You need to submit your employment allowance claim at the start of each tax year. 

If you've already stated you're not eligible for employment allowance in error, you'll need to change your claim.

 CAUTION: You can't claim employment allowance for a previous tax year in Sage Payroll. For guidance on this, contact HMRC via gov.uk. 

To submit your employment allowance claim

We've simplified the employment allowance claim process. You only need to confirm that you're eligible for employment allowance, to the best of your knowledge.

1. From the Summary tab, under HMRC Real Time Information (RTI) Scheme, select Submit Claim.

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2. Decide whether to use your saved credentials, or enter them manually.
3. Tick 'I confirm that, to the best of my knowledge, this company is eligible for Employment Allowance.'
   
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4. Select Submit.

You can view the status of your claim from the Summary tab.

HMRC notifies you within five working days if you don’t qualify for Employment Allowance.

The Employment Allowance Claim section can display the message:

"You’ve indicated that you aren’t eligible for Employment Allowance".

This message is now permanent. It doesn't stop you from claiming Employment Allowance.

I forgot to enter my Employment Allowance to date.