What the DIY route really involves
- Reconcile the year’s bookkeeping — every bank transaction categorised
- Prepare FRS 105 accounts: balance sheet with the prescribed statements and footnotes, P&L for members
- Build the tax computation: add back disallowables (entertaining, depreciation), claim capital allowances, apply any reliefs
- Complete the CT600 and file to HMRC in iXBRL; file the accounts to Companies House
- Diarise payment: Corporation Tax due 9 months + 1 day after year end
A director who enjoys this and has a simple company can absolutely do it. The honest time cost for a first attempt is usually a working day or two, plus staying current with rule changes every year.
When DIY is a reasonable choice
- Micro company, low transaction volume, software-kept books all year
- No employees, no VAT, no director’s loan movements
- You’re comfortable reading HMRC guidance and following it precisely
- You’d genuinely rather spend the time than the fee
When it isn't
- Money moved between you and the company informally — director’s loan rules have tax charges DIY filers rarely spot
- Dividends taken through the year without checking distributable profits
- Equipment bought — unclaimed capital allowances are simply overpaid tax
- Deadline already close — learning under time pressure with £150+ penalties waiting is a bad trade
- Your time bills at more than the fee — two days of a contractor’s time usually exceeds £399
The middle path: tidy books, fixed-fee year end
The setup that works for most owner-managers: you keep clean records in software through the year (cheap, mostly automatic), and hand the year end to us at a fixed £399 + VAT — accounts and CT600, prepared, approved by you, filed to both bodies. You keep control and visibility; the judgement calls land on us. Call 0114 327 1480.
Frequently asked questions
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