VA loans use two qualification tests. Most people know the
debt-to-income ratio (DTI) limit of 41%. Fewer know about the
residual income requirement.
Residual income is the money left over each month after all
recurring debt payments. Not as a percentage of income, but as
an absolute dollar amount. The VA publishes regional thresholds
by family size. For Michigan, the Midwest table applies.
If your DTI-derived maximum purchase price doesn't leave enough
residual income, the loan won't qualify at that amount, even if
you are technically under 41% DTI. The binding constraint is
whichever limit is more restrictive.
The VA Affordability Calculator handles both limits simultaneously,
iterating to find the highest home price where both tests pass.