Dredging: Writing down period
Dredging allowances on an item of qualifying expenditure are given during a writing down period. No allowances are available for a chargeable period if that chargeable period falls outside the writing down period even if there is still expenditure unallowed.
The writing down period for qualifying expenditure is the 25-year period that begins with the chargeable period in which that qualifying expenditure was incurred.
Example Doug incurs qualifying expenditure in his chargeable period 24 May 2001 to 23 May 2002. The writing down period for that qualifying expenditure is the 25-year period 24 May 2001 to 23 May 2026.
If the qualifying expenditure was incurred before 6 November 1962 the writing down period is 50 years long.