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When your Type 2 observation window has to open

The observation window is the one part of a Type 2 that cannot be bought, compressed or backdated. This works out the latest date it can open and still produce a report by the day somebody promised.

Last reviewed 2026-09-14Written by Jacob Masse, TrazTech Inc.

A SOC 2 Type 2 opinion covers a period. The period has to have happened, with the controls operating and the evidence kept as it went, before an audit firm can say anything about it. Money does not shorten that. Neither does an audit firm with capacity, a compliance platform, or a very motivated sales team.

This takes the date a customer named and works backwards through the report issue lag, fieldwork, the window itself, and the readiness work that has to finish before the window opens. It returns four dates and tells you whether they fit. The plan renders on this page and nothing is emailed anywhere unless you ask for it at the end.

What date does the report have to exist by?

The contract date, the renewal date, or the date the deal is meant to close. If there are two, use the earlier one.

How long a window does the buyer expect?

Three months is a legitimate first Type 2 period and is widely accepted. Twelve months is what a report settles into once it is renewed annually.

Where are your controls today?

This decides how long it is before the window can open. Be honest here rather than optimistic, because everything downstream moves with it.

Where are you with an audit firm?

The window can technically open before a firm is engaged. It is a bad idea, because the firm decides what evidence it will accept for the period you have already started running.

Is there a current penetration test?

Auditors expect testing inside or shortly before the window, with evidence the significant findings were fixed. Booking one is commonly two to six weeks of lead time on its own.

Who is running this internally?

Evidence collection is a job. Whether somebody owns it decides whether a window that opens on time also closes cleanly.

How many people work there?

The four stages, and which of them move

What each stage costs in elapsed time, and whether money changes it
StageTypical durationCan it be shortened
Readiness, up to the window opening4 to 20 weeksYes. This is the stage outside help actually compresses
Engaging an audit firm2 to 6 weeksPartly. Quotes and scoping calls take calendar time
The observation window3, 6 or 12 monthsNo. It is elapsed time and nothing else
Fieldwork and report issue4 to 10 weeks after the window closesSlightly, by answering the evidence request fast

Only the first and the last are negotiable, and the last is mostly in your hands rather than the firm's: fieldwork stalls on evidence that has not arrived far more often than on auditor capacity. The window is fixed by arithmetic. That is the whole reason to plan backwards from the deadline rather than forwards from today.

When the window does not fit

There are three honest answers and one dishonest one. The honest answers are a shorter window, a Type 1 on the customer's date with the Type 2 behind it, or a later date agreed in writing with the customer. The dishonest one is opening a window retroactively and assembling evidence for a period that has already run. Auditors test evidence for signs it was created after the fact, dates are the first thing they look at, and the outcome is an exception in a report you are about to hand to the customer who asked for it.

A Type 1 plus a signed Type 2 engagement letter with the period end date on it satisfies a surprising share of buyers, particularly when it arrives early in the conversation rather than the week before signature. Type 1 against Type 2 covers what each one actually says, and bridge letters cover the gap between a report period ending and the next one closing.

Common questions

Is a three month window really acceptable?

For a first Type 2, yes, and it is common. Most vendor risk teams accept it and expect the next report to cover a longer period. What draws questions is a second or third report still covering three months, because at that point the short window looks like an attempt to narrow what gets tested.

Can the window start before we engage an audit firm?

Technically yes. In practice it is a gamble, because the firm you later engage decides whether your evidence for that elapsed period is sufficient, and you will have no chance to fix what is missing. Engaging first costs a few weeks. Getting it wrong costs the window.

What if our controls only started operating halfway through?

Then the window started halfway through, whatever the calendar says. A control that was implemented in month two of a three month period cannot be tested as operating for the period, and the result is an exception or a shortened period. This is the most common reason a window has to be reopened later than planned.

Does the report cover us after the period ends?

No. The opinion covers the period stated and nothing after it. Customers asking about the months since then are answered with a bridge letter from management, which is an assertion rather than an audit opinion, and it is conventionally limited to about three months.

How long after the window closes does the report arrive?

Four to ten weeks is the realistic band, with the spread driven mostly by how fast you answer the evidence request. Firms that quote two weeks are describing their own drafting time rather than the whole path, and a quoted issue date that assumes instant responses from you is not a date you should give a customer.

Find firms with capacity on these dates

Take the window you just planned to Canadian audit firms and find out who can commit to it.

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