the appreciation protocol

If you own rental property in the United States, you know the number: 27.5 years. That's how long the IRS says a residential building takes to "wear out." Every year you deduct a fraction of the building's cost from your taxable income. You pay less tax. The building still stands.

Depreciation is one of the most valuable tools in American real estate. Cost segregation studies accelerate it. Bonus depreciation front-loads it. 1031 exchanges defer what the IRS would otherwise claw back. Entire portfolios are structured around it.

Now the concession, because it's the first thing any accountant will say and they're right: depreciation is cost recovery, not a handout. You are deducting money you actually spent, spread across the years the asset earns. And the code takes it back — sell the building and Section 1250 recapture taxes the depreciation you claimed, at rates up to 25%.

So the subsidy isn't the deduction. It's the acceleration, and the exit.

Deductions taken faster than an asset actually wears out are an interest-free loan from the Treasury, and in present-value terms that loan is worth real money. Cost segregation exists to speed it up. Bonus depreciation compresses it into year one. A 1031 exchange rolls the recapture into the next building, and the next. Hold until death and your heirs take a stepped-up basis — at which point the recapture isn't deferred, it's gone.

Strip the machinery and the incentive underneath reads plainly: the system pays you, in present-value tax savings, for booking the decline of your asset — and pays you most when you book it fastest.

That's not a bug. That's the confession.

one word, one root, six children

The word depreciate comes from Latin depretiare — "to lower the price of." Its components: de- ("down") + pretium ("price, value, reward, worth").

The word appreciate comes from the same root: ad- ("toward") + pretium. Same ancestor. Opposite prefix. One lowers value. The other raises it.

Six English words descend from pretium:

Price, praise, precious, appraise — a whole family of English words for recognizing worth, all descended from one root. Depreciate is the word for lowering it. Appreciate is the word for raising it.

Etymology is not evidence. A shared Latin root proves nothing about forests, and nothing that follows rests on it. Treat it as bookkeeping: English kept both directions, and finance industrialized exactly one of them.

a brief history of getting paid to degrade

Depreciation is not a law of nature. It's an accounting convention that became a U.S. tax instrument in 1909 and has been rewritten roughly once a decade since.

The usual version of this story says every amendment made deductions faster. That's too clean, and the exception is instructive.

The Tax Reform Act of 1986 ran the other way. It stretched residential real estate from 19 years to 27.5, forced straight-line, and added passive loss rules built specifically to kill the tax-shelter trade that accelerated depreciation had created. 1993 pushed commercial property to 39 years. Writing in 1987, Follain, Hendershott and Ling put it flatly: the 1986 act "more than reverses" the 1981 one — tax depreciation less generous than before 1981, capital gains rates higher than before 1978, and new passive loss provisions aimed squarely at real estate.

Then the ratchet resumed, and this time it didn't stop. Bonus depreciation arrived in 2002, expanded repeatedly, reached 100% under the 2017 Tax Cuts and Jobs Act, and was scheduled to phase back down to zero by 2027. It never got there. In July 2025, the One Big Beautiful Bill Act repealed the phase-down and made 100% first-year expensing permanent for qualified property acquired after January 19, 2025. It went further: a new Section 168(n) lets certain factory buildings — real property that would otherwise depreciate over 39 years — be written off entirely in year one.

One genuine reversal, reversed back across three decades, ending in permanence.

Tax Foundation states the underlying logic plainly, and without embarrassment:

"How capital assets are accounted for in the tax code dramatically affects what is defined as taxable income and, thereby, directly influences the cost of capital. The higher the cost, the less capital is formed, and the slower the economy will grow."

They are not wrong, and that is the point. It works. Faster write-offs lower the cost of capital, and more capital gets formed. The question here is narrower: what happens when the same machinery is aimed at assets nobody can rebuild?

the manufacturing bias: why depreciation fails for natural capital

Depreciation was designed for machines. Its logic assumes:

• Assets are reproducible — you can build another one
• Decline is predictable — engineering schedules say when parts fail
• Replacement is possible — swap old for new
• Value loss is gradual — linear or exponential, never sudden
• Assets are substitutable — a newer model does the same job

This works beautifully for factories, trucks, computers, and HVAC systems. It breaks for living systems:

Alastair McIntosh named this in 1995: the "presumption of symmetrical depreciation" — the assumption that natural and human-made capital decline in the same way, at comparable rates — is what makes the two look substitutable in the first place. Remove the presumption and the substitution stops being rational.

He was writing into a much older argument, and it's worth naming honestly rather than claiming novelty. Herman Daly, David Pearce, and Robert Costanza had spent years making the case for "strong sustainability" — that natural capital has no general substitute — against a neoclassical position associated with Robert Solow, in which capital is broadly fungible over the long run. That debate is decades old and not settled. What has changed is that the empirical side of it keeps getting harder to argue with.

A machine depreciates toward zero and you buy a replacement. A forest pushed past a threshold has no replacement available at any price. The depreciation schedule projects a gradual march toward salvage value. Ecological collapse is a cliff.

the land exception: why land cannot be depreciated

Land cannot be depreciated. Bedrock IRS rule, and the rationale is exactly what you'd expect: land has an indefinite useful life. It does not wear out or become obsolete.

Buy a $1 million rental property and you allocate — say $200,000 to land, $800,000 to the building. Only the building generates deductions. The land sits there, assumed permanent.

The exception carries a buried radical premise: some things should not lose value through use.

But the code is not silent about what sits on the land, and this is where the argument usually gets sloppy. There is a whole parallel regime for that: depletion.

Under Section 611, owners of mines, oil and gas wells, other natural deposits, and timber deduct the using-up of the resource itself. Standing timber uses cost depletion — you recover your basis as you cut. Minerals, oil, and gas can use percentage depletion under Section 613, a fixed share of gross income that, over a property's life, can exceed what the owner originally paid. And Section 631 lets a timber owner elect to treat cutting as a sale, converting what would be ordinary income into long-term capital gain.

The forest is not invisible to the tax code. It is visible as inventory. There is a deduction for removing it and a preferential rate on the proceeds.

Which makes the real asymmetry sharper than "the code ignores nature":

The code has a number for the forest as logs and no number for the forest as a forest. Standing timber is an asset with a basis. The moisture that forest returns to the air, which falls as rain downwind, is not.

And the category assumed permanent is precisely the one degrading fastest in practice. Forests cleared. Aquifers drawn down. Soils stripped of organic matter. Wetlands drained. The accounting assumes permanence; the ground shows otherwise. That gap is where value destruction happens with zero visibility on any balance sheet.

natural capital accounting is catching up — partly

National accounts made a version of the same error for most of a century, and are now quietly fixing part of it.

Under the 2008 System of National Accounts, net measures subtracted depreciation of produced capital but recorded the drawdown of natural resources as an "other change in the volume of assets" — a footnote, not a cost of doing business. Cutting a rainforest raised GDP through timber revenue. The forest's disappearance registered nowhere in the production account.

That changed. The 2025 System of National Accounts, adopted in March 2025, records depletion of natural resources as a cost of production, flowing through net domestic product and net national income, and identifies NDP as the conceptually preferred measure of economic growth alongside GDP. It is the treatment the UN's SEEA framework had recommended for over a decade.

Which is worth sitting with, because at first glance it looks like the opposite of this essay's argument. Robert Costanza and Partha Dasgupta pushed for exactly this outcome — Dasgupta's 2014 paper in Nature is titled, plainly, "Account for depreciation of natural capital." So: are we for depreciating nature or against it?

Both, and the distinction is the whole argument:

Accounting for degradation is honesty. Being paid for degradation is an incentive. We want the first, and should be careful about extending the second.

The 2025 fix is also partial. Depletion covers non-produced natural resources — the timber, the fish, the subsoil minerals. Ecosystem condition is a different thing: a watershed that still has all its trees but has lost its capacity to hold water, a soil that has lost its carbon, a pollinator network thinning out. That still lives in SEEA ecosystem accounting, outside the core accounts. The stock you can sell got a number. The functioning you can't got a satellite.

what living systems actually do

A machine degrades toward disorder. That is the Second Law of Thermodynamics doing its work — without energy input, entropy wins. Depreciation is entropy made financial.

Living systems do not escape the Second Law. They route around it locally, by importing energy and exporting entropy: a forest takes in solar radiation and sheds heat, and the order it builds in between is the value. Ilya Prigogine named these dissipative structures and took a Nobel Prize for the work in 1977.

The consequence that matters here is that a living system's trajectory is conditional, not automatic. Given favorable conditions and competent stewardship, a temperate forest accumulates biomass, builds soil, filters water, returns moisture to the air, and grows more structurally complex for decades or centuries. That is genuine appreciation, and no machine does it.

But the honest version has limits, and the limits matter more than the slogan:

• Growth rates plateau. Net primary productivity in an even-aged stand peaks and then declines. Old-growth forests can approach carbon-neutral at the ecosystem scale — holding enormous accumulated stock while adding little in net new.
• Not every ecosystem accumulates biomass. Grasslands, shrublands, and deserts store much of their carbon below ground and can be extraordinarily valuable while never "growing" the way a forest does. Appreciation is not the same as getting bigger.
• Trajectories reverse. Fire, drought, disease, pests, and land-use change can undo a century of accumulation in a season.

So the claim is not "nature always appreciates." It is the more useful one:

Which is precisely why the management is worth paying for. A machine's decline is a schedule you cannot negotiate. An ecosystem's trajectory is a variable you can move. Depreciation accounting assumes the first. Almost nothing in the tax code is built for the second.

depreciation schedules vs. ensured states

Conventional accounting projects an asset's decline toward zero book value. The depreciation schedule is a countdown, fixed at purchase.

Ensurance runs the other instrument. A certificate is tied to one specific natural asset and carries an ensured state — a written target condition that asset should hold or improve toward. Not a projection of decline. A commitment about condition, with funding attached.

Concretely, four parts:

1. A named asset. A specific place with boundaries, not a portfolio abstraction.
2. A stated ensured state. The condition being funded, in terms somebody can check — water retained, canopy held, soil carbon, species present.
3. A funding path. Buyers capitalize the work; proceeds route to the account responsible for that place.
4. A condition record. Measurement of whether the state is actually being held, published against the asset.

Now the part that decides whether any of this is real: measurement is the open problem. A depreciation schedule is trivially auditable because it is arithmetic agreed in advance — that is its entire appeal to a controller, and it's why an invented number like 27.5 years beats a true number that costs something to observe. Ecological condition is the reverse: real, and expensive to verify. Anyone offering frictionless nature accounting is selling the 27.5-year number again with better branding. The work is in the verification, and that is where this stands or falls.

The return isn't magic either. A certificate is not a claim on biomass. Value has to come from ordinary places: the underlying real asset, protocol activity routed to the account, and the avoided cost borne by whoever depends on that place — the utility that doesn't build the filtration plant, the insurer whose exposure falls, the operator whose corridor stays open. If none of those parties will pay, the instrument doesn't work. That is the correct test to hold it to, and it is the test we'd rather be judged on than a metaphor.

from deduction to compound

Two playbooks, same asset class, opposite direction.

The real estate depreciation playbook:

1. Buy the asset
2. Deduct its value over 27.5 years — faster with cost segregation, or immediately with bonus depreciation
3. Defer recapture through a 1031 exchange
4. Hold until death; the basis steps up and the recapture disappears

The ensurance playbook:

1. Fund a named natural asset through a certificate
2. Commit to an ensured state, and measure against it
3. Route proceeds to the account responsible for holding that condition
4. Value accrues to the extent the condition holds and someone downstream depends on it

One system pays for booking decline. The other pays for preventing it. The first is a century old, permanent as of 2025, and enormously effective at what it was designed to do. The second is early, harder to verify, and asks a question the first never had to answer: what happens to the assets that can go the other way?

The land exception already concedes the premise. Some things are not supposed to wear out. The tax code just stops at the dirt — and then, through depletion, pays for removing what grows on it.

Ensurance is one attempt at the opposite instrument. Not a deduction for consuming value, but a mechanism for funding and recording its increase.

De-pretium lowers value. Ad-pretium raises it. Same root, opposite direction — and so far only one of them has a schedule.

Next in this series: $1 now or $4 later — what deferred maintenance costs when the asset is a watershed.

the series

This is part of a series on the words we use to avoid funding what matters.

• there are no externalities — the unified argument
• there is no risk transfer — insurance's founding euphemism
• the appreciation protocol — depreciation and its inverse (you are here)
• $1 now or $4 later — deferred maintenance and nature's backlog
• price is what we pay — price, cost, and value as three separate decisions
• external to what? — the boundary buried in a word