The MTDfITSA saga has been running for many years,
and as of 23 November 2023, this is the current state:
Go live: start 5
April 2026 and apply to a way smaller base than the original intended group of
4.5 million users.   These are the key changes and points: 
- Who is
     in?  Self-employed people and
     property landlords (outside of Limited companies) need to register.  Initially, landlords with joint property
     ownership are not mandated to join (HMRC must provide more
     information).  Individuals MTDfITSA that previously did a Self
     Assessment can have ten or multiple self-employment businesses and 0 to 3
     (4 - Foreign property is unclear) property businesses under MTDfITSA (Ord
     UK property, FHL UK, FHL EEA, Foreign property).
- Who is
     out?  Partnerships are out, and non-dom
     status (has specific rules).  If a
     person is currently self-employed but has complications such as joint
     individual property ownership that generates rental income, being a
     partner in a partnership - will mean you are outside and continue to fill
     in self-assessments.  Trusts/estates, LLP and Ltd are out at the
     start.  Specific exemptions for income from foster care and
     individuals without a National Insurance Number do not need to register for MTDfITSA.
- EOPS
     concept is removed from MTD for ITSA.  
- Quarterly
     submissions are now cumulative booking numbers for the business.  The quarterly figures are cumulative per
     business for the year, i.e. Q2 submission consists of all data from Q1 and
     Q2.  Unlike VAT, ITSA quarters are
     cumulative during the year, whereas VAT is for a specific quarter.
- For
     each self-employed business or property business, a quarterly per-business
     submission is due to HMRC within 30 days of the quarter’s completion. 
     Declaration per business is still required (31 January the following
     year).  
- A
     single crystallisation submission for the user at the year-end is
     due 31 January each following year. 
     A yearly declaration is also required.
·      
Digital links/keeping (digital records). 
Can’t re-key/copy and paste.   There is no requirement to use bank
feeds/PDS2 data.  Some booking software firms will likely file
quarterly MTDfIT returns for each self-employed (and property)
business.  Spreadsheets are an acceptable form of record-keeping.   Excel
and bridging software are sufficient for the source for filing.  Recording
sales can use daily sales totals for the digital source but, ideally, link to
the raw input system.  
·       Quarterly
submissions requiring corrections are cumulative now, so you merely correct a
mistake by adjusting in the next period/quarter.
- Starting 6 April 2026, this shall
     apply to less than 750k users
- Self-assessment people with a combined income of £50k for the two
     years previous need to register for MTDfITSA; the plan is to drop to £30k
     the following year.
- There
     is a new penalty system.  Late
     payment has interest penalties, basically no penalty for 15
     days late, then 2% for 16-31 days and then 4% is paid after this.  4% is on the outstanding balance from the
     day past due.  Payment is due the following year on the 31 January.  There are points, fines, and interest
     charges.  Penalty points for late
     filing, missing four quarters in 24 months, is £200 penalty.  Record
     of last 24 months retained. 
Summary of comparison between ITSA & SA:
| SA | ITSA | 
| 1 SA return is done each year per person. | Four quarterly returns via approved software per business required a
  digital record link to the underlying transactions per self-employed
  business. Ask HMRC to explain how to correct business
  totals for the year as 1.  missing
  types of expenses, 2.  As EOPS was removed,
  assume you have 30 days to finalise business accounts from business
  year-end, bringing this forward nearly eight months. Crystallisation/Finalisation using HMRC-approved software per
  person, not per business. | 
| Paper submission due 31 October for the previous year. Online submissions are due 31 January – 9 months after the financial/tax
  year-end. | Approved Digital Software to submit (no paper returns). One month after each quarter, submit the quarterly cumulative return. No EOPS is due on 31 January the following
  year with new rules.   The Crystallisation/Finalisation/Final Declaration is also due 31 January
  the following year. | 
Quarterly MTDfITSA is done per business and is due one
month after the quarter period ends.  Property business
quarters and year-end run in the same cycles as personal tax, starting
on 6 April and ending the following year on 5 April.  As MTDfIT begins on
6 April 2026, the four quarterly submissions for the 2026-2027 tax year and
filling due dates are:
| Qrt start date | Qtr end date | Qtr submission due date | 
| 6 Apr 2026 | 5 July 2026 | 5 Aug 2026 | 
| 6 July 2026 | 5 Oct 2026 | 5 Nov 2026 | 
| 6 Oct 2026 | 5 Jan 2027 | 5 Feb 2027 | 
| 6 Jan 2027 | 5 Apr 2027 | 5 May 2027 | 
Self
Assessment filling options:
- Most
     people use the current XML online filing done on 31
     January after the personal tax year. 
     +-11 million people 2026/2027.
- Some
     people still use paper-based self-assessments due Oct
     after the tax year. 
- MTD
     for ITSA will be due one month after each business
     quarter, and the finalisation/crystallisation process is due 31 January,
     the year after the personal tax year. 
     As HMRC calc tax, declarations are required from the taxable individual
     for the year and after each quarter per business. +-500k people
 
 

