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Saturday, 30 May 2026

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Does ISA Interest Count Towards Student Loan Repayments?

Because ISA interest is tax-free, it doesn't count as taxable income — and student loan repayments are based only on taxable earnings. So money you earn inside an ISA never raises your repayments, making ISAs a tidy option for graduates saving on the side.

Last reviewed:  · 2 min read

Key Facts

  • Student loan repayments are based on taxable income only
  • ISA interest and gains are tax-free, so they don't count
  • Savings interest outside an ISA could in theory affect repayments

Why ISA interest is invisible to repayments

Your student loan repayment is worked out as 9% of your taxable income above the threshold. ISA interest and investment gains are tax-free, so they never appear as taxable income — which means they can't push up your repayments however much you earn inside the ISA.

Savings held outside an ISA generate taxable interest, which in some cases counts towards your income. So sheltering savings in an ISA keeps them out of the repayment calculation entirely.

Why this matters for graduates

If you're a graduate repaying a loan and building savings, an ISA does two helpful things: it keeps your interest tax-free, and it keeps that interest from ever nudging your loan repayments higher.

It's a small but neat advantage. For most people the effect on repayments is minor, but the tax-free status alone makes an ISA worth using for savings you'd otherwise hold in a taxable account.

FAQ

Frequently Asked Questions

Will my savings increase my student loan repayments? +
Savings interest held outside an ISA can count as taxable income, which in principle feeds into the repayment calculation. Interest earned inside an ISA is tax-free and never counts. For most people the amounts are small, but using an ISA keeps things simple and tax-efficient.
Should graduates prioritise an ISA over overpaying their loan? +
Often yes. Because student loans are written off eventually and repayments depend on income rather than the balance, building tax-free savings in an ISA is usually a better use of spare money than overpaying a loan you may never fully repay. Only high earners certain to clear the loan should consider overpaying.
Does a Lifetime ISA affect student loan repayments? +
No. Like other ISAs, any bonus, interest or growth inside a Lifetime ISA is tax-free and doesn't count as taxable income, so it has no effect on your student loan repayments. The LISA's main consideration is its withdrawal rules, not your loan.

Topics covered

isas student loans graduates

This article is for informational purposes only and does not constitute financial advice. Always do your own research or speak to a qualified financial adviser before making financial decisions.