Capital gains tax - qq

[DoodleMum12]

Very quick question. I sold some shares and am just slightly over the 6k threshold on profit. Do I pay the tax now through hmrc or wait until April?

https://www.gov.uk/report-and-pay-your-capital-gains-tax/if-you-have-other-capital-gains-to-report#:~:text=You%20must%20report%20by%2031,pay%20by%2031%20January%202025.

Thank you