National Insurance on rental income — what landlord contractors need to know
Direct Answer
Landlords currently pay no National Insurance on rental income — it is classified as investment income, not earnings. The New Economics Foundation published a proposal in June 2026 to change this, applying Class 4 NI to rental profits and raising an estimated £3.2bn a year. This is not yet law and Labour has not committed to it — but the proposal has genuine policy credibility and contractor landlords should understand what it would mean for their income structure.
How rental income is taxed today
Rental income from a UK property is treated as investment income. Landlords declare it on their self-assessment return and pay income tax on the profit (income minus allowable expenses) at their marginal rate. In 2026/27 the rates are 20%, 40%, or 45% depending on total income.
What landlords do not pay is National Insurance. Class 4 NI applies to self-employment profits — not to rental profits. The distinction matters because Class 4 is currently charged at 6% on profits between £12,570 and £50,270, and 2% above that. A landlord with £30,000 of rental profit saves approximately £1,042 per year compared to what a self-employed trader on the same profits would pay.
Since 2017, the Section 24 rules have also removed the deduction for mortgage interest from rental income, replacing it with a 20% tax credit. This change — championed by the Osborne Treasury — significantly increased the effective tax rate on leveraged rental portfolios. The NEF proposal would add NI on top of that already-increased income tax bill.
The NEF proposal — what is being suggested
The New Economics Foundation (NEF) published its proposal in June 2026. The core argument is that the NI exemption on investment income — including rental income — represents an unfair advantage for asset-owning households over working households who pay NI on every pound of earned income.
The NEF estimates applying NI to rental profits would raise £3.2bn per year. The proposed mechanism is to bring rental profits within Class 4 NI in the same way self-employment profits are currently taxed.
As a partial offset, the NEF proposes reintroducing mortgage interest relief for landlords — removed progressively between 2017 and 2020 and replaced with the 20% tax credit. This mitigation would reduce the impact on heavily mortgaged landlords but would not eliminate the NI charge for those with unencumbered properties.
It is important to note: this is not yet law. The current Labour government has not committed to implementing the NEF proposal. But Labour's broader political positioning on investment income — including the CGT rate increases and changes to non-dom rules — means a proposal of this type carries more credibility than it would have under a Conservative government.
What it would mean for contractor landlords
Contractors who run a limited company and also hold buy-to-let properties face a potential double NI exposure that employed landlords do not. Consider a typical contractor picture:
- Salary from limited company: Class 1 employee and employer NI on the salary portion
- Rental profits: currently NI-free
Under the NEF proposal, rental profits would also attract Class 4 NI. Using Class 4 rates as a guide:
- On £20,000 of rental profit: approximately £450 (at 6% above a £12,570 threshold: £7,430 × 6%)
- On £40,000 of rental profit: approximately £1,642 (£37,700 × 6% up to the upper limit, residual at 2%)
These are estimates based on current Class 4 rates — the actual mechanism may differ if and when legislation is drafted.
For a contractor already managing NI carefully through their salary/dividend strategy, this represents a meaningful new cost on income they currently plan as NI-free. See our dividend vs salary guide for the full picture of how NI affects contractor remuneration planning.
Personal ownership vs limited company — does the structure matter?
Properties held inside a limited company are subject to corporation tax (25% in 2026/27) on rental profits — not income tax, and not NI. If the NEF proposal were legislated for individuals, property held in a limited company might avoid NI exposure, but at the cost of corporation tax on rental profits and income tax (or NI) when profits are extracted as salary or dividends.
The comparison is not straightforward. Factors to weigh include:
- Your personal marginal tax rate vs the 25% corporation tax rate
- The SDLT cost of transferring personally-held property into a company (potentially a 3% surcharge plus full SDLT rates)
- The CGT position on disposal — property held in a company does not benefit from private residence relief
- The impact on mortgage availability and rates (many lenders impose tighter criteria for company-owned buy-to-let)
Restructuring purely to avoid a proposal that may not become law carries its own costs and risks. The prudent approach is to review your structure, understand what it would mean for each scenario, and be ready to act quickly if legislation is announced. Our IR35 guide covers how HMRC approaches income classification questions that overlap with this area.
Frequently asked questions
Do landlords currently pay National Insurance on rental income?
No. Rental income is investment income and is entirely exempt from National Insurance contributions. Income tax applies at the landlord's marginal rate, but Class 2 and Class 4 NI do not. This has been the position since NI was introduced — the NEF proposal in June 2026 is one of the most prominent recent calls to change it.
What would the NEF's proposal mean for contractor landlords?
Contractors who already pay NI on salary from their limited company would face a second NI charge on rental profits. On £20,000 of rental profit, the additional annual cost would be approximately £450–£1,150 depending on the rate and threshold used. The NEF's proposed mitigation — reintroducing mortgage interest deductibility — would reduce the impact for mortgaged landlords but not eliminate it.
Should I hold my rental property through my limited company?
There is no universal answer. Company ownership currently shelters rental profits from personal income tax and (under existing law) NI, but introduces corporation tax, restricted mortgage availability, and complex extraction costs. The right structure depends on your total income, your exit plans, and your wider tax position. Review the question with your accountant before making any changes — and especially before any potential legislation is announced.
For a broader view of how property income fits into your tax planning as a contractor, speak to one of our accountants.
Get ahead of the changes.
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