Rate strategy is the set of levers you can pull once you have a quote in hand: lock it, float it, buy it down with discount points, or have a seller or builder fund a temporary buydown. A rate lock freezes your quoted rate for a set window, typically 30, 45, or 60 days, and sometimes longer, and each step up in length is paid for in price rather than in cash. One discount point costs 1% of the loan amount, so on a $300,000 loan that’s $3,000; if the point buys a quarter point of rate, you save roughly $45 – $50 a month and break even somewhere around five years.¹

Learn how mortgage rate strategy works, including when to lock and what an extension costs, how to run the break-even math on discount points, and how temporary and permanent buydowns differ.

Key takeaways:

• A lock is insurance, not a bet: Locking freezes your quoted rate for a defined window, typically 30, 45, or 60 days, and the longer the window, the more the lender charges in price.
• A point has a break-even: One discount point costs 1% of the loan amount and commonly lowers your rate by about 0.25%, which usually takes five to six years of payments to recover.
• Let someone else fund the temporary buydown: Buy permanent points only if you’ll keep the loan past the break-even, and take a 2-1 buydown when a seller or builder is paying for it.

What is a mortgage rate lock, and when should you lock?

A mortgage rate lock is a lender’s written commitment to hold your quoted rate and points for a set number of days while your loan is processed. Close inside that window without materially changing your application, and the rate on your Loan Estimate is the rate on your closing paperwork.

Think of a lock like a deposit that holds a price. It protects you from an increase, and, unless you separately buy the option to change your mind, it gives up the benefit of a decrease. Hold onto that picture; it explains most of what follows.

A lock is not unconditional. The Consumer Financial Protection Bureau is explicit that a locked rate can still move if your application changes, including your loan amount, your credit score, or your verified income. Locking is not a substitute for keeping your file clean between application and closing.

On timing, lenders in Align’s network generally price a lock best once there’s a property address attached, which for buyers means after an accepted purchase agreement. On a refinance, you can usually lock as soon as the application is in. Federal disclosure rules require your Loan Estimate to state whether the rate is locked and, when it is, the exact date and time the lock period ends. That date is the one to build your closing schedule around.

Locking early costs you the chance at a better rate. Locking late costs you certainty. The honest answer to “when should I lock” is “as soon as the payment works and your closing date is realistic,” because the benefits of mortgage rate locks are budget certainty and protection from a bad week in the bond market, not a prediction about where rates go next.

Lock periods, extensions, and float-downs: What each one costs

Standard lock windows run 15 to 90 days, and each step up in length costs you in price rather than as a separate fee. Lenders in Align’s network generally build a 30- to 60-day lock into the quote itself, then price upward as the window stretches, because the lender is carrying market risk the entire time.

Lock option	Typical window	What it costs	When it’s worth it
Standard lock	30 – 60 days	Built into the quoted price	You’re under contract on a normal timeline
Extended lock	60 – 90 days	A pricing adjustment that grows with the window	Closing is two or more months out
Lock extension	7 – 30 added days	A fee or price hit, often billed per day or per 15-day block	Closing slipped and re-locking would price worse
Float-down option	Once during the lock	A fee or a slightly worse starting price	You want one shot at capturing a drop
New-construction long lock	90 – 360 days	The largest pricing adjustment of the five	Your build won’t finish for months

Four failure modes cause most of the unhappy lock conversations we sit in on:

• Lock expiration: If closing slips past the window, the rate is gone and the file re-prices at whatever the market is doing that morning. Know what happens if your lock expires before closing before you choose a window.
• Relock pricing: Lenders commonly relock at worst-case pricing, the higher of your original rate or the current market, so an expired lock rarely lets you capture an improvement.
• Float-down option: Typically available once per loan, and it usually requires the market to improve by a set minimum before it triggers. Availability and cost are lender policy, so ask for both in writing.
• Rate renegotiation: Some lenders will renegotiate when the market moves sharply, but that’s a discretionary concession, not a right you can plan around.

Here’s the part nobody enjoys hearing. Most extensions are billed to the borrower even when the delay wasn’t your fault, an appraiser booked three weeks out, a title problem surfacing on day 28. Your Loan Estimate won’t price an extension either, because it discloses the lock you have, not the one you might need. Lock terms are lender policy rather than regulation, so getting the extension schedule in writing before you commit is the actual protection, and the case for locking early is strongest when your timeline has slack in it. Our industry updates and rules hub tracks the pieces of this that do get set from above.

Discount points: How to run the break-even math

One discount point costs 1% of the loan amount and commonly lowers your rate by about 0.25%, but the CFPB is careful to say points have no fixed value in rate terms. Some days a point buys closer to 0.375%; other days it barely moves the number. Price it on the day you’re deciding, with the lender you’re actually using.

The math fits on a napkin. Divide the upfront cost of the points by the monthly payment savings, and the answer is your break-even in months. Everything after that month is profit; everything before it is a loss you already paid for.

Say you’re financing $300,000 on a Waterford purchase. One point costs $3,000. If it buys a quarter point of rate, your payment drops roughly $45 – $50 a month, putting your break-even near 60 – 65 months, right around five years.¹ Move or refinance inside that window and the $3,000 never comes back. That single disqualifier rules points out for a large share of buyers who assume a lower rate is automatically the better deal.

Three levers get confused constantly, and only one of them buys you rate:

• Discount points: Prepaid interest you choose to buy. They permanently lower the note rate and change what you pay every month for the life of the loan.
• Origination points: A lender fee priced as a percentage of the loan amount. Same 1% per point, but they buy nothing in rate. That’s compensation, not a discount, and it belongs in your closing cost comparison instead.
• Lender credits, or negative points: The mirror image of a discount point. You accept a higher rate and the lender pays money toward your closing costs. It’s the right call when cash to close is tighter than payment room, and it’s the lever most borrowers are never offered.

Points also distort quote comparison, because they move your annual percentage rate more than they move your note rate. Compare rate to rate first, then APR to APR, and only across quotes carrying the same lock period, our how mortgage rates work hub covers why those two numbers diverge and what each one is good for.

Temporary vs. permanent buydowns: 2-1, 3-2-1, and seller-paid options

A permanent buydown lowers your rate for the life of the loan; a temporary buydown lowers only your first one to three years of payments before stepping back to the note rate. That distinction drives everything else about mortgage rate buydowns, including who benefits and who should walk away.

Here’s the mechanic almost nobody explains. On a temporary buydown, the funds are deposited into a custodial account, held separately from the lender’s own money, and released monthly to cover the gap between your reduced payment and the full note payment. Your note rate never actually changed. That’s exactly why Fannie Mae’s Selling Guide (section B2-1.4-04) requires the lender to qualify you on the note rate without consideration of the bought-down rate, a temporary buydown lowers your early payments without expanding what you’re approved to borrow.

• 2-1 buydown: Year one sits two percentage points below the note rate, year two one point below, then the full note rate for the remaining term. The most common structure by a wide margin.
• 3-2-1 buydown: Three points below in year one, two in year two, one in year three. Agency rules cap the buydown period at three years and the rate reduction at 3%, with increases of no more than 1% in any one-year interval, so 3-2-1 sits at the outer edge of what’s allowed.
• 1-0 buydown: One point below the note rate for a single year. Cheaper for whoever funds it, and common when a seller wants to help without writing a large concession.
• Who pays: Sellers and builders fund most of them, and when an interested party pays, agency contribution limits apply for a primary residence or second home, 3% of the lower of sales price or appraised value above 90% loan-to-value, 6% between 75.01% and 90%, and 9% at 75% or below. A funded buydown often beats an equivalent seller-paid price cut, because the whole concession lands in the years your payment is tightest.¹
• If you pay off early: When the loan is refinanced or paid off before the buydown runs out, the remaining funds are generally credited toward the payoff or returned under the terms of the buydown agreement. Confirm which applies to you, and weigh it against refinancing closing costs before you plan on a quick refinance.

Used well, a temporary buydown is a bridge across the first year or two while income grows. Used badly, it sells a payment nobody can carry in year three. Government-backed programs allow buydowns under their own agency rules, so confirm the structure before it goes into an offer. Our buydown guide covers what a 2-1 buydown actually saves you in year one and who’s allowed to fund it.

Lock or float? How to decide

For most borrowers, locking is the right default, because the downside of a rate spike is larger than the upside of a small improvement, and because nobody forecasts the bond market reliably, including the people paid to.

Locking usually makes sense if:

• You’re closing inside 30 days on a timeline you believe.
• Your payment already sits at the edge of your comfort zone, so an upward move breaks the budget.
• No float-down is available, which means floating gives you all of the downside and none of the recovery.

Floating may make sense if:

• You’re on a long new-construction timeline where an extended lock prices expensively anyway.
• Your file is strong and your budget can absorb a move against you without changing what you buy.
• You have a float-down in writing, with the trigger threshold and the fee spelled out.

Worth saying plainly: no rate strategy beats a smaller loan amount or a stronger file. Points, locks, and buydowns move your payment at the margins, while a better credit score and a larger down payment move it structurally, and choosing between loan structures, like a fixed-rate mortgage and an ARM, changes more than any lock decision will. Holding off is always a legitimate option too.

From the broker side, float-downs get exercised on only a small share of the files where they’re offered, because the market has to clear the trigger threshold first. What shows up reliably is lender competition: across Align Lending’s network of 75+ wholesale lenders, the spread between the best and worst quote on the same borrower’s file has averaged about 0.375%. That’s rate strategy too, and it’s the piece you control on the day you apply rather than the day you lock.

For a market read rather than a prediction, use a survey source instead of an advertised rate. Freddie Mac’s Primary Mortgage Market Survey has published weekly averages since April 1971 and releases each Thursday. Treat it as a thermometer, not a quote, since your file will price above or below it. Our mortgage market update and the indicators in our housing market trends hub add context, the impact of mortgage rate volatility explains why choppy weeks strand unlocked borrowers, and our guide to mortgage rates and the housing market covers what sets the baseline in the first place.

What Michigan buyers should know

Rate strategy is national, but three Michigan realities change which lever you should pull.

• Michigan winters stretch timelines, which makes lock length a real decision: Frozen-ground appraisals, snow-covered roof inspections, and exterior-completion escrow holdbacks push November-through-March closings past 30 days far more often than summer closings do. Budget a 45-day lock instead of a 30. The pricing difference on the front end is almost always smaller than an extension fee on the back end.
• MSHDA changes the question you’re asking: The Michigan State Housing Development Authority runs the MI Home Loan for first-time buyers statewide and repeat buyers in targeted areas, with a 640 minimum credit score plus income and sales price limits that MSHDA resets periodically, confirm the current limits on MSHDA’s site rather than from any article, including this one. Paired with the MI 10K DPA, up to $10,000 as a 0%, non-amortizing second mortgage due on sale or transfer, the comparison stops being “which lender is cheapest” and becomes “does the program rate plus the assistance beat the best conventional or government quote once the assistance is counted?” MSHDA’s programs and pilots also open and close as funding allows, so check what’s currently available before you build a plan around it, and see our assistance programs hub for how the pieces stack.
• Builder buydowns are common in Michigan’s new-construction submarkets: In Oakland, Livingston, and Ottawa county new builds, builder-funded 2-1 buydowns and extended locks are frequently available but rarely advertised. Ask before you sign the purchase agreement, because a funded buydown is a negotiation item, not a lender product, and it competes for the same contribution room the agency limits cap at 3% to 9% of the price depending on your down payment.

FAQ: Mortgage rate locks, points, and buydowns

Here are answers to common questions about locking and buying down your mortgage rate.

What happens if rates drop after I lock my rate?

Usually nothing, you keep the locked rate. That is the tradeoff a lock makes. The exception is a float-down option, which many lenders offer once per loan when rates improve by a set minimum, typically for a fee or a small price adjustment. Ask whether a float-down is available and get the trigger threshold in writing before you lock, not after. And treat any expectation of a drop as a scenario, not a plan, our guide to mortgage rate predictions explains why forecasters miss.

Does locking a mortgage rate cost money?

Not usually as a separate fee, but it is priced in. Standard locks of 30 – 60 days are typically built into the quote, while longer locks, extensions, and float-down options are paid for through slightly worse pricing or an explicit charge. Extensions are the one to watch. Most are billed to the borrower even when the delay came from the appraiser or the seller. Most of those delays trace back to one step, so read our walkthrough of the home appraisal process before you pick a lock window.

Do I qualify based on the buydown rate or the full note rate?

The full note rate. On a temporary buydown, the escrowed funds subsidize your first 1 – 3 years of payments, but underwriting still qualifies you at the permanent note rate, so a 2-1 buydown lowers your early payments without expanding what you can borrow. A permanent buydown with discount points does lower the qualifying rate. Because underwriting uses the note rate, your debt-to-income ratio (DTI) is what actually caps the loan amount.

Can I switch lenders after I’ve locked a rate?

Yes, until you close. A rate lock is a lender commitment to you, not a contract binding you to them, so you can move the file if a competing quote is meaningfully better. Weigh the real costs: a new appraisal may be required, the application restarts, and you may lose an appraisal fee. Compare the total, not just the rate. Line the two offers up on annual percentage rate (APR) and confirm both carry the same lock period.

The bottom line on rate strategy: Lock to remove risk, buy points only if you’ll stay

Rate strategy comes down to three decisions. Lock your rate for a defined window, typically 30, 45, or 60 days, and treat the lock as insurance rather than a market call, because extensions get billed to you and relocks price at worst case. Buy discount points only when you’ll hold the loan past the break-even: one point costs 1% of the loan amount, commonly buys about 0.25% of rate, and takes roughly five to six years to recover. And take a temporary buydown when a seller or builder funds it, remembering that you still qualify at the full note rate.

If you’re ready to decide whether to lock, float, or buy down, talk to Align Lending, we’ll price all three across our lender network and show you the break-even math on your actual loan amount. Call 248-506-5727 or start online today.

¹ Example figures are hypothetical and for educational purposes only; they do not constitute an advertisement of credit terms or a rate quote under federal or state lending laws. Your rate and terms will depend on your application and market conditions. Back to text

This article is for informational purposes only and is not intended to provide legal, financial, or tax advice. Consult a qualified professional about your situation. Lock windows, extension pricing, float-down availability, and buydown structures are set by individual lenders in Align Lending’s wholesale network, not by Align Lending. Align Lending is an independent mortgage broker licensed in Michigan, NMLS #2041154, works with FHA- and VA-approved lenders, and is not acting on behalf of, endorsed by, or sponsored by FHA, HUD, or the Department of Veterans Affairs.