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Process · 2026-10-09

Rate float vs lock: a decision tree for timing your commitment

Learn when to lock your mortgage rate versus when to float, based on your timeline, risk tolerance, and market conditions—a practical framework for timing your commitment.

You have rate quotes in hand and your loan is moving forward. Now comes the question: lock today or wait? The answer depends on four factors that form a straightforward decision tree.

Your timeline drives lock duration

Start with the days between now and your expected closing. Purchase contracts typically close in 30 to 45 days, so a 45-day lock gives cushion for appraisal delays or underwriting conditions. Refinances without a sale deadline can afford more flexibility—a 30-day lock may suffice if your file is clean, or you might choose 60 days if you're still gathering documents. Shorter locks often carry slightly better pricing than longer ones, but a lock that expires before closing forces an extension at prevailing rates, which can erase any initial savings.

These figures are illustrative; rates and products are subject to change and this is not a commitment to lend.

Risk tolerance and rate sensitivity

Next, assess how much a rate change matters to your budget. If a quarter-point move would strain your debt-to-income ratio or push your payment beyond comfort, locking early protects approval and peace of mind. If you have margin in your qualification and can absorb a modest increase, floating lets you capture improvement if rates drop. The Alliance take: volatility favors the certain. Markets can swing a half-point in a week during Federal Reserve cycles or jobs-report surprises, and no one predicts direction reliably.

Market conditions and momentum

Observe recent rate movement. If rates have climbed steadily for two weeks and economic data suggests further upward pressure, locking preserves the current level. If rates just spiked and technical indicators hint at a pullback, a short float—two to five business days—may be reasonable, provided your timeline allows it. Avoid wishful waiting; hoping for a full point drop while rates inch higher each day costs real money.

The decision path

Here is the framework in sequence:

  • · **Closing in under 30 days?** Lock immediately. You need rate certainty and cannot afford expiration risk.
  • · **Closing in 30–45 days with tight qualification?** Lock within the first week of application.
  • · **Closing in 45–60 days, comfortable margin, and rates stable or falling?** Consider a 7–10 day float, then lock into a 45-day period.
  • · **Refinance with no deadline and rates volatile?** Lock when you see a rate you are happy to live with for the loan's life—waiting for perfection often backfires.

Lock periods are not negotiable mid-stream without cost. Extensions typically add 0.125 to 0.250 percentage points per week, and re-locks at worse rates bind you to the new level.

The Alliance take

Rate timing is part strategy, part comfort. If locking today lets you sleep and plan confidently, that psychological value is worth capturing even if rates dip slightly later. If you genuinely have time and tolerance, a brief float is defensible—but set a date and lock when it arrives. The goal is a loan that closes on time at a rate that works, not a perfect guess at the market bottom. Start an application to discuss lock options that fit your specific timeline and contract.

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