Takeout Rate Lock Gap Calculator

Lock gaps create refi shock risk.

Perm loan amount

Base takeout rate %

Months to lock

Rate move expected bps

Annual interest increase

$135,000

Base annual interest

$1,170,000

Increased annual interest

$1,305,000

How the math works

Base = loan × rate. Increased = loan × (rate + move). Annual increase = difference.

$18M × 6.5% = $1.17M base. +75 bps → $1.305M. $135k/yr increase — meaningful DSCR impact.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Takeout Rate Lock Gap Calculator is built to give a quick, browser-based estimate for takeout rate lock gap. Lock gaps create refi shock risk. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the takeout rate lock gap result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this takeout rate lock gap estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter perm loan amount.
Enter base takeout rate %.
Enter months to lock.
Enter rate move expected bps.
Read annual interest at each rate.

Frequently Asked Questions

What's the lock gap?

Construction loan signed today. Perm takeout rate locked at different date (30-day, 60-day, forward commitment). Gap creates rate exposure: rate moves up = higher perm rate = lower DSCR = potential takeout failure. Standard industry risk.

Managing gap?

Forward commitment (lock rate now for future close): 25-75 bps premium. Rate caps during gap. Construction-to-perm one-close: eliminates gap but single lender required. Interest rate hedges (swaps, caps): flexible but cost 0.5-2%.

Current climate?

Rising rate environment: gaps create real pain. 2022-23: many construction projects saw 150-300 bps rate moves during gap period. Perm takeout rates exceeded DSCR covenants; loans defaulted or required sponsor equity paydown. Lock earlier in rising rate markets.