Tax is the single largest variable in rental property investment that landlords can actually influence. The difference between a well-structured portfolio and a poorly structured one — same properties, same rents, same growth — can amount to tens of thousands of pounds per year and hundreds of thousands over a decade. Understanding the tax landscape is not optional for a serious portfolio landlord. This guide covers every tax you will encounter as a UK landlord, with worked examples and the decisions that affect each one.
Tax rules change regularly. This guide reflects the position as of June 2025 but should not be relied upon as professional tax advice. Always work with a specialist property accountant before making structural decisions. The cost of proper advice is trivially small relative to the sums involved in a portfolio of any scale.
Income tax on rental profits
Rental income is subject to UK Income Tax. For individual landlords, rental profit — income minus allowable expenses — is added to all other income and taxed at the marginal rate. This means a landlord who already earns a salary above the higher-rate threshold (£50,270 in 2025/26) pays 40% on every pound of rental profit.
| Income band | Rate | On rental profit from |
|---|---|---|
| £0–£12,570 (personal allowance) | 0% | First portion — no tax if total income below personal allowance |
| £12,571–£50,270 | 20% | Basic-rate band — 20p in every £1 of rental profit here |
| £50,271–£125,140 | 40% | Higher-rate band — most employed professionals with any rental income land here |
| £100,000–£125,140 | Effective 60% | Personal allowance withdrawal trap — £2 of allowance lost for every £1 earned above £100k |
| Over £125,140 | 45% | Additional rate |
Section 24 — the mortgage interest restriction
Before 2017, individual landlords could deduct all mortgage interest from rental income before calculating tax. Section 24 (Finance Act 2015) phased out this relief over four years, and it has been fully implemented since April 2020. Individual landlords now receive only a 20% tax credit on mortgage interest — not a full deduction.
Property: £220,000 value, 75% LTV IO mortgage at 5.2% = £8,580/year interest. Annual rent: £13,800. Other allowable expenses: £3,200.
Section 24 costs this landlord £1,716/year extra in tax on a single property. Across five similar properties: £8,580/year. This is why the personal-name investment case has deteriorated so significantly for higher-rate taxpayers.
Limited company tax treatment
A Special Purpose Vehicle (SPV) limited company holding rental properties pays Corporation Tax rather than Income Tax on profits. As of April 2023, the main Corporation Tax rate is 25% on profits above £50,000, with a small profits rate of 19% on profits up to £50,000 and marginal relief between.
Critically, a limited company can deduct the full mortgage interest cost as a business expense — Section 24 does not apply to companies. This is the primary tax reason for the dramatic shift toward corporate ownership of BTL properties.
Same property as above: £13,800 income, £8,580 interest, £3,200 expenses. Higher-rate taxpayer.
*19% small profits rate applies at this profit level. The company retains £1,636 vs the personal landlord's £1,076 — a 52% improvement in retained profit on a single property. Across a 5-property portfolio: approximately £2,800/year more retained for reinvestment.
Extracting profit from a limited company
Profit retained in the company is taxed at corporation tax rates only. But to access that profit personally, the director must extract it — and extraction is taxable. The main methods:
| Method | Rate | Best for | Trade-off |
|---|---|---|---|
| Director's salary | Income tax + NI (up to 45%) | Small amounts up to NI threshold | Most tax-efficient salary: £12,570/yr (below NI, uses personal allowance). Above this, expensive. |
| Dividends | 8.75% (basic rate) / 33.75% (higher rate) | Regular income extraction after corporation tax | £500 dividend allowance in 2025/26. Higher-rate: combined corp tax + dividend = ~50% effective rate. |
| Pension contributions | 0% up to annual allowance | Long-term wealth building | Annual allowance £60,000. Company contributions fully deductible. Highly tax-efficient. |
| Loan repayment | 0% (if genuine director's loan) | Repaying capital already invested | Can only repay genuine loans already made to the company — not a way to extract profit. |
| Leave in company | Corporation tax only | Reinvesting in more properties | No extraction tax — best option for growing the portfolio. Funds next deposit from retained profits. |
The real advantage of the limited company structure for portfolio builders is not what happens when you extract profit — it is what happens when you don't. Retaining profits in a company and using them as deposits for the next property means 75–81p of every £1 of profit is available for reinvestment. Personally, only 60p (after 40% income tax) is available. Over a decade, this compounding difference is substantial.
Capital Gains Tax on property sales
When a UK residential property is sold at a gain, Capital Gains Tax applies to the profit above the acquisition cost. The CGT rates on residential property (from October 2024) are:
| Taxpayer status | CGT rate (residential property) |
|---|---|
| Basic-rate taxpayer | 18% |
| Higher or additional-rate taxpayer | 24% |
| Limited company | Corporation tax (19–25%) — no separate CGT |
CGT annual exemption
The CGT annual exemption has been reduced significantly — it stood at £12,300 in 2022/23, was cut to £6,000 in 2023/24, and further to £3,000 in 2024/25 and 2025/26. On a property with a £60,000 gain, the exemption shelters £3,000 — reducing the taxable gain to £57,000. At 24%, CGT is £13,680.
Allowable deductions from the gain
The taxable gain is the sale price minus: original purchase price, buying costs (SDLT, legal fees, survey), selling costs (agent fee, legal fees), and capital improvements (not repairs — see the distinction below). Proper record-keeping of all these costs over the holding period can meaningfully reduce the CGT liability.
The 60-day CGT reporting rule
Since April 2020, landlords who sell a UK residential property must report and pay any CGT due within 60 days of completion. This is a distinct requirement from the Self Assessment tax return — missing the 60-day deadline triggers penalties. Use a specialist accountant to ensure timely reporting.
Stamp Duty Land Tax
SDLT is payable on purchase and is a significant upfront cost. For buy-to-let and second properties (including all properties bought through a limited company), the standard SDLT rates have a 5 percentage point surcharge applied on top of the residential bands (raised from 3% on 31 October 2024):
| Property price band | Standard SDLT rate | Additional property rate (+5%) |
|---|---|---|
| £0–£125,000 | 0% | 5% |
| £125,001–£250,000 | 2% | 7% |
| £250,001–£925,000 | 5% | 10% |
| £925,001–£1.5m | 10% | 15% |
| Over £1.5m | 12% | 17% |
For a £285,000 BTL purchase: SDLT = (£125,000 × 5%) + (£125,000 × 7%) + (£35,000 × 10%) = £6,250 + £8,750 + £3,500 = £18,500. This is not deductible against rental income but does reduce the taxable CGT gain on eventual sale (it is a buying cost).
Allowable deductions — what you can claim
Full deduction for limited companies. Personal landlords receive 20% credit only (Section 24).
Management fees, letting fees, renewal fees — all deductible as revenue expenditure.
Work restoring the property to its original condition. Not improvements that add new value — those are capital expenditure.
Buildings insurance, landlord liability insurance, rent guarantee insurance — all deductible.
Accountancy, tax advice, legal fees for tenancy agreements, RICS valuations for tax purposes.
Any service charges, ground rent, and utilities paid by the landlord are deductible.
HMO licence fees, selective licensing registration fees, compliance certification costs.
Extensions, loft conversions, new kitchen upgrades, double glazing installation. Reduces CGT on sale but cannot be offset against rental income.
Deductible repair: Replacing a broken boiler with an equivalent boiler. Repainting the interior. Replacing damaged flooring like-for-like. Fixing a leaking roof. These restore the property to its previous condition.
Non-deductible improvement: Replacing a basic kitchen with a high-specification fitted kitchen. Installing central heating where there was none before. Adding an en-suite to a bedroom that didn't have one. Converting a garage into a room. These add value beyond the original state.
Replacement of domestic items relief: For furnished rental properties, landlords can claim a deduction for the cost of replacing domestic items (beds, sofas, white goods) like-for-like. The relief is for the replacement cost, not an upgrade — replacing a basic fridge with a premium fridge only qualifies for the basic fridge cost.
Four tax planning decisions that matter most
1. Structure before you buy — not after
The decision between personal and limited company ownership must be made before purchase. Transferring existing personally-held properties into a company triggers SDLT at additional property rates and potentially CGT on the accumulated gain — costs that typically outweigh the future tax savings. Start new acquisitions in the right structure from day one.
2. Timing property sales around CGT allowances
Each individual has a £3,000 annual CGT exemption (2025/26). A couple each selling a jointly-held property can use both exemptions: £6,000 combined. Selling in April (start of a new tax year) rather than March (end of a tax year) can provide a full additional year's exemption. Where total gains exceed the exemption, consider spreading sales across tax years to keep each year's gain within efficient tax bands.
3. Pension contributions as tax-efficient extraction
For limited company landlords, employer pension contributions are deductible as a business expense, reducing corporation tax, and are received by the director free of income tax (up to the annual allowance of £60,000). A company contributing £20,000/year to a director's pension saves £5,000 in corporation tax (25%) and the director receives the full £20,000 in the pension — versus paying a salary of £20,000 subject to income tax and NI.
4. Record-keeping for CGT reduction
Every pound spent on capital improvements reduces the taxable CGT gain on eventual sale. A £15,000 loft conversion on a property sold 15 years later with a £90,000 gain reduces the taxable gain to £75,000 — saving £3,600 in CGT at 24%. Keeping receipts and records for all capital expenditure over the entire holding period is essential.
Frequently asked questions
Do I need to complete a Self Assessment tax return as a landlord?
Yes, in almost all cases. If your rental income exceeds £1,000 in a tax year (the property income allowance threshold), you must register for Self Assessment and complete an annual tax return. For portfolio landlords with multiple properties, the Self Assessment return reports all rental income and expenses, any other income sources, CGT on property sales in that year, and any tax reliefs claimed. The deadline for online Self Assessment submission is 31 January following the end of the tax year (so for the 2024/25 tax year ending 5 April 2025, the deadline is 31 January 2026).
What happens to my personally-held BTL properties when I die?
Residential investment properties are subject to Inheritance Tax (IHT) as part of your estate at 40% above the nil-rate band (currently £325,000 per individual, plus a possible £175,000 residence nil-rate band if you own your own home). Unlike business assets, rental properties do not qualify for Business Property Relief (which would exempt them from IHT). A portfolio of five properties worth £1.5m in total could generate an IHT liability of approximately £470,000 for beneficiaries if no planning is done.
Limited company shares can, in some circumstances, qualify for Business Property Relief — making the corporate structure potentially advantageous for IHT planning as well as income tax. However, the conditions for BPR on property companies are complex and the rules have been subject to review. This area requires specialist advice.
Can I transfer my personally-held properties to a limited company?
Yes, but it is rarely worth it for established portfolios due to the transfer costs. Transferring a property to a company is treated as a sale at market value — triggering SDLT at additional property rates on the purchase price and CGT on the accumulated gain above the original purchase price. On a property bought for £180,000 now worth £280,000 with a £100,000 gain: SDLT of approximately £18,000 and CGT of £24,000 (at 24%) = £42,000 in transfer costs. These must be weighed against the future tax savings from the corporate structure — which typically means the break-even is 8–12 years for a single property.
Practical alternatives: don't transfer existing properties (the structure is effectively permanent), but direct all new acquisitions into a company. Over time, the corporate share of the portfolio grows and the personal share reduces through natural tenure end and planned disposal.
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