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Mini Perm Loan Calculator

Mini-perm loans bridge construction and long-term permanent financing. Short maturity (3-7 years), often with 1-2 years IO followed by amortization, and a balloon at maturity. This calculator computes the IO payment, the amortizing payment, and the balloon you'll need to refinance.

Loan amount

Interest rate

IO period (months)

Amortization after IO (years)

Maturity (years)

Amortizing monthly payment

$73,899

IO monthly payment

$62,500

Balloon at maturity

$9,541,398

Principal paid down over term

$458,602

First-year total payment

$750,000

How the math works

Mini-perm loans are 3-7 year CRE loans that bridge a construction loan and permanent financing. Often IO for 1-2 years followed by amortizing payment. At maturity, borrower refinances to long-term perm or extends. Popular when construction is stabilizing but not yet ready for agency or CMBS.

Balloon at maturity is what refinances. On lease-up deals, the balloon is sized assuming stabilized NOI drives the refinance — if lease-up stalls, the balloon can exceed refinanceable amount.

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 Mini Perm Loan Calculator is built to give a quick, browser-based estimate for mini perm loan. Mini-perm loans bridge construction and long-term permanent financing. Short maturity (3-7 years), often with 1-2 years IO followed by amortization, and a balloon at maturity. This calculator computes the IO payment, the amortizing payment, and the balloon you'll need to refinance. 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 mini perm loan 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 mini perm loan 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 and rate.
Enter IO period in months and amortization years.
Enter maturity in years.
Read monthly payment and balloon at maturity.

Frequently Asked Questions

When to use mini-perm?

Stabilizing asset not yet ready for 10-year CMBS. Sponsor wants short-term hold before sale. Bridge-to-agency transitions. Credit-tenant shopping centers waiting for anchor to open.

Rate premium?

Mini-perm is usually 50-150 bps above agency/CMBS — shorter term, fewer exit options for lender. Balloon risk means lender prices for early refinance or default.

Balloon refinance risk?

Big. If rates rise or NOI under-performs, the refinance loan sizes smaller than the balloon — borrower must write a check or default. Mini-perm only makes sense with a clear stabilization path and conservative pro forma.