Updated September 2026
Contractors are how a business gets expertise for exactly as long as it needs it: a project, a peak, a gap, a skill nobody in-house has. Hired well, they're the most flexible resource you have. Hired badly, they're an HMRC letter, a supplier dispute or a key person walking out with the only copy of the model. The difference is process, and most businesses don't have one; they have whatever the last hiring manager did. This is the process. It's general commentary rather than legal advice, and the notes at the end say where to get the real thing.
1. Decide whether it's a contractor role at all
Start with the work, not the label. A contractor suits a defined outcome with a start and an end: a migration, a model rebuild, a regulatory deadline, cover for a known absence. If the work is ongoing, undefined and will still be there in two years, you're describing a job, and hiring a contractor for it creates both the cost and the compliance risk at once. If you're weighing the two for a specific role, why your business might need contract staff sets out the trade-offs.
2. Choose the engagement route
There are four, and the choice shapes everything after it. Direct with the contractor's own limited company, which gives most control and puts the status decision squarely on you. Through an umbrella company, where the contractor is the umbrella's employee and PAYE is handled there; note that from April 2026 agencies, and end clients where there's no agency, carry joint liability for PAYE an umbrella fails to pay, so who you use matters. Through an agency on a PAYE or temp basis, simplest for volume and cover. Or under a statement of work with a supplier, where you buy an outcome rather than a person's time. If you're running more than a handful of contractors, a managed service provider runs all four routes under one process and one set of reporting.
3. Determine IR35 status before you advertise
If you're a medium or large business, the status decision is yours, and it needs to be made before the role goes out, not when the first invoice arrives. Decide it on the working reality: who controls the work, whether a substitute would actually be accepted, whether there's an obligation to keep offering and accepting work, who carries the financial risk. Write the determination and the reasons down, give it to the contractor and the agency, and state the status in the advert so nobody is surprised at offer stage. How IR35 changes the way you hire contractors covers the rules; the signs you're at risk is the check to run on the engagements you already have.
4. Write a brief, not a job description
Contractors are bought for outcomes, so the brief should read like one: what will exist at the end that doesn't exist now, by when, with what constraints, working with whom. Include the duration, the start date, the day-rate range, the status determination and whether the work is on site, hybrid or remote. Leave out the culture paragraph, the values and the "opportunity to grow"; a contractor reads those as a sign you haven't decided what you want.
5. Set the rate properly
A day rate isn't a salary divided by 220. Contractors carry their own holiday, sick pay, pension, insurance, equipment and gaps between engagements, which is why the rate looks high and why the comparison that matters is total cost against a permanent hire for the same period, including agency fees and the cost of the seat staying empty. Inside-IR35 rates and outside-IR35 rates for the same work are different numbers, because the take-home is different; if you switch a role's status, expect the rate conversation to follow. If you've no benchmark for a specialist rate, that's part of what our talent advisory work is for.
6. Source from the right place
Good contractors are rarely found through a job board; they're found through the people who placed them last time. For a specialist role, one agency that knows the market beats five that don't, because five agencies on one role means five sets of the same CVs, five fee negotiations and a candidate who has been approached five times and drawn a conclusion about you. If your contractor population already spans several suppliers, see the top recruitment MSP providers in the UK, and if nobody owns the full picture of contractor spend and compliance, read whether you need a recruitment MSP.
7. Assess quickly and decisively
Contractors decide in days, not weeks; a good one has two other conversations running. One structured interview against the brief, a look at previous work where the role allows it, and references from the last two engagements is enough. A decision within 48 hours of the last conversation is what keeps the one you want.
8. Onboard compliantly
Before day one, not after: right-to-work checks, references, and pre-employment screening proportionate to the role (a contractor with access to customer data or money needs more than one building a dashboard). A contract whose terms match the status determination, because a substitution clause the business would never honour is worse than none. Clear terms on notice, intellectual property, confidentiality and expenses. And systems access set up in advance, because a day rate spent waiting for a laptop is the most expensive kind.
9. Manage the engagement, not just the timesheet
Approve time promptly, review progress against the brief, and treat every extension as a decision rather than a formality: does the work still match the determination, has the role quietly become a job, is the rate still right? Contractor engagements go wrong slowly. The three-month project that reaches its second anniversary with the contractor line-managing two people and attending the away day is the most common IR35 failure there is, and nobody decided it; it just happened.
10. Off-board and keep the relationship
Handover documented, access removed the same day, final invoice reconciled against the timesheets, and a note of how they did. The best contractors are the ones you can call again, so keep a record of who was good at what and stay in touch between engagements. A contractor talent pool you've actually worked with is worth more than any database.
Where a managed service fits
If the ten steps above sound like a lot to own alongside the day job, that's what a managed service is for. Our MSP runs contractor hiring end to end: sourcing across the right suppliers, the paperwork and evidence behind each status determination, compliant engagement and payroll routes, pre-employment checks, onboarding and off-boarding, and reporting that shows you every contractor, their status, their spend and their end date on one page. For businesses that want to check their existing population first, an IR35 audit reviews the engagements you already have against the working reality; we can help you with that too.
Contractor hiring doesn't have to be a headache, but it does have to be a process. If yours isn't one yet, get in touch and we'll tell you where it's leaking.
This article is general commentary on hiring contractors in the UK as we understand it at the time of writing. It isn't legal or tax advice. Engagement routes, status and contract terms depend on the facts of each case, so take specialist advice before relying on anything here.
Contractor hiring, answered
Mostly how they are engaged and paid, not what they do. A contractor usually works through their own limited company or an umbrella company on a day rate for a defined piece of work. A temp is typically on an agency's payroll, paid hourly or weekly, and used for cover or volume. An interim is a senior contractor brought in to hold a leadership role or run a programme for a fixed period. A consultant is engaged by their firm to deliver an outcome, often under a statement of work rather than a day rate. The labels overlap in practice, so decide the engagement route first and let the label follow.
There is no time limit in the off-payroll rules, and the widely repeated "two-year rule" is about travel and subsistence expenses, not employment status. What changes over time is the working reality: a contractor engaged for a three-month project who is still there after two years, attending team meetings, line-managing people and taking whatever work comes next, looks like an employee whatever the contract says. Review status at every extension, ask whether the engagement still matches the original determination, and if the role has become permanent in all but name, either re-engage it properly or offer them the job.
Yes, and for a good one it is often the best outcome for both sides. Three things to check first. If they came through an agency, the terms will usually include a transfer fee or a notice period before you can engage them directly; read those before the conversation. Agree the salary against their day rate honestly, because a rate that looked generous as a contractor rarely converts to a matching salary once holiday, pension and employer's National Insurance are counted. And treat the switch as a new hire: contract, checks and onboarding, not a quiet change of payroll.