Business Structures
Compare sole trader, partnership and limited company tax responsibilities before choosing a route.
Business Structures explained
Sole trader, partnership and limited company are legal/tax structures with different registration, accounting, tax, National Insurance and filing consequences. The best structure cannot be chosen from a tax rate alone.
This learning path covers UK rules and ReturnDeck’s UK form set. Check the effective period and official source before using a rule for a live filing.
Learn it in stages
Beginner · Sole trader
A sole trader runs the business personally. Business profit normally feeds into the owner’s Income Tax/Self Assessment position, with relevant National Insurance rules. Record keeping must clearly support business income, expenses and private adjustments.
Beginner · Partnership
A partnership calculates business profit and allocates it between partners under the relevant rules. The partnership and individual partners have connected filing responsibilities; the partnership is not simply two sole-trader returns added together.
Intermediate · Limited company
A company is a separate legal person. It has company accounts and Corporation Tax obligations; extracting value through salary, dividends, benefits or other transactions can create separate company and individual consequences.
Advanced · Choosing and changing structure
Compare liability, administration, financing, profit extraction, employment, VAT, losses, pensions, succession and commercial needs. Incorporation or moving assets/contracts can itself have tax and legal consequences, so model the whole position rather than one headline rate.
Example: compare the obligations, not just tax
A consultant expects £90,000 annual profit and needs to decide between sole trader and limited company. Build two obligation maps: registrations, bookkeeping, tax returns, payroll if salary is used, dividend documentation, Companies House duties, pension/benefit considerations and cash extraction. Only then compare estimated tax and administrative cost.
Apply this in Practice Mode →Common mistakes to avoid
- Choosing a company solely because a Corporation Tax rate looks lower
- Treating company money as the director’s personal money
- Ignoring partnership return responsibilities
- Forgetting Companies House obligations when comparing structures
- Assuming incorporation is tax-neutral for existing assets and contracts
Records and preparation checklist
Before calculating or filing, assemble the evidence that supports the position. This makes the return easier to complete and easier to explain later.
- Owners and liability exposure
- Expected profit and cash-drawing needs
- Employees/payroll and pension plans
- VAT and sector obligations
- Accounts/returns/Companies House administration
- Future investment, sale or succession plans
Key terms
An individual carrying on a business personally.
A business relationship in which partners carry on business together and share profits under the partnership arrangements.
A separate incorporated legal person with its own company and tax obligations.
Ways owners/directors receive value from a company, such as salary or dividends, each with its own rules.
Follow the lesson into the form
ReturnDeck’s 1,139 mapped UK fields connect form codes to plain-English meaning, applicability, source figures, calculation notes, examples, common mistakes, interactions and HMRC sources.
Calculate and check
Use the related ReturnDeck calculator or checker to turn the lesson into a practical result where the verified rules support deterministic calculation.
Open related tool →Practice what you learned
Move from learning into a fictional case file, source documents, return completion, validation and a worked answer. Practice Mode never submits anything to HMRC.
Continue to practice →Official HMRC / GOV.UK sources
These are the primary official sources for this learning path. ReturnDeck summarises them for learning; the official material remains the authority.
Source set reviewed for ReturnDeck’s 2026 UK learning layer. Tax rules change; verify the effective date for a live decision.