Which? Money reveals the common tricks scammers use when posing as the taxman - and how to spot them.
Teenagers are the most likely age group to meet the tax return deadline, with one in 12 filing after 31 January last year.
As the tax return deadline approaches, Which? Money lists the tax-free allowances that could help you earn more than £30,000 without paying a penny in tax.
Even if you don't have to pay taxes via self-assessment, not filing a tax return could mean you end up paying far more than you need to.
Thousands of people filed self-assessment tax returns over Christmas Eve, Christmas Day and Boxing Day, data from HMRC reveals.
Tax rules on property income and allowances are most likely to confuse self-assessed taxpayers, finds new Which? research
HMRC must prepare back up plans to avoid another “catastrophic collapse” in customer service, says influential cross-party group of MPs' annual review.
Which? summarises the personal tax changes announced in Philip Hammond's inaugural Autumn Statement.
The deadline for paper tax returns is 31 October 2016. If self-assessment taxpayers miss this they face a £100 fine. Alternatively, they can file online.
HMRC service levels collapsed in 2015 as staff were shed to cut costs. The average telephone wait time tripled, finds a National Audit Office report.