Getting Out of High-Interest Debt for Good: A Planning Approach
For most of the professionals I work with at Melby Wealth Management, high-interest debt rarely traces back to how much they earn. The real driver is almost always cash flow and structure. Two people on the same six-figure salary can sit across from me with completely different balance sheets, and what separates them is whether their money has a plan rather than the size of the paycheck.
As a CERTIFIED FINANCIAL PLANNER® (CFP®) professional running a fee-only fiduciary firm in Nashville, my goal in writing this is to show where a plan changes the math on debt that a payoff calculator never captures, and to be honest about when you can handle this on your own.
The Math Is Simple. Staying With It Is Not.
The numbers on credit card debt are not subtle. The average rate on accounts carrying a balance is around 21.5% in 2026, so a $6,000 balance left alone costs roughly $1,290 a year in interest. A 0% balance transfer pauses that interest for a one-time fee of about 3%, or $180 on that balance. A personal loan averaging around 12% beats a card, and credit unions are capped at 18%.
If the math were the whole story, nobody would carry a balance. In my experience, people get stuck for three reasons that no calculator addresses: the debt keeps regenerating because the underlying spending was never reorganized, they cannot decide whether to attack the debt or keep investing, and they have no system that survives a bad month. Planning is what fixes the part the spreadsheet ignores.
Where a Plan Changes the Outcome
For the clients I work with, the real value is not telling them that 21.5% is expensive. They know. It is in the coordination.
I would generally recommend treating any debt above 7% as a priority over new investing, because paying off a 21.5% balance is a guaranteed 21.5% return that no portfolio can promise. For a high earner, though, that decision interacts with other moving parts: whether to pause taxable investing while keeping the full employer 401(k) match, how an end-of-year bonus should be split between the balance and other goals, and how to keep an emergency reserve so a surprise does not restart the cycle. Those tradeoffs are where a fiduciary earns the fee, because the answer depends on your whole picture, not one balance in isolation.
For most clients in this situation, I also build behavioral guardrails into the plan. Automating the payoff payment, sequencing which accounts close first, and setting the specific date a 0% window ends so the balance is gone before the rate resets. The structure is what makes the math actually happen.
A concrete example I see often: a client with a $9,000 balance and a $20,000 bonus landing in March. The instinct is to wipe out the card and feel free. In my experience the better answer is usually to clear the high-interest balance in full, keep enough in cash to avoid running the card back up, and then direct the remainder toward the goals their plan already prioritizes, whether that is funding a Roth, rebuilding a reserve, or staying on pace for a home. The point is that a windfall and a balance should be solved together, in the order that fits your tax picture and your goals, not in isolation. That coordination is the difference between paying a card off once and paying it off for good.
Avalanche, Snowball, and What the Research Actually Says
The mathematically optimal method is the avalanche, attacking the highest rate first. Research on roughly 6,000 real debtors found that people who eliminated smaller balances first were more likely to clear all of their debt, because the early wins kept them going. I do not pick a method for clients based on a chart. I pick the one their history tells me they will finish, and then I help them stay with it. A modestly more expensive plan you complete beats a cheaper plan you abandon.
When Professional Guidance Adds Value Here
If you have one card and a steady paycheck, you can very likely handle this yourself. The blog version of this post walks through exactly how. Professional guidance starts to matter when there is more to coordinate: equity compensation or a variable bonus, multiple account types, a household combining two incomes and two sets of money habits, or a pattern where debt keeps coming back no matter how many times you pay it down. At that point the question stops being "which card" and becomes "how does paying this off fit the rest of my plan."
For the consumer-facing version of this post, head over to Melby Money.
Most people who schedule a conversation with us have never worked with a financial advisor before. That is exactly who we work with. If you want to build a debt payoff plan that fits the rest of your financial life, schedule a financial planning conversation.
About The Author
Shaun Melby, CFP® provides fee-only financial planning and investment management services in Nashville, TN through his company Melby Wealth Management. Shaun has over 15 years of experience as a financial advisor in Nashville. Shaun created Melby Money to educate the public about finances.
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