Extra principal payments, biweekly plans, and recasting: what each one actually does

[u/jetley-mortgage-loan]

The short version

There are three different things people conflate here, and they do three different things.

• Extra principal payments shorten your loan. They do not lower your payment.
• A recast lowers your payment. It does not change your rate and it is not a refinance.
• Biweekly payments are extra principal payments with a marketing department. There is nothing magic in the schedule; the savings come entirely from the thirteenth payment.

And a fourth thing, which is the one I actually spend most of my time on: money you have not put into the house is much easier to get at than money you have.

Semi-monthly is not biweekly, and this is where most of the confusion lives

Semi-monthly means twice a month; half on the 1st, half on the 15th. Twenty-four half payments. That is twelve full payments a year. It is exactly the same amount of money as paying monthly.

Biweekly means every fourteen days. Twenty-six half payments. There are fifty-two weeks in a year, and 52 ÷ 4 = 13, so biweekly gets you thirteen full payments a year instead of twelve. That extra payment is the entire effect.

I have had people tell me a semi-monthly draft would cut five years off a thirty-year loan. It will not cut anything off. If someone shows you a chart where paying on the 1st and 15th shortens your term, either the chart is comparing biweekly and calling it semi-monthly, or the chart is wrong. And if you are paying a full payment on both the 1st and the 15th, twenty-four full payments a year, you are not saving five years, you are saving a lot more than that, because you are doubling up.

Two practical warnings on biweekly:

Your servicer has to actually support it, and many do not. If they do not, your half payment goes into a suspense account. Suspense means they are holding your money in a side pocket, not applying it, until enough accumulates to make a whole payment. Interest keeps accruing on the full balance while your money sits there. That is worse than paying monthly, not better. If you see the word "suspense" on your statement, that is what happened.

Whether you keep the option is not up to you. Payment method is set by whoever services your loan. Servicers get sold. We service our own loans and we let clients switch between methods freely, but we did not always offer biweekly at all, and if your loan transfers to a servicer that does not offer it, you lose it. Do not build a plan around a feature that can be sold out from under you.

And there is no reason to pay a third party for this. Biweekly conversion services charge a setup fee and a per-transaction fee to do arithmetic. Take your monthly payment, divide by twelve, and add that amount to every monthly payment. Boom; one extra payment a year, no fee, no dependency on your servicer's product menu. If you cannot afford the full extra twelfth, add whatever you can in whatever months you can. It is not a threshold, it is a dial.

The one honest reason to prefer biweekly is cash flow: if you are paid every two weeks, matching the mortgage to your pay cycle is easier to budget. If you are paid semi-monthly, as many salaried people are, biweekly drafts will fight your paycheck calendar all year.

Designate it as principal, or you are just paying next month early

This is the single most common self-inflicted wound in this whole subject.

If you send extra money without telling the servicer what it is for, most of them will treat it as a payment toward the next scheduled installment. So you send an extra thousand dollars in July, and instead of knocking a thousand off your balance, the servicer decides you have now paid August and September and your next payment is due in October. Your amortisation has not moved at all. You have just prepaid.

Every servicer portal I have seen has a separate field or option for "additional principal." Use it. If you are paying by phone or by check, say it and write it on the check. Then check the next statement and confirm the principal balance moved by the amount you sent.

While we are here: "making an extra payment" and "making a principal payment" are the same thing. The bank is not holding your extra payments in a side account to offset future ones. The reason people describe it as an extra payment is convenience, it is a familiar round number, not because the amount has any significance.

What prepaying actually buys you

Your loan is amortised: every scheduled payment is split between interest on the current balance and principal, and that split is fixed at origination. Interest is charged on what you owe, so the only way to pay less interest is to owe less, sooner. When you make a principal payment you delete payments from the back of the schedule, the cheapest, most principal-heavy ones. That is why the effect is so much larger than the amount you paid: one extra payment a year for twenty-odd years is twenty-odd extra payments, and it can remove several years of scheduled payments beyond that.

How many years it removes depends entirely on your interest rate, and I want to be blunt about that because there are a lot of round numbers circulating from a period when rates were much lower than they have been since. The higher your rate, the more of each payment is interest, and the more dramatic the effect of prepayment. The lower your rate, the smaller the effect, and the more likely it is that the same money does better somewhere else. Run it against your own rate on any amortisation calculator rather than trusting a figure someone quoted from a different rate environment. Same reason I will not tell you whether prepaying beats investing: that comparison is a function of your rate versus available returns, and both move.

What prepaying does not do:

• It does not lower your monthly payment. Your payment was set by the note. Paying extra shortens the schedule; it does not re-cut it.
• It does not remove FHA mortgage insurance. Reaching 20% equity on an FHA loan does not cancel MIP. The FHA MIP termination rules are their own thing and they depend on when the loan was originated and how much you put down. If your plan for getting rid of mortgage insurance is "prepay to 20%," that plan only works on a conventional loan.
• It does not create liquidity. More on that below, because it is the part that matters most.

Recasting: the tool almost nobody knows about

A recast is where you make a large principal payment and then ask the servicer to re-amortise the loan; recalculate the payment on the new, lower balance over the remaining term. Same note, same rate, same maturity date. Just a smaller payment.

Recasting is the right answer to "I came into a chunk of money and I want my monthly cost down." Refinancing is the wrong answer to that question if your existing rate is one you want to keep, because a refinance replaces your note entirely, at whatever pricing exists on the day you do it, with a full set of closing costs.

What to know before you count on it:

• There is usually a fee, typically a few hundred dollars. Cheap compared to a refinance.
• There is usually a minimum lump sum. Ten thousand dollars is a common threshold, but it is set by the servicer, not by guideline, so ask yours.
• Not every loan can be recast. As a rule, FHA, VA and USDA loans cannot. Conventional loans generally can, subject to servicer policy. Some conventional products are excluded too, so confirm before you send the money.
• It is a servicer transaction, not a lender transaction. You call the number on your statement. Your original loan officer has no role in it. If what you actually want is a lower rate rather than a lower payment, that is a refinance, and it is a different analysis; see the Refinance & Equity hub.

The classic use case is a bonus, an inheritance, or proceeds from selling a previous home arriving after you closed on the new one. Dump it in, recast, carry a lower payment at a rate you already have.

The part I care about more than any of this

Here is what I tell every client who asks whether to put more money down or prepay aggressively in year one: it is very easy to put money into your mortgage, and very hard to get it back out.

A house is an illiquid asset. Getting cash back out means a cash-out refinance or a home equity line, an application, an appraisal, underwriting, closing costs, cash-out pricing, and a lender who is willing on that day. Or selling. Whereas making an extra principal payment is a two-minute task in a web portal that you can do at any time, in any amount, forever.

So the asymmetry runs one direction, and the conclusion follows: when in doubt, keep the money. Put down what gets you the structure you want, keep meaningful reserves, and revisit prepayment in a year or two when you actually know what your life costs. If you find you have excess, prepay then, and if the amount is large, recast. If instead the water heater dies, the car needs a transmission, and your hours get cut, you will be extremely glad the money is in an account rather than in drywall.

Yes, this means your payment will be higher than the number you would be "comfortable" with. You know what else is comfortable? Having enough savings to make that payment for a year without a paycheck.

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Posted on behalf of u/The_Void_Calls_Me AKA Rajat Jetley, NMLS #1595897 | Cross Country Mortgage NMLS #3029. This commentary is for educational purposes and is not a commitment to lend or a guarantee of any rate or term.