Tax payers are being advised to avoid the last minute rush and complete their 2017 to 2018 Self Assessment tax return early. With just under 100 days to go until the 31 January 2019 deadline – which may seem like plenty of time – so many leave things until after Christmas. Last year 44.8% of the £11million who filed returns online did so in January, with 758,707 people completing on deadline day. If customers miss the deadline, they can face a minimum £100 penalty for late submissions.