📚 Plan 4 Student Loans and Overseas Income: Why Repayment Thresholds Differ by Country | 第四类学生贷款与海外收入：为何各国还款门槛不同
Most students assume that a student loan is a single national contract with one repayment rule. In reality the UK runs a family of loan plans, and the one usually called the 'fourth type' - Plan 4, the Scottish plan - does not use one threshold for the whole world. It uses a different threshold for almost every country in which a graduate might work, and those thresholds can be three or four times apart. This article explains the mechanism, the economics behind it, and how to avoid being overcharged.
大多数学生以为学生贷款是一份全国统一的合同、只有一条还款规则。事实上英国运行的是一整套贷款计划，而通常被称作“第四类”的 Plan 4（苏格兰计划）并不对全世界使用同一个门槛。它几乎为毕业生可能工作的每一个国家都设定了不同门槛，而这些门槛之间可能相差三到四倍。本文将解释其中的机制、背后的经济学逻辑，以及如何避免被多扣款。
1. What 'Plan 4' Actually Means | “第四类”到底指什么
The UK student loan system is split by nation and by the year a course started, not by the university's ranking. Plan 1 covers the oldest loans, Plan 2 covers England and Wales from 2012 to 2023, Plan 4 is the Scottish plan for courses starting from 2021-22, Plan 5 covers England from August 2023, and the Postgraduate Loan sits alongside them all. When a textbook or a news report says 'the fourth type of student loan', it is almost always referring to Plan 4: the loans funded by the Student Awards Agency Scotland (SAAS) and collected by the Student Loans Company (SLC).
英国的学生贷款体系是按地区以及课程开始年份划分的，而不是按大学排名划分。Plan 1 覆盖最早的一批贷款，Plan 2 覆盖 2012 至 2023 年间的英格兰与威尔士，Plan 4 是苏格兰计划，适用于 2021-22 学年起开始的课程，Plan 5 覆盖 2023 年 8 月起的英格兰，研究生贷款则与它们并行存在。当教材或新闻报道提到“第四类学生贷款”时，几乎总是指 Plan 4：由苏格兰学生奖励局（SAAS）发放、由学生贷款公司（SLC）回收的那一类贷款。
The practical consequence is that two graduates with identical salaries can owe completely different monthly amounts. A Plan 2 borrower in Tokyo and a Plan 4 borrower in Tokyo are assessed against two different country tables, because each plan has its own domestic threshold and therefore its own overseas threshold set.
实际后果是：两位薪水完全相同的毕业生，每月应还金额可能完全不同。同在东京工作的 Plan 2 借款人和 Plan 4 借款人，会被套用两张不同的国家门槛表，因为每个计划都有自己的本土门槛，因而也有各自的一套海外门槛。
2. The Core Rule: You Repay Where You Earn | 核心规则：在哪里挣钱，就在哪里还款
For Plan 4 the arithmetic is simple and is applied everywhere in the world:
Annual repayment = 9% × (Annual income − Country threshold)
The complicated part is not the 9%. It is the definition of 'income' and the choice of 'country threshold'. Inside the UK, repayment is deducted automatically through PAYE and the threshold is the domestic Plan 4 figure. Outside the UK, there is no PAYE, so the borrower must self-certify their income to the SLC every year and pay directly by direct debit or bank transfer.
对 Plan 4 而言，算式很简单，而且在全世界都一样：
年还款额 = 9% × (年收入 − 所在国门槛)
复杂的不是那 9%，而是“收入”的定义和“所在国门槛”的选取。在英国境内，还款通过 PAYE 自动扣除，门槛就是 Plan 4 的本土数额。在英国境外没有 PAYE，借款人必须每年向 SLC 自行申报收入，并通过直接借记或银行转账直接付款。
Crucially, the trigger is the payroll and not the postcode. If you are physically in Japan but still paid by a UK employer through PAYE, you remain on the UK threshold. If you are paid into a Japanese payroll, you fall under the overseas assessment and the Japanese threshold applies - even if you left the UK only a few weeks ago.
关键在于：触发条件是发薪单位，而不是你的住址。如果你人在日本，但仍由英国雇主通过 PAYE 发薪，你依然适用英国本土门槛。如果你由日本雇主发薪，你就落入海外评估体系，适用日本门槛——哪怕你几周前才离开英国。
3. Why Overseas Thresholds Must Differ | 为什么海外门槛必须不同
If the SLC applied the UK threshold of roughly £31,000-£33,000 to every country, the consequences would be absurd in both directions. In Switzerland, Norway or Singapore, almost every graduate would repay, because local salaries are high relative to the UK. In Vietnam, Kenya or Bolivia, a well-paid graduate might earn the local equivalent of £12,000 a year and would repay nothing at all - even though that salary represents a comfortable middle-class life locally. The loan would effectively become a grant for low-income countries and a heavier burden for high-income ones.
如果 SLC 把英国大约 3.1 万至 3.3 万英镑的门槛套用到所有国家，两个方向的后果都很荒谬。在瑞士、挪威或新加坡，几乎所有毕业生都要还款，因为当地薪资相对英国很高。而在越南、肯尼亚或玻利维亚，一位收入不错的毕业生年薪可能只相当于 1.2 万英镑，于是完全不用还款——尽管这份薪水在当地已代表体面的中产生活。贷款实际上会变成对低收入国家的赠款，而对高收入国家则变成更重的负担。
Policy-makers therefore aim for horizontal equity: two borrowers at the same standard of living should repay the same real amount, wherever they live. The tool is purchasing power parity (PPP), the exchange rate that equalises the cost of a basket of goods across countries, rather than the market exchange rate.
因此政策制定者追求的是横向公平：生活水平相同的两位借款人，无论住在哪里，都应承担相同的实际还款额。所用工具是购买力平价（
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