AccountsAI
Start your accounts

Limited company accounts & corporation tax return, online Year-end accounts and corporation tax. Filed. £49 per year-end
accounts, tax return and filing

Send your bank statements. An AI accountant prepares your annual accounts and Company Tax Return, then files both for you. You check and sign.

Files directly with Companies House and HMRC. Nothing is sent until you sign off.
Example conversation · Northgate Studio Ltd · year ended 31 Mar 2026
I run a small limited company. My accounts are due and I don't know where to start.
A
I can do them for you. Send me your bank statements. A CSV export is fine.
CSVTide_statement_2025-26.csv
538 transactions
A
Reading transactions
Last year's accounts from Companies House
Balancing the books
A
Just one question: the £1,200 from Hartley Print on 28 March. Was that a deposit for work you did after your year end?
Yes, next year's job No, it was for this year
A
Done. Here's your year-end:
Annual accounts
micro-entity
Company Tax Return
CT600
Corporation tax computation
£5,674.08 to pay
A
Sign and file with Companies House and HMRC
Sign and file · £49

When are limited company accounts due?

Every limited company has to do this. Every year. Even if it made nothing.

Two filings, once a year, whether you traded a lot, a little, or not at all. Accounts go to Companies House. A Company Tax Return goes to HMRC. Together, that's your "year-end".

The year after the year: Northgate Studio Ltd, year end 31 March 2026 Fictional example
AprMayJunJulAugSepOctNovDecJanFebMar Year end · 31 Mar 2026 Accounts due 31 Dec 2026 · Companies House Tax to pay 1 Jan 2027 · HMRC CT600 due 31 Mar 2027 · HMRC
Accounts: 9 months after your year end. They go on the public record. Tax payment: 9 months and 1 day after. Tax return: 12 months after. Your dates depend on your own year end. Add your company and the app shows them.

Late filing penalties for company accounts and your CT600

The fines start the next day. They don't stop.

These are the penalties GOV.UK publishes, for a typical private company. The HMRC amounts are for returns with a filing date on or after 1 April 2026.

£0£500£1,000£1,500 Deadline1 mo3 mo6 mo12 mo Time since the deadline £150 £375 £750 £200 £400 Companies House: £1,500 HMRC: £400, plus 10% steps 6 months: HMRC estimates your tax and adds 10% of the unpaid tax 12 months: another 10% of the unpaid tax Filing on time with AccountsAI: £49
Companies House line: private company accounts. HMRC line: late Company Tax Return, not counting the 10% amounts, which depend on your unpaid tax.
One day late on both
£350. On time with us: £49.
£150 from Companies House plus £200 from HMRC.
Doubled if the accounts are late two years in a row. HMRC's return penalties go up to £1,000, or £2,000 once 3 months late, if the return is late 3 times in a row.

Filed your accounts but not your CT600?

Filing your accounts does not file your tax return.

Annual accounts go to Companies House. The Company Tax Return (CT600) goes to HMRC, separately, with the tax computation and a copy of the accounts. Many directors file their accounts, often themselves, and assume they are done.

HMRC's free online CT600 service closed on 31 March 2026, so there is no free HMRC route now. You need commercial software. We prepare and file just the CT600 for £39.

Two separate filings, example company
Annual accounts
Companies House
Filed
Company Tax Return (CT600)
HMRC, with the tax computation
Not filed
Northgate Studio Ltd · year ended 31 Mar 2026 · fictional example

How AccountsAI prepares your accounts like an accountant would

From bank statement to filed. The steps an accountant would take.

Behind a year-end is a long list of real work, done in a set order. You don't need the jargon. Follow one example company's data down the line, then look up any word you've been nodding along to.

What it does automatically

  • Pulls your company details, accounting period and deadlines from Companies House.
  • Reads last year's filed accounts from Companies House for your opening balances.
  • Reads the CSV export from any UK bank and maps the columns itself.
  • Categorises every transaction, and asks only about the ones your bank data can't explain.
  • Reads documents from your previous accountant (PDF, images or Excel), such as last year's accounts, tax computation or trial balance.
  • Fills in the filing form from Companies House data.
  • Checks everything against HMRC's validation rules before anything is sent.
01 · Read

Every row of your bank statement

Hundreds of lines, none typed by you.

date,description,amount
02/04/25,BRIGHTWELL MEDIA LTD,4800.00
04/04/25,FIGMA MONTHLY,-15.00
07/04/25,THE CO-WORKING HUB,-320.00
02 · Sort

Into the right headings

Sales, software, rent, wages. The nominal ledger.

Brightwell MediaSales
Figma monthlySoftware
Co-working HubRent
03 · Adjust

Money that belongs to another year

The year-end adjustments an accountant makes.

Accrual240.00
Prepaymentnone
Deferred income1,200.00
Director's loan439.50
Fixed asset1,450.00
04 · Balance

A trial balance that balances

Debits equal credits, or it's found before you see it.

Debits89,420.00
Credits89,420.00
Difference0.00
05 · Report

Profit and loss, balance sheet

Micro-entity accounts, FRS 105.

Turnover86,420.00
Other charges(31,106.40)
Profit before tax30,951.10
06 · Check

Tax worked out, tagged, checked

Official iXBRL, run through HMRC's validation rules.

Taxable profit29,863.60
Tax at 19%5,674.08
Validation checkspassed
Northgate Studio Ltd, year ended 31 Mar 2026. Example company, example figures, simplified.

The jargon buster.

Accountant-speak on the left of every tile. Plain English underneath.

Accruals

A bill for this year that you only pay next year. It still counts as a cost this year.

March electricity240.00
Counted this year
Deferred income

A customer paid you in March for a job in April. That money is next year's income, not this year's.

Hartley Print · 1,200.00 held back
Director's loan account

A running tally of what you owe the company, or it owes you. Paid for something personally? It owes you.

+14.00 · +46.50 · -500.00 = 439.50 owed
Trial balance

Every figure is recorded twice: where the money came from, and where it went. If the two sides don't match, something is wrong.

Debit89,420.00
Credit89,420.00
Balancesyes
Capital allowances

A laptop lasts years. The tax rules let the company claim an allowance against it. Example: 1,450.00.

Opening balances

This year starts exactly where last year ended. Read from your filed accounts at Companies House.

Nominal ledger

The master list of headings every payment gets filed under. Sales, software, rent, wages.

Marginal relief

19% on profits up to £50,000 and 25% above £250,000. In between, the rate slides.

iXBRL

The official digital format. Every figure in your accounts is tagged so HMRC and Companies House can read it, then checked against HMRC's validation rules before anything is sent.

Notes from your previous accountant

Upload their files and it reads them. Same approach, easy switch.

Tax computation.pdf Trial balance.xlsx Asset register.xlsx

File your company accounts without an accountant

A few questions. One tap each.

Your bank can tell us what moved. It can't tell us why. When that matters, we ask in plain English and you pick an answer.

Everything else comes from your bank and Companies House.

Question 3 of 312 Jun 2025
You paid £1,450.00 for a laptop. Is it equipment you'll keep using, or a one-off expense?
Equipment I'll keepOne-off expense
Question 2 of 39 Feb 2026
£500.00 came in from Sam Northgate. Is it a loan from you, or money from a customer?
A loan from meA customer
Question 1 of 328 Mar 2026
£1,200.00 from Hartley Print. Was it a deposit for work you did after your year end?
Yes, next year's jobNo, this year'sNot sure
Example questions, example company.

Filing company accounts online: three steps

Export

Download the CSV from your online banking and drop it in. No bank login to hand over.

Answer

A handful of questions your bank data can't answer. One tap each.

Sign

Look it over and sign off as director. One sign-off sends both filings.

Five steps. No emails to chase.

Step 1
Find your company
Search by name or number. We pull it from Companies House and show what's due.
Step 2
Upload statements
Drop in the CSV export from any UK bank.
Step 3
Answer a few questions
Only what your bank data can't tell us.
Step 4
Review your accounts
Look over the accounts and the tax computation before you sign.
Step 5
Sign and file
One sign-off sends both filings. You see the confirmations.

Company accounts you can check before you sign

Shows its working.

You're signing your company's accounts, so you should be able to check them. Review every figure before you sign, and ask the AI where any of them came from.

Profit and lossYear to 31 Mar 2026
Northgate Studio Ltd
Turnover86,420.00
Staff costs(24,000.00)
Depreciation(362.50)
Other charges(31,106.40)
of which Software(2,184.00)
Profit before tax30,951.10
Software (2,184.00) is made of
Figma · 12 payments180.00
Google Workspace · 12 payments132.00
Cloud hosting · 12 payments1,440.00
Domain and email tools432.00
Example figures for a fictional company.
Built to follow UK accounting standards (FRS 105) and HMRC's rules Checked against HMRC's validation rules before it's sent Nothing is filed until you sign
£125 per year-end

A real accountant reviews your company accounts, when you want one.

A qualified accountant joins the conversation. They can ask the AI why it did something, and they sign off before anything is filed.

Accountant joined · reviewing Northgate Studio Ltd
Why is the £1,200.00 from Hartley Print not in this year's income?
A
The director said it was a deposit for next year's job, and the work was after 31 March. So I've held it back as deferred income. It will count in next year's accounts.
Approved. Ready to file.
Example conversation, example company.

What's included: annual accounts, CT600 and tax computation

Then you get the receipts.

Both filings come back with an acceptance confirmation. Here's what they look like, for a fictional company. These are examples, not real filings.

Companies HouseAcceptedAnnual accounts · micro-entity
Northgate Studio Ltd · 12345678
1 Apr 2025 – 31 Mar 2026
14 Jun 2026 · 10:42
Ref EX-CH-7Q4M-2291
HMRCAcceptedCT600 + computation
Northgate Studio Ltd · 12345678
Tax due £5,674.08 · pay by 1 Jan 2027
14 Jun 2026 · 10:42
Ref EX-HMRC-0042-8816-5530

Who it's for

Small limited companies with simple books.

If your company files micro-entity accounts, you're in the right place.

Contractors & IT consultantsOne-person Ltd, invoices in, a few costs out.
Freelancers & creative agenciesClient income, software and subcontractors.
First-year companiesNo filed accounts yet? Start from zero.
Small shops, salons and cafésCard takings and supplier payments.
Companies switching from an accountantAdd last year's files and keep the same approach.

Not yet for full FRS 102 accounts, groups, R&D claims or property income.

Works with your bank's CSV export

  • Tide
  • Starling
  • Monzo
  • Barclays

These are examples. Any UK bank that lets you export a CSV works: the AI reads the file and maps the columns itself.

Pricing for company accounts and corporation tax returns

The whole year-end. One flat price.

Per year-end. No hourly rate, no extras for the tax return, no chasing for paperwork.

AccountsAI
£49
Accounts, tax return and filing.
Doing nothing
£350+
in penalties if you are one day late on both filings. They only go up.
You file
£49per year-end

Annual accounts and Company Tax Return, prepared and filed. You review everything and sign off as director.

Start your accounts
  • Micro-entity annual accounts
  • CT600 and tax computation
  • Opening figures from last year's filing
  • Checked against HMRC's validation rules
  • Filed with Companies House and HMRC
CT600 only
£39per year-end

For companies that have already filed their accounts at Companies House. We prepare and file the Company Tax Return with HMRC only.

File my CT600 only
  • CT600 and tax computation
  • Starts from the accounts you already filed
  • Differences shown for you to confirm
  • Filed with HMRC only

How CT600-only filing works

Accountant reviewsHuman in the loop
£125per year-end

The £49 package, reviewed. A qualified accountant looks over the AI's work and signs off before filing.

Start with an accountant's review
  • Everything in the £49 package
  • Qualified accountant's review
  • The accountant can question the AI's work
  • Accountant signs off before filing

Prices are per year-end and are the same for every company.

Frequently asked questions

Ask away.

Why use software at all? HMRC closed its free online CT600 filing service on 31 March 2026, so companies now need commercial software. From April 2028, Companies House requires all accounts to be filed through software.
How much does it cost to file limited company accounts?
It's £49 per year-end if you review and file yourself, or £125 with a qualified accountant's review. Either way you get the annual accounts, the CT600 and the tax computation, filed with Companies House and HMRC. If your accounts are already filed and you only need the Company Tax Return, it's £39.
I have already filed my accounts. Do I still need to file a CT600?
Yes. Filing annual accounts at Companies House does not file your Company Tax Return. The CT600 goes to HMRC separately, with the tax computation and a copy of the accounts. We can prepare and file just the CT600 for £39.
Can I file my own company accounts without an accountant?
Yes. Directors can file their own accounts. I ask in plain English, and only when I can't tell from your bank data. You review the result and sign as director. If you'd like a professional check, the £125 package adds a qualified accountant's review.
What are micro-entity accounts?
A simplified set of annual accounts for the smallest companies, prepared under FRS 105. A company can use them if it stays under the size limits for turnover, balance sheet total and number of employees. If you're not sure you qualify, check the size limits on GOV.UK before you start.
What is a CT600?
The CT600 is the Company Tax Return, the form your company sends HMRC each year. It reports your profits and the corporation tax due, with a tax computation showing how the figure was worked out. I prepare and file both.
When is my corporation tax due?
Corporation tax is usually due 9 months and 1 day after your accounting period ends. The Company Tax Return is due 12 months after it ends. For a 31 March 2026 year end, that is 1 January 2027 to pay and 31 March 2027 to file.
Is there a free HMRC service for the CT600?
No longer. HMRC's free online service for filing accounts and the Company Tax Return closed on 31 March 2026. From 1 April 2026 you need commercial software to file with HMRC.
What do I need to get started?
Your company name or number, and a CSV export of your business bank statements for the year. That's it. Documents from your previous accountant are optional extras.
Do I need to file if my company made no money?
In most cases yes. Filing is due even if the company traded very little or made a loss. A first-year company is covered too: with no filed accounts to read, I start from zero and work from your statements.
What if I miss the deadline?
Penalties start the day after. For private company accounts, Companies House charges £150 up to 1 month late, rising to £375, £750 and then £1,500 after 6 months, and doubles it if the accounts are late two years in a row. HMRC charges £200 the day after the deadline for a Company Tax Return and £400 in total once it is 3 months late, then 10% of the unpaid tax at 6 months and another 10% at 12 months. If you are already late, file as soon as you can.
Which banks work?
Any UK bank that lets you export statements as a CSV, including Tide, Starling, Monzo and Barclays. You upload the file, so there's no bank login to hand over.
What if the AI gets something wrong?
I ask when I'm not sure. Nothing is sent until you review and sign off. If you'd rather have a professional check, the £125 package adds a qualified accountant's review before filing.
I had an accountant last year. Can I switch?
Yes. I read last year's filed accounts from Companies House for your opening figures. If you have documents from your old accountant, such as the tax computation or trial balance, add them (PDF, images or Excel) and I'll read those too.
What can't it do yet?
It's built for companies filing micro-entity accounts. It isn't yet for companies that need full FRS 102 accounts, for groups, or for complex tax such as R&D claims or property income.

Avoid the penalties. File for £49.

Upload your statements when you are ready. Nothing is sent until you sign.

Start your accounts — £49 File my CT600 only — £39
Check your deadlines