The discipline this assignment requires
A retrospective appraisal answers what a property was worth on a specific date that has already passed. The report is written now; the value is as of then.
Everything hard about it comes from one rule: the analysis may only use what the market knew on the effective date.
You cannot value a March 2022 date of death using the sales that closed that autumn. Nor can you quietly let your knowledge of what happened next colour the conclusion.
That is hindsight, and it is the flaw that gets retrospective reports discounted by the people reading them.
The narrow exception is confirmation. Data from after the effective date may corroborate a trend the analysis already established from contemporaneous evidence.
Used to reach the conclusion rather than to check it, the same data is a defect.
When you need one
| Purpose | Effective date |
|---|---|
| Estate, basis step-up, NJ inheritance tax | Date of death (or six months after, under the §2032 election) |
| Property tax appeal | October 1 of the pre-tax year |
| Divorce | As specified by counsel — frequently not the filing date |
| Casualty or damage claim | Immediately before the loss |
| Litigation generally | As specified by counsel or by the pleadings |
| Charitable donation, gift | Date of the transfer |
The tax appeal line is the one that costs people money. New Jersey assesses as of October 1 of the pre-tax year.
So an appeal against a 2026 assessment needs an October 1, 2025 effective date. Appraisals ordered with today’s date get no weight — and the owner finds out at the hearing.
Condition, when the property has changed
It does not prevent the assignment. It changes how condition at the effective date is established.
By the time a retrospective appraisal is ordered, the property has usually moved on: cleared, renovated, sold, occasionally demolished.
Which is what makes your documentation valuable:
- Listing photographs from around the date
- A home inspection report
- Permits and contractor invoices, which date the work
- Insurance photographs, for casualty claims
- The executor’s or owner’s own account
From that, the report states an extraordinary assumption about condition at the effective date and discloses it plainly.
A reader can then weigh the conclusion knowing what it rests on. The more evidence you supply, the narrower that assumption gets — and the stronger the report.
What limits how far back
Data, not statute. New Jersey is comparatively good ground for this work.
County clerk records and MOD-IV assessment data give reasonably reliable sales history, so effective dates several years back are ordinarily workable.
Where it gets harder:
- Low-turnover municipalities. A township with a handful of sales a year does not offer much to work from in a twelve-month window around the effective date.
- Unusual property types. Equestrian properties, converted structures, multi-parcel holdings — thin in the present, thinner in the past.
- Quiet markets. Effective dates falling in a slow period have less contemporaneous evidence by definition.
None of these are disqualifying. They affect how long the research takes, and how much the report has to say about the limits of the data.
That is why turnaround on this assignment runs longer than on a current appraisal, and why some effective dates are quoted individually.
What you receive
A written report labelled as retrospective, carrying the specified effective date and the comparable sales from around it.
It analyses market conditions as they stood then, discloses any extraordinary assumptions, and carries a signed USPAP certification.
Tell us the effective date and the purpose when you call. Where the date you have been given does not match the purpose — most often on tax appeals — it is far better to catch that before the work starts.
New Jersey specifics
- Tax appeal assignments need an effective date of October 1 of the pre-tax year. This is the most common retrospective date requested in New Jersey and the one most often ordered wrongly.
- Date-of-death assignments for the New Jersey inheritance tax and for basis step-up need the date of death, which can be years back where an estate was slow to settle.
- New Jersey has good public sales records through county clerk and MOD-IV data, so older effective dates are usually workable — but data thins out in low-turnover municipalities and rural Hunterdon, Sussex and Warren townships.
What you receive
- Appraisal report with the specified past effective date, clearly labelled retrospective
- Comparable sales that closed at or around the effective date
- Analysis of market conditions as they stood on that date
- Disclosure of any extraordinary assumptions regarding condition at the effective date
- Signed USPAP certification
What we need from you
- The exact effective date required, and what it is required for
- Any evidence of the property's condition at that date — photographs, listing sheets, inspection reports, permits
- Current access where the property still exists in comparable form