For UK limited companies
Your books, and the tax return that comes out of them.
Stewardry keeps the accounts and files the corporation tax return — CT600, computations and accounts — straight to HMRC. Whoever you bank with. Not only for the smallest companies.
HMRC recognition in progress. We will open filing once we are listed on GOV.UK, and we are taking early access requests now.
| Turnover | 250,000.00 |
|---|---|
| Trading costs | (150,000.00) |
| Depreciation | (12,000.00) |
| Profit per accounts | 88,000.00 |
| Add back: depreciation | 12,000.00 |
| Add back: client entertaining | 3,000.00 |
| Less: capital allowances | (30,000.00) |
| Trading profit | 70,000.00 |
| Bank interest | 2,000.00 |
| Profits chargeable | 72,000.00 |
| Corporation tax at 25% | 18,000.00 |
| Marginal relief | (2,670.00) |
| Tax payable | 15,330.00 |
Why now
HMRC closed its own filing service in March 2026.
For years a small company could file its accounts and corporation tax return through HMRC's free joint service. That closed on 31 March 2026. Every limited company in the country — dormant ones included — now needs commercial software or an accountant to do what it used to do for nothing.
Most companies in that position are keeping their books twice: once in bookkeeping software, and again in whatever prepares the return. The figures get copied across, adjusted by hand, and reconciled at the year end. That is where the cost sits, and where the errors get in.
Stewardry closes the gap. The return is computed from the same ledger the invoices went into, so the accounts you file are the accounts you kept.
How it works
Three steps, one set of figures.
- 01
Keep the books
Invoices, bills, bank transactions and the ledger behind them. The ordinary work of running a company, done in one place.
- 02
Review the computation
Stewardry proposes which costs tax disallows and what qualifies for capital allowances. It asks you to confirm anything it inferred, and refuses to file until you have.
- 03
File to HMRC
The CT600, the computations and the accounts go to HMRC as one submission, tagged in iXBRL. You keep the receipt.
What it does not do
It will not file a return you have not read.
Deciding whether a cost is deductible is judgement, not lookup. Where Stewardry has inferred something that changes the tax — whether a payment was entertaining, whether income belongs to the trade — it says so and asks a person to confirm it. Filing is refused until someone has.
A tax return is a declaration a director signs. Software should make it easier to get right, not easier to send without looking.
Questions
Reasonable things to ask.
- Who is this for?
- Directors of small UK limited companies who would rather not keep two systems, and the accountants who file on their behalf.
- Do I have to switch banks?
- No. Stewardry connects to your existing business account rather than requiring you to open a new one to get the software.
- Do I still need an accountant?
- Many companies should have one, and Stewardry is built to be reviewed by one. It does the arithmetic and the filing; it does not give advice.
- Is my data in the UK?
- Yes. Stewardry runs on infrastructure in the United Kingdom, and your ledger is not shared with anyone.
- What about companies too big for the micro-entity rules?
- They are on the roadmap. Tools that stop at micro-entity leave companies stranded the year they grow, which is the year the return gets harder.
Early access
We are looking for a handful of companies to file with first.
If you run a small limited company, or file for people who do, we would like to hear from you before we open more widely.