If you have submitted an EPS (Employer Payment Summary) in previous tax year activating employment allowance you do not need to notify HMRC again for the current tax year. The option will remain activated in both your payroll software and in HMRC records. Continue with your payroll as normal, you will only need to send an EPS if the normal requirements apply for statutory payment recovery/compensation, CIS deductions suffered or inactivity of PAYE.
For how to set up and Claim the Employment Allowance? click on the link below: