Postgraduate Loans

UK Postgraduate Loan Repayment Explained: How It Stacks with Undergraduate

Postgraduate loans aren't extensions of undergraduate loans—they're independent products with separate thresholds and repayment rules. Understand the "double deduction" mechanism to avoid budgeting surprises.

5 min read Postgraduate Finance Specialist Updated Jan 2026

Many master's and PhD graduates are shocked to see two student loan deductions on their payslip. This is because postgraduate loans run parallel to undergraduate loans with different thresholds and rates. Here's the often-overlooked "double hit."

Postgraduate Loan Core Mechanics

Postgraduate loans, introduced in 2016, are independent products with key features:

Separate Threshold: £21,000/year
Lower Interest: RPI+3%
6% Repayment Rate
30-Year Write-Off
Independent Tracking: Balance and repayment history are separate

Regional Differences: Scotland is the Exception

Scotland's postgraduate loan system is fundamentally different:

Scottish Advantage: Single Deduction

Scottish postgraduate loans are integrated into Plan 4, not separate. You have £45k undergrad + £15k postgrad? Still just 9% total above £31,395 threshold. This avoids England's "double hit."

Management Strategies & Common Pitfalls

Strategy 1: Combined Modelling

Never use undergraduate calculators alone. Must use multi-loan calculators or your budget will be significantly underestimated.

Strategy 2: Voluntary Repayment Priority

If you decide to overpay (not recommended), prioritize the higher-rate loan:

Compare postgraduate vs undergraduate interest rates
Postgraduate (RPI+3%) is usually lower than Plan 2
But undergraduate balance is typically larger with stronger compounding
Check SLC policy on how voluntary repayments are allocated

Pitfall 1: Ignoring Postgraduate Threshold Freeze

Postgraduate threshold frozen at £21,000 until 2025/26, while undergraduate thresholds rise with inflation. This means your postgraduate repayment effectively increases in real terms.

Pitfall 2: Thinking Total Debt Affects Credit

Like undergraduate loans, postgraduate loans don't appear on credit reports. Banks only care about total monthly deductions.

Postgraduate Loan FAQ

Does postgraduate loan affect undergraduate write-off?

No. They're completely separate products with independent write-off schedules. One being written off doesn't affect the other.

Can I repay only postgraduate loan and not undergraduate?

No. PAYE deducts both simultaneously based on respective thresholds. Voluntary payments can be specified, but usually go to the highest-rate loan first.

Are postgraduate loan interest rates usually higher?

Actually typically lower. Postgraduate is RPI+3%, while Plan 2 undergrad is RPI+up to 3%—in practice, undergraduate rates are higher.

Are PhD loan rules the same?

Yes, PhD loans are also postgraduate loans with identical rules, just higher limits (£27,000+).

Scotland Special Rules

Why the "Expiry Date" is the most important factor for Plan 2 and Plan 5 loans.

Complete UK Student Loan Interest Guide

Plan 2 vs Plan 5 interest mechanics explained