Finance category
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Spread Lock Calculator
Spread lock guarantees the spread (not absolute rate) over an index at closing. This calculator estimates the lock fee and evaluates value vs rate movement risk.
Lock fee
$40,000
Value locked in (bps)
25
Annual savings vs expected
$25,000
How the math works
Spread lock = fixed margin over index regardless of market spread movement. Fee pays for lender's risk of spread widening during lock period.
Sound when you have a spread view — if you think spreads will widen, lock now. If you think they'll tighten, don't. Most commercial locks get exercised when spreads widen.
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 Spread Lock Calculator is built to give a quick, browser-based estimate for spread lock. Spread lock guarantees the spread (not absolute rate) over an index at closing. This calculator estimates the lock fee and evaluates value vs rate movement 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 spread lock 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 spread lock 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 loan amount.
- Enter spread at lock.
- Enter expected spread at commitment.
- Enter lock period days.
- Read lock fee and break-even movement.
Frequently Asked Questions
When is spread lock used?
CMBS, life insurance permanent, agency multifamily. Borrower locks spread to Treasury/SOFR; index moves with market, so final rate isn't fixed — but spread is.
Typical fee?
0.25-0.50% of loan for 30-60 day lock. Longer locks (90-180 days) cost 0.75-1.50%. Fee paid upfront and often forfeitable if deal falls through.
Better than full rate lock?
Cheaper than full rate lock (which also locks index). Rate lock costs 1-3%. Spread lock is cheaper because borrower still bears index risk.
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