Please read the below excerpt from GOV.UK
For employees who joined an employer provided childcare voucher scheme from 6 April 2011, the employer must make an estimate of the employee’s relevant earnings amount
for the tax year that childcare vouchers are provided for (see EIM16053
The estimate is the employer’s responsibility. The estimate will establish the “exempt amount” for that tax year. In making the estimate the employer should act reasonably, taking due care. The estimate should be based on information available at the time. The employer is not required to speculate on what may or may not take place in the future.
Providing that the employer acted reasonably, the estimate should not be reviewed later in the tax year whether as a result of a change in the employee’s circumstances or because events show that the estimate was misconceived. Any change in the employee’s circumstances should be reflected in the estimate for the next tax year.
Relevant earnings amount
This is calculated for each tax year by first adding:
- the amount of any relevant earnings for the tax year from that employment and
- any other amounts treated under Chapters 2 to 12 of Part 3 ITEPA 2003 as earnings from that employment
- the sum of any excluded amounts (see EIM16056).
Meaning of “relevant earnings”
For this purpose, “relevant earnings” means any salary, wages or fees and any of the following:
- guaranteed contractual bonuses;
- contractual commission;
- guaranteed overtime payments;
- location or cost of living allowances;
- shift allowances;
- skills allowances;
- retention and recruitment allowances; and
- market rate supplements.
Estimate made during a tax year
If an employer is required to make an estimate of the employee’s relevant earnings amount for a tax year because
- the employee joins the employer provided childcare voucher scheme, and
- the employee only began that employment during the tax year,
for the purpose of making the estimate, the employer should not take account of any previous earnings.
The employer should estimate the aggregate sum of the amount of any relevant earnings and any other amounts treated as earnings from that employment for the remainder of the tax year. That sum must then be multiplied by a figure calculated using the formula:
where RD is the number of days remaining in the tax year from the date that the employment began.
The sum of any excluded amounts is deducted after making this adjustment.
What will Computershare do?
We will contact a parent on your behalf, if you have reduced their order following a tax band change, or if they have reached their allowance. You may want to tell your employees who receive childcare vouchers, what their childcare allowance is for the 2016-17 tax year.
Where do I file it?
You don’t need to file this with HMRC, but you must keep a copy of the assessment on file (paper or electronic). The HMRC will look for it during a PAYE Investigation.
Is it important?
Yes, employees will only make tax and National Insurance savings on payments within the relevant limits if you have carried out a BEA.
Without it, the value of the childcare vouchers supplied will be subject to income tax and National Insurance contributions.
Where can I find out more information?