UK residents with US RSUs: complete tax + filing guide for 2026

You're a software engineer at Google London, Meta Bishopsgate, or a US bank's UK desk. Your RSUs vest. Your US broker shows USD numbers. Your UK employer withheld PAYE somewhere. Then HMRC wants you to report it correctly on Self Assessment. This guide is the complete UK framework for US RSU tax.

The 30-second answer: UK residents pay UK income tax + NIC on US RSU vest via PAYE (20%/40%/45% income tax + 8%/2% NIC). Cost basis for CGT = FMV at vest in GBP. Subsequent sale taxed at UK CGT (18% basic / 24% higher rate post-30 October 2024) on gain net of £3,000 annual exempt amount. US dividend WHT: 15% with W-8BEN under Article 10 of US-UK DTC. Report on SA106 (foreign income), SA108 (capital gains). ISA-held US stocks are UK-tax-free but US dividend WHT remains non-creditable.

Filing for the 2025-26 UK tax year? This piece covers the complete UK tax + reporting framework. UK tax year runs 6 April to 5 April. Self Assessment deadline: 31 January 2027 for online filing (for 2025-26 tax year).

The UK tax year + filing timeline

Before the mechanics, the calendar:

• UK tax year: 6 April to 5 April (different from calendar year and from US fiscal year)
• Self Assessment deadline: 31 January following the tax year end (online); 31 October (paper)
• Payment deadline: 31 January with the return + 31 July (payments on account if liability >£1,000)
• Late filing penalty: £100 minimum, escalating

For RSU income in the 2025-26 UK tax year (6 April 2025 - 5 April 2026), Self Assessment return is due 31 January 2027 online.

The vest event — UK mechanics

When your RSUs vest in the UK:

1. Vest value = FMV × shares at vest date in USD
2. Convert to GBP at the HMRC-accepted rate (spot or monthly average on vest date)
3. UK employer treats this as employment income under section 471 ITEPA 2003 (Income Tax (Earnings and Pensions) Act 2003)
4. PAYE withholding applies at your marginal rate via your payroll
5. National Insurance Contributions (NIC) apply:
   • Employee primary Class 1: 8% on earnings between £12,570 and £50,270
   • 2% above £50,270
6. Employer NIC of 13.8% applies (paid by employer; not your direct cost but affects total comp)
7. Cost basis for future CGT = FMV at vest in GBP
8. Vest income appears on your P60 at year-end

Critical insight: PAYE withholding usually approximates your liability but doesn't perfectly. For employees with large RSU vests + high salary, you may need to pay additional tax at Self Assessment (or be due a small refund). Plan cash flow accordingly.

The UK income tax bands (2024-25 rates)

For RSU vest income added to your salary:

Band	Income range	Income tax rate
Personal allowance	£0 - £12,570	0%
Basic rate	£12,571 - £50,270	20%
Higher rate	£50,271 - £125,140	40%
Additional rate	Over £125,140	45%

Personal allowance taper: if your adjusted net income exceeds £100,000, your personal allowance reduces by £1 for every £2 of income above £100,000. Full taper at £125,140. This creates an effective 60% marginal rate band between £100K-£125K.

Implication for RSU holders: a vest that pushes you across £100K creates the 60% effective band on the affected income. Time vests + understand the marginal impact.

National Insurance Contributions (NIC) on RSU vest

NIC applies to RSU vest income (treated as earnings):

Earnings	Employee NIC rate (Class 1 primary)
£0 - £12,570	0%
£12,571 - £50,270	8%
Over £50,270	2%

For RSU vests pushing earnings above £50,270, the marginal NIC drops to 2% (regressive). For lower earners, the marginal NIC is 8%.

Combined effective rate for higher-rate RSU holder (income above £50,270 but below £100K):

• 40% income tax + 2% NIC = 42% effective marginal rate

For additional rate (>£125,140):

• 45% income tax + 2% NIC = 47% effective marginal rate

For the £100K-£125,140 taper band:

• 40% × 2 (taper effect) + 2% = ~62% effective

Capital Gains Tax (CGT) on US stock sales

When you sell US shares (post-vest holdings or LRS-acquired):

Post-30 October 2024 CGT rates (2024-25):

• 18% for basic-rate taxpayers (income below £50,270)
• 24% for higher/additional-rate taxpayers (income above £50,270)

Annual exempt amount: £3,000 (2024-25) — gains below this threshold not taxable.

Computation:

• Sale proceeds in GBP (sale price USD × GBP/USD on sale date)
• Less cost basis in GBP (FMV at vest USD × GBP/USD on vest date)
• Less allowable expenses (brokerage, FX costs)
• = Net chargeable gain

If net gains for the tax year exceed £3,000, the excess is taxable at 18% / 24%.

Currency leg surprise: GBP has been relatively weak against USD in recent years (GBP/USD ~1.27 in 2024-25 vs ~1.40 historical). When you bought USD assets, GBP was stronger; when you sell, GBP weaker means more GBP proceeds. Currency depreciation amplifies your reported GBP gain even when USD return is modest.

US dividend withholding for UK residents

US source dividend payments to UK residents:

Without W-8BEN: 30% US WHT (default for non-resident aliens).

With W-8BEN claiming UK residency under US-UK DTC Article 10: 15% US WHT.

Filing W-8BEN: simple online form with your US broker. Valid 3 years; renew before expiry. The 15-percentage-point saving compounds materially over a career.

UK side:

• Gross dividend (USD × GBP/USD on payment date) reported on SA106 foreign pages
• UK income tax applies at dividend rates: 8.75% (basic), 33.75% (higher), 39.35% (additional)
• US WHT (15%) creditable against UK liability via foreign tax credit
• Net result: effective rate = max(UK rate, 15%) — for additional-rate taxpayers, full UK rate applies; for basic-rate, US WHT 15% covers UK liability fully (since UK rate is 8.75%)

Dividend allowance: £500 (2024-25). Gross dividend income up to this threshold is tax-free in UK; above is taxable. The allowance is reducing year-on-year.

Self Assessment reporting — SA106 and SA108

For UK residents with US RSUs:

SA106 — Foreign income

Used for:

• US dividend income (gross, with US WHT detail)
• Foreign tax credit claim
• Country breakdown
• Required if foreign income > £300 (or other situations)

SA108 — Capital gains summary

Used for:

• Capital gains on US share sales
• Required if total gains > annual exempt amount OR total proceeds > 4× the annual exempt amount
• For 2024-25: report if gains > £3,000 OR proceeds > £12,000

Computational records to maintain

• Vest event details: date, shares, USD value, GBP/USD rate, GBP value
• Sale event details: date, shares, USD value, GBP/USD rate, GBP value
• Dividend payment details: date, USD amount, USD WHT, GBP equivalent
• Brokerage and FX cost documentation

ISA wrapper — the UK tax shelter for US stocks

UK residents can hold US stocks within a Stocks & Shares ISA. Key implications:

Within ISA wrapper:

• All UK capital gains: tax-exempt
• All UK income tax on dividends: exempt
• All ISA holdings: outside Self Assessment reporting for income/CGT

Limitations:

• Annual contribution limit: £20,000 (2024-25, all ISA types combined)
• Must be funded from UK-source money (you can't transfer existing US RSU shares into ISA directly)
• US still withholds 15% on dividends via W-8BEN (treaty rate); this WHT is NOT creditable for ISA-held holdings (no UK tax to offset)

Strategic implication: for UK residents wanting to hold US ETFs (VTI, VOO, S&P 500 trackers) for the long term, ISA is the right wrapper. RSU shares received directly from US employer cannot be placed in ISA; only newly purchased US shares from your ISA cash.

ISA-eligible US stocks: Most US individual stocks (AAPL, MSFT, GOOG, etc.) ARE ISA-eligible. Some leveraged ETFs and complex instruments are not.

Best brokers for UK residents holding US stocks

Broker	Strength	Weakness
Interactive Brokers UK	Lowest costs; sophisticated platform; broadest US stock access	Higher complexity; not consumer-friendly
Trading 212	Free trading; ISA-compatible; clean app	Limited research; some FX spread
Hargreaves Lansdown	UK-premium brand; strong ISA platform; research depth	Higher costs; £11.95 per US trade
AJ Bell	Established ISA platform; lower than HL	Limited modern UX
eToro	Multi-asset; social investing	Higher spreads; FCA-regulated UK entity available
Saxo Bank UK	Sophisticated platform; ETF-focused	Higher minimums
Freetrade	Free ISA trades; mobile-first	Limited US stock universe

For RSU holders specifically: Most UK FAANG employees access US stock via the US employer broker (Schwab, Morgan Stanley, Fidelity, E*Trade). After vest, options:

1. Hold in US employer broker — works but adds account complexity
2. Transfer (ACAT-equivalent) to Interactive Brokers UK — preserves cost basis
3. Sell in employer broker and re-buy in UK ISA — taxable event but cleaner long-term

For most UK FAANG engineers, selling at vest and reinvesting in UK ISA (or Sipp for retirement) is the disciplined diversification path. Tax is paid once via PAYE on vest; subsequent ISA-held investments are tax-free.

SIPP (Self-Invested Personal Pension) — the retirement wrapper

For long-term US stock exposure within the UK pension framework:

• Annual contribution limit (after tax relief): £60,000 (2024-25) or 100% of relevant UK earnings
• Tax relief at marginal rate (40%/45% for higher earners — big benefit)
• Investments grow tax-free within SIPP
• Withdrawals taxed as pension income at then-current rates
• 25% tax-free lump sum at retirement age (subject to limits)

Holding US stocks in SIPP: very tax-efficient. The 15% US dividend WHT on SIPP-held shares is NOT creditable (no UK tax to offset within SIPP), but the broader pension tax advantages dominate.

Cross-border vesting — moved to/from US

Many UK RSU holders worked in the US for part of the vesting period:

If RSU vest covers period when you worked in both US and UK:

• Workday attribution applies under US-UK DTC Article 14
• Portion of vest attributable to US workdays is US-source income (taxable in US)
• Portion attributable to UK workdays is UK-source income
• Both UK and US may tax their respective portions; double taxation avoided via foreign tax credit on both sides

Example: 4-year vest grant; you worked 1 year in NYC, 3 years in London. A vest in Year 4: 25% US-source (NYC year), 75% UK-source. NYC employer would withhold on the US-source portion; UK PAYE on UK-source.

Practical implication: maintain workday records during cross-border employment. Get expert advice for material cross-border vests.

Foreign Tax Credit mechanics for UK residents

UK gives credit for foreign tax paid on the same income via the unilateral credit relief (Section 18 TIOPA 2010) or treaty-based credit:

On US dividends:

• US WHT (15% via W-8BEN) creditable against UK tax on same dividend
• For higher-rate taxpayers, UK tax 33.75% on dividend — US WHT 15% — additional UK tax due: ~18.75%
• For basic-rate taxpayers, UK tax 8.75% — US WHT 15% — no additional UK tax (excess US WHT can be carried forward in some circumstances)

On US RSU vest income:

• If treated as US-source income under DTC (cross-border situations), US tax is creditable against UK liability
• For purely UK-source vest income (UK resident, UK workdays), no US tax involved — no FTC needed

Common UK RSU mistakes

1. Missing the SA108 capital gains reporting threshold. If proceeds > £12,000 OR gains > £3,000, you must report even if no tax due.

2. Wrong GBP/USD rate. Using bank credit date instead of trade date. Document the rate methodology consistently.

3. Not claiming foreign tax credit on US dividends. UK residents who don't file SA106 lose the 15% US WHT credit — paying tax twice on dividends.

4. Misunderstanding ISA limits. Trying to put employer RSU shares directly into ISA (not allowed).

5. Personal allowance taper surprise. Vest that pushes income across £100K creates 60% effective marginal band.

6. NIC underwithholding for high earners. PAYE generally handles this, but verify on P60.

7. Missing the 31 January Self Assessment deadline. £100 minimum penalty escalates rapidly.

8. Holding too much employer stock. Concentration risk doesn't reduce just because you're in UK.

The 2026 strategic playbook

For UK residents with US RSUs:

1. Vest-and-sell as default: convert vest to GBP, redirect into ISA or SIPP
2. Annual rebalance: maintain employer-stock <15% of net worth
3. Maximize ISA contributions: £20K/year tax-free wrapper for ongoing US ETF investment
4. Use SIPP for retirement-tagged investments: tax relief on contribution + tax-free growth
5. W-8BEN on file: 15% US WHT instead of 30%
6. Track CGT annual exempt amount: harvest small gains tax-free each year
7. Plan around personal allowance taper: time vests if income is near £100K threshold
8. Maintain documentation: vest dates, FX rates, broker statements — needed for SA108

The closing read

UK residents with US RSUs face a meaningfully different tax framework than US-resident RSU holders. Three principles:

1. PAYE handles vest, but you may owe additional tax at SA filing for high earners — plan cash flow
2. CGT on sale at 18%/24% post-30 October 2024, with the currency leg amplifying GBP gains during GBP weakness
3. ISA + SIPP wrappers are the UK-specific tax shelters for ongoing US stock investment

The mechanical execution is straightforward once you understand the framework. The strategic decisions — sell at vest vs hold, ISA allocation, SIPP contribution timing, personal allowance management — compound across a career into hundreds of thousands of pounds.

Cross-references

• How RSU double-taxation works — concept overlap
• Reading your Morgan Stanley StockPlan Connect statement — most UK FAANG holders are on MS
• DTAA US-India complete guide — DTAA mechanics primer (UK-US similar structure)
• The rupee-dollar lens for US stock returns — FX dynamics analogue for GBP-USD

Critical disclaimer: this article reflects UK tax law as of June 2026. Tax rates, bands, and allowances change with each Finance Act. Specific facts of your situation, residency status (UK resident, non-domiciled, or dual-resident), and individual circumstances determine actual treatment. This article does not substitute for personalized advice from a UK chartered accountant or tax adviser. Cross-border situations (US/UK dual residency, statutory residence test edge cases) require specialist advice.