File your SA800 partnership tax return for £10 + VAT
HMRC has no online form for partnership returns, so filing online means buying software. Ours is £10 + VAT a return with no subscription: six steps from partnership details to the Partnership Statement, then you submit it straight to HMRC yourself.
Start your SA800£10 + VAT per return, paid when you submit. First tax year: 2025-26.
The trading income step, with HMRC's box numbers. Real screen, demo data.
SA800 filing with Tax Optimiser, at a glance
- What it does
- Tax Optimiser is software you use to prepare the SA800 Partnership Tax Return and the Partnership Statement, and to submit the return online to HMRC yourself.
- Who files
- You do. The nominated partner, or the partnership's accountant acting as agent, checks the return, makes the declaration and submits it under their own Government Gateway login. Tax Optimiser does not prepare or file returns on your behalf.
- Status
- Available now, in beta. SA800 filing is open to partnerships, LLPs and accountants.
- Price
- £10 + VAT (£12 including VAT) per partnership return, paid when you submit. There is no subscription. Accountants pay one credit per return, from £3 + VAT with credit packs.
- Who it is for
- Partnerships and LLPs filing their own return, and accountants and bookkeepers filing for clients.
- Why software
- HMRC says its own online service cannot be used to file for a partnership. A partnership return is filed online with commercial software, or on paper.
- First tax year
- 2025-26, the year from 6 April 2025 to 5 April 2026. HMRC's deadlines for that return are 31 October 2026 on paper and 31 January 2027 online.
- Pages covered
- The SA800 with the Partnership Statement (short and full) and supplementary pages SA801, SA802, SA803 and SA804.
Built for partnerships and the accountants who look after them
One return for the business, and the figures each partner needs for their own.
Partnerships and LLPs
Two partners or twenty, the price is the same: £10 + VAT for the year's return. Enter the business's figures once and each partner's share is worked out for the Partnership Statement.
See how it works →
Accountants and bookkeepers
File as an agent for every partnership client and pay with the credits you already use for accounts and CT600. One credit per return, down to £3 with credit packs. No per-seat fees.
See credit packs →From partnership details to filed return in four steps
Set up the partnership
Name, UTR and the page 2 questions, which decide the supplementary pages the return needs.
Enter income and the balance sheet
Income, expenses, capital allowances and the balance sheet, each box carrying its SA800 number. Totals calculate themselves.
Share the profit
Add the partners and their shares. The totals row shows at once whether they add up to the partnership's profit.
Review and submit
Problems are listed with a link to the step that fixes each one. Pay £10 + VAT, submit, and keep HMRC's response on file.
Three partners, 50/30/20, with the totals checked against box 3.83.
Every partner's share, checked before you file
The Partnership Statement is where partnership returns usually go wrong. Here the shares sit in one table with a totals row beneath, compared with the return's profit, loss and CIS boxes. If they do not agree, the return will not submit.
Each partner then puts their share on the partnership page of their own SA100 return.
Totals that add themselves up
Assets, liabilities and the partners' capital and current accounts, each with its box number. Total boxes are calculated from the boxes above them, so the balance sheet HMRC receives always casts.
The balance sheet step. Box 3.105 is calculated for you.
Review and submit: the declaration and a summary of the return.
Checked against HMRC's rules before it leaves
Before a return is sent it is run through HMRC's own validation rules for partnership returns, the same checks HMRC applies when it arrives. Anything that would be rejected is caught on your screen instead. You can also print the official SA800 form, filled in, for the partners to sign off.
Exactly what the SA800 covers
Check your return is in scope before you start.Everything listed here can be completed in the app and submitted to HMRC by you.
The main return
Trading and professional income and expenses
Disallowable expenses, itemised
Tax adjustments and net business profit
Balance sheet and partners' capital and current accounts
CIS deductions
Provisional figures and additional information
Partnership Statement
Short and full Partnership Statement
Any number of partners
Profit, loss, tax deducted and CIS shared by partner
Partners joining or leaving during the year
Shares checked against the partnership's profit before you can submit
Capital allowances
Annual Investment Allowance
Main pool and special rate pool
First-year allowances for zero-emission cars and goods vehicles
Structures and buildings allowance
Balancing charges
Supplementary pages
SA801 — UK property
SA802 — foreign income
SA803 — disposal of chargeable assets
SA804 — savings, investments and other income
Filing
Checked against HMRC's own validation rules before it is sent
The official SA800 form as a PDF, filled in
PDF attachments sent with the return
Submission history with HMRC's response
Amended returns
Not supported yet
- More than one trade in the same return
- Foreign property income and offshore funds on the SA802
- Tax years before 2025-26
Not sure about your return? Ask us →
What our customers say
I recently used Tax Optimiser for the first time to submit my accounts to Companies House and HMRC, and I’m thoroughly impressed. The platform is remarkably easy to manage, walking you through the entire process without any complex jargon. On top of that, their prices are extremely competitive. It saved me a ton of time and stress—I will definitely be using them again next year.
I had next to no confidence that Tax Optimiser could handle accounts submission and Corporation Tax. But I gave it a whirl… Both Companies House and HMRC have initially accepted the submissions… I previously filed on professional software and I paid about £1500. This is dirt cheap.
Excellent software. Very affordable if you're doing your own small company accounts. Links with Xero… Tax Optimiser has been a complete life saver for me.
Simple, honest pricing
The same price as our CT600 filing: £10 + VAT a return, or one credit if you are an accountant.
Pay-as-you-go
per partnership, per tax year, however many partners. Free to prepare, paid when you submit. No subscription.
SA800 and the Partnership Statement
SA801 to SA804 supplementary pages
Official SA800 form as a PDF
PDF attachments
Direct submission to HMRC
Email support
For accountants and bookkeepers
One credit = one SA800 return, or one company's accounts and CT600. All prices + VAT.
| Pack | Credits | Price | £ per credit |
|---|---|---|---|
| Pay-as-you-go | 1 | £10 | £10 |
| Starter | 25 | £200 | £8 |
| Practice | 100 | £600 | £6 |
| Growth | 250 | £1,250 | £5 |
| Scale | 500 | £2,000 | £4 |
| Enterprise Best value | 1,000 | £3,000 | £3 |
All prices exclude VAT. Credits do not expire.
Sign up to buy credits
Want to see how it works first?
The beta guide walks through a complete partnership return for a three-partner LLP, step by step, with screenshots.
SA800 questions, answered
Partners file their own share on a personal return. See SA100 Self Assessment.
Further reading
More from Tax Optimiser
Your SA800, filed for £10 + VAT.
Now available, in beta. Free to prepare, paid when you submit.
Start your SA800