Nearly two million self-assessors missed the 31 January deadline to file their 2019-20 tax return, according to HMRC.
The tax authority was expecting to receive 12.1m self-assessment tax returns this year, but only 10.7m were filed by midnight on 31 January. By comparison, 958,296 people missed the filing deadline last year.
This comes after it announced it would waive the £100 late-filing fees throughout February - however, the penalties for paying your tax bill after this date are still in place.
Some of the missing tax returns may also be down to those who don't realise they need to file. An increasingly common reason for this is child benefit claimants who owe tax due to the high-income charge rule.
Here, Which? explains what charges still apply for missing the 31 January deadline and when late tax return penalties will kick in this year, plus whether you need to file a tax return if you claim child benefit.
While the late penalty to file your tax return won't be levied throughout February, the penalty for paying your tax bill late will still kick in if you owed money and didn't pay by 31 January.
Initially, this is 2.6% interest on the tax you owe - but it increases over time.
There are also penalties for those who filed tax returns with errors or mistakes - but only if HMRC doesn't think you've taken 'reasonable care' filling it out, or if it thinks you're deliberately underestimating the tax you owe.
These penalties are separate, and may be charged in addition to any late fees:
In normal circumstances, a £100 fine is charged to anyone who files their tax return after midnight on 31 January, with charges quickly increasing the later you submit your return.
However, due to the impact of the coronavirus pandemic, HMRC announced on 25 January that it would waive fines for late tax returns throughout February.
So, while the 31 January deadline remains, you won't get the £100 fine if you file by 28 February.
However, if you miss the February deadline, then the late filing charges will kick in as usual. The late filing penalties work like this:
An increasing number of people are facing fines from HMRC after failing to pay the tax owed from claiming child benefit.
Following a Freedom of Information (FOI) request, HMRC revealed that it's been increasing the number of child benefit compliance checks - both for those who have not registered for self-assessment and should have done, and those who returned the incorrect amount of child benefit.
These checks doubled from 63,591 in 2018-19 to 125,594 in 2019-20 - and, in the case of the 2019-20 checks, 96% of these had tax owing.
Failing to notify HMRC about owing child benefit payment, or paying the wrong amount, can result in a penalty.
You'll only need to file a tax return if you or your partner have an income of £50,000 or more - that's individual income, not joint. HMRC defines a partner as being a spouse or civil partner you're not permanently separated from, or someone you're living with as though they were a spouse.
If this is the case, you'll have to pay the 'high-income child benefit charge' (HICBC), which equates to 1% of the child benefit paid for every £100 of income between £50,000 and £60,000. If you or your partner earn £60,000 or more, you'll have to repay all of the child benefit you've received.
This online tool allows you to tot up your tax bill, suggests allowances and expenses you might have forgotten, and can even submit your return directly to HMRC.
It's easy to use, totally jargon-free and covers a wide range of income sources.