As Chancellor Rachel Reeves considers extending National Insurance to rental income, landlords are asking the same urgent question: how much will new landlord NI charge cost per property? Fresh analysis suggests the figure averages £722 per year nationwide, a burden that could reshape the private rental market…

What the Figures Show

Research from Inventory Base estimates that applying an 8% NI charge on self-employed landlords’ rental income—after allowing for typical maintenance deductions—works out at £722 per property each year. This gives landlords a clear picture of how much the new landlord NI charge will cost per property, but the impact varies sharply by region.

In London, the charge would reach around £885 per property annually, the highest in the UK. The East of England follows at £802, and the South East sits close behind at £792. The South West would see costs of about £750 per property.

Regional Impact on Landlords

The variation in costs reflects the broader rental market divide. Higher rents in the South inevitably mean landlords there face steeper National Insurance bills, while those in regions such as Yorkshire & Humber and Wales carry a lighter burden.

For many landlords, the question of how much will new landlord NI charge cost per property isn’t just about numbers—it’s about sustainability. Margins are already tight, and the additional charge could affect whether they keep or sell their rental homes.

What This Means for the Rental Market

For Labour, the proposal offers a route to raise £2–£2.2 billion without breaking manifesto pledges on income tax, VAT or National Insurance for employed workers. Extending NI to landlords’ rental income is seen by the Treasury as a way to “level the playing field”.

Yet the debate goes beyond the headline figures of how much the new landlord NI charge cost per property. The National Residential Landlords Association (NRLA) warns the measure would ultimately “hit renters in the pocket” as landlords pass on costs. Knight Frank has echoed this, suggesting more landlords could exit the sector, further squeezing rental supply.

Landlord and Industry Reaction

Sián Hemming-Metcalfe, Operations Director at Inventory Base, expressed the frustration many landlords feel:

“Landlords are already trying to guesstimate and juggle any potential financial fallout of the Renters’ Rights Bill, so slapping an NI charge on rental income feels less like policy and more like punishment. The private rental sector thrives on stability – tenants need secure homes, landlords need predictable returns. Add another layer of tax and all you create is uncertainty, and uncertainty drives good landlords out of the market.”

Others in the sector have described the plan as a “final nail in the coffin” for small landlords, while some argue it sends the message that property investors are not “working people” despite providing homes across the country.

Final Thoughts:

Beyond the raw numbers, the proposal risks destabilising a sector already grappling with legislative reform. If implemented, it could accelerate landlord exits, reduce rental supply, and ultimately drive up rents for tenants.

What looks on paper like a revenue-raising measure may, in practice, deepen pressures across the housing market.

Let us Assist you

At Assist Inventories, we’re proud to be London’s trusted specialists in property inventories. Our award-winning reports are fast, accurate, and set the standard for clear, reliable property documentation. Whether you need a single inventory, a full schedule of condition, or ongoing property reporting, our team delivers with precision and consistency.

Explore our range of property inventory services here or get in touch today to see how we can help safeguard your rental investments. For complete peace of mind, we remain the only property inventory company to offer a full money-back guarantee.