Sinking fund (leasehold) meaning (UK): what it is and why it matters to landlords
A leasehold sinking fund (reserve fund) is money collected via service charges for future major works. Here’s what it means and a tiny example of the yield impact.
The short answer
A sinking fund (often called a reserve fund) is money collected through leasehold service charges and set aside to help pay for future major repairs (for example, roof replacement or large external works). Not every building has one, but many leases allow it.
For landlords, it matters because it affects cashflow and your net yield — and it can be a clue about how well the block is being planned and maintained.
A tiny example
Assume:
- Annual rent: £14,400
- Property value: £240,000
- Annual service charge: £1,800, including £300 paid into a sinking fund
Gross yield:
- (£14,400 ÷ £240,000 × 100 = 6.0%)
If you subtract only the service charge to get a simple “after service charge” figure:
- Net rent (simplified) = (£14,400 - £1,800 = £12,600)
- “After service charge” yield = (£12,600 ÷ £240,000 × 100 = 5.25%)
That £300 reserve contribution is part of the ongoing cost of owning the leasehold, so it belongs in your net-yield thinking.
What to check (quick)
- Does the building have a reserve/sinking fund and what’s the current balance?
- Are there known major works planned and how are they funded?
- Do service charges look stable, or do you see big spikes?
Helpful links
- Related calculator: /rental-yield/
- Related guide: /guides/service-charges-for-landlords-how-to-spot-risks/
- Related guide: /guides/rental-yield-explained-gross-vs-net/
- Glossary: /glossary/