| Income | Sources, categorisation, timing and completeness across employment, self-employment, dividends, property, savings and other income. | Bank statements, invoices, platform reports, dividend records, P60/P45 information where applicable. |
| Expenses | Business purpose, allowability, personal-use apportionment and correct period. | Receipts, invoices, mileage records, contracts, supplier statements. |
| Allowances | Which allowances are relevant to your status, structure and circumstances. | Records establishing status, ownership, use and qualifying conditions. |
| Reliefs | Availability under applicable rules, and whether the underlying facts genuinely fit. | Documentation demonstrating the qualifying activity, cost or condition. |
| Offsets | Legitimate offset opportunities against the right income or profit stream. | Clear business-purpose trail, apportionment workings, contemporaneous records. |
| Credits | Eligibility assessed before any claim language is used, including where a specialist is needed. | Evidence packs, eligibility criteria, supporting calculations. |
| Business structure | Sole trader, partnership, limited company or landlord position and the treatment that follows from it. | Incorporation details, agreements, ownership records, Companies House data. |
| Tax year | Correct year allocation for income, expenses, reliefs and payments on account. | Dated records, prior returns, HMRC statements and notices. |
| Accounting period | Period alignment for company accounts and corporation tax computations. | Companies House period dates, prior accounts, bookkeeping cut-offs. |
| Evidence | Whether the documentation genuinely supports the position being taken. | Complete, legible, contemporaneous records rather than reconstructions. |
| Deadlines | Filing and payment dates, and what must be ready by when. | Notices to file, accounting reference dates, VAT and payroll schedules. |
| HMRC guidance | Applicable published guidance and legislation for each treatment considered. | Referenced guidance recorded alongside the treatment decision. |
| Filing responsibilities | Who is responsible for what, including approvals before submission. | Agreed scope, authorisations, approval records. |
| Risk and review notes | Areas of uncertainty, weak evidence or judgement, flagged rather than buried. | Written risk notes and the reasoning behind each position. |