PAYE, which stands for Pay As You Earn, is the main system used to collect income tax and National Insurance contributions in the United Kingdom. For expats, PAYE means that tax is automatically deducted from wages or salary by the employer before payment is made. Expats in the UK do not usually need to take any action themselves if they are employed under PAYE, as their employer handles the calculations and payments to the tax authority. Each expat is assigned a tax code, which determines how much tax is deducted based on personal allowances and circumstances. Expats in the UK should check their payslips to ensure the correct tax code is being used, especially in the first months of employment. If income changes or an expat has more than one job, adjustments may be needed. PAYE simplifies tax compliance for most expats working in the UK.