Student Loan's Not Being Written Off When Adding Multiple Loans

Firstly, thank you for the excellent tool!

I believe there may be an error regarding applying that the loan should be written off, if multiple loans are involved.

For example, with the following example parameters:

Annual Income: £50000

Plan 1: Current Loan Balance - 25000; Graduation Date 2010

The tool will estimate that the Plan 1 loan will be written off in April 2036, which seems correct.

If you add the following Plan 2 loan:

Plan 2: Current Loan Balance - 25000; Graduation Date 2020

The tool will now estimate that the Plan 1 loan will be paid off in March 2046, ignoring that it should be written off still in April 2036.

Would appreciate if this could be looked into!