Regulation 6 of the Social Security Contributions (Decisions and Appeals) Regulations 1999 (SI 1999 No 1027)
HMRC Officers can issue a decision which supersedes an earlier decision or varied decision that
- has been made covering an open-ended period of time, and
- is correct for the period up to the date on which it is made, and
- later on cease to be correct after there is a change in the relevant circumstances.
A superseding decision has effect from the date of the change in circumstances, which caused rendered the earlier decision to be inappropriate. The earlier decision ceases to have effect as soon as the superseding decision, which carries with it the normal appeal rights, has effect.
There are currently no plans to make decisions covering an open-ended period of time (i.e. which include a future period of time). So, superseding decisions are not needed. If you consider that you should make a decision covering an open-ended period of time, send a report to Central Policy (Tax Administration Advice).