Class 3 NI Contributions - Correct Rates

I would like to pay Class 3 National Insurance contributions for the years from April 2017 to April 2024, but cannot ascertain the correct rates for each year as the information on HMRC's website is contradictory. See the following sources. https://www.gov.uk/voluntary-national-insurance-contributions/rates [1] 'The rates for the 2023 to 2024 tax year are … £17.45 a week for Class 3.' 'If the gap in your National Insurance record was between 6 April 2016 and 5 April 2023, you’ll pay the rates that applied in the 2022 to 2023 tax year.' '£15.85 a week for Class 3.' https://www.gov.uk/government/publications/rates-and-allowances-national-insurance-contributions/rates-and-allowances-national-insurance-contributions#class-3-national-insurance-voluntary [2] 'If you’re paying voluntary contributions for the previous 2 tax years (2022 to 2023 or 2021 to 2022), you’ll pay the original rates for those years. For all other years you’ll pay the current rate (2023 to 2024).' [3] '£ per week, Class 3 rate / 2023 to 2024 £17.45, 2022 to 2023 £15.85, 2021 to 2022 £15.40, 2020 to 2021 £15.30.' This gives us the following possible rates. 2023-24 £17.45 2022-23 £15.85 2021-22 [1] £15.85 or [2,3] £15.40 2020-21 [1] £15.85 or [2] £17.45 or [3] £15.30 2019-20 [1] £15.85 or [2,3] £17.45 2018-19 [1] £15.85 or [2,3] £17.45 2017-18 [1] £15.85 or [2,3] £17.45 Please could you confirm what the correct weekly rates are for me to pay for each of these years and the reason for the discrepancy. Kind Regards

Hi,

Voluntary class 3 National Insurance contributions for the:

• 2017 to 2018 to 2019-2020 tax year are £15.85 a week (£824.20 a year). Payment should be received by 5 April  2025.
• 2020 to 2021 tax year are £15.30 a week (£795.60 a year). Payment should be received by 5 April 2025.
• 2021 to 2022 tax year are £15.40 a week (£800.80 a year). Payment should be received by 5 April 2025.
• 2022 to 2023 tax year are £15.85 a week (£824.20 a year). Payment should be received by 5 April 2025.
• 2023 to 2024 tax year are £17.45 a week (£907.40 a year). Payment should be received by 5 April 2026.

Thank you.