Common questions about S corporation depreciation in Lacerte

This article answers common questions about setting up and maintaining depreciation for S corporation (Form 1120-S) returns in Lacerte. It brings together guidance from multiple topics, including asset entry, vehicles, like-kind exchanges, installment sales, casualty/theft events, Section 179, start-up costs, and built-in gains tax.

Depreciation entries in Lacerte follow federal and state tax rules, but the software doesn’t replace your professional judgment. Always review current IRS instructions (such as Pub. 946 and Form 4562 instructions) to confirm recovery periods, methods, conventions, and limitations—including Section 179 and listed property rules.

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Overview of S corporation depreciation in Lacerte

For S corporations, most depreciation is entered on the Depreciation screen (S-Corp Screen 16). From there, Lacerte calculates regular and AMT depreciation, Section 179, and any special depreciation allowed, and flows amounts to Form 4562, the appropriate schedules (such as Schedule K and K-1), and, when applicable, Forms 4797, 6252, and 4684.

If you need step-by-step asset entry instructions across modules, see Entering a Depreciable Asset in Lacerte.

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Entering depreciable assets for S corporations

Setting up a new asset on the S-Corp Depreciation screen

1. Open the S corporation return and go to Screen 16, Depreciation.
2. Select or confirm the activity (for example, trade or business, rental, or other activity) so the asset flows to the correct line on the return.
3. In the asset list, add a new line and enter the basic information, such as:
   • Description of property.
   • Date placed in service.
   • Cost or other basis and business use percentage.
   • Method, life, and convention (for example, MACRS 200% DB, 5-year, half-year convention).
4. If the asset qualifies for Section 179 or special depreciation (bonus), complete the corresponding input fields in the same screen. See Section 179 Deduction Limited or Disallowed on S-Corporation Return for details on limitations.
5. Review the asset’s projected depreciation by viewing Form 4562 or the detail reports to confirm that the method, life, and convention match your expectations.

Editing, retiring, and disposing of existing assets

When an S-Corp disposes of, retires, or converts property to personal use, you’ll generally update the original asset record instead of creating a new one. This keeps depreciation history and prior Section 179 taken consistent for Forms 4562, 4797, and built-in gains calculations.

1. On Screen 16, Depreciation, highlight the existing asset.
2. Enter the date sold, retired, or disposed of, and, when applicable, the sales price, expenses of sale, and asset disposition code.
3. For partial dispositions or bulk sales, follow the approach in Partnership or S-Corporation Bulk Sale Missing Or Not generating On 4797 to ensure Form 4797 is generated as expected.
4. Review Form 4797, Schedule K, and the Schedules K-1 to confirm that ordinary gains, Section 1231 gains/losses, and depreciation recapture are correctly reported.

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Vehicles: standard mileage vs. actual expenses (1120-S)

S-Corp vehicle entries can use either the standard mileage rate or actual expenses with depreciation. The choice affects how depreciation is computed and how much detail you enter on the Depreciation screen. For a deeper discussion, see Common questions about the vehicle standard mileage rate vs. actual expenses (1120-S/1065).

Using the standard mileage rate

1. Enter vehicle information and business miles on the appropriate vehicle or auto input screen for the S-Corp.
2. Indicate that you’re using the standard mileage method for the vehicle.
3. Do not enter separate depreciation for that same vehicle on the Depreciation screen. Lacerte implicitly considers depreciation in the standard mileage calculation.

Using actual expenses with depreciation

1. On the vehicle or auto screen, select the option to use actual expenses.
2. Set up a corresponding asset in Screen 16, Depreciation for the vehicle:
   • Use an appropriate asset type and recovery period for listed property.
   • Enter cost, business use percentage, and vehicle-specific limits if needed.
3. Enter fuel, repairs, insurance, and other operating costs in the vehicle or expense screens, not as additional “assets.”
4. Confirm that Form 4562 and the K/K-1s reflect the expected depreciation and that luxury auto limitations, if any, are applied.

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Dispositions, like-kind exchanges, and installment sales

Using the Like-Kind Exchange Wizard

For exchange transactions that qualify under Section 1031, the Like-Kind Exchange Wizard helps track basis, boot, and deferred gain between the relinquished and replacement property. See Using the Like-Kind Exchange Wizard in Lacerte for the full workflow.

1. Start from the asset on Screen 16, Depreciation or the dispositions screen, depending on the workflow described in the Like-Kind Exchange Wizard article.
2. Launch the wizard and enter:
   • Relinquished property details (basis, depreciation, date relinquished).
   • Replacement property details (cost, date acquired).
   • Boot paid or received and any liabilities assumed or relieved.
3. Complete the wizard so that Lacerte updates the asset basis and flows gain/loss to the proper forms.

Installment sales and Form 6252

When S-Corps dispose of property on the installment method, you’ll generally enter the sale so that Lacerte can generate Form 6252 and track gain recognition over time. For details, see How to generate Form 6252 for a current year installment sale in Lacerte.

1. Enter the sale using the appropriate disposition input, including selling price, cost basis, and depreciation allowed or allowable.
2. Complete installment-specific fields:
   • Contract price and gross profit.
   • Current-year payments and interest.
3. Verify that Form 6252 generates and that any gain flows to Form 4797, Schedule K, and Schedules K-1 as expected.

Bulk sales and Form 4797

When multiple assets are sold together in a bulk sale, you may need to follow specific input patterns so that Form 4797 generates correctly and prior depreciation and Section 179 are fully captured. See Partnership or S-Corporation Bulk Sale Missing Or Not generating On 4797 for troubleshooting and examples.

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Casualty and theft gains and losses (Form 4684)

Casualty and theft events can trigger gains or losses when the insurance proceeds differ from the asset’s adjusted basis. In S-Corp returns, this often involves property already on the Depreciation screen. For more detail, see Reporting gains and losses from casualty or theft on Form 4684 in Lacerte.

1. Identify the affected asset(s) on Screen 16, Depreciation and confirm accumulated depreciation.
2. Follow the Form 4684 workflow from the casualty/theft article to:
   • Enter insurance or reimbursement proceeds.
   • Compute gain or loss considering basis and depreciation.
   • Route any gain into Form 4797 when appropriate.
3. Review Form 4684, Form 4797, and Schedule K/K-1 to confirm the treatment of ordinary versus Section 1231 amounts.

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Section 179 for S corporations

The Section 179 deduction is subject to several limitations, some applied at the S-Corp level and others carried to shareholders. When Section 179 appears limited or disallowed, start with the diagnostics and the dedicated article, Section 179 Deduction Limited or Disallowed on S-Corporation Return.

Common reasons 179 is limited or disallowed

• Exceeded overall Section 179 dollar limit: Total elected Section 179 for the S-Corp exceeds the statutory limit for the year.
• Insufficient S-Corp taxable income: The corporate-level business income limitation reduces or eliminates the allowable deduction.
• Asset not eligible: Property type, use, or business percentage doesn’t qualify for Section 179 treatment.
• Shareholder-level limits: Even when allowed at the S-Corp level, shareholders may be limited by basis, at-risk, or passive activity rules on their individual returns.

Best practices for Section 179 input

1. Enter qualifying assets on Screen 16, Depreciation with correct cost, business use, and property type.
2. Use the Section 179 fields for amounts you elect to expense, rather than changing the asset life or method to mimic expensing.
3. Review Form 4562 and any diagnostics for messages about limits, carryovers, or overrides.
4. Confirm that Section 179 amounts flow correctly to Schedule K and Schedules K-1 and are available to shareholders subject to their individual limitations.

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Start-up and organizational costs

Certain S-Corp start-up and organizational costs can be expensed up to the annual limit, with the remainder amortized over a specified period. For detailed examples, see How to expense and amortize start-up costs or organizational expenditures.

1. Identify which costs qualify as start-up versus organizational expenditures.
2. Follow the instructions in the start-up costs article to:
   • Enter any immediate deduction allowed in the appropriate input fields.
   • Set up amortizable amounts as intangible assets or on the amortization inputs, using the correct period and method.
3. Verify that amortization appears on the return and in shareholder K-1s as expected.

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Built-in gains tax and depreciation

When a corporation converts from C-Corp to S-Corp status, certain appreciated assets can be subject to the built-in gains (BIG) tax if they’re sold during the recognition period. Depreciation taken after conversion can affect the BIG calculation. For the full workflow, see Generating Built-in Gains Tax in a S-Corporation Return.

• Confirm which assets are BIG-exposed and make sure their basis and prior depreciation (while a C-Corp) are correctly reflected.
• Enter post-conversion depreciation in Screen 16, Depreciation as usual; Lacerte uses this, together with recognized gains, in the BIG calculation.
• Use the built-in gains input screens and reports to reconcile which portion of gain, if any, is subject to BIG tax versus regular S-Corp flow-through treatment.

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Common issues and diagnostics

• Asset doesn’t appear on Form 4562 or 4797: Confirm that the asset is linked to the correct activity, has a valid placed-in-service date, and isn’t marked as non-depreciable.
• Vehicle depreciation looks incorrect: Verify that you haven’t combined standard mileage and actual expense with depreciation for the same vehicle and that luxury auto limitations are properly applied.
• Section 179 is limited or not allowed: Use the guidance in Section 179 Deduction Limited or Disallowed on S-Corporation Return to check income limits, asset eligibility, and shareholder-level constraints.
• Installment sale or bulk sale not generating as expected: Revisit the steps in How to generate Form 6252 for a current year installment sale in Lacerte and Partnership or S-Corporation Bulk Sale Missing Or Not generating On 4797.
• Casualty/theft entries not matching expectations: Confirm basis, accumulated depreciation, and proceeds entries and compare with the workflow in Reporting gains and losses from casualty or theft on Form 4684 in Lacerte.

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Related articles

• Entering a Depreciable Asset in Lacerte
• Using the Like-Kind Exchange Wizard in Lacerte
• How to generate Form 6252 for a current year installment sale in Lacerte
• Reporting gains and losses from casualty or theft on Form 4684 in Lacerte
• Common questions about the vehicle standard mileage rate vs. actual expenses (1120-S/1065)
• Section 179 Deduction Limited or Disallowed on S-Corporation Return
• How to expense and amortize start-up costs or organizational expenditures
• Generating Built-in Gains Tax in a S-Corporation Return