The UK tax authority has failed to order enough special paper, causing a delay in statements about unpaid tax.
HMRC usually tells people who have to pay their taxes "on account" that they should make two estimated tax payments, one by 31 January and the other by 31 July.
But this year the statements for July have been delayed for some people. HMRC said it underestimated the number of forms printed on special paper - similar to credit card statements - that were required.
For the full story see http://www.bbc.co.uk/news/business-14291641