TaxYearSheetsMaking Tax Digital checker
Do you need MTD for Income Tax, from when, and when are your quarterly updates due? For sole traders and landlords.
Renters' Rights dates
For landlords in England: earliest rent-increase date, pet-request reply deadline, safety certificate renewals and the landlord database.
Side hustle tax checker
Selling on Etsy, Vinted or eBay? Check the £1,000 trading allowance, Self Assessment dates and whether platforms will report you.
Late penalty calculator
Missed 31 January? Estimate Self Assessment late filing and payment penalties plus HMRC interest, and see when the next penalty starts.
£1,000 property allowance
Landlords: compare the £1,000 property allowance with your actual expenses and mortgage interest relief, and check if you need to tell HMRC.
Mileage calculator
Sole traders and employees: work out a business mileage claim at HMRC's rates – 55p a mile for cars and vans in 2026/27.
Key UK dates coming up
As at 9 October 2026. Check the linked source before acting.
| Date | What | Who |
|---|---|---|
| 7 November 2026 | MTD quarterly update 2 for 2026/27 (GOV.UK) | Sole traders and landlords already in MTD |
| 15 December 2026 | Landlord database opens, West Midlands first – planned (GOV.UK) | Private landlords in England |
| 31 January 2027 | Self Assessment online return and payment for 2025/26 (GOV.UK) | Everyone in Self Assessment |
| 7 February 2027 | MTD quarterly update 3 for 2026/27 | Sole traders and landlords already in MTD |
| 2 March 2027 | Last day to pay 2025/26 tax before the first 5% late payment penalty (GOV.UK, penalty calculator) | Anyone who owes 2025/26 tax |
| 6 April 2027 | MTD starts for qualifying income over £30,000 in 2025/26 (GOV.UK) | About 1 million more sole traders and landlords |
| 7 May 2027 | MTD quarterly update 4 for 2026/27 | Sole traders and landlords already in MTD |
| 5 October 2027 | Register for Self Assessment if you had new untaxed income in 2026/27 (GOV.UK) | New side hustlers, sole traders, landlords |
| 14 November 2027 | All private landlords in England registered on the database – planned | Private landlords in England |
Questions
Is this checker free?
Yes. The checkers and calendar downloads are free with no sign-up. We also sell optional record-keeping spreadsheets, linked after your results.
Do you store my answers?
No. Everything is worked out in your browser. Nothing you type is sent to us or saved, and the site sets no cookies.
Where do the rules come from?
From GOV.UK and legislation.gov.uk pages, linked next to every date and rate. Dates marked planned or estimate may change or depend on details the checker can't see.