The taxman says three and a half million people are due a refund, but two million will have to fork out for underpaid tax.
Revised recession figures better
Revised figures for the construction sector helped cut the estimated fall in GDP
Britain's double-dip recession is not as deep as previously feared after revised figures showed a smaller contraction in the second quarter of the year.
Gross domestic product (GDP) - a broad measure of the economy - fell 0.5% between April and June in the Office for National Statistics' second estimate, which is better than the initial 0.7% drop that shocked the City last month.
But despite the upward revision, it still represents the biggest quarter-on-quarter fall for more than three years and means the economy remains mired in the longest double-dip recession since the 1950s.
Smaller than previously thought falls in the production and construction sectors drove the figure higher, while the powerhouse services sector was unrevised, with a 0.1% fall.
Figures released on Friday showed the UK's trade deficit increased to £7.3 billion, up from £3.7 billion in the previous quarter as the eurozone debt crisis hit exports - its biggest fall since the third quarter of 2010, which wiped 1% off the GDP figure. Business investment also fell for the first time for more than a year.
The improved GDP figures are unlikely to ease the pressure on Chancellor George Osborne who came under fresh fire to boost the economy last week when figures showed a shock increase in public sector borrowing in July.
A spokesman for the Treasury said: "Britain is dealing with some very deep-rooted problems at home and a very serious debt crisis abroad, and that is why the healing of the economy is proving to be a slow and difficult process.
"Compared to two years ago, the deficit is down, inflation is down, and there are more private sector jobs. The Government will continue to give its undivided attention to the economy - for example with recent announcements on infrastructure and lending."
The fall in production was revised up from minus 1.3% to minus 0.9%, while the ONS said construction fell 3.9% rather than 5.2% as previously estimated.
The figures suggest the extra bank holiday for the Queen's Diamond Jubilee and the washout start to the summer did not have as much of an effect as previously feared. Economists believe the extra bank holiday may have knocked as much as 0.5% off GDP, but the ONS said it was too early to measure the effect.
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