let use. Where the operator's answer is "no" or "not sure", the application is now more likely to be declined, downgraded, or moved to a higher rate. This is why our sister firm STL Solutions recommends addressing planning status well ahead of any refinance.

Confirmation of licence / registration compliance. Scottish STL licence, Welsh register entry (from October 2026), and English register entry once the scheme commences (definitive commencement date to be checked at time of application — see note below).

The two most common refinancing failures we see

Underestimating how much the accounts need to have said last year. Lenders assess against the last set of finalised accounts, not against the operator's projection of what next year will look like. Where the 2024/25 accounts showed a low profit for legitimate reasons - a bad season, capital investment, a change in cost base - that low profit constrains the loan available now, even if 2025/26 will be better.

Assuming an existing lender will renew automatically. They often will not, particularly where the original underwriting relied on the FHL regime, on lower rates, or on a portfolio position that has since changed. Distinguish a same-lender product transfer from a full remortgage with fresh underwriting — a product transfer typically avoids re-underwriting the borrower and can complete quickly, while a remortgage (whether to a new lender or to a different product on the existing lender's book) will go through a fresh affordability and stress-test assessment. Not every renewal follows the same process; ask the broker which route applies before assembling the pack.

The accountant's role, done properly

A specialist STL accountant supports a refinance in three ways:

1. Preparing the trading accounts pack in a form the lender wants - per-property P&L, reconciled to platform data, aligned to the tax return.
2. Preparing a compliant post-FHL tax computation, with a written note on how the tax profile compares to the last FHL year. Underwriters unfamiliar with the April 2025 FHL abolition sometimes flag the mechanical increase in taxable profit (an individual owner losing full mortgage-interest deduction against a 20% credit) as an "unexplained" divergence between cash performance and tax return. A one-page accountant's note distinguishing cash profit from tax profit prevents this.
3. Speaking to the broker or lender directly on technical questions. Where a lender's underwriter is unsure how to treat the mortgage interest restriction on a Ltd vs sole trader position, a call from the accountant is often faster than a written response through the broker.

What operators should do now

1. Identify when your current fixed rate ends. If it is inside the next 12 months, start the evidence pack now, not three months out.
2. Confirm your lender's specific stress-test methodology — headline market figures move; the number that matters is the lender's own calculation on your specific product and property. For a specific example, see Leeds Building Society's holiday-let lending criteria as one published methodology; do not extrapolate one lender's approach to all lenders.
3. Address any correctable errors or unusual results in the accounts before applying — with a written explanation of what happened rather than a rewrite of what is on the record.
4. Get planning status onto a defensible footing before underwriting. Increasingly a live underwriting question.
5. Speak to a specialist STL accountant well before speaking to the broker. The evidence pack takes time to assemble.

A note on tax vs cash. The mortgage-interest restriction for individuals increases the taxable profit shown on the tax return without changing the cash profit the property produces. This is a common point of confusion in a lender conversation — an operator whose 2025/26 taxable profit is higher than 2024/25 because of the interest restriction may still have the same underlying cash performance. A short accountant's note distinguishing tax profit from cash profit prevents unnecessary underwriter questions.

A note on the English registration date. The March 2027 date for the English STL register has been referenced in various sources but the definitive commencement date should be checked against the current DCMS / DLUHC guidance at the point of application — early references may not reflect the final position.

Book a free consultation.

Sources: FCA — Mortgage market data; UK Finance — Mortgage lending statistics; Leeds Building Society — Holiday let lending criteria (example only); HMRC — Property income mortgage interest relief.