Understanding Student Loan Deductions on Your Payslip

Where to Find the Student Loan Deduction on Your Payslip

When you receive your monthly or weekly payslip, you will see a deductions section that lists everything taken from your gross pay before you receive your net (take-home) pay. The most common deductions are income tax and National Insurance contributions. If you have a student loan and your earnings are above the repayment threshold, you will also see a line for your student loan deduction.

The label used varies between employers and payroll systems. Some payslips show it as "Student Loan", others use the abbreviation "SL", and some display the specific plan code such as "SL1" or "SL2". If you have a Postgraduate Loan, it may appear separately as "PGL" or "Postgrad Loan". The key thing to look for is a deduction that is separate from your tax and National Insurance — student loan repayments are not a tax, even though they are collected through the tax system.

If you cannot find any student loan deduction on your payslip despite earning above the threshold, it may be that your employer has not yet received a start notice from HMRC. This can happen if you have recently started a new job or if HMRC's records are not up to date. In this case, your employer is not at fault — they can only deduct student loan repayments when instructed to do so by HMRC. You can check your status through your Student Loans Company online account.

Plan Codes Explained: SL1, SL2, SL4, and PGL

The plan code on your payslip determines which repayment threshold and rules apply to your deductions. Getting the right code is crucial because each plan has a different threshold, and being on the wrong plan means you could be over-paying or under-paying each month.

SL1 — Plan 1

Plan 1 applies to English and Welsh students who started their course before 1 September 2012, and to all Northern Irish students. The annual repayment threshold is £26,900, which works out to approximately £2,241.67 per month or £517 per week. You repay 9% of everything you earn above this threshold. If your payslip shows "SL1", your employer is applying Plan 1 rules. The interest rate on Plan 1 loans is currently 3.2%.

SL2 — Plan 2

Plan 2 is the most common plan for graduates in England and Wales who started university from September 2012 onward. The annual threshold is £29,385, equivalent to roughly £2,448.75 per month. The repayment rate is 9% above the threshold. Interest on Plan 2 loans varies between 3.2% and 6.2% depending on your income — at the threshold you pay RPI, and at incomes above approximately £52,885 you pay RPI plus 3%. If your payslip shows "SL2", you are on Plan 2.

SL4 — Plan 4

Plan 4 is for Scottish students who took out loans from the Student Awards Agency Scotland (SAAS). The annual threshold is £33,795, the highest of all undergraduate plans, which means you start repaying at a higher income level. The monthly equivalent is about £2,816. Repayments are 9% above the threshold and the interest rate is 3.2%. If your payslip shows "SL4", your employer is deducting under Plan 4 rules.

PGL — Postgraduate Loan

If you took out a Postgraduate Loan for a master's or doctoral course from 2016 onward, your payslip may show a "PGL" deduction. This is separate from any undergraduate loan repayment and has its own threshold of £21,000 per year (about £1,750 per month). The repayment rate is 6% of income above the threshold — lower than the 9% for undergraduate plans. If you have both an undergraduate and a postgraduate loan, you will see two separate deductions: one for SL1, SL2, or SL4, and another for PGL. The interest rate on Postgraduate Loans is currently 6.2%.

How the Monthly Calculation Works

Your employer calculates your student loan deduction each pay period using the monthly (or weekly) equivalent of your plan's annual threshold. The calculation is straightforward, but understanding it allows you to verify that your payslip is correct.

For a monthly-paid employee on Plan 2, the steps are as follows. First, take your gross pay for the month — this is your pay before any deductions, including salary sacrifice pension contributions in most cases. Second, subtract the monthly threshold of £2,448.75. If your gross pay is below this figure, no deduction is made. Third, multiply the amount above the threshold by 9% (or 6% for PGL). Fourth, round down to the nearest pound. That figure is your student loan deduction for the month.

It is important to note that the calculation is based on your gross pay in each individual pay period, not on your annual salary. This means that if you receive a bonus, overtime pay, or commission in one month, your student loan deduction will be higher for that month because your gross pay is higher. Conversely, if you take unpaid leave and your gross pay falls below the threshold for a month, no deduction is made that month.

For weekly-paid employees, the calculation is identical except the weekly threshold is used instead. The weekly Plan 2 threshold is approximately £565. Part-time employees are treated the same way — the deduction is based on actual gross pay compared with the period threshold, regardless of contracted hours.

Checking If Your Deduction Is Correct

Every month, you should glance at your payslip to make sure the student loan deduction looks right. You do not need to do complex maths — a rough mental check is usually sufficient. Take your gross pay, subtract the monthly threshold for your plan, and multiply by 9%. If the figure on your payslip is close to that, everything is in order.

Common reasons for an incorrect deduction include the wrong plan code being applied, the employer using outdated thresholds from a previous tax year, or the employer not having received a start notice from HMRC. If you have recently repaid your loan in full and deductions are still being made, your employer may not yet have received the stop notice. In all these cases, the first step is to check your tax code and SL notice status with HMRC.

It is also worth checking at the start of each new tax year in April, because thresholds are updated annually. If your employer does not apply the new threshold promptly, your deductions for April and May may be slightly too high or too low. Any over-deduction during the year is corrected when HMRC reconciles your account, but it can take months for a refund to arrive.

What to Do If You Are Being Deducted Incorrectly

If you believe your student loan deduction is wrong, there are several steps you can take depending on the nature of the error.

Wrong plan code: If your payslip shows SL1 but you should be on SL2 (or vice versa), contact HMRC to correct the plan type. Your employer cannot change this themselves — they follow the instructions on the start notice issued by HMRC. You can call HMRC's Income Tax helpline or use your Personal Tax Account online to report the issue. Once HMRC issues a corrected notice, your employer will update their payroll.

Deductions when you earn below the threshold: If your gross pay is below the threshold but a deduction is still being made, raise this directly with your employer's payroll department. This is usually a payroll processing error and can be corrected quickly with a refund in your next pay packet.

Deductions after your loan is fully repaid: If you have repaid your loan in full but deductions continue, contact the Student Loans Company to confirm the loan is closed. They will ask HMRC to issue a stop notice to your employer. Any overpayments will be refunded, although this can take up to several weeks. To avoid this situation, the SLC recommends switching to direct debit for your final year of repayments so you can stop payments as soon as the balance reaches zero.

Deductions not being made when they should be: If you earn above the threshold but no student loan deduction appears on your payslip, HMRC may not have sent a start notice to your employer. This can happen when you start a new job. Contact HMRC to ensure they have your correct employer details. Your employer will begin deducting once they receive the notice.

Your P60 and End-of-Year Summary

At the end of each tax year (5 April), your employer provides you with a P60 certificate. This document summarises your total pay, tax, National Insurance, and student loan deductions for the year. The student loan figure on your P60 should match the sum of all your monthly student loan deductions from your payslips throughout the year.

Your P60 is an important document for verifying that the right total amount was deducted. If the P60 figure does not match the sum of your payslip deductions, there may have been an error in one or more months that needs investigating. Keep your P60 safe — it serves as proof of repayment and can be useful if you ever need to dispute a balance with the Student Loans Company.

Your employer also reports your student loan deductions to HMRC through the Real Time Information (RTI) system each time you are paid. HMRC passes this information to the Student Loans Company, which updates your loan balance accordingly. There can be a delay of several weeks between a deduction appearing on your payslip and the SLC updating your online account balance, so do not be alarmed if the figures do not match immediately.

Example Payslip Breakdown

To bring all of this together, here is a worked example for a graduate on Plan 2 earning £36,000 per year (£3,000 gross per month). This example shows how the student loan deduction fits alongside other deductions to arrive at take-home pay.

Gross Pay: £3,000.00. This is the starting point — your total pay before any deductions. It includes basic salary and any additional payments such as overtime or bonuses for that month.

Income Tax: £286.00. Calculated on taxable income after your Personal Allowance. With the standard tax-free allowance of £12,570 per year (£1,047.50 per month), taxable income is £1,952.50, taxed at 20% to give approximately £390, minus any adjustments. The exact figure depends on your tax code.

National Insurance: £178.36. Employees pay NI at 8% on earnings between the primary threshold (approximately £1,048 per month) and the upper earnings limit (approximately £4,189 per month). On a £3,000 salary, this is roughly 8% of £1,952 which equals about £156, though the precise figure depends on the thresholds in force and any rounding rules.

Student Loan (SL2): £49.00. Calculated as 9% of the amount above the Plan 2 monthly threshold: £3,000 minus £2,448.75 equals £551.25. Multiply by 9% to get £49.61, rounded down to £49. This is the figure that appears on the payslip.

Net Pay (Take-Home): £2,479.64. This is what lands in your bank account: gross pay minus income tax, minus National Insurance, minus student loan deduction. If you also have workplace pension contributions, those would appear as an additional deduction line.

Understanding this breakdown helps you see that the student loan deduction is usually a relatively small proportion of total deductions — in this case, about £49 out of £513 in total deductions. It is also fully proportional to your income, so if your pay rises or falls, the deduction adjusts automatically the following month. You can use our student loan calculator to see how your deduction amount changes at different salary levels.

Salary Sacrifice and Student Loans

If your employer offers salary sacrifice arrangements — for example, for pension contributions, cycle-to-work schemes, or childcare vouchers — this can affect your student loan deduction. Salary sacrifice reduces your gross pay before deductions are calculated. A lower gross pay means a smaller (or zero) student loan deduction for that month.

For example, if your gross pay is £3,000 and you sacrifice £200 for a pension, your pay for student loan purposes becomes £2,800. On Plan 2, your deduction would then be 9% of (£2,800 minus £2,448.75) which is 9% of £351.25, equalling about £31 instead of £49. This is a legitimate and automatic reduction — you do not need to do anything special. It is worth bearing in mind that while salary sacrifice reduces your loan repayments, it also extends the time to repayment. Whether this is beneficial depends on whether you are on track to repay in full before the write-off date.

Key Takeaways

• Your student loan deduction appears in the deductions section of your payslip, labelled SL1, SL2, SL4, or PGL.
• The deduction is 9% of gross pay above your plan's monthly threshold (6% for Postgraduate Loans).
• Check your deduction each month with a quick mental calculation.
• If the wrong plan code is applied, contact HMRC — not your employer.
• Your P60 shows total student loan deductions for the tax year.
• Salary sacrifice reduces your gross pay and therefore your student loan deduction.
• If deductions continue after your loan is repaid, contact the SLC for a stop notice and refund.