Why HMRC's PAYE Review Should Worry Umbrella Workers

Tax Queen

Tax Expert @ Pie

3 min read

HMRC is working through 45 million PAYE records this year, sending out P800 tax calculations to anyone who's paid too much or too little tax. The review is running until November 2026 and applies UK-wide, but if you work through an umbrella company, it's worth paying closer attention to than most, since umbrella workers are especially likely to trip the kind of tax code mismatches HMRC is now checking for.

What's Happening, and Does It Affect You?

If you're not familiar with umbrella companies, they're a common setup for contractors: rather than working through your own limited company or as a sole trader, an umbrella company employs you on paper and processes your pay through PAYE, deducting tax and National Insurance before you're paid.

It's popular because it removes a lot of the admin that comes with running a limited company, but it also means your tax position depends on the umbrella company getting things right, assignment after assignment.

Why Umbrella Workers Are More Exposed

Seb Maley, chief executive of contractor insurer Qdos, put it plainly: umbrella and contract workers move between assignments and employers more often than people in a single permanent job, which means there are simply more opportunities for something to go wrong with their tax code. HMRC itself acknowledges that starting and finishing jobs, or being placed on an emergency tax code between contracts, is a common cause of over- or underpayment.

If you've switched umbrella companies partway through a tax year, been between assignments, or held more than one contract at once, it's worth checking your tax code rather than assuming it's automatically correct. Our guide to umbrella companies covers how the arrangement works in more detail, including what the umbrella company is and isn't responsible for.

If You Get a P800, Don't Assume the Money Lands Automatically

HMRC is prioritising overpayments first, so if you're owed money, you should hear from HMRC before anyone who's underpaid. But a P800 doesn't always mean an automatic refund. For many multi-year calculations, you'll now need to actively claim the money rather than wait for a cheque, so read the letter carefully to see what it's asking you to do. We've covered the mechanics of that claims process, including timelines and what to check on the letter itself, in our fuller guide to the recent P800 refund change.

More than 730,000 refunds went unclaimed last year, averaging £855 each, so it's not a letter worth setting aside.

Where This Gets More Complicated: Mixed Income

If your only income is through an umbrella company, this review is purely a PAYE matter between you and HMRC, and it's your umbrella company, not Pie Tax, that handles that side of your tax. But plenty of contractors don't stop there. If you also invoice clients directly, run a side business, or have rental income alongside your umbrella work, that additional income falls under self-assessment, and it's reported separately from anything HMRC adjusts through your P800.

To be clear about where Pie Tax fits in: we're self-assessment software, built for the self-employed side of your income, not for umbrella payroll or PAYE. If you're unsure whether your situation means you need to file a self-assessment return at all, our guide on when you have to submit a self-assessment return is a good place to start. And if HMRC ends up owing you money through self-assessment rather than PAYE, the process is different again, our guide to what happens when HMRC owes you money after your return explains how that works.

If you do have income outside your umbrella company, Pie Tax can help you track and file that self-employed or rental income properly, alongside what's already being handled through PAYE, so nothing falls through the gap between the two systems. You can see how Pie Tax works here.

Watch Out for Scams

As with any HMRC repayment story, scams tend to follow. HMRC has reiterated that it will never ask you to claim a refund by responding to a text message or email. If you get a message claiming to be from HMRC about a tax refund, don't click any links, go directly to Gov.uk instead.

What to Do Next

If you work through an umbrella company, or move between contracts often, take a proper look at your tax code and any P800 that lands over the next few months rather than assuming HMRC has it right. And if your income stretches beyond PAYE into self-employment or rental income, that's the point at which self-assessment software becomes genuinely useful.

Staying on Top of Your Refunds and Your Tax

If your P800 relates purely to PAYE income from a job, this is between you and HMRC. PAYE is handled by your employer and HMRC directly, so there's nothing to file yourself, just the checks and claim steps covered above.

Where it gets more complicated is if you also have income outside PAYE, such as freelance work, a side business, or rental property. That income falls under self-assessment rather than PAYE, and it's reported separately from anything on your P800.

This is exactly where Pie Tax comes in, as self-assessment software built for sole traders, freelancers, landlords and the self-employed, helping you keep that side of your income and expenses organised throughout the year rather than scrambling at filing time. If you're curious how Pie Tax works, or want to see current pricing, it only takes a few minutes to look around. If you've got self-assessment income to manage alongside your PAYE job, you can sign up for free today and keep that part of your tax affairs sorted, separate from whatever HMRC decides about your P800.

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