Yes, the principal part of your mortgage payment can count toward your savings rate, including any extra principal you prepay, because it raises your net worth dollar for dollar. Interest, property tax, homeowners insurance and PMI never count. They’re costs of living in the house, the same as rent.
Whether you should count principal depends on what you want your savings rate to tell you. If it’s tracking net worth growth, include it. If it’s tracking how fast you’re building money you can actually live on in retirement, leave it out. Either is fine; switching back and forth isn’t.
Which parts of a mortgage payment count as savings? #
A typical payment has four parts, often called PITI:
| Part | Counts as savings? | Why |
|---|---|---|
| Principal | Yes, if you choose to count it | Reduces what you owe, so net worth rises |
| Interest | No | Paid to the lender, gone for good |
| Property tax | No | A cost of owning the home |
| Insurance and PMI | No | A cost of owning the home |
Early in a loan the principal share is small. On a $400,000, 30-year mortgage at 6.5%, the principal-and-interest payment is about $2,528. In the first month, about $2,167 of that is interest and only about $361 is principal. Over the whole first year, principal adds up to roughly $4,500. Counting the full payment as “savings” would overstate your rate badly.
Your lender’s amortization schedule, or the principal line on each statement, gives you the exact figure.
Two ways to calculate your savings rate with a mortgage #
Method 1: net worth savings rate (includes principal) #
Savings rate = (investments + cash saved + mortgage principal paid) ÷ after-tax income
This matches how your net worth actually changes. It suits people who plan to downsize or sell in retirement and use the equity.
Method 2: liquid savings rate (excludes principal) #
Savings rate = (investments + cash saved) ÷ after-tax income
This treats your whole mortgage payment as a living expense. It’s the more useful number for FIRE timing, because your FIRE portfolio has to be money you can withdraw, and you can’t buy groceries with home equity without selling, borrowing against it or refinancing.
Use the same denominator you use for everything else. Our guide to gross vs net savings rate explains why after-tax income works best for FIRE math.
Should you pay off your mortgage early or invest? #
Extra principal earns a guaranteed return equal to your mortgage rate. Investing earns an uncertain return that has historically been higher over long periods. How to weigh them:
- Mortgage rate above 6% to 7%: a guaranteed 6.5% is hard to beat on a risk-adjusted basis, especially for money you’d otherwise keep in bonds.
- Mortgage rate around 3% to 4%: most people come out ahead investing the extra, as long as they actually invest it.
- The tax angle has mostly disappeared. Mortgage interest only saves tax if you itemize, and the 2026 standard deduction is $32,200 for married couples filing jointly and $16,100 for single filers, per the IRS. Most households take the standard deduction, so their interest isn’t deductible in practice.
- Liquidity matters. Money sent to the bank can’t be taken back in a layoff. Build your emergency fund and take any 401(k) match before prepaying.
How a paid-off mortgage changes your FIRE number #
Your FIRE number is roughly 25 times the annual spending your portfolio has to cover. Remove the mortgage payment and that number drops.
- With a mortgage: $80,000 of spending, including $24,000 of principal and interest. FIRE number: $2,000,000.
- Mortgage paid off: $56,000 of spending. FIRE number: $1,400,000.
That $600,000 difference is why many FIRE households aim to retire with the house paid off. Two details keep the math honest. Property tax and insurance don’t go away, so they stay in your spending. And if your mortgage will end a few years into retirement anyway, you don’t need to fund that payment forever; you only need enough to cover it until the payoff date. A fixed payment also shrinks in real terms every year as inflation rises.
You can compare the scenarios quickly in Retire Goals: run its FIRE Number calculator once with your current spending and once without the mortgage, then set up the goal you’re actually chasing and watch its projected finish date. Our walkthrough of how to calculate your FIRE number covers choosing the withdrawal rate.
Does the down payment count as savings? #
Saving for it counts, month by month, as you build it. Buying the house doesn’t: on closing day you swap cash for home equity, and your net worth barely changes apart from closing costs. Counting the whole down payment as savings in the month you close would spike your rate for one month and make your trend meaningless.
Home equity vs your FIRE portfolio #
Home equity is real wealth, but it doesn’t pay bills on its own. Most people track it in net worth but leave it out of the portfolio that funds retirement, unless they have a concrete plan to downsize or rent out part of the property. Our post on net worth vs savings rate covers which number to watch when.
Frequently asked questions #
Does my down payment count toward my savings rate? #
Saving for it does. Record the money as savings while it accumulates in your account. The purchase itself is a transfer from cash to home equity, not new savings.
Should I include home appreciation in my savings rate? #
No. Your savings rate measures the share of income you don’t spend. Appreciation is an investment gain, like a stock going up, so it belongs in your net worth, not your savings rate.
Does home equity count toward my FIRE number? #
Usually not. Your FIRE number is the invested money you’ll withdraw from. Equity only counts if you plan to sell, downsize or borrow against the house, and even then only the portion you’d free up.
Is extra mortgage principal better than contributing to a 401(k)? #
Usually not before you’ve captured your full employer match, which is an immediate return no mortgage can beat. After that it depends on your rate, your tax bracket and how much you value being debt-free. Many people split extra money between the two.