Every extra dollar has two jobs it could do. Giving it the wrong one quietly costs you for years.
Usually you do both in order: first capture any employer 401(k) match, then pay off high-interest debt like credit cards, then split extra cash between investing and lower-rate debt based on the rate, your taxes and how much cash cushion you have. The right split depends on the interest rate on each debt compared with what your money could reasonably earn after tax, and on how you sleep at night.
A paid-off balance earns exactly its interest rate. Every month. With no market risk.
Mortgage interest only helps if you itemize. For 2026 the standard deduction is $32,200 for married couples filing jointly and $16,100 for single filers (IRS, 2026). If your itemized deductions don't beat that, your mortgage interest isn't saving you federal tax.
Student loan interest is deductible up to $2,500 a year, subject to income limits (IRS Topic 456).
401(k) room is use-it-or-lose-it. The 2026 employee limit is $24,500, plus $8,000 if you're 50 or older (IRS, 2026). A year you skip is room you don't get back.
So is your low-rate mortgage really “cheap,” or just familiar?
DAITT® starts with Debt Optimization on purpose: Debt Optimization, Advanced Planning, Private Wealth Investments, Tax Strategy and Tax Filing, Trust Planning. For busy professionals building wealth, cash flow is the engine for everything after it. Next, see how high earners can lower their taxes.
Usually both, in order: capture any employer 401(k) match, pay off high-interest debt like credit cards, then split extra cash between investing and lower-rate debt based on each rate, your taxes and your cash cushion.
It depends on your rate, whether you itemize, your cash cushion and your other goals. For 2026 the standard deduction is $32,200 married filing jointly and $16,100 single (IRS), so many households get no federal tax benefit from mortgage interest.
Usually not below the employer match, because the match is part of your pay. Above the match, compare the debt's interest rate with your after-tax investing options.
Up to $2,500 a year of student loan interest can be deductible, subject to income limits (IRS Topic 456).
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We serve Oswego and Aurora, IL, and virtually in all 50 states, from our office in Aurora, Illinois. Call 815-486-0722 or book a Clarity & Discovery Session.
This page is education, not legal, tax or investment advice, and it is not a promise about investment returns or tax results. Examples are illustrations, not clients. Your estate attorney drafts legal documents and your CPA prepares your returns; we coordinate the financial plan around them. Rules and figures change; confirm your own situation before acting. Pinnacle Private Wealth® is a marketing name used by Pinnacle Financial Planning, a Registered Investment Advisor. Registration does not imply a certain level of skill or training.
Reviewed by Dr. Pat Pachciarz®, The Pinnacle Group (Aurora, IL). Last reviewed October 18, 2026. Figures change; we re-check them against the sources above.