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UK employment law does not fix a single legal definition of full-time hours — most employers treat 35 to 40 hours a week as full-time by convention — but sponsor licence rules do set a specific figure: the Skilled Worker route uses 30 hours a week as the baseline for calculating going rates, with anything below treated as part-time and salary pro-rated accordingly.
Contractual full-time vs the Working Time Regulations cap
Separately from any full-time convention, the Working Time Regulations 1998 cap average working time at 48 hours a week unless the individual has signed a valid opt-out. This applies regardless of immigration status and sits alongside, not instead of, sponsor duties — a sponsored worker's contracted hours and their actual worked hours both need to stay consistent with what was declared on their Certificate of Sponsorship.
How the pro-rata calculation actually works
The mechanism is proportional, not a flat deduction: a role contracted for fewer than 30 hours a week has its going rate and salary floor figures scaled down in line with the ratio of contracted hours to the 30-hour baseline, and the result is then compared against the worker's actual annualised salary. Sponsors sometimes make the mistake of pro-rating in the wrong direction — scaling the worker's offered salary up to a notional full-time equivalent instead of scaling the threshold itself down to match the actual contracted hours — which can produce a passing figure on paper that would not survive the correct calculation. Because this arithmetic sits underneath every Certificate of Sponsorship assigned for a part-time role, it is worth checking against the current worked example on GOV.UK rather than recalculating from memory each time a new part-time hire is assessed.
Why the sponsorship definition of full-time matters more than the contractual one
When assessing a Skilled Worker application, the Home Office compares the salary offered against the going rate for the specific occupation code, calculated on a 30-hour week. A role advertised or contracted at fewer hours does not fail automatically, but the salary threshold — including the wider general salary floor — is pro-rated down proportionally, with a floor below which the route is not available at all, so sponsors offering genuinely part-time roles need to check both the occupation-specific going rate and the general threshold before assigning a Certificate of Sponsorship.
‘Full-time’ means something different on other visa routes
The 30-hour Skilled Worker baseline is specific to that route and should not be assumed to carry across to any other sponsorship an employer is also managing. A Student visa holder's permitted working hours during term time are capped at a much lower weekly figure, and that cap is about immigration conditions on the individual rather than a sponsor's salary assessment. A Health and Care Worker visa follows broadly the same general salary architecture as Skilled Worker but sits within its own occupation and going rate framework, with its own current figures to check. Employers who sponsor across more than one route — a hospital group with Skilled Worker clinicians and Student visa placement staff, for example — should treat ‘full-time’ as a route-specific term each time it comes up, rather than one fixed number that applies across the whole organisation.
What sponsors must report if hours change
A significant change to a sponsored worker's hours — a permanent move from full-time to part-time, or a reduction that also cuts pay below the assessed threshold — is a reportable change of circumstances under the Home Office's sponsor duties, not a matter to handle quietly through payroll alone; see Part 3: sponsor duties and compliance. This applies equally under the Temporary Worker sponsor licence, where engagements are often short and hours can vary week to week.
Not every dip in hours needs handling the same way. A short, clearly temporary reduction — a quiet trading period in hospitality or retail, for instance — is different from a permanent renegotiation of a worker's contract, and sponsor guidance is concerned mainly with changes that are significant and lasting. That said, ‘temporary’ is doing a lot of work in that sentence: a reduction that drifts on for months without ever being formally reversed is difficult to defend as temporary if it comes up in a later compliance visit, so it is worth documenting the reason and the expected end date for any short-term hours reduction at the time it happens, rather than trying to reconstruct the justification afterwards.
FAQs
Can a Skilled Worker be sponsored for genuinely part-time hours? Yes, generally down to a minimum of around 20 hours a week, provided the pro-rated salary still clears the relevant threshold — always confirm the current figure on GOV.UK rather than a fixed number quoted elsewhere.
Does unpaid overtime count toward the 30-hour full-time calculation? No — only contracted, paid hours count for going rate and salary threshold purposes; unpaid extra hours do not increase the effective hourly rate used in the assessment.
Does paid annual leave count toward the 30-hour calculation? Yes — a worker on paid annual leave is still being paid their contracted hours, so scheduled leave does not affect the hours or salary calculation; an unpaid absence or sabbatical is a different matter and may need to be reported separately.
Can a sponsored worker take a second job to make up hours or income? Only within whatever supplementary employment conditions are attached to their specific visa, which generally restrict additional work to the same profession or occupation code and a limited number of hours alongside the sponsored role — check the current conditions on GOV.UK before assuming a second job is permitted.
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