This deadline is relevant to employers who have made PAYE deductions from their employees' salaries and to contractors who have paid subcontractors under the CIS.
Employers are required to make payment to HMRC of the income tax, national insurance and student loan deductions. Contractors are required to make payment to HMRC of the tax deductions made from subcontractors under the CIS.
Postal payments for month/quarter ended 5 April should reach your HMRC Accounts Office by this date.
Where the payment is made electronically the deadline for receipt of cleared payment is Friday 20th April 2018 unless you are able to arrange a 'Faster Payment' to clear on or by Sunday 22nd April.
Penalties apply if payment is made late.