P11D(b) must be filed with HMRC by 6th July, if HMRC do not receive it by the 19th July a penalty will be issued. Penalties accrue for each month (or part month) that your P11D(b) is outstanding at £100 per 50 employee.
Failure to submit a P11D or P9D altogether can attract a maximum initial penalty of £300 per form, plus continuing penalties of a maximum of £60 per day thereafter.
You can apply to HMRC for a Dispensation to cover expenses or benefits for which your employee gets a full tax deduction. This includes many routine business expenses and benefits (e.g. reimbursement of out-of-pocket expenses). A Dispensation removes the requirement for an employer to report certain expenses and benefits at the end of the tax year on a P11D or P9.
For more about Dispensations, see our previous post here http://kentpayrollbureau.co.uk/2014/01/