GBP 5,000 bonus with Plan 2 versus no student loan

Scenario

A £5,000 bonus is added to two different base salaries: £35,000 and £45,000. For each, the result is compared with no student loan versus Plan 2 selected. The goal is to show how Plan 2 raises the effective marginal rate on a bonus and reduces its spendable value.

Bonus on a £35,000 salary

At £35,000 the employee is a basic-rate taxpayer. The £5,000 bonus falls entirely within the basic-rate band.

Deductions on the £5,000 bonus — no student loan:

| Deduction | Rate | Amount | |---|---|---| | Income tax | 20% | £1,000 | | Employee NI | 8% | £400 | | Student loan | None | £0 | | Net bonus received | | £3,600 |

Deductions on the £5,000 bonus — Plan 2:

| Deduction | Rate | Amount | |---|---|---| | Income tax | 20% | £1,000 | | Employee NI | 8% | £400 | | Plan 2 repayment | 9% | £450 | | Net bonus received | | £3,150 |

Plan 2 reduces the spendable bonus by £450 — from £3,600 to £3,150. The effective marginal rate on the bonus rises from 28% (tax + NI) to 37% (tax + NI + Plan 2).

Bonus on a £45,000 salary

At £45,000 the employee is also a basic-rate taxpayer. Adding a £5,000 bonus brings total income to £50,000, which is still below the £50,270 higher-rate threshold. The entire bonus remains in the basic-rate band.

Deductions on the £5,000 bonus — no student loan:

| Deduction | Rate | Amount | |---|---|---| | Income tax | 20% | £1,000 | | Employee NI | 8% | £400 | | Student loan | None | £0 | | Net bonus received | | £3,600 |

Deductions on the £5,000 bonus — Plan 2:

| Deduction | Rate | Amount | |---|---|---| | Income tax | 20% | £1,000 | | Employee NI | 8% | £400 | | Plan 2 repayment | 9% | £450 | | Net bonus received | | £3,150 |

The result is the same as at £35,000 because both salaries sit within the basic-rate band and above the Plan 2 threshold. The deduction stack is identical.

What if the bonus pushes into the higher-rate band?

At £46,000 base salary, a £5,000 bonus brings total income to £51,000 — £730 above the £50,270 higher-rate threshold. The deductions split across two rates.

Without Plan 2: - £4,270 (below the threshold) x 28% = £1,196 - £730 (above the threshold) x 42% (40% tax + 2% NI) = £307 - Total deductions: £1,503. Net bonus: £3,497.

With Plan 2: - Add 9% Plan 2 on the full £5,000: £450 - Total deductions: £1,953. Net bonus: £3,047.

Once the higher-rate band is reached, the effective marginal rate on the top slice is 42% without Plan 2 and 51% with Plan 2.

Summary: the Plan 2 effect on a £5,000 bonus

| Base salary | Without Plan 2 | With Plan 2 | Reduction | |---|---|---|---| | £35,000 | £3,600 | £3,150 | £450 | | £45,000 | £3,600 | £3,150 | £450 | | £46,000 (crosses HRT) | £3,497 | £3,047 | £450 |

The Plan 2 reduction is consistently £450 on a £5,000 bonus wherever the salary sits within the basic-rate band and above the Plan 2 threshold. This is simply 9% x £5,000.

Key message

Plan 2 raises the effective marginal rate on a bonus by exactly 9 percentage points. A basic-rate taxpayer moves from a 28% marginal rate (20% tax + 8% NI) to a 37% marginal rate on every pound of bonus above the repayment threshold. This is not a special penalty on bonuses — it is the same 9% that applies to any additional earnings above £27,295. Bonuses simply make it very visible because the lump sum lands in a single payslip.

Use the bonus tax calculator for your own salary and plan, then read Student loans and take-home pay, explained properly or Bonus tax explained UK for further context.