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A little clarity for your next decision.
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Investor WorkspaceA little clarity for your next decision.
By Jerry Baker
Cost basis is the tax starting point for property you buy: its purchase cost plus certain costs of acquiring it. That starting amount changes as you make improvements, claim depreciation, or complete other transactions, so the number used to figure a later gain is usually your adjusted basis.
When I help someone compare real estate choices, I want their tax numbers and investment numbers to agree. A property can have a large loan, strong cash flow, and a very low tax basis at the same time. Each number answers a different question. This guide explains how to build a useful basis record and which items need your CPA’s attention.
Basis tracks an investment for tax purposes. It helps determine the gain or loss when you dispose of an asset. It also helps establish the amount you may recover through depreciation while you own it. Cost is the usual starting point for a purchase, but a gift, inheritance, or tax-deferred exchange can use different rules. [1]
Think of original cost basis as the first page of a running record. Adjusted basis is the balance after later changes. People often say “cost basis” when they mean that current balance. Before using a number, ask which version it is and the date it covers.
That small question can prevent a large error. An old closing statement might show a $600,000 purchase. The tax return might show a $410,000 adjusted basis after years of deductions and upgrades. Neither number needs to be wrong. They describe different points in the property’s tax history.
A basis file is also an evidence file. A figure copied from an old spreadsheet is useful only if you can explain how it was reached. Keep the closing statement, support for later work, and the depreciation records that connect the beginning to the current balance.
Suppose you buy a rental for $900,000, pay $300,000 in cash, and borrow $600,000. Ignoring other costs, your purchase basis is $900,000. It is not just the cash you paid. Borrowing helps fund the purchase; it does not remove the borrowed part from the property’s cost. The same general point applies when you assume a seller’s mortgage as part of a purchase. [1]
Now assume you pay down $80,000 of loan principal. Your debt falls to $520,000. Paying principal does not add that $80,000 to basis again. The full purchase cost was already counted. Mortgage interest follows its own tax rules and should not be confused with principal or with a capital improvement.
If the property rises in value to $1.2 million, that change does not by itself raise its tax basis. Your equity may have grown because both the value rose and the loan shrank. A current appraisal measures value; it is not a tax election to replace historical basis.
| Number | What it answers |
|---|---|
| Cost basis | What tax investment started with the purchase? |
| Adjusted basis | What is that tax investment after later changes? |
| Debt balance | What do you still owe the lender? |
| Market value | What might the asset sell for now? |
| Equity | What value remains after subtracting debt? |
These are related figures, but one cannot safely stand in for another. I would keep all five visible when planning a sale or exchange. That makes it easier to see why a large cash balance can come with a large tax bill.
The purchase price is only the beginning. Certain costs to acquire title can also be part of basis. IRS Publication 551 lists items such as title-search fees, recording fees, surveys, transfer taxes, and an owner’s title insurance policy. Legal costs for preparing purchase documents can qualify as well. The purpose of the expense matters. [1]
Do not add every line from the settlement statement. Loan origination costs, refinancing fees, and costs tied to obtaining financing generally do not become basis in the building or land. Some financing costs may be recovered separately over time. Prepaid insurance, escrow deposits, and operating costs also need their own treatment.
Property-tax adjustments need a closer look. A payment of the seller’s unpaid taxes, without reimbursement, may be treated differently from your own tax bill. A settlement credit may also change the calculation. Give your CPA the full statement rather than a single “closing costs” total.
For a simple example, assume the $900,000 purchase has $12,000 of properly capitalized acquisition costs. Initial basis would be $912,000. If another $8,000 on the closing statement consists of loan costs and escrow funding, you should not assume the property basis is $920,000. Those dollars still matter, but their tax categories differ.
Ask for a short schedule that assigns each settlement item to property basis, loan costs, current expenses, deposits, or another category. That schedule is more useful years later than a vague note saying “all closing costs included.”
A rental purchase often includes land and a building in one price. Land generally is not depreciable. The building generally is. The total cost must therefore be divided on a reasonable basis, usually using the relative fair market values of the parts when you acquired them. [2]
If a supported allocation assigns 25% of the $912,000 total to land, the land basis is $228,000. The other $684,000 goes to the building before any further asset breakdown. You cannot choose a low land value just because a larger building allocation would produce a larger deduction.
An appraisal can support the split. A property-tax assessment may also provide useful evidence in some circumstances, but an assessed value is not automatically the same as fair market value. Ask your tax professional whether the chosen method fits the property and is backed by records.
For residential rentals under the usual general depreciation system, buildings generally use a 27.5-year recovery period. Nonresidential real property generally uses 39 years. The date placed in service, applicable convention, ownership history, and other rules affect the actual deduction. These periods do not mean every dollar spent at closing is depreciated on the same schedule. [2]
A cost segregation study may identify assets with different recovery periods. That is a classification exercise, not a free increase in total cost. A faster deduction can also change the tax character of gain on sale. Have the study and its asset list retained with the basis records.
A new addition or major improvement can increase basis. Routine repairs may instead qualify as current expenses. The label on an invoice does not settle the question. The work performed and the tax rules determine whether you deduct the cost now or recover it over time. [1] [2]
Replacing a few damaged roof shingles is different from replacing an entire roof. A large project can also contain several parts with different treatment. Rather than deciding from the total bill alone, keep the contract, work description, dates, and proof of payment.
Suppose you add $48,000 of properly capitalized improvements to the rental. Before depreciation and other adjustments, basis rises from $912,000 to $960,000. If you instead spent $48,000 on deductible repairs, the same dollar total would not create the same basis increase.
You generally cannot count your own unpaid labor as part of the cost of building an asset. Materials and amounts paid to contractors may count under the relevant rules. The hours you spent painting or managing work are not turned into tax basis merely by assigning them an hourly rate. [1]
Insurance proceeds, casualty events, easements, credits, and other items may also affect basis. A history of major repairs after a fire needs more than the contractor’s final invoice. The tax treatment must account for the full event, including reimbursements and any claimed loss.
Depreciation lets you recover eligible property cost over time. It also generally reduces adjusted basis. This prevents you from deducting a cost during ownership and then counting the same cost again in full when you sell. [1]
Keep using the example with $960,000 of cost and capital improvements. If the total proper basis reduction for depreciation is $210,000, the simplified adjusted basis is $750,000. That does not mean the property is worth only $750,000. It means $750,000 remains in this tax measure.
A common mistake is assuming skipped deductions preserve basis. The rules generally require a reduction for depreciation allowed or allowable. In plain English, deductions you should have taken can still reduce basis even when you failed to claim them. Correcting past treatment may require amended returns or an accounting-method change, depending on the facts. [1]
Do not solve that problem by making up a catch-up deduction in the year of sale. Have the CPA review the full schedule. The right correction can depend on how many years were affected, what method was used, and whether the asset was properly placed in service.
Also ask for federal and state schedules when they differ. A state may not follow every federal depreciation rule. One asset can therefore have more than one valid adjusted basis for different returns.
In a simplified taxable sale, gain equals the amount realized minus adjusted basis. Selling expenses generally reduce the amount realized. Debt payoff affects the cash you receive, but you do not simply subtract the mortgage from sale proceeds and call the rest taxable gain. [3]
Assume the rental sells for $1.3 million with $65,000 in selling expenses. The simplified amount realized is $1,235,000. Subtract the $750,000 adjusted basis and the gain is $485,000.
If the lender receives $500,000 at closing, your cash after these items is $735,000. That cash figure differs from the $485,000 gain. Using the cash balance as the gain would overstate this example’s gain by $250,000.
The gain still must be classified. Depreciation-related amounts, business-property rules, holding periods, and other facts can affect the rate and character of tax. An accurate basis is necessary, but it does not by itself tell you the full tax bill. [3]
All amounts here are hypothetical. They leave out prorations, reserves, tax credits, suspended losses, and other possible adjustments. Their purpose is to show why the closing cash and taxable gain need separate calculations.
A qualifying like-kind exchange can defer eligible gain, but it generally does not give you a fresh tax basis equal to the full value of the replacement property. Deferred gain is reflected in the replacement basis. Form 8824 helps report the exchange and work through that calculation. [4]
In a very simple full exchange, assume an old property has a $500,000 basis and is exchanged for a replacement worth $800,000. With no extra cash, debt, expenses, or other adjustments, the replacement basis remains $500,000. The $300,000 built-in gain has been deferred, not erased.
Add $200,000 of your own cash for a $1 million replacement in that same stripped-down example, and basis becomes $700,000. Actual exchanges can be more complex because debt, cash received, recognized gain, and eligible costs affect the result. Do not use the simple example as a closing formula.
A qualifying DST interest does not change that basic point. The amount invested and the investor’s carried tax basis can be different. Each investor’s prior exchange history matters. The sponsor’s property purchase price cannot, by itself, tell your CPA your personal replacement basis.
Before choosing an investment for its expected tax shelter, ask how your own carryover basis will be allocated and depreciated. Two people can invest the same cash in the same property and have different tax results because they arrived with different histories.
Not every asset starts with what you personally paid. A gift generally carries the donor’s basis for figuring gain, subject to adjustments. If fair market value was lower than the donor’s basis at the gift date, a separate lower basis may apply when figuring a loss. [1]
That can create a middle range where a later sale produces neither gain nor loss. For example, ignore adjustments and assume donor basis is $200,000 while gift-date value is $150,000. A $175,000 sale falls between those amounts. The gain-basis and loss-basis rules need to be applied separately.
Inherited property generally starts with value at the date of death or another value allowed under the estate rules. Exceptions exist, and value can go down as well as up. A basis adjustment is not a promise that estate tax, future gain, or every other tax disappears. [1]
Converting your own home to a rental presents another two-number problem. The depreciation basis generally starts with the lower of adjusted basis or fair market value when rental use begins, with land excluded. A later sale can use different basis rules for gain and loss. [1]
Keep both the old purchase history and a supported value at conversion. A new rental agreement does not make the current appraisal the basis for every purpose. If a home fell in value before it became a rental, this distinction can be especially important.
I would organize the file so a new tax professional could follow it without guessing. Start with the original settlement statement and deed. Add the allocation between land, buildings, and other assets. Keep the reasoning and support for that allocation with the number.
Then maintain a dated list of additions and reductions. For each capital project, show the cost, work performed, placed-in-service date, and invoice location. Keep financing costs separate. Add each year’s depreciation schedule rather than only the amount on the final tax return.
For exchanged property, include the prior sale and purchase statements, Form 8824, and the calculation that moved basis into the replacement. For inherited or gifted property, keep the valuation and records supporting the applicable transfer rule. These are often harder to recover after several years.
Ask for a reconciliation before the property goes on the market. It should connect original basis to current adjusted basis and explain any missing years. That gives you time to correct records before a buyer sets a closing date.
If records are missing, begin with copies from the closing firm, lender, prior CPA, or contractors. Bank statements may prove payment but not the nature of the work. Rebuilding the file means finding support for both the amount and its proper category.
Keep important basis records while they remain relevant to calculating tax, including through later exchanges. The need does not always end when one property is sold. Carryover rules can make a much older document important to the basis of something you own today. [2]
Use clear file names with the property address, tax year, and type of document. Keep a separate note for unresolved items instead of quietly treating them as zero. An estimate used for early planning should stay marked as an estimate until the records support it.
Once those questions are answered, compare the taxable-sale case with the exchange case. Keep the tax savings separate from investment quality. A larger deduction does not repair a weak property or an unsuitable holding period.
My role is to help connect the investment choice to your needs and exchange requirements. Your CPA should confirm the tax basis and projected tax treatment. That division of work lets us discuss the actual dollars without pretending that a brochure can reconstruct years of tax history.
No. In a normal purchase, basis generally includes the full purchase cost, including the part funded with debt, plus eligible acquisition costs. The down payment is only the cash portion of that funding. Loan costs and escrow deposits may need separate treatment. [1]
Not simply because you repay principal. The debt-funded purchase cost was generally included when you bought the asset. Counting principal payments again would count the same purchase cost twice. Paying off debt still changes your cash and equity position.
Usually not for a property you bought and still own. An appraisal measures value. Basis follows tax rules and documented adjustments. An appraisal may matter for certain events, such as an inheritance or conversion to rental use, but those rules must be applied to the specific purpose. [1]
You may still have to reduce basis for depreciation you were entitled to claim. Ask your CPA how to correct the record and recover any permitted missed deductions. Do not assume the error leaves you with a higher basis on sale. [1]
No. A cost treated as a current repair expense generally is not also added to basis. Capital improvements generally increase basis and may be recovered over time. The work, applicable elections, and tax rules matter more than what the contractor calls the invoice. [2]
Generally no. Replacement basis carries forward deferred gain, with adjustments for additional investment, debt, recognized gain, and other items. Have your CPA calculate the result from the actual transaction. Your investment amount alone does not supply the answer. [4]
Gain compares amount realized with adjusted basis. Closing cash also reflects debt payoff and other cash items. Those are different calculations. Work through both before deciding how much money is available and what tax may be due. [3]
Educational information, not an offer or a personal tax, legal, or investment recommendation. Examples are hypothetical and omit stated adjustments. Tax treatment depends on your facts and current law. Review your transaction with your CPA, attorney, and qualified intermediary. Real estate investments can lose value and may be illiquid.
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