14th January:
Submission of tax deduction against interest, dividend or any other amount paid to non-resident during 1st, October - 31st, December. Form No: 27

15th March:
In case of other than company - Payment of 3rd installment of advance for the financial year In case of a company - Payment of 4th installment of advance for the financial year

14th April:
Submission of statement of tax deduction against interest, dividend or amount paid to non-resident during 1st, January - 31st, March. Form No: 27

30th April:
(i) Certificates of such taxes which are deducted due to payment given to employees as their salary. From No: 16
(ii) Certificates of such taxes, which are deducted due to amount, paid as insurance commissions. Form No: 16A
(iii) Certificate of tax deducted other than salary Form No: 16A
(iv) filing annual return of dividend and income in terms of units under section 206 of Income Tax Act 1961. Form No: 26

31st May:
(i) filing of annual return against earning from prize, lottery. Form No: 26B
(ii) filing of annual return against earning from horse races. Form No: 26BB
(iii) filing of annual return against salary paid. Form No: 24

15th June:
In case of company - Payment of 1st installment of advance for the financial year

30th June:
(i) filing of income tax return if assessee is not a corporate/ cooperative and having no source of income from business/ profession. Form No: 3/2A
(ii) filing of income tax return against insurance commissions/ commission paid without deduction of tax. Form No: 26D, 26E
(iii) filing of income tax return against interest either on securities or on any other. Form No: 25, 26A
(iv) filing of income tax return against payment to contractors Form No: 26C
(v) filing of income tax return against deposits under national saving schemes Form No: 26F
(vi) filing of income tax return against payment for purchasing of Mutual Funds Form No: 26G
(vii) filing of income tax return against payment of commission on sale of lottery Form No: 26H
(viii) filing of income tax return against payment of rent Form No: 26J

14th July:
Submitting date for the statement of tax deducted from interest on amount paid to non residents during 1st, April - 30th, June Form No: 27

31st August:
filing of income tax return if
(i) Assessee is not a corporate/ cooperative
(ii) There is no need of auditing accounts under any law
(iii) Total income includes income through business or other profession. Form No: 2

15th September:
In case of other than company/ corporate: Payment of 1st installment of advance income tax In case of a company/ corporate: Payment of 2nd installment of advance income tax

14th October:
Submitting date for the statement of deduction of tax interest, dividend and other amount paid to non resident during 1st July - 30th September. Form No: 27

31st October:
(i) In case of non corporate: Submitting auditing report under section 44AB of Income Tax Act. Form No: 3CA, 3CB, 3CC, 3CD, 3CE
(ii) In case of cooperative/ non corporate: filing of income tax return of the relevant assessment year if it require to get his account audited under Income Tax Act. Form No: 2
filing of half yearly return against tax collected during 1st April - 30th September Form No: 27EA, 27EB, 27EC, 27ED Date of submission of annual audited account for approved programs under section 35 (2AA) of Income Tax Act 1961.

30th November:
In case of a company - filing of annual return with auditing report under section 44AB
For annual return filing: Form 1
For submitting auditing report: Form 3CA & 3CD

15th December:
In case of other than company - Payment of 2nd installment of advance for the financial year In case of a company - Payment of 3rd installment of advance for the financial year

Ref:Surfindia.com