Work out when an organisation should respond to your subject access request, with the legal start date, any valid stop-clock period and the reason for every adjustment explained.
How the calculation works
One month can be more than 30 days.
The normal rule
A subject access request normally has to be answered without undue delay and within one calendar month. The calculation starts from the actual date the organisation receives the request, even if that date is itself a weekend or bank holiday.
If the operative start date is 31 January, the corresponding date is the last day of February. If that date is a weekend, the deadline moves to the next working day.
ID, authority and fees can change the start date
Where the organisation reasonably needs information to confirm identity, evidence that a representative is authorised, or a fee that the law permits it to charge, the one-month period runs from receipt of the relevant information or payment. ID demands should still be reasonable and proportionate.
Clarification can stop the clock
If clarification of the personal information requested is genuinely and reasonably required, the clock pauses on the day clarification is requested and resumes the day after it is received. The organisation cannot use clarification simply to force a valid broad SAR into a narrower request.
Complex or multiple requests
Where necessary because the request is complex or the person has made a number of requests, the organisation may extend by a further two months. It should tell you and explain why within the original response period. The extended calculation is three months from the operative start date, with any valid clarification pause also taken into account.
Weekends and public holidays
If the corresponding deadline lands on a weekend or public holiday, it moves to the next working day. That is why a lawful SAR response date can sometimes be 31, 32, 33 or more calendar days after the operative start date without the organisation having received a formal extension.
The tool checks the official GOV.UK bank-holiday data. For the legal guidance behind the calculation, see the ICO guide to subject access.
What this tool cannot decide for you
It can calculate from the facts you enter, but it cannot decide whether an ID demand, clarification request, fee or extension was legally justified. Where one of those points looks questionable, the result flags it for you to investigate rather than silently accepting it.
Your output
Keep the working record.
Where the tool supports it, export your work to CSV, JSON, plain text or Print/PDF. Keep the source documents separately: an exported summary helps organise a case, but does not replace the original evidence.
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