Buttons
Use one primary action per screen. Labels state what the action does.
Aoline design system
Clear, reassuring digital tax services for people whose lives cross borders.
Independent service
Aoline is not part of HMRC or GOV.UK. This system adapts proven public-service interaction principles to Aoline’s own brand.
Design principles
1Start with the user’s situation
Leaving, abroad, returning or arriving—not internal tax categories.
2One clear decision at a time
Reduce uncertainty before asking for more information.
3Say what happens next
Every action describes its result in plain language.
4Trust through evidence
Show dates, sources, credentials and limits of advice.
Foundations
A restrained system: high contrast, a five-pixel spacing rhythm and typography optimised for instructions and decisions.
Colour
Deep navy
#0B1F33Primary text and headerSlate blue
#2F4A60Secondary text and supporting copyMuted gold
#C9A24DAccent rules, borders and value cuesWarm white
#F8F6F1Page and card backgroundSoft grey
#EEF1F4Quiet grouped contentVisited purple
#4C2C92Previously visited linksGold text
#6E5211Accessible accent textFocus yellow
#FFDD00Keyboard focus onlyError red
#B42318Errors and destructive warningsTypography
48 / 52International UK tax
36 / 40Check your tax position
24 / 30Before you move
19 / 28Clear body text for important financial information.
Spacing
15px210px315px420px525px630px740px850px960pxComponents
Square, obvious and predictable. Components should look interactive before a user has to investigate them.
Links and tags
Links use GOV.UK blue and stay underlined. Tags communicate status, never decoration.
Read the UK residence guidance or review an external source on GOV.UK .
CompleteIn reviewNot startedAction needed
Messages and warnings
Colour is supported by a label, icon or border—never used alone.
Important
Your move date can change the answer
Use the date you expect to leave the UK, even if it is not final.
You may need to report a UK property disposal within 60 days.
The Statutory Residence Test depends on your days, ties and circumstances for the whole tax year.
Forms
Ask only what is needed to make the next decision. Inputs use large targets, visible labels, helpful hints and explicit errors.
Text input
Labels sit above fields. Hints explain format, not the question itself.
For example, 15 10 2026
Question page
A working example showing radios, checkboxes, error recovery and confirmation.
Data display
Summaries make complex tax positions scannable and let users spot errors before they commit.
Summary list
Use on check-your-answers and assessment-result pages.
Comparison table
Headings describe the decision users are making.
| Service | Best for | Starting fee |
|---|---|---|
| Tax position review | Understanding exposure and next steps | £295 |
| Non-resident return | Annual UK reporting while abroad | £595 |
| Move plan | Advice before leaving or arriving | £750 |
Example service page
The system applied to Aoline’s primary lead product.
Check your UK tax position
Find the UK tax issues that may need attention before or after an international move.
Use this service to check:
- whether UK residence needs reviewing
- which UK income or gains may still be taxable
- whether a UK return or separate report may be required
- what to discuss with a Chartered Tax Adviser
You will need approximate travel dates and details of your UK connections.
This check gives general guidance. It is not a tax opinion or filing advice.
Source and ownership
Built for Aoline using principles documented by the GOV.UK Design System. Aoline owns its branding, tokens and React components. Government logos, the Crown and GDS Transport are deliberately excluded.