On Extension? The Rental Numbers to Pin Down Before October 15

If you filed an extension, the rental pages of your return are probably still open. The deadline for extended individual returns is October 15, 2026, per the Nimbus tax calendar. The inputs most likely to go wrong on Schedule E don't come from a tax form. They come from paperwork you have to find yourself: the closing statement, the date the unit was ready to rent, and the invoices behind each large expense.

This post walks through each input. It explains why each one matters and what to pull for every property you own. It is general information, not tax advice. If you work with a preparer, bring this list to them.

Why the rental section is where errors hide

Most of the rental section is plain arithmetic: rent in, expenses out. The part that goes wrong is depreciation, and depreciation rests on facts you only set once. If one of those facts is wrong, the error carries into every year after.

Many owners are setting these numbers for the first time. According to a Nimbus portfolio reading, 46 of 69 properties tracked in Nimbus were bought in the last 5 years. The same reading shows that 0 of 69 properties have a document attached in Nimbus. In practice, the closing statements and invoices are likely sitting in inboxes and file drawers, not next to the numbers they support.

Cost basis: what you paid, minus what you can't depreciate

Basis starts with the purchase price. You then add certain settlement costs from your closing statement, such as title fees, recording fees, transfer taxes and legal fees. Costs tied to getting the loan follow different rules, so keep them in a separate list.

Land is never depreciated, so you have to split the price between land and building. Many owners use the ratio on the county assessor's record. Others use an appraisal. Whichever you choose, write down the method so you use it the same way every year.

Work done before the property was first available to rent, such as a new roof or new flooring, is usually added to basis rather than deducted.

If the rental used to be your home, the rules for converted property apply. Your depreciable basis is generally the lower of your adjusted basis or the fair market value on the date you converted it. Under this rule a recent appraisal or a comparable sale is worth finding.

Placed-in-service date: when depreciation starts

The placed-in-service date is not the day you closed. It is not the day your first tenant moved in either. It is the day the property was ready and available for rent.

That date matters because residential rental property is depreciated over 27.5 years under MACRS (IRS Publication 527). The start date fixes the depreciation you can take in the first year and the schedule for every year after. If the date is off, each year that follows is off too.

To pin it down, look for dates you can show:

• The date you first listed the property for rent
• The date the final make-ready work was finished
• A certificate of occupancy, if your city issues one
• The signed lease, which shows the latest possible date

Repairs versus improvements

A repair keeps the property in ordinary working condition. You deduct it in the year you pay for it. An improvement makes the property better, restores it, or adapts it to a new use. You capitalize an improvement and depreciate it over time.

In practice, patching a roof leak is a repair and replacing the roof is an improvement. Fixing a faucet is a repair and gutting the bathroom is an improvement. The invoice description often decides which it is, so a receipt that just says 'labor' doesn't help you much. There are safe harbors that let some smaller costs be deducted. Ask your preparer whether they apply to you.

If your rental's transactions are already in Nimbus, you can have Chene list the year's maintenance costs. Then you go through them and mark each as a repair or an improvement.

CCSound onFull

The checklist, per property

For each property, gather:

• The final closing statement from the purchase
• The land and building split, and where it came from
• Invoices for any work done before the property was first rentable
• Proof of the placed-in-service date (listing, lease, or occupancy record)
• Invoices for this year's larger expenses, with clear descriptions
• Prior-year depreciation figures from last year's return, so the schedule continues correctly
• Mortgage interest and property tax statements

Go through this list one property at a time rather than one document type at a time. That way it's clear when a single property is finished.

Owning in more than one state

Nimbus owners are spread out. The same Nimbus reading counts 17 owners across 14 states. The federal rules above are the same in every state. State returns, though, don't always follow federal depreciation, and property tax records look different from county to county. Use the checklist above everywhere, and ask your preparer about any state-specific adjustments.

Fix it now so April is easier

Most of this scramble comes from having to rebuild facts after the fact. A few habits keep that from happening next year:

• Keep a folder for each property, named by address, and save the closing statement there on the day you close.
• Write down basis, the land split and the placed-in-service date in a note inside that folder, once, while you have the documents in front of you.
• Mark each large expense as a repair or an improvement when you pay it, not months later.
• Ask contractors to describe the work on the invoice, not just list a total.

None of this changes what you owe. It just means that next spring you are checking the numbers instead of hunting for them.