Everything your company must file, explained properly.
The filings a UK limited company owes are not complicated so much as scattered — two registers, separate deadlines, and a first year that breaks every rule. These are the plain-English answers, written by the people who built the filing engine.
Accounts & dormancy
Filing dormant accounts
Dormant doesn't mean nothing to file — it means two filings that are easy to forget and expensive to miss.
Read the guideCT603 notice while dormant
A tax demand for a company that owes nothing — the notice is real, the obligation is real, and both ways out are simple once you know them.
Read the guideCorporation Tax
Deadlines & penalties
Companies House
The confirmation statement
The filing with no numbers in it — and the one whose absence can dissolve your company.
Read the guideIdentity verification (directors)
The biggest change to Companies House in a generation is an ID check. It takes fifteen minutes — missing it blocks your filings.
Read the guideDoing it yourself
Do I need an accountant?
The honest version — because 'get an accountant' and 'just use software' are both sometimes wrong.
Read the guideFree HMRC service closed: options
The free government filing route is gone. Here's exactly what changed, what didn't, and the cheapest safe ways to file now.
Read the guideFile your own accounts + CT600
The thresholds moved, the free HMRC service closed, and most small companies can now legally file everything themselves — here's the whole job, honestly.
Read the guideFree tools
Reading is one thing. Run the numbers.
Our calculators run the exact engine WrenTax files with — so the answer on the page can't disagree with the answer on the return.
- Corporation tax calculatorMarginal relief, short periods, straddling years and associated companies.
- Late filing penalty calculatorWhat Companies House and HMRC will charge, calculated from your dates.
- Check your real deadlinesEvery statutory deadline for any UK company, straight from the register — free.