Google's UK tax 'disproportionately small'

Britain's Committee of Public Accounts says the amount Google agreed to pay in a tax settlement with the government is "disproportionately small" when compared with the size of the company's business in the country.

Google, a unit of Alphabet Inc, agreed in January to pay STG130 million ($A252.6 million) in back taxes to Britain, prompting criticism from opposition MPs and campaigners.

The committee called on the UK tax authority (HMRC) to monitor the outcome of other tax authorities' investigations into Google and re-open its settlement with the company if relevant new evidence became available.