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Capacity
Capacity is a lender’s assessment of whether your income is sufficient to cover your existing debts and a new mortgage payment, one of the 5 C’s of Credit weighed in underwriting. Lenders measure it primarily through your debt service ratios and the mortgage stress test, rather than income alone.
Capacity Quick Facts
- One of the 5 C’s of Credit lenders assess
- Measures whether income can support debts and payments
- Calculated through GDS and TDS debt service ratios
- Tested against the federal mortgage stress test
- Distinct from character, which looks at debt repayment history
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What Is Capacity
Capacity is a lender’s measure of whether a borrower’s income is enough to comfortably cover their existing debts plus the payments on a new mortgage. It is calculated primarily through two debt service ratios, the gross debt service (GDS) ratio and the total debt service (TDS) ratio, which compare housing and total debt costs against gross income.
Every mortgage applicant must also qualify under the federal stress test, which requires proving capacity at a higher minimum qualifying rate (MQR) than the actual contract rate. Hence, a borrower’s capacity has to clear a buffer above what they will actually pay (actual monthly payments). This is meant to confirm capacity holds up even if interest rates rise or income tightens after the mortgage funds.
Capacity is distinct from character, another of the 5 C’s of Credit. Character looks backward at a borrower’s track record of repaying debt. Capacity looks at the present and near future, asking whether current income is sufficient for the obligations being taken on, regardless of how well past debts were managed.
Why Capacity Matters for Mortgages
For borrowers, capacity is often the single factor that sets the ceiling on how much mortgage they can qualify for, since even a borrower with excellent credit and a large down payment cannot be approved for an amount their income cannot support under the stress test.
For lenders, capacity is a forward-looking check that protects against approving a mortgage a borrower cannot realistically sustain, which is why it is calculated using standardized debt service ratios and a higher qualifying rate rather than left to judgment alone.
How Capacity Is Measured
Capacity is calculated through a set of standardized measures.
Gross debt service (GDS) ratio. Housing costs, including the mortgage payment, property taxes, and heating, measured against gross income, generally capped around 35% (uninsured mortgages) or 39% (insured or insurable mortgages).
Total debt service (TDS) ratio. All debt obligations, including housing costs plus other loans and credit payments, measured against gross income, generally capped around 42% (uninsured mortgages) or 44% (insured or insurable mortgages).
Stress-tested qualifying rate. Both debt service ratios are calculated using the minimum qualifying rate (MQR), which is the higher of the contract rate plus 2% or the benchmark rate (currently 5.25%), rather than the actual contract rate offered.
For example, a borrower earning $100,000 a year applies for a mortgage with a contract rate of 4.5%. Under the stress test, their capacity is calculated using a qualifying rate of 6.5% instead, which lowers the maximum mortgage amount they can qualify for compared to what the same income could support at the lower contract rate.
Common Mistakes and Misunderstandings About Capacity
- Assuming the contract rate, not the stress-tested qualifying rate, determines capacity
- Confusing capacity with character they measure different factors of creditworthiness
- Overlooking that other monthly debts also affect the TDS ratio
- Believing a high income alone guarantees strong capacity
- Forgetting that condo fees and property taxes count toward GDS
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Frequently Asked Questions (FAQ) About Capacity
What is capacity in the 5 C’s of Credit?
Capacity is a lender’s assessment of whether your income can support your existing debts and a new mortgage payment, one of the 5 C’s of Credit.
How is capacity calculated for a mortgage?
Capacity is calculated primarily through the gross debt service (GDS) and total debt service (TDS) ratios, both using the stress-tested qualifying rate rather than your contract rate.
What is the difference between GDS and TDS?
GDS measures housing costs alone against gross income. TDS measures housing costs plus all other debt payments against gross income.
Why does the stress test affect my capacity?
The stress test requires you to qualify at a higher rate than you will actually pay, which builds in a buffer and can lower your maximum qualifying mortgage amount.
What is the difference between capacity and character?
Capacity measures whether your current income can support your debts and payments. Character measures your historical track record of actually repaying debt.