HMRC's new Money Laundering Regulations (MLRs) come into effect this weekend.
They will affect money service businesses, trust or company service providers, high value dealers, and accountancy service providers.
HMRC's business director of money laundering regulations, Melissa Tatton, said: 'Businesses that are affected by the money laundering regulations will need to have the right processes in place so they can hit the ground running.
'From 15 December, businesses that have to take action under the Money Laundering Regulations need to put anti-money laundering controls in place.
'We also want to alert businesses to the need to register with HMRC, to ensure that they get their applications in before the legal deadline for their type of business. We recommend sending them in early.
'Any businesses that are uncertain whether they may be affected should take a look at our website to find out more about what to do next and how to register.'
More information can be found at www.hmrc.gov.uk/mlr.