How should I track mortgage principal vs. interest for rental properties?

Every mortgage payment you make on a rental property contains at least two components, and they get recorded very differently in your books. The interest portion is a deductible expense on Schedule E. The principal portion is not an expense at all. It reduces your loan balance on the balance sheet. Recording the full payment as an expense is one of the most common mistakes real estate investors make, and it inflates your deductions in a way that will cause problems if the IRS looks closely.

Here is how a typical mortgage payment breaks down. Say your monthly payment is $1,800. In any given month, that might be $650 in principal, $720 in interest, $280 in property tax escrow, and $150 in insurance escrow. Each of those four pieces goes somewhere different in your accounting. The interest hits your interest expense account. The principal reduces your mortgage liability. The property tax escrow goes to a property tax expense or escrow holding account. The insurance escrow goes to an insurance expense or escrow holding account.

Your lender’s amortization schedule tells you exactly how much of each payment is principal and how much is interest. Early in the loan, most of the payment is interest. As the loan matures, the split shifts toward principal. This means the deductible portion of your mortgage payment changes every single month. If you’re recording a flat amount to interest expense all year, your books are wrong.

For escrow items, some investors record the escrow payments as expenses when they leave the bank account. That works, but the more accurate approach is to track escrow as a balance sheet item and record the expense when the lender actually pays the property tax or insurance bill. Either method can work as long as you’re consistent and the year-end numbers land correctly.

At the end of the year, your lender sends Form 1098 showing total interest paid and property taxes paid from escrow. Use this to true up your December books. If your monthly tracking drifted slightly from the lender’s records, the 1098 is the number that matters for your tax return. Adjust your books to match before closing the year.

If you own multiple rental properties with separate mortgages, each property needs its own tracking. Schedule E reports income and expenses by property, so your bookkeeping should mirror that structure. Lumping all mortgage payments into one account makes it nearly impossible to prepare accurate tax returns without going back and untangling everything.

The right way to handle this is to set up your chart of accounts with separate liability accounts for each mortgage and use your amortization schedule to split every payment correctly when it’s recorded. Working with bookkeepers in Fairfax who understand rental property accounting means this gets handled properly from the start rather than cleaned up at tax time. Getting this wrong doesn’t just produce bad financial statements. It produces a tax return with overstated deductions that you’d have a hard time defending.