Should you pay down your mortgage or invest? Here is the arithmetic.
A 6.95% mortgage is the only guaranteed 6.95% return most households can buy. Every risk-free alternative on offer in September 2026 pays less than that. Four assumptions decide the rest.
- What happened
- Freddie Mac put the 30-year fixed mortgage at 6.95% in the week of September 17, 2026, up from 6.76% the week before and 6.26% a year earlier.
- Why
- Paying an extra dollar into a 6.95% mortgage removes a dollar of debt that was compounding at 6.95%. That is a certain return of 6.95%, before tax. Nothing with a known rate of return pays as much in September 2026.
- The numbers that matter
- 6.95%30-year fixed mortgage5.00%10-year Treasury4.2%Top savings accounts0.37%Average savings account3.4%Inflation
- Why it matters
- It is one of the few money questions where the arithmetic is genuinely decidable, and it is routinely answered with a rule of thumb instead.
- What happens nextas we saw it on 23 Sep 2026
- Freddie Mac publishes the mortgage survey weekly; the FDIC publishes the national deposit rate monthly.
Paying down the mortgage is the highest certain return on this chart. Everything above it on the risk scale is not on this chart, because its return is not knowable.
| 30-yr mortgage | 6.95% |
|---|---|
| 15-yr mortgage | 6.26% |
| 10-yr Treasury | 5.00% |
| Top savings | 4.20% |
| Average savings | 0.37% |
Most answers to this question are a preference dressed as advice. The arithmetic is not complicated and it is rarely shown, so here it is, with every number dated and every assumption named.
We are not going to tell you which to do. The point of writing it out is that once you can see it, the decision is yours and not ours.
The one thing that is certain
Freddie Mac put the 30-year fixed mortgage at 6.95% in the week of September 17, 2026. It was 6.76% the week before and 6.26% a year ago.
A mortgage balance compounds against you at the loan rate. Removing a dollar of it removes 6.95% a year of future interest, for as long as the loan would have run. The return is not an estimate, it is not a forecast, and it does not depend on what markets do. It is 6.95%, guaranteed by arithmetic.
That is an unusual thing to be able to buy. Almost every other guaranteed return in finance is lower, because a guarantee is expensive to provide. So the real question is not “is 6.95% good” — it is what else is on offer at the same level of certainty.
What else is on offer, at the same certainty
| What | Rate | As of | Certain? |
|---|---|---|---|
| Paying down a 30-year mortgage | 6.95% | September 17 | Yes |
| Paying down a 15-year mortgage | 6.26% | September 17 | Yes |
| 10-year Treasury | 5.00% | September 15 | Yes, if held to maturity |
| Best available savings accounts | around 4.2% | September | Yes, but the rate can change |
| Average US savings account | 0.37% | September | Yes, and it is what most people get |
| Inflation, for reference | 3.4% | 12 months to August | Already happened |
Every rate in that table with a knowable return pays less than the mortgage. To beat 6.95% you have to take risk — which may well be the right thing to do, but it is a different decision from the one people think they are making. “Invest instead” is not a higher-return choice. It is a higher-expected-return, uncertain-outcome choice.
Four assumptions that change the answer
The 6.95% figure is real but it is not the whole calculation. Four things move it, and three of them move it in the same direction.
1. Whether you itemize
If you deduct mortgage interest, your effective rate is lower than 6.95% and the comparison narrows. Most households do not, because the deduction has to clear the standard deduction before it is worth anything — and for 2026 that is $32,200 for a married couple filing jointly and $16,100 for a single filer.
A $400,000 30-year mortgage at 6.95% pays about $27,700 of interest in its first year — the year the interest is highest. That is below the $32,200 joint standard deduction on its own. Mortgage interest only starts to matter for a joint filer above roughly a $470,000 balance, and that is before the rest of the return is amortized away.
Run your own: at 6.95%, first-year interest is about $20,800 on a $300,000 balance, $27,700 on $400,000, $34,600 on $500,000 and $41,500 on $600,000. Compare it with your filing status's standard deduction, and remember it falls every year as the balance amortizes.
2. Whether there is an employer match
An employer match is an immediate return on the money contributed, before any investment return at all. A 50% match returns 50% the moment it lands. No mortgage rate competes with that, and a comparison that ignores the match is not a comparison.
This is the one assumption that reverses the answer outright, and it is specific to money that is eligible for a match. Once the match is exhausted, the ordinary comparison resumes.
3. Liquidity
A dollar paid into a mortgage is gone until you sell the house or borrow it back. A dollar in a brokerage account or a savings account can be reached on a bad month. The mortgage pays a higher certain rate partly because it takes your access to the money away, and that is a real cost that does not show up as a rate.
It also matters in what order things happen. Paying down principal does not lower next month's payment on a fixed-rate mortgage — it shortens the loan. A household that prepays and then loses its income still owes the same monthly amount, with less cash to pay it.
4. How much of the term is left
Mortgage interest is front-loaded. On a $400,000 loan at 6.95%, the scheduled payment is about $2,648 a month, and in the first year roughly $27,700 of that goes to interest and only $4,100 to principal. An extra $500 a month from the start retires the loan in about 19 years instead of 30 and cuts total interest from roughly $553,000 to about $326,000. The same $500 applied in year 25 saves a small fraction of that.
Putting it together
- The mortgage is the best certain return most households can buy at 6.95%, and every risk-free alternative pays less.
- An employer match beats it and should generally be taken first, because it is not an investment return at all.
- A tax deduction narrows the gap, but only for households whose interest clears the standard deduction — which at current rates means a large balance.
- Everything else is a question about risk tolerance and access to cash, not about arithmetic.
Sources
- 30-Year Fixed Rate Mortgage Average in the United States (MORTGAGE30US), observation of September 17, 2026Freddie Mac via FRED, Federal Reserve Bank of St. Louis · Sep 17, 2026 · Primary source
- Primary Mortgage Market Survey, week of September 17, 2026Freddie Mac · Sep 17, 2026 · Primary source
- National Rate: Savings (SNDR), observation for September 2026Federal Deposit Insurance Corporation via FRED, Federal Reserve Bank of St. Louis · Sep 2026 · Primary source
- Average savings account interest rate, survey of institutionsBankrate · Sep 22, 2026 · Secondary source
- IRS releases tax inflation adjustments for tax year 2026 (Revenue Procedure 2025-32)Internal Revenue Service · Oct 9, 2025 · Primary source
- 10-Year Treasury Constant Maturity Rate (DGS10), observation of September 15, 2026U.S. Department of the Treasury via FRED · Sep 15, 2026 · Primary source
- Consumer Price Index Summary — August 2026U.S. Bureau of Labor Statistics · Sep 11, 2026 · Primary source
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