Stepped-up basis is the single largest tax break most timberland families ever receive — and the one most often forfeited because no one documented it at the right time. The mechanics are not complicated, but they are unforgiving on timing. Here's what every heir, executor, and CPA working on Southern timberland should understand.
Nothing here is legal or tax advice. Talk to a CPA and attorney about your specific situation. What follows is how foresters describe the mechanics they see every week.
What "basis" means
Cost basis is what the tax code says you "paid" for an asset. When you later sell, capital gains are calculated as sale price minus basis. A low basis means a large gain — and a large tax bill. A high basis means a small gain, or none at all.
For timberland bought decades ago, the original basis is usually tiny relative to today's value. A tract acquired in 1965 for $100/acre may be worth $3,000–$5,000/acre today, with mature timber worth another $1,500–$3,000/acre on top. Without a step-up, the family would owe capital gains tax on essentially all of that appreciation.
What "stepped-up basis" does
Under current federal tax law, when an asset passes through an estate at death, its basis is generally stepped up to the asset's fair market value on the date of death (or the alternate valuation date, if elected). That new, higher basis becomes the heir's starting point for future gain or loss calculations.
For timberland, this matters twice. The land gets a step-up. The standing timber gets a separately documented step-up. Both are real assets, both appreciate independently, and both should be valued at the date of death.
Why a separate timber valuation matters
If the family doesn't separately establish the value of the standing timber on the date of death, the IRS default is to treat any later timber sale as if the timber had zero basis — meaning the entire sale price is treated as gain. On a $200,000 timber sale that's a meaningful tax bill that a few thousand dollars of appraisal work would have eliminated.
A defensible date-of-death timber valuation requires a measured timber cruise and a current-market stumpage appraisal applied as of the death date. Done within a reasonable window of death — typically within 6–12 months — it stands up to IRS scrutiny. Done years later, it becomes an argument.
What the appraisal package should contain
- Plot data and cruise design from a measured cruise
- Per-acre and total volumes by species and product class
- Stumpage values applied to each product class, sourced to the prevailing regional market on the date of death
- Tract-level adjustments — access, haul, mill mix, harvest cost
- Land value sourced to comparable timberland sales in the same region and timeframe
- Total value separated into land and standing timber components
- Appraiser credentials, methodology, and signature
This package is what the family's CPA uses to file Form 706 (if the estate is large enough) or to support basis on Schedule D when the timber is later sold.
Special situations
Joint ownership. The step-up rules differ between joint tenancy with right of survivorship, tenancy in common, and community property. Mississippi is not a community property state; Alabama is not a community property state. Joint property between spouses in these states typically receives a step-up on only the deceased spouse's half. A CPA needs to confirm the form of ownership before the appraisal is filed.
Trusts. Property in a revocable living trust generally receives full step-up at the grantor's death. Property in an irrevocable trust may not — the answer depends on the trust's terms and how it was structured for estate tax purposes.
Multiple deaths in succession. Each death is its own step-up event. A tract that passes from grandmother to mother to child within five years may have had two step-ups in that span, each requiring its own documentation.
Why timing is unforgiving
The IRS doesn't reject late appraisals outright — it just gives them less weight. Stumpage markets move month to month and year to year. Reconstructing what a tract was worth on a date five years ago, from records that no longer exist, is much harder than valuing it within months of the event. Families who get the appraisal done while the executor is active almost always do better at audit than families who wait until the property is sold.
What stepped-up basis does not do
- It does not eliminate income tax on subsequent timber sales — it only resets the starting point.
- It does not change property tax assessments at the state or county level.
- It does not affect estate tax (which is a separate calculation) — only future income tax on later sales.
- It does not survive gifts. Timberland gifted during the owner's lifetime generally keeps the original (low) basis instead of stepping up.
The takeaway
Stepped-up basis is the rare provision in the tax code that quietly favors patient, long-holding families. Capturing it requires three things in the months after death: a measured timber cruise, a defensible date-of-death valuation that separates land and timber, and a CPA who knows what to do with both numbers. Skip any of the three and the family pays for it later — often many times over.
If you're an executor or new heir to timberland in Mississippi or Alabama, talk to a registered forester early. The appraisal window doesn't stay open forever.