A rental loss that IRC §469 disallowed in an earlier year is suspended, not lost. It carries forward, stays attached to the activity that produced it, and waits for something to release it. Generally two things do: income the loss can be netted against, or a fully taxable disposition of the entire interest in that activity. A change in how the property is treated this year does considerably less than most owners expect.
What follows is the mechanical shape of the rules, not a reading of any particular return. Carryforwards sit at the intersection of several code sections, and how they apply turns on facts — ownership, grouping, basis, what was reported in each earlier year — that only the person holding the file can see.
Where a suspended loss actually lives
Suspended losses are not a line item you can glance at. Under §469(b), a loss disallowed in one year is treated as a deduction allocable to the same activity in the following year, and the amount rides forward on the Form 8582 worksheets rather than on the face of the return. IRS Publication 925 walks through those worksheets and the per-activity allocation that sits behind them.
Two practical consequences follow. First, the carryforward is tracked activity by activity, so which property generated which loss matters. Second, the number is only as good as the worksheets behind it. An owner who changed preparers partway through, or who filed the first couple of years without a schedule of unallowed amounts, often cannot say what the carryforward is without rebuilding it.
Why the loss suspended in the first place
A rental activity is generally passive under §469 regardless of how much work the owner does. The exception short-term rental owners rely on is definitional: Treas. Reg. §1.469-1T(e)(3) excludes from "rental activity" property with an average period of customer use of seven days or less, and property with an average of 30 days or less where significant personal services are provided. A property outside the rental definition is not automatically non-passive — it still has to clear one of the material participation tests in Treas. Reg. §1.469-5T.
So a suspended loss usually traces to one of three facts in that earlier year: the average stay was too long, the hours fell short of whichever test applied, or the hours were worked but never recorded in a form anyone could read. The third is the one owners discover late, and it is the one the record-keeping habit addresses.
Release by income the loss can offset
The ordinary route is unglamorous. Suspended passive losses are netted against passive income in the Form 8582 computation, and that netting is not limited to the activity that produced the loss — passive income from one activity can absorb carryforward from another. A property that turns profitable, or a second passive activity with income, pulls the carryforward down year by year without anything special happening.
For many owners this is slow, which is why the disposition rule gets the attention.
Release on a fully taxable disposition
Section 469(g) describes the other route: when a taxpayer disposes of an entire interest in a passive activity in a fully taxable transaction to an unrelated party, the suspended losses from that activity are generally allowed and are no longer treated as passive.
Each term in that sentence carries weight. "Entire interest" excludes selling one of two properties that were grouped as a single activity. "Fully taxable" excludes a like-kind exchange and complicates an installment sale. "Unrelated party" excludes a sale to a family member or a controlled entity. A gift is not a disposition that releases the loss. None of that is something to work out from an article — it is the short list of questions to put in front of a CPA or EA well before a sale closes, because the structure of the sale is what decides the answer.
What a non-passive year does, and does not do
This is where the common misunderstanding sits. Suppose a property was passive in 2024 and 2025, suspending losses, and in 2026 the average stay is under seven days and a material participation test is met. The 2026 loss may be non-passive. The suspended 2024 and 2025 losses do not come along with it.
Section 469(f) treats the activity in that situation as a former passive activity: carryforward from the earlier years is allowed against income from that same activity for the year, and any excess continues to be treated as a passive loss carried forward. The 2026 hours do not reach back and free the 2024 loss against 2026 wages. What this year's hours govern is this year's loss, which is the subject of how STR losses offset W-2 income.
Why prior-year logs still matter
A carryforward is claimed in the year it is used, and that is the year in which it can be questioned — even if the year that generated it is long closed for assessment. The support for the amount lives in the earlier years: how the activity was characterised, how activities were grouped, what the average stay was, and what the hours were.
That makes old logs part of a live file rather than history. If you keep hours in STR Tracker, the export accepts a custom date range, so a closed year's entries come out as a dated PDF or Excel file on their own rather than being dug out of a current-year view. However the record is kept, the test is the same: a reader who was not there should be able to follow it.
What to keep for a closed year
For each year that contributed to a carryforward, the file generally wants:
- the hours log, by person and by property, with dates and task detail
- the average-stay evidence for that year, from the booking platform
- the return as filed, with the Form 8582 worksheets showing unallowed amounts
- receipts, invoices or photographs tied to a sample of log entries
- the names and hours of everyone else who worked on the property
Those last two are the ones that decay. Receipts go missing and cleaners change companies, so the corroboration for a 2024 entry is easier to collect in 2024 than in 2029.
Before amending anything
Whether an earlier year was reported correctly, and whether to amend it, is squarely a question for a credentialed adviser. It involves the statute of limitations, the consistency of positions across years, and the knock-on effect on every later return — and an amended year that reverses a characterisation invites a look at the records for that year.
The useful preparation is to arrive with the facts assembled rather than the conclusion: the carryforward schedule, the hours for each year, the average stay for each year, and a plain statement of what was and was not recorded at the time. Background on where the definitional test and the participation test each fit is in the short-term rental loophole guide, and if the current year's hours are the part that is not yet being captured, that is the piece to start now rather than reconstruct later.