Plan 5 Student Loan Explained: What It Means for Take-Home Pay

Why Plan 5 changes salary comparisons

Plan 5 affects the practical value of a pay rise because repayments are calculated on income above a threshold. On paper, two offers can look close on gross salary, yet the monthly net gap can narrow once deductions are applied.

The common mistake is to compare gross salary only. A better method is to compare monthly net pay using matched assumptions for region, tax code and pension. This gives a truer picture of disposable income.

For people early in their career, where annual earnings are moving quickly, Plan 5 can become relevant soon after promotion. Modelling this early avoids surprises on first post-raise payslips.

• Gross salary does not equal usable monthly cash.
• Loan plan selection can materially change the result.
• Compare offers with identical assumptions.

How to model Plan 5 correctly in practice

Start with your expected gross salary and choose the right tax region. Then set student loan to Plan 5 and test with your real pension contribution. This gives a realistic baseline for negotiations and budgeting.

If your role includes variable pay, run a conservative and optimistic scenario. Using one single number can understate risk when income fluctuates during the tax year.

When reviewing a role change, use monthly net delta as the decision metric. It is easier to map to rent, bills and savings targets than annual gross figures.

• Use your real pension contribution, not a default value.
• Test at least two salary scenarios if bonus is likely.
• Use monthly net delta for decision making.

What to check if payslip and calculator differ

Small differences between an online estimate and payroll are normal. Payroll runs on period-specific data and may include adjustments that a planning tool does not have.

Large differences usually come from one of four causes: incorrect loan plan, different tax code, pension mismatch, or a one-off pay item. Check these first before assuming your estimate is wrong.

Use your payslip as the final record and this guide as a planning framework. The strongest approach is to keep assumptions explicit and consistent across all offer comparisons.

• Validate student loan plan and tax code first.
• Confirm pension basis and salary sacrifice setting.
• Expect small monthly variance when bonus timing changes.

Plan 5 and progression planning

Plan 5 is most useful when treated as a monthly cashflow variable in progression planning. Compare current role versus proposed role with the same plan assumptions.

If your package includes bonus, model base salary and bonus separately so budgeting stays dependable.

• Use matched Plan 5 assumptions across offers.
• Separate base salary from bonus for planning.
• Prioritise dependable monthly net in decisions.

Plan 5: the key numbers and how it differs from Plan 2

Plan 5 applies to students who started undergraduate courses in England from August 2023. The repayment threshold is £25,000/year, lower than Plan 2's £27,295 but higher than Plan 1's £24,990. The repayment rate is 9% of earnings above the threshold, identical to Plans 1 and 2. The key difference is the repayment term: Plan 5 has a 40-year repayment window before write-off (compared to 30 years for Plan 2 and 25 years for Plan 1), meaning lower-earning graduates are more likely to repay in full before write-off under Plan 5.

At a £28,000 salary with Plan 5: repayment = 9% × (£28,000 − £25,000) = 9% × £3,000 = £270/year (£22.50/month). With Plan 2 at the same salary: 9% × (£28,000 − £27,295) = 9% × £705 = £63/year (£5.25/month). Plan 5 costs £207/year more at this salary level. At £35,000 with Plan 5: 9% × (£35,000 − £25,000) = £900/year (£75/month). With Plan 2: 9% × (£35,000 − £27,295) = £693/year (£57.75/month). Plan 5 costs £207/year more at £35,000 too, because the threshold difference is constant at £2,295.

The annual difference between Plan 5 and Plan 2 is always approximately £207 at any given salary level above both thresholds (9% × £2,295 threshold difference = £206.55/year). This remains constant across salary levels, it does not widen as salary increases. At £60,000 with both plans above their thresholds, the difference is still £207/year (£17.25/month). The practical impact: Plan 5 graduates see a slightly lower net pay each month, but the gap is modest and predictable.

• Plan 5 threshold: £25,000/year (Plan 2 is £27,295).
• Plan 5 repayment term: 40 years (Plan 2 is 30 years).
• Annual difference between Plan 5 and Plan 2: approximately £207/year at any salary.
• Plan 5 monthly cost is approximately £17/month more than Plan 2.

Does it ever make sense to voluntarily overpay a student loan?

Voluntary overpayments on student loans reduce the outstanding balance but do not change the monthly repayment amount, because repayments are always income-contingent at 9% above the threshold. The only way voluntary overpayments help is if you are likely to repay the loan in full before write-off (i.e. your earnings are high enough that accumulated repayments will clear the balance before 40 years).

For Plan 5 graduates, the 40-year window and current student debt levels (typically £40,000–£50,000 at graduation) mean many middle-income earners will clear the debt through regular repayments alone. However, high earners in medicine, law, finance or tech who will consistently earn £70,000+ are likely to repay in full under mandatory repayments within 15–20 years. For those borrowers, voluntary overpayment when they have surplus cash is not obviously irrational.

For most graduates on average UK salaries of £30,000–£50,000, voluntary overpayment is widely considered a poor financial decision. The interest rate on Plan 5 loans is set at the Retail Price Index (RPI) plus 0 percentage points during study and after graduation (the interest rate is being simplified for Plan 5). With debt that may be written off at 40 years anyway, repaying faster reduces a liability that might never be fully repaid regardless, and the money could grow faster invested elsewhere.

• Voluntary overpayments do not reduce monthly repayment amount.
• Only beneficial if you are on track to repay in full before write-off.
• Plan 5 write-off: 40 years, most average earners will not repay in full.
• High earners (£70k+) are most likely to benefit from monitoring repayment trajectory.