Record Keeping That Supports a Corporate Tax Return

Corporate Tax is computed by starting from accounting profit and applying the adjustments set out in the legislation. That makes the underlying accounting records the foundation of the return, not a separate exercise carried out at the deadline.

The adjustments themselves are where most of the documentation burden sits. Disallowed expenditure, exempt income, related-party transactions and any relief claimed each need a schedule that shows how the figure was arrived at and what supports it.

In practice, the businesses that find the filing straightforward are the ones maintaining these schedules alongside their periodic close, rather than reconstructing a full year of adjustments from ledger detail once the deadline is near.

It is also worth separating the categories in the chart of accounts from the start. Retrofitting a split between allowable and disallowable expenditure across a completed year is slower and more error-prone than recording it correctly as you go.