Tax Year-End Timing and Study Deadlines

The calendar shapes cost segregation decisions in several ways. Some dates are legal, such as return deadlines. Others are practical, such as provider availability. This page sorts them out.

The placed-in-service date near year end

A property must be placed in service in a tax year for depreciation to begin in that year. A building ready for tenants on December 28 may have been placed in service in that year, while one that becomes ready on January 3 was placed in service the next. The line depends on facts, such as whether the property was ready and available. Do not rush to place property in service purely for tax reasons without confirming the facts with your preparer, because the rules depend on real readiness and use.

Short first-year effects

For ordinary building depreciation, a property placed in service late in the year generates little first-year depreciation because of the convention rules. For property with shorter lives, conventions also matter if bonus is not used. A property placed in service in the last part of the year can affect which convention applies to other property placed in service that year. This is a technical rule, so ask your preparer how it affects you. Bonus depreciation, where available, can reduce the importance of conventions for qualifying assets.

Filing deadlines and extensions

A study is typically needed when the return is prepared. If you file on extension, you have more time. Many owners extend to allow the study to be completed. If you are making a method change, the form is generally filed with the return by its due date including extensions, so an extension can also give time. Confirm the current rules and dates with your preparer.

Estimated tax payments

If a study will change your taxable income materially, discuss estimated tax payments with your preparer. A large deduction might reduce required payments in later quarters or affect underpayment calculations.

Provider capacity

Providers tend to be busier before filing deadlines. If you wait until just before a deadline, you may have limited options or pay for rushing. Ordering earlier can reduce stress. See How Long a Study Takes and What You Provide.

Year-end planning considerations

Some owners look at year-end to decide whether to accelerate or defer income or purchases. A study is not a year-end move to be made lightly, since it involves detailed analysis, but the timing of when you place assets in service, buy equipment, or complete renovations can be planned. Discuss with your preparer.

Buying near year end

If you close on a property near year end, the first-year depreciation may be small for the building but potentially significant for personal property if bonus applies. Whether the study helps for that first year depends on the rules and on your usability. See Year of Acquisition: Why Timing Matters for a Study and Bonus Depreciation: Rules as Currently Understood (Verify).

Selling near year end

If you plan a sale, remember that recapture is recognized in the year of sale. Timing the sale in one year versus another can change the tax picture. See Selling Soon: Timing Issues With a Study.

A caution about deadlines

Do not rely on general educational content for deadlines. Tax deadlines can shift because of disasters or legislative changes. Confirm with your preparer.

Simple year-end checklist

1. Confirm placed-in-service dates.
2. Gather invoices and closing documents.
3. Decide on extension if needed.
4. Review estimated tax with the preparer.
5. Engage the provider early.

Illustrative calendar in words

Suppose a calendar-year owner wants to have a study used on a return due in the spring, with an extension available to the fall. Working backward, the return would need the report by late summer if the extension is used. The provider needs a few weeks for a site visit and analysis. The owner needs a couple of weeks to gather documents. So the process should begin in early summer at the latest. An owner who starts in early fall has little time and might face rush charges. This is only an illustration of the logic, and actual timelines vary.

Interaction with other planning

If you also plan to sell a property, acquire another, or change entity structure in the same year, coordinate the study with those events. The recapture and basis effects interact. A single planning meeting with your preparer that lays out the year's events can reduce mistakes.

Extensions are not extra time to pay

An extension to file a return generally does not extend the time to pay tax due. If a study is expected to change the amount owed, ask your preparer how to handle any estimated payment. This is a general point to confirm, not a substitute for professional advice.

Records to close out the year

At year end, collect receipts for any equipment, furniture, or improvements placed in service, confirm placed-in-service dates, and update your participation log. A clean year-end file makes the study and the return easier and reduces the chance of missing an asset.

Next steps

See A Month-by-Month Planning Calendar for the Purchase Year for a month-by-month approach after an acquisition.