This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Securities Guidance

Calculating the amount of security: introduction

When we require a person to give security we calculate the amount we require using a formula called the ‘quantum’.

The quantum calculates future revenue at risk of not being paid. We can add to that figure an amount of actual debt the person has at the time we require security.

It is important that we use the methods set out in this chapter to calculate the amount of security. These are methods that tribunals have found to be acceptable.