The New Economics Foundation has renewed calls for rental income to be brought within the scope of National Insurance, reopening a tax idea that would hit landlords directly if it ever made its way into a Budget.
The think tank’s paper A modern system for fair rents argues that the tax system still favours residential property investment, and says one distortion sits in the National Insurance treatment of rental income.
For landlords, the immediate significance is political rather than legal. There is no government move to impose National Insurance on rents today. But the proposal is now back in circulation as part of a wider package of housing and rent reforms, which means it is the sort of measure that can shift quickly from think-tank paper to Treasury option list.
Why National Insurance on rents matters
National Insurance is generally charged on earnings, not on investment income. Extending it to rental profits would change the tax arithmetic for individual landlords and could sharpen the appeal of incorporation, restructuring or portfolio reduction depending on the final design.
Supporters of the idea say it would remove a tax preference and could be paired with the return of fuller mortgage interest relief so landlords are taxed more clearly on profits. Opponents will see it differently: another cost layered onto a sector already dealing with higher finance bills, tighter regulation and weaker room for error.
This follows Landlord Knowledge’s recent coverage of proposals that combined rent restraint with the return of tax relief, which showed how quickly landlord tax debates are becoming tied to wider arguments about affordability. The same trade-off is visible here – if policymakers want to tax rental income more heavily, landlords will ask what relief or offset comes back the other way.
Tax pressure is arriving from several directions
Landlords should also set the proposal against LK’s report on calls for a wider overhaul of stamp duty and council tax. The pattern is clear enough: property is again being treated as a tax base that policymakers and campaign groups think can carry more weight.
That does not mean every proposal will become law. But it does mean landlords should stop treating tax pressure as a settled post-Section 24 story. The next argument is not just about rates or thresholds. It is about which parts of rental income are treated more like earned income and which remain investment returns.
What this means for landlords
- If you hold personally: watch closely for any Budget consultation or fiscal paper that mentions National Insurance and property income in the same breath.
- If you are reviewing structure: tax treatment, not just mortgage pricing, may become a bigger reason to revisit how a portfolio is held.
- Watch for: proposals that package extra landlord tax with partial relief elsewhere.
- Bottom line: there is no new tax yet, but the policy argument has moved back into live circulation.
Editor’s view
Ideas like this rarely land in full the first time they surface. But once a tax proposal starts being framed as an unfair exemption, landlords should assume it may come back in a more serious form later.
Author: Editorial Team – UK landlord & buy-to-let news, policy, and finance
Published: 4 June 2026
Sources: New Economics Foundation
Related reading: Rent caps could cut rents £1,200 if tax relief returns
