Prepare Your Basis Records Before a Buyer Arrives

Basis is a record, not a guess

Owners often know what they originally paid but cannot reconcile later changes. Asset basis and ownership-interest basis are separate records. A company can own assets with one tax basis while the shareholder or partner has a different basis in the interest being sold. The transaction determines which record matters.

A balance-sheet equity account is useful evidence but should not be treated as a complete tax-basis calculation. Historical contributions, distributions, income, losses, ownership transfers, and debt arrangements need reconciliation under the rules applicable to the entity.

Build a historical chain

Collect acquisition agreements, canceled checks or wire confirmations, prior returns, depreciation schedules, contribution records, and distribution ledgers. For an acquired business, locate the purchase allocation and closing statement. For gifts, inheritances, reorganizations, or prior restructurings, retain the documents explaining how basis was determined.

Organize a year-by-year schedule with links to supporting documents. Mark gaps explicitly. It is better to identify an unsupported figure before marketing the business than to represent it as certain in a buyer model. Ask the preparer how unresolved items affect the projection.

A clearly hypothetical discrepancy

An owner remembers investing $200,000 at formation and later advancing $300,000. The bookkeeper recorded the advance as a payable. That does not establish that the owner has $500,000 of equity basis or that the payable receives the same treatment as the ownership interest. The advisor needs the note, payment history, entity classification, and returns.

Separately, a machine purchased for $100,000 may have a much lower adjusted basis after depreciation. A sale-price allocation to that machine cannot be modeled using its original cost alone. The owner and company records must remain distinct.

Reconcile before using the number

Have a tax professional reconcile the schedule to filed returns and explain corrections or missing information. If a prior return appears wrong, determine whether a return amendment, accounting-method procedure, or another response is appropriate; do not simply overwrite the current schedule.

Store both the completed schedule and the underlying records in a durable exit folder. Review the schedule annually and after any ownership change. This work does not create a deduction. It helps prevent a sale projection from being built on a number nobody can substantiate.

Work through the difficult historical items

Acquisitions paid in several stages need particular care. The original price may have been adjusted by working capital, later earnouts, indemnity settlements, or assumed liabilities. Collect the final version of the price allocation, not only the first closing statement. Identify whether subsequent payments were incorporated into the asset or ownership basis schedule. If records are unavailable, write down what is known and what independent evidence could help support reconstruction.

Distributions deserve a complete review. A shareholder may remember only cash withdrawals while the company paid personal expenses, transferred property, or offset an amount against an advance. Partners may have liability changes that do not look like cash movements. The tax professional should identify how the relevant rules apply. The objective is to reconcile the actual history, not to increase basis by selecting only favorable entries.

Consider a hypothetical acquired asset with original basis of $250,000, later improvements of $40,000, and depreciation adjustments of $180,000. The arithmetic points to a $110,000 adjusted figure before other applicable changes. A spreadsheet that still shows the original $250,000 could materially distort a sale estimate. This is why the schedule must connect each adjustment to a record and distinguish original cost from adjusted basis.

Create a signed-off opening balance for the next planning year. Keep a separate column for disputed or provisional amounts and describe their potential impact. If ownership changes again, pass the whole record chain to the next preparer. A basis schedule should not become an isolated number copied indefinitely from one workbook to another. Its value comes from being reproducible and consistent with the taxpayer’s history.

Additional decision checks

Include debt and equity changes from the most recent year rather than stopping at the last filed return. A transaction often closes before the current-year return exists. Interim contributions, distributions, losses, and liability changes may therefore need a supported estimate followed by a final reconciliation. Mark that estimate clearly in the sale model so nobody mistakes it for a completed historical calculation.