Portsmouth Property Accountant: Tax Services for Local Landlords

Portsmouth is one of the most tightly regulated rental markets in England, and that regulation feeds directly into how local landlords are taxed. The city operates a citywide Article 4 direction and an additional HMO licensing scheme, alongside a strong University of Portsmouth student-let market. Layer on Section 24, Making Tax Digital from April 2026, and the separate property income tax rates that arrive in April 2027, and the tax position for a Portsmouth landlord is now genuinely complex.

This guide explains what a specialist property accountant does for Portsmouth investors, the local rules that shape tax planning here, and the national changes every landlord in the city needs to be ready for.

Portsmouth's rental market and why local context matters

Portsmouth packs a dense, varied rental stock into a compact island city. Victorian and Edwardian terraces dominate Southsea and the central districts, with later developments around Gunwharf Quays and a steady supply of student-friendly housing close to the University of Portsmouth. That mix produces a wide range of tax situations: single buy-to-lets, multi-let HMOs, former holiday lets along the seafront, and growing portfolios.

Two local features set Portsmouth apart from most of England. First, the citywide Article 4 direction means planning permission is required to convert a family home (use class C3) into a small HMO (use class C4) anywhere in the city. In most of the country that change is permitted development. Second, Portsmouth runs an additional HMO licensing scheme that, since 1 September 2023, brings smaller HMOs occupied by three or four tenants into licensing, on top of the national mandatory regime for larger HMOs. You should always confirm a specific property's status with Portsmouth City Council, but these controls mean HMO investment here involves more upfront planning, and more tax decisions, than in less regulated areas.

What a specialist property accountant does for Portsmouth landlords

A property specialist focuses on the issues that recur for landlords rather than the general bookkeeping a high-street firm handles. For Portsmouth investors that typically includes:

• Calculating rental profit correctly, with proper treatment of allowable costs and the repair-versus-improvement distinction that matters so much on older terraced stock.
• Applying Section 24 and the 20% finance-cost credit accurately across a portfolio.
• Getting landlords ready for Making Tax Digital, including software choice and quarterly record-keeping.
• Reviewing ownership structure, including whether incorporation makes sense given the April 2027 rate changes.
• Planning capital gains tax ahead of a sale, including the 60-day reporting deadline.
• Confirming the tax treatment of HMO licensing and conversion costs under Portsmouth's local rules.

If you are weighing up whether specialist support is worth it, our guide on what a property accountant does sets out the difference in practical terms, and our overview of how property accountants are typically engaged explains how the relationship usually works.

Section 24: the mortgage interest restriction

Section 24 is fully in force and affects most mortgaged Portsmouth landlords. Finance costs, principally mortgage interest, are no longer deducted from rental profit. Instead you get a 20% basic-rate tax credit against your overall income tax liability.

For a higher-rate taxpayer this is a meaningful difference. Consider a Portsmouth landlord earning a salary plus rental profit from a small mortgaged portfolio. Because the full rent now counts toward total income before the finance-cost credit is applied, that landlord can end up paying tax at a higher rate on income that does not match the cash actually left after interest. Landlords who bought at higher loan-to-value ratios feel this most. The restriction can also push total income past the £100,000 personal-allowance taper, creating an effective marginal rate of around 60% on a slice of income.

Section 24 also now applies to former furnished holiday lets, because that regime was abolished from 6 April 2025. Our complete guide to Section 24 works through the mechanics and the planning options in detail.

Making Tax Digital: live from April 2026

Making Tax Digital for Income Tax is no longer on the horizon, it is here. The phased thresholds are:

• From 6 April 2026: mandatory for landlords and sole traders with qualifying income above £50,000.
• From 6 April 2027: threshold drops to £30,000.
• From 6 April 2028: threshold drops to £20,000.

Qualifying income is gross income before expenses, and jointly owned property is tested against each owner's share, not the property's total. In practice many Portsmouth landlords cross the threshold once they add a second or third property, especially given local rents. MTD means digital record-keeping and quarterly updates to HMRC, replacing the single annual self-assessment cycle for those in scope. Landlords still relying on spreadsheets or paper records should plan the transition now rather than close to a deadline. Our guide on Making Tax Digital for landlords covers the practical steps.

The April 2027 property income tax rates

From 6 April 2027 property income will be taxed at its own rates, separate from other income. The Finance Act 2026 introduced these rates for England, Wales and Northern Ireland: a 22% basic rate, a 42% higher rate, and a 47% additional rate. This is enacted law, so it should be built into planning now rather than treated as speculation.

For Portsmouth landlords with growing portfolios, the change sharpens a question many were already asking: is it better to hold property personally or through a limited company? Companies pay corporation tax (19% on profits up to £50,000, rising toward 25% above £250,000) and deduct mortgage interest in full, which the new personal rates make more attractive on paper. But incorporation has real costs and consequences, including potential CGT and stamp duty on transferring existing properties, and it is not automatically the right move. Our guide to buy-to-let limited companies sets out the trade-offs so you can see where the line falls for your portfolio.

Capital gains tax when you sell

When a Portsmouth landlord sells a residential rental property, capital gains tax is charged at 18% on gains within the basic-rate band and 24% above it. Each individual has a £3,000 annual exempt amount. Where tax is due, UK residents must report and pay within 60 days of completion through HMRC's UK Property service, and missing that deadline triggers penalties.

Several factors can change the outcome: how the property is owned, whether a spouse or civil partner is involved (transfers between them happen with no gain and no loss), and the timing of a disposal relative to the tax year and your other income. For Portsmouth investors holding properties bought years ago in fast-appreciating central areas, the gains can be substantial, so planning ahead of a sale rather than after it is where the value lies.

HMOs and student lets in Portsmouth

HMOs are central to the Portsmouth market, particularly the student housing supported by the University of Portsmouth and concentrated in Southsea and the central districts. They are also where the local rules bite hardest. Because of the citywide Article 4 direction, every new HMO needs planning permission, and the additional licensing scheme brings smaller three-to-four-tenant HMOs into licensing alongside the mandatory regime for larger properties.

The tax angles follow from this. Licence application and renewal costs, professional fees, and the correct capital-versus-revenue split on conversion and refurbishment works all need careful treatment. HMO landlords also face decisions on council tax, fire-safety compliance, and whether incorporation suits a multi-let model. Getting these right at the outset, rather than unpicking them later, is exactly where a specialist earns their place.

Furnished holiday lets after April 2025

Portsmouth and Southsea's seafront supported a number of short-term and holiday lets. The furnished holiday lettings regime was abolished from 6 April 2025, so those properties are now taxed as standard residential lettings. Section 24 applies to their finance costs, the old capital allowances treatment and Business Asset Disposal Relief on sale no longer apply, and the income forms part of the ordinary property business. Any landlord who structured around the holiday-let rules should review their position, because the assumptions behind that structure have changed.

Choosing a property accountant in Portsmouth

Look for genuine property experience rather than general practice credentials. The right adviser should be comfortable talking through Section 24 planning, MTD readiness, incorporation analysis, and CGT on disposal, and should understand how Portsmouth's Article 4 and licensing rules interact with the tax treatment of HMO costs. Local market knowledge adds real value: an adviser who understands Southsea terraces, student lets near the university, and the city's HMO controls can give more relevant advice than a generalist working from a distance.

Property Tax Partners connects Portsmouth landlords with specialist property accountants who work with these issues every day. For broader context on planning across a portfolio, our complete guide to property investment tax brings the national rules together in one place.