ArcTax connects directly to HMRC so sole traders, landlords, and agents can file quarterly updates, track deadlines, and complete Final Declarations — without the complexity.
No credit card required · Cancel any time
Obligations · 2025–26
6 Apr – 5 Jul 2025
Due 5 Aug 2025
6 Jul – 5 Oct 2025
Due 5 Nov 2025
6 Oct – 5 Jan 2026
Due 5 Feb 2026
6 Jan – 5 Apr 2026
Due 5 May 2026
Q3 submission due in 18 days
4×
Quarterly submissions per year
£50k+
Income threshold from April 2026
100%
Direct HMRC API — no middleware
£10/mo
Starts from, cancel any time
The HMRC mandate
HMRC is rolling out MTD ITSA in phases. If you earn from self-employment or property, quarterly digital submissions will soon be mandatory.
April 2026
£50,000+
Sole traders and landlords above this threshold must comply
April 2027
£30,000+
The mandate extends to those earning above £30,000
April 2028
£20,000+
Full rollout — nearly all self-employed and landlords included
How it works
Sign up in minutes, choose Solo or Agent, verify your email, and you're in.
Authorise ArcTax via HMRC Government Gateway. We never see your password.
Enter income and expenses quarterly — or upload a CSV. We handle the HMRC API and store every submission.
Features
Not a generic accounting platform with MTD bolted on. ArcTax is purpose-built for quarterly MTD submissions — fast, focused, and compliant.
Connects straight to HMRC's MTD APIs via OAuth 2.0 — fully compliant, no third-party intermediaries.
Keep your Excel or Google Sheets. Upload a CSV and we convert it into an HMRC-compliant update automatically.
See every open deadline pulled live from HMRC. Never miss a quarterly update or Final Declaration.
Manage multiple clients, view their obligations, and submit on their behalf from one dashboard.
Every submission stored with HMRC reference numbers, payloads, and status — for every period filed.
Trigger a live tax calculation from HMRC at any time to see your estimated liability before you file.
Already tracking income in Excel or Google Sheets? Export to CSV, upload to ArcTax, and it's submitted to HMRC in one click. No need to change how you work.
Try bridging importyour_records.csv
Submitted to HMRC
Confirmation ref: XM9342-Q3-2025
Pricing
No hidden fees. No long-term contracts. Cancel any time.
Solo
For sole traders and landlords filing their own MTD returns.
Agent
For accountants and agents managing multiple clients.
Sign up and connect to HMRC · Billing starts only when you submit
FAQ
MTD ITSA requires self-employed individuals and landlords with income over £50,000 to keep digital records and send quarterly updates to HMRC from April 2026, replacing the annual Self Assessment return.
No. Our bridging import lets you export a CSV from any spreadsheet — Excel, Google Sheets — and converts it into an HMRC-compliant quarterly submission automatically.
Yes. Your accountant can sign up for an Agent account, add you as a client, and submit quarterly updates and Final Declarations on your behalf.
Self-employment, UK property (FHL and non-FHL), foreign property income, year-end adjustments, BSAS, and Final Declaration — the full MTD ITSA scope.
Yes. ArcTax connects directly to HMRC's MTD APIs using the official OAuth 2.0 authorisation flow. We never see your Government Gateway password.
Yes — sign up, connect to HMRC, and explore the dashboard at no cost. Billing only starts when you're ready to submit.
Anyone who is self-employed or receives rental income and whose total qualifying gross income exceeds the relevant threshold must use MTD-compatible software. From April 2026 that threshold is £50,000, dropping to £30,000 in 2027 and £20,000 in 2028. PAYE-only employees are not affected.
MTD ITSA becomes mandatory for sole traders with gross self-employment income over £50,000 from 6 April 2026. If your income is between £30,000 and £50,000 the start date is 6 April 2027, and for income over £20,000 it is 6 April 2028. The threshold is assessed against your previous tax year's income.
Yes, if your total qualifying income — rental income plus any self-employment income — exceeds the threshold. UK property landlords, foreign property landlords, and mixed-income taxpayers all fall within the MTD ITSA scope. The rollout follows the same phased schedule as sole traders: £50k from April 2026, £30k from April 2027, £20k from April 2028.
HMRC requires you to keep digital records of all business income and expenses throughout the tax year. This can be in dedicated accounting software, a spreadsheet, or any digital format — paper records are no longer compliant. If you use a spreadsheet, you must connect it to HMRC via bridging software to submit your quarterly updates.
HMRC uses a points-based penalty system for MTD. Each missed quarterly update earns a penalty point, and once you reach the threshold a £200 fixed penalty applies. Late payment of tax also incurs interest. Persistent non-compliance can trigger a formal HMRC compliance check. The safest approach is to get your software in place well before your mandatory start date.
MTD resources
Free guides covering everything sole traders, landlords, and agents need to know about MTD for Income Tax.
What MTD is, who it affects, and how quarterly reporting replaces Self Assessment.
Read guideQuarterly deadlines, income categories, and how to use bridging software if you keep spreadsheets.
Read guideHow UK and foreign property rental income must be reported under MTD ITSA.
Read guideWhat to look for in MTD-compatible software — direct API, bridging support, and HMRC approval.
Read guideHow HMRC's MTD API and Government Gateway authorisation work in practice.
Read guideMTD ITSA rollout dates for 2026, 2027, and 2028 — and what to do before your start date.
Read guideJoin sole traders, landlords, and agents using ArcTax to file directly with HMRC — simply and compliantly.