Rate Direct

A rate lock is a lender's guarantee that your interest rate will not change for a specified period, regardless of market movements. Once locked, your rate is protected even if rates increase — but you also cannot benefit if rates decrease (unless you have a float-down option). Understanding rate lock mechanics, timing, and strategy can save you thousands or prevent a costly mistake.

How Rate Locks Work

When you lock your rate, the lender commits to holding that rate and associated pricing for a set number of days — typically 15, 30, 45, or 60 days. The rate is locked based on current market pricing at the time of the lock. Shorter lock periods cost less (or offer slightly better rates) because the lender faces less risk of rate movement. Longer locks carry a small premium, typically 0.125% per additional 15-day extension. The lock also includes the points/credits structure — so if you lock at 6.5% with 0.5 points, both the rate and the points are guaranteed.

When to Lock

Lock your rate when you have an accepted purchase contract and are within your closing timeline, when you are comfortable with the current rate relative to your financial plan, or when market conditions suggest rates may rise (rising Treasury yields, hawkish Federal Reserve statements, strong economic data). For purchases, most buyers lock within a few days of going under contract. For refinances, timing is more flexible — you can wait for a rate dip before locking. The general advice is to lock when you are satisfied with the rate rather than trying to time the absolute bottom. Rates are unpredictable in the short term, and the risk of waiting and seeing rates increase usually outweighs the potential savings from a small further decrease.

Float-Down Options

A float-down (also called a renegotiation) allows you to lower your locked rate if market rates drop before closing. Not all lenders offer float-downs, and those that do typically charge for the option — either as a slightly higher initial rate or an explicit fee. Common float-down rules: rates must drop by at least 0.25-0.50% to trigger the option, the float-down can only be exercised once, and it must be exercised a certain number of days before closing. The float-down typically adjusts to the current market rate, not the full drop — you might get half the improvement. Ask about float-down terms before locking, especially for longer lock periods.

What Happens If Your Lock Expires

If your closing extends beyond the lock period, the lock expires and your rate is no longer guaranteed. You have two options: extend the lock (most lenders charge 0.125-0.25% per extension period of 7-15 days) or re-lock at current market rates. If rates have increased since your original lock, extending is cheaper. If rates have decreased, re-locking gives you the better current rate. To avoid extensions, choose a lock period that provides a comfortable buffer beyond your expected closing date. If the lender caused the delay, you may be able to negotiate a free extension.

Lock Timing Strategy

In a rising rate environment, lock early — every day of floating adds risk. In a falling rate environment, you might float longer, but set a target rate and lock when it hits — do not chase the absolute bottom. In a stable rate environment, lock when convenient and focus on other aspects of the deal. Watch for rate-moving events: Federal Reserve meetings, jobs reports (first Friday of each month), CPI/inflation data, and geopolitical events can all cause significant rate swings. If a major event is upcoming and you are happy with your rate, lock before the announcement. Use Rate Direct to monitor real-time rates and identify favorable pricing before committing to a lock.

Common Mistakes

Floating too long hoping for a lower rate, then locking in panic when rates spike. Choosing a lock period that is too short, requiring a costly extension. Not understanding that your rate and points are a package — a slightly higher rate with a lender credit may be better than a lower rate with points if your plans might change. Forgetting to confirm your lock in writing — verbal locks are not enforceable. Changing loan parameters after locking (switching from 30-year to 15-year, adding cash-out, changing the loan amount) — these changes may void your lock. Always get your lock confirmation in writing with the rate, points, lock period, and expiration date clearly stated.