Trust & methodology
Official sources
Primary citations used to verify the student loan rules behind this calculator. Sources were last checked on 27 August 2026.
01
How sources are chosen
Student loan rules are the primary subject of this site. When encoding thresholds, interest, write-off policy and related assumptions, the project prioritises official material from GOV.UK, the Student Loans Company or Department for Education, Scottish/SAAS terms where Plan 4 is concerned, HMRC employer guidance for payroll collection, and Bank of England or ONS releases where interest inputs depend on Bank Rate or inflation measures.
Inclusion of a source here does not mean every calculator page, guide or projection uses every citation. Some sources support background verification, employer collection context, or Scotland-specific terms even when a given screen focuses on a narrower product.
For how those rules are turned into estimates, read the methodology page.
02
Repayment plans and thresholds
03
Interest
- How interest is calculated – Plan 1
gov.uk · Last updated 1 Sep 2025
- How interest is calculated – Plan 2
gov.uk · Last updated 6 Apr 2026
- How interest is calculated – Plan 4
gov.uk
- How interest is calculated – Plan 5
gov.uk · Last updated 1 Sep 2025
- How interest is calculated – Postgraduate Loan
gov.uk · Last updated 1 Sep 2025
- Interest rate cap introduced to protect Plan 2 borrowers
gov.uk
- Student Loans Interest Rates and Repayment Threshold Announcement
gov.uk · Published 19 Aug 2025
04
Write-off and cancellation
05
Employer and payroll collection
- Student loan and postgraduate loan repayment guidance for employers
gov.uk
- Rates and thresholds for employers 2025 to 2026
gov.uk · Published 31 Jan 2025; last updated 1 Mar 2026
- Collection of student loans from 6 April 2026
gov.uk
06
Scotland and Plan 4
07
Economic inputs
- Consumer price inflation, UK: March 2026
ons.gov.uk
- Official Bank Rate history
bankofengland.co.uk
08
Last checked
The central source audit date for this registry is 27 August 2026. Rule updates should be reviewed against primary publications and covered by tests before the live calculator snapshot advances.
Open the student loan calculator to use the current verified assumptions.