How to Turn a Rental Property Tax Correction into a Retirement Planning Advantage

I recently sat down with a couple in their early 60s who had owned a rental duplex for eleven years. Sharp people. Well-organized. And yet, after a quick review of their prior returns, it was clear they had been leaving money on the table every single year. Not because of negligence, just because no one had ever explained how rental property depreciation actually works.

The Quiet Mistake That Costs Landlords the Most

Most rental property owners know they can deduct repairs, insurance, and property taxes. Fewer understand depreciation, the IRS-mandated deduction for the wear and tear on the building itself. And a surprising number never claim it correctly, or at all.

Here's what makes this especially consequential: the IRS considers depreciation "allowed or allowable." That means whether you claimed it or not, the IRS assumes you did. When you eventually sell, they'll reduce your cost basis as if you had taken the deduction, which means you'll pay tax on phantom gains you never actually sheltered.

The IRS assumes you took depreciation whether you claimed it or not. If you didn't, you pay the price twice.

Fixing It: Form 3115 and the Section 481(a) Adjustment

The good news: there's a straightforward IRS-approved remedy. By filing Form 3115 (Application for Change in Accounting Method), you can claim all the missed depreciation in a single year as a "catch-up" deduction, called a Section 481(a) adjustment. No amended returns required for each prior year.

For that couple I mentioned, the catch-up deduction was substantial enough to wipe out a significant portion of their taxable income for the year. That freed up cash they were able to redirect into a Roth conversion, turning a tax mistake into a retirement planning move.

The Retirement Planning Angle

As a CFP® and CCIM who works specifically with property owners heading into retirement, I see this scenario constantly. The tax correction itself isn't the end of the story, it's the beginning of a broader conversation about how to deploy the tax savings strategically.

Options worth discussing with your advisor: applying savings toward a Roth IRA conversion in a lower-income year, funding a health savings account, or simply reducing a quarterly estimated tax payment so cash stays in your pocket longer.

A tax correction isn't just about getting money back. It's about what you do with it next.

What to Do Now

If you've owned rental property for more than a few years and have never had a depreciation analysis done, that's where I'd start. Ask your CPA or financial planner to pull your prior Schedule E returns and verify that depreciation has been calculated correctly and claimed in full.

If there's a shortfall, Form 3115 is your path forward. It's a specialized filing, not every tax preparer is familiar with it, but a CPA or enrolled agent who works with real estate investors will know exactly what to do.