Part 3

Industrial buildings allowances
Chapter 6

Writing-down allowances

Basic rule for calculating amount of allowance
310
1
The basic rule is that the writing-down allowance for a chargeable period is—
a
in the case of qualifying enterprise zone expenditure, 25% of the expenditure, and
b
in the case of other qualifying expenditure, 4% of the expenditure.
2
The allowance is proportionately increased or reduced if the chargeable period is more or less than a year.
3
This basic rule does not apply if section 311 applies.
Pt. 3 modified (24.2.2003) by Proceeds of Crime Act 2002 (c. 29), s. 458(1), Sch. 10 para. 18 (with Sch. 10 para. 21); S.I. 2003/120, art. 2, Sch. (with arts. 3 4) (as amended (20.2.2003) by S.I. 2003/333, art. 14)
S. 45H(2) modified (with effect in accordance with s. 167 of the amending Act) by Finance Act 2003 (c. 14) , Sch. 30 para. 7
Pt. 3 modified (5.10.2004) by Energy Act 2004 (c. 20) , s. 198(2) , Sch. 4 para. 5 ; S.I. 2004/2575 , art. 2(1) , Sch. 1
Pt. 3 modified (E.W.S.) (8.6.2005) by Railways Act 2005 (c. 14), s. 60(2), Sch. 10 para. 4; S.I. 2005/1444, art. 2(1), Sch. 1
Pt. 3 modified (8.6.2005) by Railways Act 2005 (c. 14), s. 60(2), Sch. 10 para. 15; S.I. 2005/1444, art. 2(1), Sch. 1
Pt. 3 modified (24.7.2005) by Railways Act 2005 (c. 14), s. 60(2), Sch. 10 para. 24; S.I. 2005/1909, art. 2, Sch.
Pt. 3 restricted (19.7.2007) by Finance Act 2007 (c. 11), s. 36(1)-(3), (7)
Pt. 3 omitted (with effect in relation to chargeable periods beginning on or after 1.4.2011 for corporation tax purposes and 6.4.2011 for income tax purposes in accordance with ss. 84(1)(3)(4), 85, 86 of the amending Act) by virtue of Finance Act 2008 (c. 9), s. 84(2) (with Sch. 27)