Tool
Repayment capacity calculator
Apply the 30%-of-income rule — adjustable between 20% and 40% — to estimate how much you can put toward a new monthly payment after subtracting what you already pay.
Available for a new monthly payment
—
Recommended headroom, after subtracting your debts
Conservative limit (20%)—
Target limit (30%)—
Already committed—
Available headroom—
Assumptions & method
- Reference rule: your total debt payments should not exceed 30% of your net income (adjustable range of 20% to 40%, depending on your profile). It is a prudent guide, not a legal requirement.
- "Available" = income × target percentage − current debt payments.
- Use your net and stable income; do not include one-off income.
- Everyone is different: fixed expenses, dependents, and job stability change what a healthy margin looks like. Use it as guidance.
Frequently asked questions
The essentials, in brief
Why 30% and not more?
It is a prudent starting point that most origination criteria consider sustainable: it leaves room for living expenses, contingencies, and savings. The 20% to 40% range lets you tailor it to your situation: 20% if your income is variable, up to 40% if you have solid collateral and low expenses.
Does my rent or home mortgage count?
For a conservative reading, yes: include all your fixed monthly commitments. Some models separate housing from the rest; here we use a simple rule applied to the total debt you enter.
Does this determine whether I get approved for a loan?
No. It is a guide for you. The credit decision also considers collateral, credit history, loan purpose, and income stability. At Tunton we review it case by case.
Next step
Tell us about your deal
Tell us how much you need and what collateral you can offer. We'll tell you frankly whether it's viable and how we'd structure it.
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