The depreciation deduction on a business return comes from a schedule that lives outside the trial balance. It is computed in the tax software's asset module, or in a spreadsheet, or in a fixed asset package that talks to neither.
Nobody reconciles it back. It works fine for years, right up until a client sells a building and somebody discovers the asset was disposed of in the books in 2023 and has been depreciating on the schedule ever since.
The reconciliation takes ten minutes. Here is what it is.
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First, the number that is supposed to disagree
Form 4562 line 22 is total depreciation and amortization for the year. It carries to the depreciation line of whichever return you are filing.
Line 22 is a tax number. Depreciation expense in the client's general ledger is a book number. They are computed under different systems and they will not match, in any year, on any return.
That gap is the Schedule M-1 adjustment and it is entirely normal. We covered which direction it runs in book vs tax depreciation. Nothing in this article is about making those two figures agree, because they should not.
What should tie is everything else.
The two rollforwards
Every fixed asset reconciliation is two rollforwards with four numbers each.
Cost. Beginning cost per the trial balance, plus additions, less disposals at original cost, equals ending cost per the trial balance.
Accumulated depreciation. Beginning accumulated depreciation per the trial balance, plus current year book depreciation, less accumulated depreciation removed on disposals, equals ending accumulated depreciation per the trial balance.
The test is not that these internally balance. They will, because the ledger balances. The test is that the additions and disposals in the ledger equal the additions and disposals on the depreciation schedule.
That is the whole reconciliation, and the moment it fails you have found a real error rather than a rounding difference.
What sits on the form
Form 4562 is organised by how the deduction was claimed rather than by asset.
Part I handles the section 179 election. Part II is the special depreciation allowance. Part III is MACRS, split between assets placed in service in prior years and assets placed in service this year. Part V covers listed property, which is where vehicles and their business use percentages go. Part VI is amortization, which is a separate calculation for intangibles that people forget is on the same form.
That structure is useful for one specific check: Part III Section B lists the assets placed in service during the year with their bases. Add those, add anything expensed under section 179 in Part I, add anything taking bonus in Part II, and the total should equal the additions to the fixed asset accounts in the trial balance.
If it does not, one of the two records is wrong, and you now know which year to look in.
The four ways it breaks
An asset expensed in the books and capitalised on the schedule. A 6,400 piece of equipment gets coded to Repairs and Maintenance by the bookkeeper because that is what the invoice looked like. The preparer adds it to the depreciation schedule because they saw it in the detail. The deduction is now taken twice: once as a repair, once as depreciation. Both records look internally consistent. Only the reconciliation catches it.
The reverse. The client capitalises something under their own policy, the schedule never receives it, and an asset sits on the balance sheet accumulating no depreciation at all. This one is quieter and can persist for a decade.
A disposal that only happened in one place. The asset is written off the books when it is scrapped, and stays on the depreciation schedule generating a deduction for equipment that no longer exists. Or it comes off the schedule and stays on the balance sheet at full cost. Either way, Schedule L is wrong and so is the deduction.
Amortization with no matching intangible. Part VI is amortizing loan costs or a covenant not to compete, and there is no corresponding intangible asset in the trial balance because the original entry expensed it. This is the most commonly missed of the four, because amortization is small and lives at the bottom of a form everyone has stopped reading by then.
The de minimis policy makes this worse
Most small clients now expense assets below a threshold under a capitalisation policy. That is fine and it is deliberate.
The problem is that the policy is applied by the bookkeeper and the depreciation schedule is maintained by the preparer, and the threshold in each person's head is not always the same number. One year a 2,500 laptop is expensed, the following year an identical one is capitalised because a different person touched it.
Neither treatment is wrong. The inconsistency is what makes the fixed asset accounts stop rolling forward, and it is the reason the reconciliation has to be done annually rather than once when the client is onboarded.
Where Ledger IQ fits
The reason this reconciliation does not get done is that the two records live in different tools and nobody owns the comparison.
In Ledger IQ the trial balance side of it is on screen. You upload the client's trial balance, the fixed asset and accumulated depreciation accounts are mapped to their Schedule L lines, and the Working Trial Balance shows the unadjusted balance, every entry that touched it, and the adjusted balance. Click any adjusted figure and you get the build-up, which is the ledger half of the rollforward without assembling it by hand.
Because the tax software computes depreciation from its own asset module, Ledger IQ deliberately marks depreciation and fixed asset lines as not exported. They appear in your workpaper so the totals tie and so the reconciliation is documented, and they stay out of the import file so they cannot fight the asset module or double up. That distinction is the whole point: the workpaper needs the numbers, the import file must not carry them.
Then the return tie-out closes the loop. Once the return is populated, key the as-filed Schedule L figures back against the workpaper and Ledger IQ flags any line that disagrees. Accumulated depreciation that does not match is exactly the symptom of a disposal handled in one record and not the other, and it surfaces before the return goes out rather than when the asset is finally sold.
Ledger IQ supports Forms 1065, 1120S and 1120, with exports for Drake, Lacerte and UltraTax CS. It is free during early access, so you can try it at portal.ledgeriq.ai on a live client without a credit card.