Land vs Building: The Split That Decides Your Depreciation

You paid one price for the property. The tax system needs it in two parts, because the building depreciates and the land underneath it never does.

How you split them sets your depreciation deduction for as long as you own the place. It's the most consequential number most landlords never think about.

Why it matters more than it sounds

Depreciation is calculated on the building, not the land underneath it. A higher building share means a bigger annual deduction; a higher land share means a smaller one.

Get it wrong in your favor and you have a problem if the return is ever examined. Get it wrong against yourself and you quietly under-claim for decades.

How the split is usually made

The property tax assessment. The most common method, and generally the most defensible: your local assessor already publishes separate land and building values. Apply that same ratio to what you actually paid.

This works because you're borrowing an independent valuation rather than inventing one. It's not perfect — assessments lag the market and vary in quality — but it's evidence, and evidence is the point.

An appraisal. More precise and more expensive. Worth it on larger properties, or where the assessment ratio looks obviously wrong for the area.

A reasonable estimate. Acceptable if it's genuinely reasoned and documented. "We used 80/20 because that's what someone said" is not a method.

What it depends on

Where the property is. Land is a far bigger share of the price in dense, expensive areas than in places where the building dominates. A blanket 80/20 rule applied nationally will be wrong in both directions.

What you're depreciating. Some land improvements — fencing, paving, a driveway — aren't the land itself and have their own, shorter lives. Landscaping usually is part of the land. They're often lumped in with land by default, which under-claims.

Whether it was your home first. If the property was your residence before it became a rental, the starting figure follows a different rule, and you apply the land/building split to that instead of to the purchase price.

If you've never made the split

Then you may not have been depreciating at all, which is more common than you'd expect and costs real money — particularly since you're taxed on depreciation you could have claimed whether you claimed it or not.

Our missed depreciation calculator takes a building value and the years you've been renting, and shows the rough scale of what's uncollected.

Fixing it, and settling on a defensible split, is worth doing properly rather than guessing twice. You can ask to be introduced to a specialist in your state — no commitment or fee required.