Emergency tax is what payroll applies when it does not yet know enough about you to calculate the right deduction. Faced with a choice between under-deducting and over-deducting, every tax authority instructs employers to over-deduct, because the alternative creates a debt they have to chase.
The result is a first payslip, and sometimes a second and third, that is materially lighter than expected. It is recoverable in every system covered here, but the speed and the mechanism vary.
What triggers it
- Starting a first job, where no tax record exists yet.
- Changing employers without providing the leaving documentation from the previous one.
- Returning to work after a period abroad, when the record has been closed.
- Holding two jobs at once, where the allowances are already in use elsewhere.
- Arriving in a country before the tax number has been issued, which is the most expensive version.
The United Kingdom
Without a P45 or a completed starter checklist, an employer applies code 0T on a week 1 or month 1 basis. That means no personal allowance at all, and each pay period taxed in isolation.
On a £50,000 salary, a month taxed under 0T deducts roughly £1,000 of income tax against the £624 that the correct code would take. The overpayment is around £376 in a single month, and it repeats until a proper code arrives.
The fix is a starter checklist, submitted to the employer on day one. Once HMRC issues a cumulative code, the next payslip repays the excess automatically, because PAYE recalculates the whole year at every run. Nothing needs to be claimed unless the tax year has already ended, in which case a refund claim covers it. The code structure itself is set out in the guide to UK tax codes.
Ireland
The Irish emergency basis grants a reduced tax credit and rate band for the first four weeks, then removes them entirely. From week five onwards, income is taxed at the higher rate with no credits at all, and USC is applied at the top emergency rate.
It is triggered by the absence of a Revenue Payroll Notification, which the employer requests once you register the employment through Revenue's online service. Registering promptly, using the employer's tax registration number, ends it. Refunds arrive through payroll once the correct notification is in place. What the correct deduction should look like is in what 60,000 euros leaves in Ireland.
The Netherlands
The Dutch version is the most punitive on this list. Without a BSN, or where the employee has not supplied identity documentation, the employer applies the anoniementarief, the anonymous rate, at 52% of gross with no tax credits whatsoever.
On a 45,000 euro salary that is roughly 1,950 euros a month withheld against a correct figure nearer 700. The money is recoverable through the annual return, but the wait can run to well over a year, and the cash flow damage lands precisely when someone has just relocated and paid a deposit.
The fix is administrative rather than fiscal: register with the municipality, obtain the BSN, and supply it along with identity documents before the first payroll run. Employers cannot waive it.
Germany
German payroll needs your Steuer-ID to retrieve your electronic wage tax details. Without it, the employer must apply Steuerklasse VI, which grants no allowances at all and withholds at the heaviest rate in the system.
The Steuer-ID arrives by post a few weeks after registering your address, which is why the sequence matters: Anmeldung first, Steuer-ID second, payroll third. Overpaid tax comes back through the annual return, which is straightforward but not fast. Tax class mechanics are covered in the guide to German tax classes.
What it costs, roughly
Preventing it
- Register your address and obtain the local tax number before the first payroll cut-off, not after. In Germany and the Netherlands this is the whole battle.
- Hand over the leaving documentation from your previous employer on day one. In the UK that is the P45, described in the payroll paperwork guide.
- Where there is no P45, complete the starter checklist rather than leaving it. The checklist exists precisely to avoid 0T.
- Check the second payslip as well as the first. A code that has not changed by then usually means something did not reach the tax authority.
- Compare the deduction against what it should be. Any country calculator gives the correct annual figure to scale from.
One consolation: in cumulative systems, overpaid tax is genuinely returned rather than merely credited. In the UK and Ireland the repayment usually arrives in a single payslip and looks like an unexpected bonus, which is the only pleasant thing about the entire process.
Work out what the deduction should be at your salary using the Ireland Salary Tax, Netherlands Salary Tax or UK Salary Tax, then compare it against the payslip.