Where a P35 remains outstanding after 19th May, HMRC will write to you advising that a penalty may already have been incurred and that the return must be with HMRC by 19th June in order to avoid further penalties.
Penalties for late P35s are calculated at £100 per 50 employees for each month or part month you delay filing your return.
If your return remains outstanding for more than four months, you'll receive a penalty notice shortly after 19th September and again the following January and May, if necessary. These penalty notices will show the amount of penalty that's building up because you haven't filed your return on time and should tell you how you can pay it.
Please also note that there is a separate penalty regime for the late submission of P11D(b)s, which must be filed by 6th July.
The filing requirements for this year and moving forward look very different since the introduction of Real Time Information. If you are finding it difficult to keep up to date with your responsibilities as an employer, feel free to get in touch with your local TaxAssist Accountant who can take care of your payroll for you.