Why this is a planning calculator
The arithmetic is the easy part. The governing rule may define the trigger date, whether the first day counts, what “business day” means, how public holidays are treated, and whether service method changes the period. This tool cannot infer those rules.
Safer workflow
Write the source rule beside the result, keep an earlier internal target, and save proof of submission. Read the deadline guide before relying on a calculated date.
Quality check before you act
- Compare the result with the original notice, receipt, form or decision.
- Remove any generated wording that is not accurate.
- Verify current forms, portals, fees and deadlines at the official source.
- Save a dated copy of what you finally submit.