Guide
Calculation of value or conclusion of value: which you need
Updated
This is the choice most buyers of valuation work are actually making when they compare two quotes with very different numbers on them, and it is usually not explained to them in those terms.
What separates them
A calculation of value is an engagement where the analyst and the client agree in advance which approaches and methods will be applied and which will not. The output is a calculated value.
A conclusion of value has no such restriction. The analyst applies what they judge appropriate, considers the approaches the IRS guidelines tell examiners to consider, and expresses an opinion of value.
Why the fee gap is real
The restriction removes work, and it removes the most expensive work: building a comparable transaction set, running a second approach as a cross-check, and documenting a reconciliation between them.
So the lower fee is not a discount, it is a smaller job. Treating the two quotes as competing prices for the same thing is the error, and it is an easy one to make because both documents are called valuations.
Where a calculation is the right answer
Deciding whether a sale is worth exploring. Setting an internal expectation before a board discussion. Testing whether a shareholder agreement's formula produces a sane number. Working out whether the full engagement is worth commissioning at all.
In all of those, the reader is somebody who agreed the scope restriction, which is exactly the condition under which the restriction costs nothing.
Where it is fatal
Anywhere the reader did not agree the restriction. A calculation discloses its own limited scope, in the report, in writing, because it is required to. That disclosure is the first thing an opposing expert quotes and the first thing an examiner notices.
The expensive version of this is commissioning a calculation, using it in a negotiation or a filing, and then commissioning a conclusion when it is challenged. Two reports now exist, they disagree, and the difference between them is a question somebody will ask.