# The Teachers' Superannuation (Consolidation) Regulations 1988, Paragraph 9


(1) Subject to paragraphs 10 to 12, the additional contributions consist of a lump sum of A×B×C, where—
A is the length of the past period, expressed in years and any fraction of a year,
B is the annual rate of the person’s contributable salary at the date on which notice of the election was given, and
C is the percentage ascertained from Table 3 below.
TABLE 3
Age of date of election
Percentage
under 23
29.53
23
28.50
24
27.47
25
26.45
26
25.43
27
24.54
28
23.77
29
23.12
30
22.57
31
22.10
32
21.67
33
21.27
34
20.92
35
20.62
36
20.37
37
20.19
38
20.05
39
19.97
40
19.91
41
19.96
42
19.84
43
19.86
44
19.89
45
19.92
46
19.96
47
20.02
48
20.11
49
20.22
50
20.36
51
20.52
52
20.69
53
20.86
54
21.04
55
21.22
56
21.52
57
22.02
58
22.72
59
23.52
60
24.39
61
23.88
62
23.37
63
22.86
64
22.34
65
21.81
66
21.29
67
20.76
68
20.24
69
19.71
(2) If the lump sum is not paid within one month after the date on which the election became irrevocable under regulation C3(13) the election ceases to have effect.

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Source: https://www.legislation.gov.uk/uksi/1988/1652/schedule/4/paragraph/9 (the official version)
Page: https://openlegislation.uk/teachers-superannuation-consolidation-regulations-1988/schedule-4/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.