Basis as a running story with chapters the schedule cannot see
Basis is one of the two numbers in every taxable sale — gain or loss is the sale price minus the basis — and it is the harder of the two to know. The sale price is a fact of the transaction. The basis is the accumulated record of everything that happened to the asset from the moment it was acquired. The Internal Revenue Code defines basis as cost (§1012), then lists dozens of adjustments (§1016) that raise it — improvements, acquisition fees — or lower it — depreciation, casualty losses — over the asset’s life.
But the code also resets basis entirely at certain moments. An asset inherited at death takes a new basis equal to its fair market value then (§1014, the “step-up”), wiping out the prior owner’s whole accumulated history. An asset received as a gift carries over the donor’s basis (§1015). So basis is not a static figure; it is a running story, assembled across the entire holding period and occasionally rewritten by a single determined event. The running adjustments are mechanical and squarely the offshore team’s work. But the story’s beginning, and the events that reset it, are tax determinations that live outside the asset’s own records — and a perfectly kept schedule can be tracking the wrong story if an event the records never saw has already replaced it.
What is cost basis?
Cost basis is the value of an asset for tax purposes — generally its acquisition cost, adjusted over time for improvements that raise it and depreciation that lowers it — subtracted from the sale price to compute taxable gain or loss. Its starting point, and resets such as the step-up at death, are tax determinations set by how the asset was acquired, not by the running cost record.
How basis works and how it is adjusted
The role. Gain or loss = amount realized − adjusted basis. Basis is the variable that must be assembled rather than observed, and it determines how much of a sale price is taxable.
Adjusted basis (§1016). Begin with cost and adjust: capital improvements and acquisition fees raise it; depreciation deductions and casualty losses lower it. For securities, start with purchase price plus commissions, then adjust for stock splits, reinvested dividends, and return-of-capital distributions, tracking lots by FIFO or specific identification.
Origination by acquisition method. The starting basis depends on how the asset was acquired:
- Purchased: cost (§1012)
- Inherited: stepped up (or down) to fair market value at date of death (§1014) — income in respect of a decedent is excluded ⚠️ confirm step-up remains in effect at publish
- Gifted: carryover basis from the donor (§1015), with a dual-basis rule for losses and the donor’s holding period tacked on
- Like-kind exchange: substituted basis from the relinquished property (§1031)
- Equity compensation: special basis rules by compensation type
Documentation. If original records are missing, the IRS can assert a basis of zero — making the entire sale price taxable. Substantiation is part of basis, not an afterthought.
Characterization. Whether an expenditure is a basis-raising capital improvement or a non-adjusting repair is a tax characterization, not an automatic entry. Large expenditures on long-held assets must be characterized, not assumed.
Key IRC sections
| Section | Rule | Notes |
|---|---|---|
| §1012 | Basis of property is its cost | The starting point for purchased assets |
| §1016 | Adjustments to basis | Improvements and fees up; depreciation and casualty losses down |
| §1014 | Inherited property stepped up to FMV at death | ⚠️ Confirm remains in effect at publish — perennially subject to repeal proposals |
| §1015 | Gifted property carries over donor’s basis | Dual-basis rule for losses; donor’s holding period tacks on |
| §1031 | Like-kind exchange substitutes basis from relinquished property | Basis carries over rather than resetting to new cost |
| Wash sale | Disallowed loss added to basis of replacement security | A basis adjustment triggered by a trading pattern, not a cost |
Where careful basis tracking matters most
| Context | Why cost basis is critical |
|---|---|
| Real estate | Long holding periods accumulate improvements and depreciation; recapture on sale; step-up at inheritance |
| Estates and inheritances | The step-up to FMV at death can eliminate decades of embedded gain — but must be established and documented |
| Securities investors | Splits, reinvested dividends, and lot tracking across years and brokers |
| Business owners | Equity compensation basis rules and business-asset depreciation schedules |
| Anyone with long-held appreciated assets | Decades of adjustments behind a single sale; missing records default to zero basis |
How CPA firms work with cost basis
For a firm, cost basis is a maintained schedule built on determinations. The firm establishes the origination — the starting basis by acquisition method, including the step-up at death and carryover for gifts. It characterizes expenditures as capital improvements or repairs. It handles resets and depreciation recapture. It maintains or reconstructs defensible records, because the IRS can assert a zero basis when records are absent, making the entire sale price taxable. The split: the origination, characterization, and reset determinations are the firm’s; maintaining and documenting the running schedule is execution.
Cost basis and offshore accounting
Cost basis keeps a promise the capital gains term made — that basis is a story, not a number — and it reprises a warning the NOL term sounded: a perfectly maintained ledger can be tracking the wrong story if a determined event the records never saw has already changed it.
The offshore team’s part in this story is large and genuinely protective. Basis is a running figure maintained across the entire holding period — the acquisition cost and fees at the start, then every capital improvement added, every year of depreciation subtracted, every stock split and reinvested dividend folded in, for as long as the asset is held. Maintaining that schedule meticulously, year after year, is exactly the offshore team’s strength. And documenting it is too. Because the tax code’s penalty for missing basis records is severe — the IRS can assert a basis of zero and tax the entire sale price — the disciplined, well-documented basis schedule the offshore team keeps is precisely what protects the client from that outcome. This is not a low-value chore; it is the thing standing between the client and a fully taxable sale.
But a running schedule, however perfect, answers only one of the two questions basis poses: “what has happened to this asset since we started tracking it?” It cannot answer “what was the basis when tracking began, and has anything reset it since?” — because the answers live outside the asset’s own transaction records. The starting basis is set by how the asset was acquired: a purchased asset starts at cost, but an inherited one starts at fair market value on the date of death, and a gifted one carries over the donor’s basis. And basis can be reset mid-story by a determined event — most powerfully, the step-up at death, which replaces the prior owner’s entire accumulated basis with a single fair-market-value figure the moment that owner dies. None of that is in the asset’s records.
The characteristic failure mode is maintaining the basis schedule mechanically while blind to the origination and reset events that determine what basis is even being tracked. It takes three forms: assuming the starting basis is cost when the asset was inherited or gifted (treating an inherited asset as if its basis were the decedent’s purchase price, when the law stepped it up to fair market value at death); characterizing an expenditure as a capital improvement without a tax determination; and — the sharpest — maintaining a flawless multi-year schedule of a decedent’s cost and improvements that the step-up at death already discarded. A perfectly continuous schedule tracking a number the code replaced the moment the prior owner died is not a correct basis schedule; it is a correct record of the wrong number.
The offshore team maintains the basis schedule and documents it defensibly — that is real protection for the client. What it must not do is assume the starting basis is cost: the acquisition method — purchased, inherited, gifted, exchanged — must be established as a confirmed fact before the schedule means anything. It must not characterize improvement-versus-repair adjustments without the firm’s determination. And it must not carry a basis forward through events — a death, a gift, an exchange — that may have reset it. It is a sensor: when anything suggests a reset — an asset that came by inheritance or gift, a prior owner’s death, a like-kind exchange — it flags it: “this basis may have been reset by this event; the correct starting or current basis is a tax determination, not the running cost we have tracked.” The continuity is the offshore team’s to keep; the origination and the resets are determinations the firm must establish.
What are the common misconceptions about cost basis?
- “Cost basis is just what you paid for the asset.” Only when you bought it. An inherited asset’s basis is its value at the prior owner’s death, not what they paid, and a gifted asset carries the donor’s basis. The starting point depends on acquisition method.
- “Once you know the basis, it does not change.” It changes throughout the holding period — improvements raise it, depreciation lowers it — and certain events reset it entirely, like the step-up at death.
- “A perfectly kept basis schedule is the correct basis.” Not necessarily. If the asset was inherited, the law replaced the prior owner’s entire tracked basis with its value at death, so a meticulously maintained schedule of the decedent’s cost can be tracking a number the code already discarded.
- “Every cost spent on an asset adds to basis.” No. Capital improvements add to basis, but ordinary repairs and maintenance do not. The distinction is a tax characterization, not automatic.
- “If we do not have records, we will just estimate.” The IRS can assert a basis of zero when records are missing, making the entire sale price taxable. Reconstructing basis requires credible documentation plus expert support.
What terms are commonly confused with cost basis?
| Confused with | The key difference |
|---|---|
| Capital Gains | The gain or loss computed by subtracting basis from the sale price; basis is what is subtracted, the gain is the result |
| Net Operating Loss | Like a basis schedule, an NOL balance can be perfectly maintained yet wrong if an event the records did not see has reset or limited it |
| Depreciation | An adjustment that lowers basis over time and creates recapture on sale; basis is the running figure that depreciation reduces |
| Fair Market Value | What basis is reset to at death (§1014); basis is the tax figure, FMV the yardstick used at certain determined events |
Common client questions about cost basis
What is the cost basis of an asset we are selling?
It starts with how you acquired it. If you bought it, it is your cost plus improvements minus depreciation. If you inherited it, the basis is generally its value on the date the previous owner died — not what they paid — and if it was a gift, it usually carries over the giver’s basis. So the first question is always how the asset came to you, because that determines the starting basis. Only then do we layer on the adjustments. We maintain and document all of that, but the acquisition method is a tax determination the firm confirms.
We have tracked every improvement and depreciation entry for years — is not that the basis?
That running record is exactly what we maintain, and it is valuable — but it is only the right basis if the starting point was right. If the asset was inherited at some point, the law reset the basis to its value at the prior owner’s death and wiped out everything before it, so a perfectly kept schedule of the original owner’s cost can be tracking a figure the code already replaced. We keep the schedule meticulously and flag any inheritance, gift, or exchange that may have reset it.
We inherited this property — do we use what the deceased paid for it?
Generally no. Inherited property usually gets a stepped-up basis equal to its fair market value on the date of death, which often erases the gain that built up during the previous owner’s lifetime. That is a significant tax benefit, but it is a determination tied to the death and the estate — the value at death has to be established and documented — so it is set with the firm rather than read off the old purchase records.
We cannot find the original purchase records — what now?
That is a real risk, because without support the IRS can treat the basis as zero and tax the entire sale price. Reconstructing basis is possible but needs credible documentation — old statements, closing records, improvement receipts — and expert support. It is worth gathering everything you can rather than estimating, and we can help organize and substantiate what exists.
Do repairs we made add to the basis?
Capital improvements do — things that add value or extend the asset’s useful life — but ordinary repairs and maintenance generally do not. The line between a capital improvement and a repair is a tax characterization, so we flag the larger expenditures for the firm to characterize rather than assuming every cost adds to basis.
