Lease Default Probability Calculator

Score tenant default probability using rent-to-income, credit, tenure, and deposit. Gets to a one-year default probability.

Rent-to-income %

Credit score

Prior tenure months

Deposit coverage months

Default probability

2.65%

Risk band

Low

Recommendation

Standard terms

How the math works

Score combines rent burden, credit, tenure, deposit. Each lever maps to a default-rate lift over base.

Use as rank-ordering tool, not absolute predictor. Your rejection rate trades off with lease-up speed. A/B test threshold changes against 90-day delinquency data.

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 Lease Default Probability Calculator is built to give a quick, browser-based estimate for lease default probability. Score tenant default probability using rent-to-income, credit, tenure, and deposit. Gets to a one-year default probability. 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 lease default probability 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 lease default probability 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 rent-to-income ratio.
Enter credit score.
Enter tenure months.
Enter deposit coverage months.
Read default probability.

Frequently Asked Questions

What drives default?

Rent burden over 40% of income is strongest single driver. Credit score < 600 doubles base rate. Under 6 months tenure = new-tenant risk. Thin deposits remove buffer.

Model limits?

This is a heuristic scoring tool, not underwriting software. Real defaults also involve job loss, medical, family — things you can't measure. Use as relative ranker.

When to reject?

Probability over 10% = reject or require cosigner. 5-10% = require 2-month deposit. Under 5% = standard terms. Tune thresholds to local market.

What documentation matters here?

Written leases, move-in/move-out inspections with photographs, ledger entries showing every payment and charge, served notices with proof of service, and contemporaneous emails or texts. Courts weigh written evidence heavily; informal understandings rarely stand. Institutional operators run a monthly file audit to catch gaps before they matter. Good paper trails recover most of what's owed.