The Immigration Skills Charge (ISC) is a mandatory government levy that UK employers must pay when they assign a Certificate of Sponsorship to a worker on most sponsored work routes, including the Skilled Worker visa. It is calculated per worker, per six-month block of visa duration, and must be paid in full at the point of CoS assignment — before the worker ever applies for their visa. Budget for it early, because it cannot be recovered from the worker.

For Employers: What This Guide Covers

This guide is written for HR managers, business owners, and in-house immigration leads who already hold — or are applying for — a UK sponsor licence. It explains what the Immigration Skills Charge is, who pays it, how to calculate it correctly, which workers are exempt, and how to avoid the expensive mistakes that catch sponsors out. It does not constitute immigration legal advice. For decisions that turn on your specific circumstances, work with a licensed immigration solicitor or an OISC-regulated adviser.

What Is the Immigration Skills Charge and Why Does It Exist?

The Immigration Skills Charge was introduced in April 2017 under the Immigration Skills Charge Regulations 2017. It exists to make employers who rely on overseas workers contribute financially to domestic skills and training programmes. In policy terms, it is a price signal: sponsoring an overseas worker should carry a real cost, encouraging employers to invest in the UK resident labour market at the same time.

Practically, it is a statutory obligation with no discretion. If you assign a Certificate of Sponsorship for a qualifying route, the charge is applied automatically through the Sponsor Management System (SMS). You cannot defer it, negotiate it down, or offset it against other fees.

The ISC is distinct from three other costs employers often conflate with it:

  • The sponsor licence application fee — a one-time cost to obtain your licence (see the UK Sponsor Licence Cost and Fees Breakdown 2026 for a full breakdown).
  • The Certificate of Sponsorship fee — a smaller, per-CoS charge paid when you assign the certificate.
  • The visa application fee — paid by the worker directly to UKVI, not by the employer (though some employers choose to meet this cost voluntarily).

The ISC is the largest of these recurring per-worker costs and the one most frequently underestimated.

Which Visa Routes Attract the ISC?

Not all sponsored routes trigger the charge. As of 2026, the ISC applies primarily to:

  • Skilled Worker visa — the main route for most internationally recruited employees
  • Senior or Specialist Worker visa (formerly the Intra-Company Transfer route for senior/specialist staff)

It does not apply to several other routes, including the Global Business Mobility routes for some categories, the Graduate visa, the Seasonal Worker visa, and certain research-focused routes. The complete and authoritative list of exemptions is maintained on GOV.UK. Always check this before assigning a CoS, because the route classifications and exemption criteria have been updated multiple times since the points-based system was reformed in 2021.

How Is the ISC Calculated?

The Basic Formula

The ISC is charged in six-month blocks, rounded up to the nearest half-year. The rate per six-month block depends on your organisation's size.

Employer type Rate per 6-month block (indicative) Annual equivalent (indicative)
Medium or large employer £500 £1,000
Small employer or registered charity £182 £364

These figures are indicative based on the rates in force at time of writing. Verify the current rates on GOV.UK before budgeting, as they are subject to change by statutory instrument.

Determining Your Employer Size

Whether you qualify as a small employer is determined by the Companies Act 2006 definition, which looks at a combination of annual turnover, balance sheet total, and number of employees. You must satisfy at least two of the three criteria to qualify as small. Registered charities have their own category. If you are unsure, your accountant or legal adviser can confirm your size classification.

Getting this wrong in the wrong direction — claiming the small employer rate when you are medium or large — creates a compliance liability that UKVI can pursue.

The Rounding-Up Rule

This is where employers consistently lose money unnecessarily — not from overpaying, but from failing to understand the mechanism before they structure the offer.

The ISC rounds up to the nearest six months. This means:

  • A visa of exactly 12 months = 2 blocks = 2 × £500 = £1,000 (medium/large)
  • A visa of 13 months = 3 blocks = 3 × £500 = £1,500 (medium/large)
  • A visa of 18 months = 3 blocks = 3 × £500 = £1,500 (medium/large)

A worker sponsored for 13 months costs the same in ISC as one sponsored for 18 months. If your operational need is genuinely 13 months, you are paying for 18 months of ISC. There is no refund for the overage on unused partial blocks — only full six-month blocks paid but unused (due to early employment termination) are eligible for a partial refund.

Worked Illustrative Example: Calculating ISC for Three Hires

The following is illustrative only. Actual fees must be verified at GOV.UK.

Suppose a medium-sized UK employer sponsors three Skilled Workers in 2026:

Worker A — IT project manager, visa requested for 3 years (36 months) 36 months ÷ 6 = 6 blocks × £500 = £3,000 ISC

Worker B — Senior accountant, visa requested for 2 years 7 months (31 months) 31 months rounds up to 6 blocks (36 months ÷ 6) = 6 blocks × £500 = £3,000 ISC

Worker C — Care home manager, visa requested for 1 year (12 months) 12 months ÷ 6 = 2 blocks × £500 = £1,000 ISC

Total ISC for these three hires: £7,000, payable at the point of assigning each CoS — before any of the workers have submitted their visa applications.

If this same employer were a small employer or registered charity, the ISC would be: 6 + 6 + 2 = 14 blocks × £182 = £2,548.

The difference between size categories is substantial at scale. For organisations sponsoring dozens of workers annually, ISC can represent a six-figure annual cost centre.

Which Workers Are Exempt from the ISC?

The ISC exemptions are specific and defined in the regulations. Do not assume a worker is exempt without checking the current GOV.UK guidance. As of 2026, common exemption categories include:

  • Workers switching employer where they were previously sponsored and the new CoS does not extend the overall permission period (the "continuation" scenario — details are precise, get legal confirmation)
  • Workers sponsored under the International Sportsperson route
  • Workers on certain government-authorised exchange schemes
  • Certain PhD-level roles that meet specific criteria
  • Workers already in the UK on a visa that is not nearing expiry and meeting specific conditions

The exemption for high-earning Intra-Company Transfers has largely been subsumed into the restructured Global Business Mobility routes. If you are sponsoring intra-company transfers, the current ISC position for each sub-route should be verified individually.

If you believe a worker qualifies for an exemption, document your reasoning and keep the evidence. If UKVI later disagrees, you will be liable for the unpaid charge plus potential compliance action.

When and How Is the ISC Paid?

Payment is made through the Sponsor Management System (SMS) at the point of assigning the Certificate of Sponsorship. You cannot pay separately or in instalments — the full ISC for the visa period is required before the CoS is generated.

The CoS reference number is then included in the worker's visa application. UKVI will be able to see that the charge has been paid before processing the application.

This sequencing matters for your cash flow planning. If you are sponsoring multiple workers simultaneously — for example, hiring a cohort of care workers or filling several roles at once — the ISC, CoS fees, and any legal costs all land before those workers have started generating revenue for your business. Factor this into treasury planning, particularly for smaller organisations. The Small Business Guide to Sponsoring Overseas Staff UK 2026 covers cash flow planning for sponsorship in more depth.

Can You Claim a Refund?

Yes, in limited circumstances. If a sponsored worker's employment ends before the visa expires, you can apply to UKVI for a refund of ISC for any complete six-month blocks that were paid for but will not be used.

Important caveats:

  • The refund covers only full blocks, not partial periods.
  • You must notify UKVI of the change in circumstances via the SMS — this is a compliance duty regardless of the refund question.
  • Refund processing times vary; do not rely on a refund materialising quickly.
  • You must have ceased sponsorship correctly and on time to be eligible — late reporting can undermine a refund claim and create separate compliance issues. See Sponsor Licence Compliance Duties After Approval 2026 for reporting obligations.

The ISC in the Context of Total Sponsorship Cost

It is worth placing the ISC in the full cost picture. When you sponsor a worker, the total employer-side cost typically includes:

  1. Sponsor licence fee (one-off, unless you are renewing or upgrading)
  2. Certificate of Sponsorship fee per worker (currently a modest per-CoS charge — verify at GOV.UK)
  3. Immigration Skills Charge — the largest per-worker, per-assignment cost
  4. Immigration Health Surcharge — paid by the worker, but many ethical employers choose to meet this cost
  5. Legal or advisory fees if you use a solicitor or OISC adviser to manage the process

For a medium or large employer sponsoring a Skilled Worker on a standard three-year visa, items 2 and 3 alone can amount to over £3,000 per worker before any advisory fees. Multiply that across a team and the annual immigration budget becomes significant. For employers in sectors with high international recruitment — such as those hiring for accountant roles with visa sponsorship or in care and health — these costs need to be embedded in workforce planning from the outset.

Common Mistakes Employers Make with the ISC

1. Failing to budget for it before extending an offer

The ISC must be paid before the CoS is assigned. Employers who have not budgeted for it discover the problem only when they log into the SMS to assign the certificate. Fix: include ISC in your cost-per-hire calculation the moment you decide to recruit internationally.

2. Using the wrong employer size band

Some employers incorrectly claim the small employer rate when they do not meet the Companies Act criteria, or vice versa. Fix: confirm your size classification with your accountant before assigning any CoS, and document the basis for your classification.

3. Ignoring the rounding-up rule when structuring visa length

Requesting a 25-month visa costs the same in ISC as a 30-month visa. Many employers set visa lengths based on the worker's preference or a round number without considering the ISC block structure. Fix: align the visa period to the nearest favourable six-month boundary where operationally appropriate.

4. Trying to recover the ISC from the worker

Some employers — particularly those unfamiliar with the rules — attempt to deduct the ISC from wages or include it in a "training cost recovery" clause in the employment contract. This is a breach of sponsor licence conditions and, where it results in pay falling below the minimum threshold for the role, a separate compliance failure. Fix: treat the ISC as an employer operating cost. Do not attempt recovery of any kind from the worker.

5. Assuming exemption without checking

Exemptions are narrowly defined. An employer who assumes a worker qualifies for an exemption and does not pay — then finds the assumption was wrong — faces a compliance investigation. Fix: if exemption is arguable, get a written view from a licensed immigration solicitor before proceeding.

6. Failing to reclaim refunds when workers leave early

Some sponsors do not realise a refund is available or fail to apply within the appropriate window. Fix: establish a process for tracking sponsored workers' employment status and triggering a refund application promptly when employment ends early.

7. Conflating ISC with the Immigration Health Surcharge

These are two separate charges with different payment mechanisms and different payers. The IHS is paid by the worker (or borne by the employer voluntarily); the ISC is paid by the employer with no worker involvement. Fix: ensure your HR team understands the distinction so neither charge is overlooked.

Practical Advice for HR Teams Setting Up ISC Processes

If your organisation sponsors workers regularly, build the ISC into standing procedures rather than treating it as a one-off calculation each time.

Checklist for each new CoS assignment:

  • Confirm the route attracts the ISC (check GOV.UK exemption list)
  • Confirm employer size classification is current and documented
  • Calculate the correct number of six-month blocks for the requested visa period
  • Verify the current per-block rate at GOV.UK
  • Ensure the ISC budget is approved and funds are available in the SMS account
  • Record the CoS reference number and ISC amount paid for your HR file
  • Set a calendar reminder at the end of the worker's expected employment period to assess whether a refund claim is appropriate

If you are using a corporate immigration service to manage CoS assignments, confirm that your provider is verifying the rate at GOV.UK at time of assignment rather than relying on cached figures. For a broader view of what third-party immigration support covers and costs, see Corporate Immigration Services: What They Do and Cost 2026.

Where the ISC Fits in the Wider Sponsorship Journey

The ISC is one step in the CoS assignment process, which is itself one step in the full sponsorship journey. If you are new to sponsorship, the sequence runs roughly as follows: obtain a sponsor licence, access the SMS, create and assign a CoS (paying the CoS fee and ISC at this stage), provide the CoS reference number to the worker, then the worker applies for their visa. A full walkthrough of the end-to-end process is available in How to Sponsor an Employee for a Work Visa: Step by Step, and the specifics of what a Certificate of Sponsorship is and how it works are covered in Certificate of Sponsorship Explained for Employers 2026.

Understanding the ISC properly is inseparable from understanding the full cost and compliance architecture of being a sponsor. Employers who treat it as an afterthought tend to find it disrupting hiring timelines and budgets at the worst possible moment.

A Note on Ethical Recruitment

No legitimate employer charges a worker for the Immigration Skills Charge, the visa application fee, the Immigration Health Surcharge, or any other cost associated with obtaining sponsorship. The ISC is an employer's statutory obligation. Workers should never be asked to pay it, reimburse it, or effectively fund it through reduced wages. If you encounter a recruitment agency or adviser suggesting that costs can be passed to the worker, treat that as a serious red flag and take independent legal advice before proceeding.

Verify Everything at GOV.UK

The ISC rates and exemption criteria are set by statutory instrument and have been revised multiple times since the charge was introduced. The figures in this guide reflect the position at time of writing in 2026 and are presented as illustrative to help you understand the structure of the charge. Before assigning any Certificate of Sponsorship, verify the current rate, your size band criteria, and the current exemption list on the official GOV.UK Immigration Skills Charge guidance page. Where your situation involves any complexity — multiple employees, uncertain exemption status, or a change of sponsor scenario — take advice from a licensed immigration solicitor or OISC-regulated adviser.