Built a free UK tax calculator that actually handles the stuff most generic tools miss for landlords and Airbnb hosts:
- £1,000 property allowance applied correctly (separate from the £1,000 trading allowance)
- £7,500 Rent a Room scheme if it's your main home (so a spare-room let earning under £7,500 a year is fully tax-free with no Self Assessment required)
- Income tax bands properly stacked with PAYE income
- The fact that property income does NOT attract Class 4 NI (often overlooked - landlords with a day job often think they owe NI on rental profit, they don't)
- The 20% mortgage interest credit (full deduction has been gone since the 2020 phase-out)
Particularly relevant given the Furnished Holiday Letting (FHL) regime was abolished from 6 April 2025 - holiday lets are now taxed largely the same as long-term residential lets. A lot of Airbnb hosts haven't fully adjusted to that change.
Link: https://sidetax.co.uk/pages/airbnb-host-tax-uk.html
Free, no signup, runs in your browser. Built it for self-managing hosts with 1-3 properties who find tools like Arthur or PriceLabs overkill, and find the HMRC pages incomprehensible.
Open to feedback. If I've got the post-FHL rules wrong anywhere or the property allowance logic doesn't match how you read it, please tell me.