The White Coat Investor Network[Editor's Note: The following post originally published on WCI Network partner, Physician on FIRE and is about a frequently discussed topic on this site — paying off debt as quickly as possible.]


Debt free by forty. That’s the goal I set. I liked the sound of it and at some point in my mid-thirties, I realized it was a possibility for us.

When I said debt-free, I didn’t mean having a zero or positive net worth with assets equal or greater than debts. I meant I didn’t want to owe nothing to nobody. Positive net worth, zero debt.

My decision wasn’t based on mathematical modeling. I didn’t cycle different scenarios through a spreadsheeet.

It was a personal decision. A psychological decision. Nothing more.

I had taken on some serious debt and paid some serious interest. While chipping away at my student loan debt, I added a half-million dollar construction loan. With an initial interest rate above 5%, I was on the hook to pay more than $25,000 a year in interest on that loan alone (getting some of that back as a tax deduction at the marginal tax rate).

I wanted to be done paying interest. I wanted to truly own the things I pretended to own and I wanted it to happen by my fortieth birthday.

It almost didn’t happen.


The Math Behind Paying Off Your Mortgage


For the most part, I ignored the math, although I knew in my head what the consequences of mortgage payoff would be.

our “starter home”

At a 5% interest rate and a 40% marginal tax rate, I was effectively paying about 3% a year on the principal. This was true because I had itemized deductions.

If you take the standard deduction, which will be much more common with the increased standard deduction resulting from the Tax Cut and Jobs Act, you are paying the full mortgage interest rate, getting no deduction on the interest you pay.

If your itemized deductions barely surpass the standard deduction, you’re essentially deducting very little of your mortgage interest. It’s good to know where you’re at with deductions.

Back to the math, where I had plenty of itemized deductions. Assuming the principal that I owe is working for me and invested in my portfolio, I would need at least 3% returns in a given year to break even on carrying the mortgage.

Perform better than that (should happen) and carrying the mortgage wins. Underperform 3% returns (tough to get a guaranteed 3%) and mortgage payoff wins.

The math is simple. With today’s low (but climbing) interest rates, I would say carrying the mortgage wins more often than not from a probability standpoint. From a psychological standpoint, being debt-free is a state of being that has significant value that’s much more difficult to quantify.

I chose the option to be debt-free and haven’t regretted it one bit.


The Math Behind Paying Off Student Loans


The other heavy debt burden carried by many of us are student loans. The payoff calculations are similar, but not identical for the high-income professional.

In the lower tax brackets, student loan interest is tax deductible. The deduction is phased out at an adjusted gross income of $70,000 to $85,000 for individuals in 2019 (double that if married, filing jointly), an income most physicians will exceed.

Just like the tax filer who takes the standard deduction pays full fare for mortgage interest, those of us with strong salaries pay every penny of our student loan interest without a tax benefit.

If your loans are at 6.8% and you are not pursuing a loan forgiveness plan like PSLF, you should consider refinancing your loans Otherwise, at that high interest rate, you would need returns exceeding 6.8% to break even on carrying those.

I had consolidated my student loans to a low interest rate, but chose to pay them off with a lump sum that came in the form of a signing bonus a few years shy of my fortieth birthday.


The Plan to Be Debt Free


Every goal needs a good plan, and mine evolved as our situation changed. We actually moved a couple of times and bought a couple more homes. It’s a long story.

For several years, we steadfastly refused to give up our dream home even though we were living and working a couple of states away. We had long term renters, we had seasonal renters, and we even used the place some ourselves. Eventually, though, we realized we were holding on to the past which was making life in the present more difficult and potentially jeopardizing our future as we were basically hemorrhaging money. I had been funneling all my locums earnings towards the mortgage, but the balance was around a quarter million, and wasn’t going to disappear soon.

Meanwhile, we bought the home we currently live in for half of what we put into that dream home, paying cash. When I was about 39.8 years old, after about a year and a half on the market, we finally sold the one-time dream home for a $200,000 loss plus realtor fees. 4,000 square foot waterfront homes don’t sell as well after the only hospital in town shuts down.


Dream House Sunset

i do miss those sunsets


The day we closed was one of the worst and best days of my life, financially speaking. We lost a ton of money that day (or at least realized the loss). We also became free.

Although I could have considered us to be financially independent based on the home equity, it didn’t feel real until the home was sold and the money was in our hands.

A couple years earlier, I paid off the last of my student loan debt with a lump sum payment from a generous signing bonus. When we sold the house 10 weeks shy of my fortieth birthday, we were officially 100% debt free.


Should You Pay Off Your Loans or Invest the Difference?


Many a blog post and forum thread has been written addressing the question, and I could fill a page with links to the

various discussions on the hot topic. I won’t do that to you, but here are a few:


Ultimately, the answer depends on a number of factors. Some are simple math. Are they high-interest loans? Is the interest tax deductible and are you in a high tax bracket? Do you think you can get a better return elsewhere?

What do you think? Are you debt free? What sacrifices did you make to become that way? Was it worth it? Comment below!