Unlike rent, which you pay beforehand (i.e., your Jan. 1 bill covers your stay in the rental unit for that coming month), your mortgage payments are made at the end of your occupancy period. That means your Jan. 1 mortgage statement represents interest for December, making it a tax-break-eligible bill for this year.
By accelerating that payment even by just a day, you get an additional deduction for the interest paid.
Don’t get greedy, though. You can’t make your February, or any other upcoming, mortgage payment early to boost your year-end deduction amounts. Tax law generally prohibits write-offs for prepaid interest (there is an exception for loan points in some cases). Each year, you can deduct only the home mortgage interest for that year.
You also want to make sure you don’t cut it too close in making the early payment. Get the check in the mail in plenty of time for it to arrive at your lender by year’s end. If you pay online, be sure you make the electronic transaction in time to have it credited to your payment amount.
That way, the added interest will show up on the annual statement (usually a Form 1098 or an IRS-acceptable substitute) you’ll get from your lender in late January, detailing your deductible mortgage activity.
Timing your payment
Some tax professionals say you can simply make your extra mortgage payment late this month with a check dated Dec. 31 and count it toward your deductions.
What’s your home worth?
However, if you actually get your payment to the bank by the last business day of the year, or a weekday or two early, the extra interest will show up on the lender’s official paperwork. And that means no curious tax examiner will question any difference between the amount you claim on your Schedule A and what your lender reported (and copied to the IRS) on the 1098 form.
If your year-end mortgage statement doesn’t reflect the extra payment’s interest, go ahead and deduct the correct amount on your tax return and attach a statement explaining why your number, not the lender’s, is accurate.
When shifting deductions doesn’t pay
A word of warning about accelerating some tax payments: alternative minimum tax. This parallel tax system was devised almost 40 years ago to guarantee that wealthy filers paid their fair share to the IRS. But nowadays, millions of middle-class filers are finding the AMT applies to them.
There are a couple of reasons so many taxpayers now potentially face the AMT. First, the parallel tax system isn’t indexed for inflation. Without that annual adjustment, regular income increases have pushed many filers close to or into the earnings level where the AMT kicks in.