The Treasury Select Committee (TSC) has stressed to the government that HMRC must not be above the law and should remain subject to legal challenge.
Businesses have been reminded of their obligation to file corporation tax online from next month.
Taxpayers are being given just days to pay bills totalling thousands of pounds in the latest clampdown by HM Revenue & Customs.
HMRC is clamping down on qualifying recognised overseas pension scheme (QROPS) abuse through investigations by its Anti-Fraud Unit (AFU).
HMRC will bring in harsh new penalties for evading income and capital gains tax abroad from 6 April.
HMRC is creating new figures to calculate drawdown limits which could reduce pensioner incomes, experts warn.
Millions risk losing out on their state pension because they have not been credited with paying £1.2bn in National Insurance (NI).
Tax bosses are facing an inquiry into how they strike deals with multinationals following accusations that Vodafone was let off a £6bn bill.
The number of non doms has fallen by almost 16,000 following a levy imposed on offshore earnings - the first decline in half a decade.
A further 450,000 people will be trapped in the government's tax chaos, HM Revenue and Customs admitted yesterday.