📚 How Is Interest Calculated on a UK Student Loan Plan 2? | 英国学生贷款第二类还款计划利息怎么算
For anyone heading to a UK university, the student loan is the single largest financial commitment most young people will ever sign up to. Plan 2 is the repayment plan that most English undergraduates who started their course between 1 August 2016 and 31 July 2023 are on, and its interest rule is unusual: the rate you pay depends on how much you earn, not on how much you borrowed. This article explains the mechanism step by step, with worked numbers you can reproduce on a calculator or in a spreadsheet.
对任何准备去英国读本科的学生来说，学生贷款几乎是人生中签下的最大一笔金融承诺。第二类还款计划（Plan 2）适用于 2016 年 8 月 1 日至 2023 年 7 月 31 日之间入学的英格兰本科生，而它的利息规则很特别：利率取决于你的收入，而不是你借了多少钱。本文将一步步拆解这一机制，并给出你可以用计算器或表格软件复现的算例。
1. What Plan 2 Actually Is | 第二类还款计划到底是什么
Plan 2 is not a bank loan. It is a government-backed income-contingent repayment loan administered by the Student Loans Company (SLC). Two features define it. First, repayments are collected only when your income exceeds a threshold, and stop automatically if your income falls. Second, the interest rate is variable and linked to both inflation and your salary.
Plan 2 不是银行贷款，而是由政府担保、由学生贷款公司（SLC）管理的"收入挂钩型"还款贷款。它有两大特征：第一，只有收入超过起征门槛才需要还款，收入下降时还款自动停止；第二，利率是浮动的，同时与通货膨胀和你的工资挂钩。
Plan 2 covers tuition fee loans and maintenance loans for eligible students from England. Scottish students are on Plan 4, Northern Irish students on Plan 1, and students starting English courses from 1 August 2023 onwards are on the newer Plan 5. If you are unsure which plan you are on, check your SLC online account before doing any calculations.
Plan 2 涵盖英格兰符合条件学生的学费贷款和生活费贷款。苏格兰学生适用 Plan 4，北爱尔兰学生适用 Plan 1，而 2023 年 8 月 1 日起入读英格兰课程的学生适用更新的 Plan 5。如果不确定自己属于哪一类，先登录 SLC 在线账户确认，再做任何计算。
2. The Golden Rule: RPI Plus Up to 3% | 核心规则：RPI 加上最多 3%
The headline formula for Plan 2 interest is short. The base rate is RPI, the Retail Prices Index, measured in the March before the rate takes effect in the following September. On top of that, a further 0% to 3% is added, depending on your income.
Plan 2 利息的核心公式很短：基准利率是 RPI（零售物价指数），取值为利率生效前一年 3 月的数值（利率在当年 9 月生效）。在此之上，再根据你的收入加收 0% 到 3% 的浮动部分。
Plan 2 interest rate = RPI + 0% to 3%
RPI is used even though it is no longer classified as a national statistic, because the loan regulations written in 2016 named it explicitly. The March RPI figure is locked in and applied for the whole academic year from 1 September to 31 August, so the rate changes once a year, not monthly.
虽然 RPI 已不再被列为国家官方统计指标，但学生贷款条例在 2016 年明确指定了它作为基准。当年 3 月的 RPI 数值被锁定，并适用于 9 月 1 日至次年 8 月 31 日的整个学年，所以利率一年只变一次，不是每月变动。
3. Three Phases of Interest | 利息的三个阶段
The most common mistake is assuming one rate applies for the whole life of the loan. In fact, your interest rate moves through three distinct phases.
最常见的误解是认为整个贷款期只有一个利率。事实上，你的利率会经历三个截然不同的阶段。
Phase 1 - While you study, and until the April after you leave your course: the full rate, RPI + 3%, applies regardless of your income. You are earning nothing, yet this is the period of highest interest.
阶段一——在读期间，直到你离校后那年 4 月：无论收入多少，一律按最高利率 RPI + 3% 计息。此时你几乎没有收入，却承受着最高的利率。
Phase 2 - From that April onwards: the extra 3% becomes income-dependent, sliding from 0% up to 3%. This is the phase that matters for most of your working life.
阶段二——从该年 4 月起：额外的 3% 变成与收入挂钩，从 0% 线性上升到 3%。这是影响你大部分职业生涯的阶段。
Phase 3 - After 30 years: any remaining balance, including all unpaid interest, is written off. Nothing is inherited by your family, and the write-off is not treated as taxable income.
阶段三——30 年之后：剩余余额（包括所有未付利息）全部核销。这笔债务不会被家人继承，核销金额也不视为应税收入。
4. The Sliding Scale Formula | 浮动利率公式
Once Phase 2 begins, the extra interest is calculated by a linear interpolation between two income thresholds. Let I be your gross annual income, L the repayment threshold, and U the upper threshold at which the full 3% is reached. In recent years U has been set at roughly 1.8 times L.
进入阶段二后，额外利息在两个收入门槛之间做线性插值。设 I 为你的税前年收入，L 为还款起征门槛，U 为达到满额 3% 的上限门槛。近年来 U 大致被设定为 L 的 1.8 倍。
Extra interest = 3% × (I − L) ÷ (U − L)
The rule set can be summarised in three cases. Below L you pay RPI only. Between L and U you pay RPI plus the proportional slice. Above U you pay the maximum, RPI + 3%.
这条规则可以归纳为三种情形：收入低于 L，只付 RPI；收入介于 L 与 U 之间，付 RPI 加上按比例计算的那一部分；收入高于 U，付上限 RPI + 3%。
For illustration, use the verified 2022-23 and 2023-24 figures: L = £27,295 and U = £49
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