http://www.legislation.gov.uk/ukpga/2001/2/section/335/2008-07-21Capital Allowances Act 2001An Act to restate, with minor changes, certain enactments relating to capital allowances.2001-04-05texttext/xmlenStatute Law Database2026-05-01Expert Participation2008-07-21 Capital Allowances Act 2001s. 774E(5)(b)Finance Act 2008Sch. 20 para. 12(11)Capital Allowances Act 2001s. 29(1A)The Fire and Rescue Services (Northern Ireland) Order 2006Sch. 3 para. 24(b)art. 1(3)art. 2Capital Allowances Act 2001s. 436(2)(aa)Planning (Consequential Provisions) (Wales) Act 2026Deddf Cynllunio (Darpariaethau Canlyniadol) (Cymru) 2026Sch. 2 para. 329(b)Sch. 5 Pt. 1s. 5(2) Part 3Chapter 83351If an allowance under Part 6 (research and development allowances) is made in respect of the qualifying expenditure, the amount of the allowance is written off at the end of the chargeable period for which the allowance is made.2If a balancing event occurs at the end of the chargeable period referred to in subsection (1), the amount written off under that subsection is to be taken into account in calculating the residue of qualifying expenditure immediately before that event to determine what balancing adjustment (if any) is to be made.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 Ch. 8 applied (5.10.2004) by Energy Act 2004 (c. 20) , s. 198(2) , Sch. 4 para. 6 ; 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. 1Pt. 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. 1Pt. 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)