So far, around eight million people have filed their self-assessment return for the 2016/17 tax year.

But more than three million are still outstanding, according to HM Revenue and Customs (HMRC).

Anyone who sends their tax return after the 31 January deadline will receive an automatic £100 penalty, even if no tax is due.

However, the longer the delay the more you’ll be fined.

Angela MacDonald, HMRC director general of customer services, said: “The seven day countdown to 31 January has now begun. Put a stop to that niggling feeling and do your self-assessment now. Our helpful online services offer support and advice, so you can complete your tax return quicker than you think.”

Self-assessment customers can submit their return through their personal tax account. It takes five minutes to sign up for a personal tax account. If you think you won’t be able to submit your tax return by 31 January, HMRC said you should call it so it can help you.

See YourMoney.com’s Top tips to file your online tax return on time.