| Section 1(1), (2), (6) and (7) | Amendments relating to contributions | 25th April 1977 |
| Section 1(4) | Amendment of paragraph 4(a) of Schedule 1 to the Social Security Act 1975 | 6th April 1978 |
| Section 3 | Increments of retirement pension for deferred retirement etc. | 25th April 1977 |
| Section 4(3) and (4) | Other amendments relating to retirement pensions | 25th April 1977 |
| Section 6 | Review of earnings rule operation | 25th April 1977 |
| Section 8(1) and (2) | Increase of benefit for children in cases of partial satisfaction of contribution conditions | 6th April 1979 |
| Section 8(3) | Increase of invalidity pension for wives and women with care of children in cases of partial satisfaction of contribution conditions | 25th April 1977 |
| Section 10 and Schedule 1 | Revocation of Silicosis Schemes and abolition of boards administering Pneumoconiosis etc. and Supplementation Schemes | 1st July 1977 |
| Section 11 | Miscellaneous amendments of the Industrial Injuries and Diseases (Old Cases) Act 1975 | 1st July 1977 |
| Section 12 | Exercise by Order in Council of existing powers relating to benefits for death or disablement through service in the armed forces | 25th April 1977 |
| Section 13 | Mobility allowances for certain persons eligible for invalid carriages | 25th April 1977 |
| Section 14(4) to (7) and (9) | Amendments of the Supplementary Benefits Act 1976 | 25th April 1977 |
| Section 17(1) | Requalification for unemployment benefit | 3rd April 1978 |
| Section 17(2) | Treating claim for one benefit as a claim also for another benefit | 25th April 1977 |
| Section 17(4) and (5) | Provisions relating to the payment of child benefit under the Child Benefit Act 1975 | 25th April 1977 |
| Section 17(6) | Calculation of rate of invalidity pension under section 15 of the Social Security Pensions Act 1975 in certain cases | 6th April 1979 |
| Section 19 | Inspectors for the purposes of the Family Income Supplements Act 1970 and the Supplementary Benefits Act 1976 | 25th April 1977 |
| Section 20 | Modifications of the Social Security Act 1975, the Child Benefit Act 1975 and the Social Security (Northern Ireland) Act 1975 in connection with reciprocal agreements | 25th April 1977 |
| Section 21 | Calculation of guaranteed minimum pensions preserved under approved arrangements | 6th April 1978 |
| Section 22(1) | Circumstances in which a person is to be treated as residing or not residing with another person | 27th June 1977 |
| Section 22(2) and (4) | Substitution of words “living together as husband and wife” for words “co-habiting as man and wife” in the Social Security Act 1975 | 25th April 1977 |
| Section 22(5) | Amendment of section 93(1) of the Social Security Act 1975 (principal questions for determination by Secretary of State) | 25th April 1977 |
| Section 22(6) | Amendment of section 164 of the Social Security Act 1975 (disclosure of information by Inland Revenue) | 25th April 1977 |
| Section 22(7), (8), (11), (12) and (14) | Amendments relating to contracted-out employment under the Social Security Pensions Act 1975 | 25th April 1977 |
| Section 22(9), (10) and (13) | Further amendments relating to contracted-out employment under the Social Security Pensions Act 1975 | 6th April 1978 |
| Section 22(15) | Amendment of the Tribunals and Inquiries Act 1971 | 25th April 1977 |
| Section 22(16) | Amendments of the Family Income Supplements Act 1970 | 25th April 1977 |
| Section 23 | Financial provisions | 25th April 1977 |
| Section 24(6) and Schedule 2 | Repeal of— |
| (a) provisions of the Tribunals and Inquiries Act 1971 | 25th April 1977 |
| (b) provisions of the Social Security Act 1975— |
| (i) sections 1(5) (part) and 129(3) | 25th April 1977 |
| (ii) words in Schedule 20 | 27th June 1977 |
| (c) provisions of the Social Security (Northern Ireland) Act 1975 | 25th April 1977 |
| (d) provisions of the Industrial Injuries and Diseases (Old Cases) Act 1975 | 1st July 1977 |
| (e) provisions of the Social Security Pensions Act 1975 | 25th April 1977 |
| (f) section 40(3) of the Employment Protection Act 1975 | 25th April 1977 |
| (g) section 29 of the Supplementary Benefits Act 1976 | 25th April 1977 |