The increase to the 2008-2009 personal allowance takes effect on 7 September.
This is backdated to 6 April, meaning that some employees will be entitled to a refund of tax.
Employers usually fund these repayments out of their other PAYE deductions, by reducing their next payment to HMRC.
However, recognising that a business's next payment may be insufficient to cover the employee refunds, the Revenue says employers can claim funding from the department to cover the balance.
HMRC have set up an email facility via their website for employers to make use of such an opportunity.