Check if any tax/pension rates etc need updating from the new tax year

This is a scheduled issue to check for and implement any changes arising from the 2026-2027 tax year

Please note, whoever picks this issue up should create a copy of this issue for 2027 with a due date set to 2027-04-05

Technical Notes

It's unclear exactly what changes there might be - we will need to analyse it at the time

Note: By the time this comes around, we hope that the salary data will be directly uploaded into the salary with on-costs service from HR, rather than us importing it manually, and Research Dashboard will use the API on the on-costs service for performing its calculations. This ticket exists in case other priorities have prevented us from doing that before then