here is a list of some important provisions and their effective dates.

INCOME TAX
Sl. No.	With effect from	Subject
1.	01.04.2011	Amendment to Section 44AA – Maintenance of Accounts
2.	01.04.2011	Amendment to Section 44AB – Audit of Accounts
3.	01.04.2011	Section 44AD Substituted – Presumptive Income
4.	01.04.2011	Amendment to Section 44AE – Income from goods Transport.
5.	01.10.2009	Amendment to Section 50C – Value of Capital asset transferred
6.	01.10.2009	Amendment to Section 56 – Transactions without consideration of more than Rs. 50,000/-
7.	01.04.2003	Amendment to Section 80A – Deductions
8.	01.10.2009	Amendment to Section 80G – Charitable Institutions
9.	01.04.2008	Amendment to Section 80IA – Power Generation
10.	01.04.2000	Section 80IB – Tax Holiday
11.	01.10.2009	Section 90 Substituted – DTAA –
12.	01.10.2009	Amendment to Section 92C – Transfer Pricing – Arm's Length Price
13.	01.04.1998	Amendment to Section 115JA – Deemed Income
14.	01.04.2001	Amendment to Section 115JB
15.	01.10.2009	Amendment to Section 131 – Discovery, Inspection etc – "Dispute Resolution Panel" included
16.	01.06.1994	Amendment to Section 132 – Search and Seizure – Additional Commissioner Empowered
17.	01.10.2009	Amendment to Section 139A – PAN – "Quarterly" removed
18.	01.04.1989	Amendment to Section 147 – Reassessment – Scope enhanced
19.	01.10.2009	Section 194C Substituted – TDS – Payment to Contractors
20.	01.10.2009	Amendment to Section 194I – TDS – Rent
21.	01.10.2009	Amendment to Section 200 – Quarterly Returns gone – Periodicity to be prescribed
22.	01.10.2009	Amendment to Section 201 – TDS failure
23.	01.10.2009	Amendment to Section 203A – Quarterly Statement is no more quarterly
24.	01.10.2009	Amendment to Section 206A & 206C – Quarterly to unspecified period
25.	01.10.2009	Amendment to Section 246A – Dispute Resolution Panel
26.	01.10.2009	Amendment to Section 253 – Appeal to ITAT – Dispute Resolution Panel
27.	01.06.2007	Amendment to Section 271 – Concealment of Income
28.	01.04.1988	Amendment to Section 271B – Provisional Attachment
29.	01.10.2009	Substitution of Section 282 – Service of Notice – Courier and Email recognized
30.	01.10.2010	New Section 282B – Allotment of Document Identification Number
31.	01.10.2009	New Section 293C – Power to Withdraw approval

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