Self-assessment returns, MTD quarterly reporting, and practical tax advice for individuals and sole traders across the UK.
Personal Tax Specialists
MTD Ready
Secure Client Portal
256-bit Encrypted
What we do
A complete service, built around your situation.
Self-assessment returns
HMRC self-assessment filed accurately and on time. Employment, self-employment, rental income, dividends and more.
From £299
Management accounts
Monthly P&L, balance sheets and cashflow forecasting to keep your business finances sharp and decision-ready.
From £149/mo
MTD for ITSA
Fully MTD-ready — quarterly digital submissions, compliant record keeping and final declarations handled end-to-end.
Included in plan
Tax advisory
Proactive, year-round planning to reduce your liability legally. Pension timing, salary/dividend mix, reliefs and restructuring.
From £199/session
How it works
Four simple steps. We handle the complexity for you.
Step 01
Get in touch
Email us about your situation. We'll confirm what you need, agree the fee, and set up your secure portal — usually within 24 hours.
You — 5 minutes
Step 02
Upload your documents
Log into your portal and upload your P60, bank statements, invoices and receipts. We track what's received and remind you about anything missing.
You — via your portal
Step 03
We handle everything
We review your records, compute your liability, cross-reference prior years, and identify any reliefs or allowances that could reduce your bill.
Us — the hard part
Step 04
Review and file
You review a clear summary in your portal, ask any questions via secure message, and approve. We submit directly to HMRC and send confirmation.
You approve — we file
Tax calculator
Estimate your 2026/27 tax bill.
Includes self-employment, rental, dividends, pension relief and student loan. Based on current HMRC rates — figures are an estimate only.
Income
£
£
£
£
£
Reliefs & deductions
£
Student loan
National Insurance
Tax estimate
Tax year 2026 / 27 — England & Wales
Total liability
£0
Income tax + NI + student loan
Total income£0
Personal allowance−£12,570
Pension relief applied−£0
Basic rate tax (20%)£0
Higher rate tax (40%)£0
Additional rate (45%)£0
Dividend tax£0
National insurance£0
Student loan repayment£0
Total due£0
Effective rate0%
Estimates only. Does not account for all reliefs, prior-year adjustments, or HMRC enquiries. Professional review recommended.
MTD for ITSA — live from April 2026
Your secure portal
Everything in one place. Always MTD compliant.
Your portal handles secure document exchange, quarterly MTD submissions and real-time return status. Click through the demo on the right to explore what your clients see.
→Four quarterly MTD submissions, reviewed by you before anything reaches HMRC
→Secure document vault — upload once, retained for HMRC reference windows
→Deadline reminders, payment-on-account alerts and HMRC confirmation receipts
→Direct secure message to your accountant — no email chains or lost attachments
Aitken Advisory — Client Portal
Sarah M.
SM
Overview
Dashboard
My returns
Documents
Upload
Vault
MTD
Quarters
Account
Messages
Invoices
Good morning, Sarah
2026–27 · MTD active · 3 items need attention
Tax estimate
£6,480
Return status
In review
Docs
8 / 10
MTD quarterly submissions 2026/27 Making Tax Digital for ITSA
Q1
Apr–Jun
Submitted
Q2
Jul–Sep
Submitted
Q3
Oct–Dec
Acct. review
Q4
Jan–Mar
Not started
Action items
Upload P60 — tax year 26/27Due 15 Jul
Confirm rental income — Q3Due 22 Jul
Q3 submission — accountant reviewIn progress
Q2 submitted to HMRC4 Jun ✓
My tax returns
All self-assessment returns on record
2026 / 27
Employment + rental · In progress
In review
2025 / 26
Employment + rental · Submitted 22 Jan 2026
Filed ✓
Tax paid: £5,940
2024 / 25
Employment only · Submitted 14 Jan 2025
Filed ✓
Tax paid: £4,210
2023 / 24
Employment only · Submitted 9 Jan 2024
Filed ✓
Tax paid: £3,880
Upload documents
2026–27 tax year · Securely encrypted
Drop files here or click to browse
PDF, JPG, PNG or XLSX · Max 20MB per file
Document checklist — 2026/27
P60 (employment income)Needed
P11D (benefits in kind)Received ✓
Self-employment accounts / invoicesN/A
Rental income & expense summaryNeeded
Bank statements (all accounts)Received ✓
Pension contribution certificateReceived ✓
Share / dividend statementsN/A
Document vault
All years · Securely stored
2026 / 27
6 files
2025 / 26
11 files
2024 / 25
9 files
2023 / 24
8 files
HMRC correspondence
4 files
Signed returns
3 files
MTD quarterly submissions
Making Tax Digital for ITSA — 2026/27
Q1 — Apr to Jun 2026
Submitted
Turnover / income£14,200
Expenses£1,840
Net profit£12,360
Submitted to HMRC 31 Jul 2026
Q2 — Jul to Sep 2026
Submitted
Turnover / income£13,750
Expenses£2,100
Net profit£11,650
Submitted to HMRC 31 Oct 2026
Q3 — Oct to Dec 2026
Acct. review
Turnover / income£15,400
Expenses£2,280
Net profit£13,120
Awaiting accountant approval
Q4 — Jan to Mar 2027
Not started
Turnover / income—
Expenses—
Net profit—
Due to HMRC 31 Jan 2027
MTD for ITSA requires quarterly digital submissions to HMRC. Your accountant reviews each quarter before it's submitted. The final declaration (year-end summary) is due by 31 January 2028.
Messages
Secure messages with Aitken Advisory
Today
Aitken Advisory
Q3 MTD figures — one query
Hi Sarah, I'm reviewing your Q3 figures. Could you confirm the rental income for November — the bank statement shows two...
4 Jun
Aitken Advisory
Q2 submission confirmed
Your Q2 MTD submission has been accepted by HMRC. Confirmation reference: MTD-2026-Q2-SM4821...
12 May
Aitken Advisory
Pension — worth topping up before year-end?
Based on your current income trajectory, a pension contribution before 5 April could save you approximately...
2 Apr
Sarah Mitchell
RE: 2025/26 return — sign off
Yes, happy to approve — everything looks correct. Please go ahead and submit to HMRC.
Invoices
Billing history with Aitken Advisory
INV-2026-009
MTD quarterly review — Q2 2026/27
Paid
£149
4 Jun 2026
INV-2026-007
MTD quarterly review — Q1 2026/27
Paid
£149
31 Jul 2026
INV-2026-004
Self-assessment 2025/26 — full service
Due 31 Jul
£380
Issued 1 Jun 2026
INV-2025-012
Self-assessment 2024/25 — full service
Paid
£350
22 Jan 2026
Your service plan
Upgrade any time — the difference is pro-rated.
Essential
£350 / year
Self-assessment return prepared & filed
Document vault & secure messaging
Deadline reminders
YOUR PLAN
Standard
£550 / year
Everything in Essential
MTD quarterly reviews & submissions
Live year-round tax estimate
SA302 / mortgage references
Premium
£850 / year
Everything in Standard
Proactive tax planning alerts
Annual planning call with your accountant
Priority response within 4 hours
Common questions
Everything you need to know, before you get in touch.
Self-assessment returns start from £299, depending on the complexity of your affairs. MTD quarterly reporting is included in your annual plan. You'll always get a clear, fixed quote before any work begins — no surprise bills, no hourly charging.
It depends on your income, but typically your P60 or P45, any self-employment or rental records, bank statements, dividend vouchers and pension contribution statements. Once you're set up, your secure portal lists exactly what we need and lets you upload everything in a few taps — we'll chase anything outstanding.
From April 2026, MTD for Income Tax applies to self-employed people and landlords with qualifying income over £50,000 — meaning quarterly digital updates to HMRC instead of one annual return. If that's you, we handle the whole thing end to end. If you're unsure whether it applies, just ask.
The online self-assessment deadline is 31 January following the end of the tax year, with payment due the same day. MTD quarterly updates fall in August, November, February and May. Your portal shows a live countdown to every deadline that applies to you, so nothing slips.
Yes. Your documents and information are held in an encrypted database with bank-grade 256-bit encryption, accessed only through your private portal. Your data is never sold or shared with third parties, and is handled in full accordance with UK GDPR.
Email us a little about your situation. We'll confirm what you need and the fee, then set up your secure portal — usually within 24 hours. From there you register, upload your documents, and we take care of the rest.
Get started
Ready to take the stress out of your tax affairs?
Drop us an email — no obligation, no jargon. We'll get back to you within 24 hours.
The self-assessment return has been filed successfully. The client will receive confirmation at their registered email and HMRC Government Gateway account.
HMRC Ref: SA-2026-7741-RP
AITKENAdvisory
PRACTICE VIEW
JA
J. Aitken
Practice
Dashboard
Clients
Pipeline
Review queue
3
Submissions
MTD approvals
2
Deadlines
Comms
Messages
1
Practice overview
2025/26 tax year · Updated today
Active clients
12
4 new this year
Returns pending
3
1 overdue
MTD quarters due
2
Before 5 Jul 2026
Invoiced this month
£4,820
2 outstanding
Urgent — action required
Robert Patel
SA return overdue — awaiting P&L and bank statements
Overdue
Sarah Mitchell
Q3 MTD update pending review — due before quarterly submission
Due 5 Jul
James Thornton
Q3 MTD update pending approval — P60 still awaited
Due 5 Jul
Emma Clarke
Draft SA return ready — awaiting client sign-off
Client review
Recent activity
Emma Clarke
Q2 MTD approved and submitted to HMRC
9 Jun 2026
Sarah Mitchell
Payslips and bank statements received via client portal
7 Jun 2026
James Thornton
Message sent — P60 reminder
5 Jun 2026
Clients
12 active clients · 2025/26 tax year
Client
Income type
Return status
MTD status
Last filed
Annual fee
Sarah Mitchell
Ref UT/2024/SM
Employment + Rental
In review
Q3 pending
31 Jan 2026
£550
James Thornton
Ref UT/2024/JT
Employment only
Awaiting docs
Q3 pending
31 Jan 2026
£350
Emma Clarke
Ref UT/2024/EC
Employment + Dividends
Signed off
Q2 submitted
31 Jan 2026
£475
Robert Patel
Ref UT/2024/RP
Self-employed
Overdue
Not started
31 Jan 2025
£650
Robert Patel
Self-employed · Ref UT/2024/RP · 2025/26
OverdueMTD registered
INCOME
Self-employment turnover£68,400
Less: allowable expenses−£14,230
Net profit£54,170
DEDUCTIONS
Personal allowance£12,570
Pension contributions£2,400
Taxable income£39,200
Estimated tax liability
£7,893
2025/26 tax year
Income tax (basic 20%)£5,466
Income tax (higher 40%)£600
Class 4 NI (6%)£1,747
Class 2 NI£80
Payments on account−£3,200
Balancing payment due£4,693
Prior year comparison
Taxable income2024/25: £49,800 → 2025/26: £39,200
Tax liability2024/25: £9,204 → 2025/26: £7,893
Effective rate2024/25: 18.5% → 2025/26: 20.1%
Document checklist — 2025/26
3 of 5 received
Invoices / self-employment income recordsReceived 4 Jun
Business expense receipts & recordsReceived 4 Jun
Personal bank statement (annual)Received 7 Jun
Business bank statement (annual)Outstanding
Pension contribution statementOutstanding
⚠Taxable income has dropped from £49,800 to £39,200 year-on-year — expenses increased significantly. Confirm with client that Q1–Q2 figures are complete and no income sources are missing.
ℹClient is registered for MTD for ITSA from April 2026. Q1 and Q2 submissions have been made. Q3 requires approval before 5 July 2026.
✓Pension contributions verified — £2,400 confirmed against statement on file. Relief at source applied correctly.
Add review note
Year-on-year comparison2024/25 vs 2025/26
Self-employment turnover£81,100£68,400▼ 15.7%
Allowable expenses£9,840£14,230▲ 44.6%
Net profit£71,260£54,170▼ 24.0%
Tax liability£9,204£7,893▼ 14.2%
Effective tax rate18.5%20.1%▲ 1.6pp
Review each quarterly update and approve to authorise submission to HMRC. You are the final approval gate before figures are filed.
Q1 — 6 Apr to 5 Jul 2025
Submitted to HMRC
Income
£18,200
Expenses
£3,410
Net profit
£14,790
Q2 — 6 Jul to 5 Oct 2025
Submitted to HMRC
Income
£15,600
Expenses
£4,150
Net profit
£11,450
Q3 — 6 Oct 2025 to 5 Jan 2026
Pending approval
Income
£20,400
Expenses
£4,890
Net profit
£15,510
✓ Approved — ready to submit to HMRC
Q4 — 6 Jan to 5 Apr 2026
Not yet due
Income
—
Expenses
—
Net profit
—
ℹComplete all checks below before filing the self-assessment return with HMRC. This creates an audit trail. All boxes must be ticked to enable the Submit button.
All income sources verified against HMRC pre-populated data and client records
Allowable expenses reviewed — private use restriction applied where applicable
Year-on-year movements reviewed — material variances have a documented explanation
Client has reviewed the draft return and confirmed accuracy in writing (or via client portal)
All supporting documents retained on file and referenced in working papers
HMRC agent authorisation (64-8 / digital) confirmed as current and in place
By submitting you confirm that to the best of your knowledge the information provided is correct and complete. Filing creates a permanent record in the client audit trail.
Review queue
Items requiring your attention before filing or submission
Overdue
Robert Patel
SA return — business bank statement & pension statement outstanding
Overdue
Due this week
Sarah Mitchell
Q3 MTD quarterly update — review figures and approve for HMRC submission
5 Jul 2026
James Thornton
Q3 MTD quarterly update — P60 awaited, approve once received
5 Jul 2026
Client sign-off pending
Emma Clarke
SA draft ready and sent to client for review — awaiting approval to file
Client review
MTD — quarterly approvals
Practice-wide view of all MTD for ITSA quarterly submissions
Q3 — 6 Oct 2025 to 5 Jan 2026 · Due 5 Jul 2026
Sarah Mitchell
Income £20,400 · Expenses £4,890 · Net £15,510 — awaiting approval
Review & approve →
James Thornton
Awaiting P60 — figures incomplete, do not approve yet
Docs pending
Emma Clarke
Q3 approved and submitted to HMRC on 3 Jun 2026
Submitted
Upcoming deadlines
All clients · HMRC filing dates and internal milestones
SA online return deadline — all clients. Tax due. Second payment on account.
SA deadline
Client messages
All inbound and outbound communications
RP
Robert PatelToday, 09:14
Hi, I'm still waiting on the pension statement from Aviva — they said it'll arrive by end of this week. The business bank statement is attached to this message. Sorry for the delay.
📎 business_bank_statement_2526.pdf
JA
You → Robert Patel5 Jun, 14:30
Hi Robert, just a reminder that we're still waiting on the business bank statement and pension contribution statement for the year. Could you send these across by 13 June to avoid any delays with your return?