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Construction To Perm Rate Gap Calculator

Construction to permanent transitions often carry meaningful rate gaps.

Loan balance

Construction rate %

Permanent rate %

Construction months

Permanent term years

Rate gap cumulative impact

$900,000

Monthly payment difference

$50,000

Annual savings at perm

$600,000

How the math works

Impact = balance × (construction − perm rate) × (months/12). Annual savings after transition = balance × gap.

$40M × 1.5% × 1.5 yr = $900k extra cost during construction. $600k/yr savings after transitioning to perm.

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 Construction To Perm Rate Gap Calculator is built to give a quick, browser-based estimate for construction to perm rate gap. Construction to permanent transitions often carry meaningful rate gaps. 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 construction to perm rate 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 construction to perm rate 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 construction loan balance.
Enter construction rate %.
Enter permanent rate %.
Enter construction months.
Enter permanent term years.
Read rate gap impact.

Frequently Asked Questions

Why is there a rate gap?

Construction loans carry higher rates (7-10% in current market) because of construction risk (cost overrun, schedule delay, completion default). Permanent loans carry lower rates (5-7%) because stabilized asset with cash flow. At construction completion, borrower refinances to permanent — often at 150-300 bps lower rate. Rate gap is the cost of construction risk period.

When does refi happen?

At substantial completion + stabilization: typically 12-24 months post-groundbreaking. Some markets lock perm rate at construction loan closing (mini-perm or construction-to-perm combined facility). Others float — perm rate available at completion. Institutional sponsors use rate locks at closing when rate environment is favorable; take floating risk when environment is negative (better perm rate expected).

Mini-perm vs construction loan + perm?

Mini-perm: combined construction + 3-5 year permanent facility with single lender, single set of docs. Simpler, sometimes higher all-in cost. Construction loan + separate perm: different lenders, different docs, more complex but often better pricing. Large projects ($50M+) usually do separate; small projects ($10-25M) sometimes combine. Either way, plan the rate gap.

Rate lock economics?

Locking perm rate at construction close: extends exposure to today's perm rate for entire construction period. Premium: 25-100 bps over spot rate. Hedge strategy if rates expected to rise. Floating: accept market rate at completion. Rate cap: buy optionality to floor rate at strike (if rates fall, take spot; if rise, cap kicks in). Cost: 1-3% of notional. Each approach has risks worth stress-testing.