A loss balance needs a tax identity
An owner coming out of a difficult year may remember a large loss and assume that next year's profit will produce no income tax. First establish what the loss actually is. A bookkeeping loss, a suspended pass-through loss, a capital-loss carryforward, and an individual net operating loss are different items. They do not share one universal rule for use. Ask the preparer to identify each balance, the taxpayer who owns it, the year it arose, and the rule that controls its availability.
Separate the company's records from the owner's return. The IRS Form 172 instructions explain that partners and S corporation shareholders can use their separate shares of business income and deductions in figuring their individual net operating losses; the partnership or S corporation generally does not use an NOL itself. The company accountant's loss figure therefore does not establish the owner's personal NOL carryforward. Other income, deductions, and owner-level limitations need to be considered in the appropriate calculation.
A hypothetical limitation in a recovery year
Assume an individual has a verified $200,000 NOL carryforward entirely from years after 2017 and no NOLs from earlier years. Assume the relevant taxable-income base, computed under the applicable NOL limitation rules, is $100,000. Under the general 80% limitation described in the Form 172 instructions, the current deduction in this simplified example is limited to $80,000, leaving $20,000 before other applicable calculations. The fact that the carryforward exceeds $100,000 does not by itself reduce that income base to zero.
This is deliberately narrower than a full owner-return calculation. It assumes the $200,000 has already been correctly established and does not resolve state treatment, special loss categories, business-loss limitations, or other deduction interactions. The remaining carryforward must be computed using the proper workpapers. Ask the preparer to show the actual loss utilized, the remaining balance, and the resulting tax projection rather than applying an informal percentage to the company's profit.
Recover the history before the next payment
Request the original loss-year return, supporting calculation, and every intervening utilization schedule. Reconcile the opening balance with the prior preparer's closing balance. If a return was amended or an agency adjustment changed the loss, include that change. A spreadsheet cell carried forward for several years is not enough when the underlying source file cannot be found. Record unresolved differences explicitly and decide how they affect the current payment recommendation.
Keep each loss type on its own schedule. For a suspended pass-through loss, ask which limitation caused the suspension and what events could change its availability. A contribution, repayment, distribution, sale, or change in participation should be evaluated under the relevant rules; none should be assumed to release every loss. For an NOL, retain its year of origin and the applicable utilization rules. State carryforwards require their own review rather than automatically copying the federal amount.
Put verified utilization into the forecast
Have the advisor prepare a forecast with the verified loss balances and a second case excluding any disputed amount. Compare the projected total tax, required payments, and year-end balance in both cases. This distinguishes a real planning benefit from an unsupported assumption. The owner should know whether the proposed lower estimate relies on a settled calculation or on records someone is still attempting to reconstruct.
Do not let a lower projected tax payment disappear into the operating budget without a decision. The business may need to rebuild liquidity after the loss year, pay deferred obligations, or fund a later tax bill when carryforwards are exhausted. Map the expected use of losses over several profit scenarios. An owner who sees only this year's deduction can underestimate the cash needed in the first year when that balance no longer provides a benefit.
Close the loop after filing
At filing, obtain a final carryforward package showing the opening balance, current-year additions, current-year utilization, adjustments, and closing balance for each relevant category. Confirm which schedules belong to the entity and which belong to individual owners. Store the workpapers with the returns that support them and preserve them for the applicable retention period. A change of preparer should include this package as a specific handoff item.
If the recovery year differs sharply from the forecast, update the next year's reserve before distributing excess cash. A strong fourth quarter could consume more of a usable loss than expected, while a weaker year could leave more available. The practical outcome is a verified tax asset with a traceable history and a realistic payment plan. Remembering that the business once lost money is the beginning of the inquiry, not the answer to what the owner owes now.
Sources & further reading
Consult the original guidance and its effective dates. These references support the educational discussion; their application depends on the specific facts.