Loan Affordability With Family Calculator

Work out loan affordability with family instantly with clear inputs, formula shown and shareable results.

About Loan Affordability With Family Calculator

Lenders cap total instalments at a share of income, and each dependant reduces the share prudently available because household running costs rise. Existing commitments are deducted before the remaining capacity is converted into a loan amount.

Formula

Family-adjusted affordability

Allowed share = 50% - 3% per dependant; loan = (income × share - existing EMIs) × annuity factor

Worked example

With the default values below, Loan Affordability With Family Calculator returns Loan You Could Support Over 20 Years of $5,522,169. Change any input above and every figure here is recalculated in your browser.

Inputs used

Monthly Household Incomeminimum 0: 180,000
Existing Monthly Loan Paymentsminimum 0: 25,000
Dependantsaccepts 0–10: 3
Interest Rateaccepts 0–100 %: 8.75 %

Results

Loan You Could Support Over 20 Years: $5,522,169
Instalment Capacity Available: $48,800.00
Share Of Income Allowed For Debt: 41.00%
Share Already Committed: 13.889%

Step by step

1Values used
2Family-adjusted affordability
3Loan You Could Support Over 20 Years= 5,522,169
4Instalment Capacity Available= 48,800.00
5Share Of Income Allowed For Debt= 41.00
6Share Already Committed= 13.889

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Figures are estimates for planning only. Prices, returns, inflation and personal circumstances all change. This is not financial or tax advice — speak to a qualified adviser before making decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates for planning only. Prices, returns, inflation and personal circumstances all change. This is not financial or tax advice — speak to a qualified adviser before making decisions.

Frequently Asked Questions

Why reduce the ratio for dependants?

Because essential household spending rises with family size, leaving less genuinely available for debt service.

Is the maximum affordable loan the right loan?

Rarely. Borrowing at the ceiling leaves no margin for rate rises or income interruption.