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Tax for employee with extra income — start here

For higher-earning employees the two highest-leverage moves are managing the £100k Personal Allowance taper via pension and avoiding HICBC clawback by adjusting Adjusted Net Income.

If you're a PAYE employee with additional income — dividends, savings interest, occasional eBay sales, a small consultancy on the side — your main employer's payroll handles the bulk of your tax, but you're responsible for telling HMRC about the rest. The most-used allowances are the £500 dividend allowance, the £1,000 / £500 Personal Savings Allowance (basic / higher rate), and the £1,000 trading allowance — but they're allowances, not bands: above them you owe at your marginal rate.

Key facts

Personal Savings Allowance: £1,000 of savings interest tax-free for basic-rate, £500 for higher-rate, £0 for additional-rate. (as of 2025-04-06)
Dividend allowance: £500 for all bands (down from £1,000 in 2023/24 and £2,000 before). (as of 2024-04-06)
Workplace pension auto-enrolment: 8% minimum total contribution (5% employee, 3% employer) on qualifying earnings £6,240–£50,270. (as of 2025-04-06)
HICBC: full Child Benefit clawback between £60k and £80k Adjusted Net Income (taper widened from £50k–£60k in April 2024). (as of 2024-04-06)
Tax-Free Childcare: government tops up by 20% (max £2,000/child/year, £4,000 if disabled); withdrawn at £100k Adjusted Net Income. (as of 2025-04-06)

Deadlines that matter for you

31 January 2027
Self Assessment online filing + balancing payment for 2025/26 (if registered).
If missed: £100 fixed + daily £10 after 3 months + 5% surcharges + interest.
5 October 2026
Register for Self Assessment if 2025/26 was your first year requiring it (e.g. dividends >£10k, untaxed income, HICBC liability).
If missed: Failure-to-notify penalty: 30%–100% of tax depending on behaviour.
Quarterly (every 3 months)
Re-confirm Tax-Free Childcare eligibility online (each parent earning <£100k + working at least equivalent of 16h/week minimum wage).
If missed: Loss of top-up for the next quarter if not reconfirmed; reapply afterwards.
Each pay reference period
Workplace pension contribution deducted via salary sacrifice or relief at source — check your tax code annually for benefits-in-kind adjustment.
If missed: Incorrect tax code → over- or under-payment of tax, reconciled in the P800 / Self Assessment.

What most people in your position get wrong

Assuming PAYE handles everything when dividend income is between £500 and £10,000.
Dividends between £500 (above the allowance) and £10,000 are reported via change-of-tax-code or a SA return if total untaxed income makes you a Self Assessment case. Above £10,000 dividends, Self Assessment is mandatory.
Typical cost: Failure-to-notify penalty + interest on unpaid dividend tax.
Not contributing extra to pension when Adjusted Net Income is between £100k and £125,140.
Personal Allowance tapers by £1 for every £2 above £100k, giving an effective marginal rate of 60% in that band (plus NI). Pension contributions reduce ANI £-for-£, often making each £1 contributed worth £1.60 in pre-tax value.
Typical cost: Effective tax saved: up to 60p per £1 of pension contribution in the £100k–£125k window.
Triggering HICBC by a bonus and not adjusting pension to compensate.
A bonus pushing ANI from £58k to £62k claws back ~10% of Child Benefit. Salary sacrifice or personal pension top-up brings ANI back down — same logic as the £100k taper.
Typical cost: Up to £2,212.60/year (2 children, 2024/25 rates) avoidable Child Benefit clawback.
Selling shares without using the £3,000 CGT annual exempt amount each year.
AEA crystallises annually — sell in two tax years to use two AEAs. Re-buying within 30 days (bed-and-breakfast) is blocked but transferring to a spouse or into ISA wrapper is not.
Typical cost: CGT saved: £3,000 × your CGT rate per year of unused AEA.

Who this is for

You're employed (PAYE) and also receive dividends, savings interest, small self-employed income, casual property income, or hold company benefits. Includes higher-earners worried about the £100k Personal Allowance taper or the £60k+ HICBC region.

Who this is NOT for

Pure full-time self-employment — see /start-here/sole-trader. Ltd company director-shareholders — see /start-here/ltd-director. Substantial rental portfolios — see /start-here/landlord.

Start with these guides

Personal Savings Allowance £1,000/£500 →

Banking interest tax-free thresholds by rate band.

Dividend Allowance £500 →

The shrunken allowance and what it means for casual shareholders.

Workplace pension (employer side) →

Auto-enrolment, sacrifice, employer matching.

EV salary sacrifice →

Low BIK + NI savings on company-provided EVs.

HICBC — Child Benefit clawback →

£60k–£80k taper mechanics + planning levers.

Tax-Free Childcare →

20% government top-up; £100k eligibility cliff.

Trading allowance — for occasional side income →

Your £1,000 buffer before any reporting kicks in.

Useful calculators

Income Tax calculator →

PAYE + extra income combined; shows Personal Allowance taper effect.

Pension relief calculator →

What a £X pension contribution actually costs you after tax.

ISA vs GIA →

Wrapper choice for savings + investments.

Dividend Tax calculator →

Tax on extra dividend income at your marginal rate.

Go deeper

In plain English

PAYE does the heavy lifting on your salary. Everything outside it — dividends above £500, interest above your PSA, side hustle above £1,000, casual property income — is your job to declare. The two biggest decisions for higher earners are how much to push through pension to manage the £100k taper or HICBC, and whether to use the dividend / savings / trading allowances strategically across the year.

Statute reference

Income Tax Act 2007 s.12B (Personal Savings Allowance); ITTOIA 2005 s.13A (dividend ordinary rate, with allowance in s.13(1) framework); Income Tax Act 2007 s.35 (£100k Personal Allowance taper); ITEPA 2003 Part 3 (employment income + benefits in kind); Pensions Act 2008 Part 1 (auto-enrolment); Income Tax (Earnings and Pensions) Act 2003 Chapter 6 (HICBC).

Worked example

Employee on £105,000 salary, £8,000 dividends, £2,500 savings interest, 2025/26 — sitting in the £100k Personal Allowance taper zone.

Salary: £105,000
Dividends: £8,000
Savings interest: £2,500
Adjusted Net Income: £115,500
Personal Allowance after taper: £12,570 − (£15,500 / 2) = £4,820

Calculation: Marginal rate on next £1 of salary: 40% IT + 0% PA loss already accounted = effective 60% in the £100k–£125,140 band on each £ until taper completes. Strategy: £15,500 pension contribution restores full Personal Allowance (£12,570). Net cost of £15,500 contribution: ~£6,200 (after 40% tax relief + restored PA savings).

Outcome: Without pension top-up: ~£40,800 total tax. With £15,500 pension top-up: ~£31,100 tax + £15,500 in pension. Roughly £24,000 worth of additional retirement saving for a net cash cost of ~£6,200. Plus dividend allowance £500 free, then £3,500 at 33.75% basic-rate-band-already-used; PSA £500 (higher-rate) + £2,000 at 40%.

Last reviewed: 2026-05-24. Statute references are for orientation, not advice. Always confirm specifics for your situation against current HMRC guidance or a regulated professional.