IPSA has confirmed the budgets for MPs’ offices for 2022-2023 and you can read the bulletin here: https://assets.ctfassets.net/s90k6prbkeee/3Qh3dqtF4hBC3WpZ2ADrMi/65f374248b72727a3154424b2a77f5e3/Bulletin__2_March_2022.pdf

and the finer details here: https://www.ipsaonline.org.uk/guidance/reports-and-budgeting#summary-of-2022-23-budgets

You can find an updated monthly and yearly salary calculator here: https://www.ipsaonline.org.uk/guidance/reports-and-budgeting#document-downloads