What counts as a minimum payment

Three numbers, all called the payment

On any given account there are three figures in circulation and they are rarely the same.

• The contractual minimum — the least the creditor will accept this month without treating the account as late.
• What you actually pay — often more, because you are trying to clear the balance.
• What the credit report says — a snapshot of the minimum as reported at the last update, which can be a month or more out of date.

Underwriting uses the third one. Not what you pay, not what you intend to pay, not what the balance suggests you ought to pay. Once you understand that, a great deal of otherwise strange lender behaviour becomes predictable.

How a card minimum is actually built

Credit card minimums are set by a formula written into your cardholder agreement, and the common shape is: a flat floor, or a small percentage of the balance plus that month's interest and fees, whichever is greater. The percentage is usually in the low single digits and the floor is usually a small round dollar amount. Both vary by issuer and by card, so the only reliable source is the agreement itself — look for a section headed "how we calculate your minimum payment", which issuers are required to disclose.

Two consequences follow from that structure and they matter more than the exact figures.

First, a card minimum moves with the balance. Pay a card down and the reported minimum falls the following cycle. This is the only debt type where a partial payment buys you any ratio improvement at all.

Second, a card minimum is mostly interest on a high-rate balance. Because the percentage component is applied to principal and the interest is added on top, the proportion of your minimum that actually reduces the debt shrinks as the rate rises. Paying the minimum on a high-rate card can take decades. Your statement carries a required disclosure box showing how long, which is the single most useful thing printed on it.

Instalment debt does not work that way

A car loan, personal loan or student loan has a fixed contractual payment. It is set at origination and it does not move when you pay extra. Send an additional $400 against a $520 car payment every month for a year and the reported minimum is still $520. You will clear the loan sooner, and you will have bought yourself nothing at all in ratio terms until the balance reaches zero.

This asymmetry is the whole reason payoff ordering matters when you are trying to qualify for something. On a card, part-payments count. On an instalment loan, only completion counts.

The cases where the underwriter substitutes a figure

Sometimes no usable minimum is reported, and guidance then tells the underwriter what to assume. The specifics differ by loan programme and change over time, but the recurring situations are these.

• A revolving account with no payment shown. Conventional guidance has directed underwriters to impute a percentage of the outstanding balance — the figure that has been used is 5% — unless you supply a statement showing the actual required payment. On a large balance that imputed figure can be several times the real minimum, so producing the statement is worth the ten minutes.
• Deferred or income-driven student loans. The most volatile item in the whole calculation. Some programmes accept a documented income-driven payment even when it is zero; others impute a percentage of the balance. The same loan can appear as nothing or as several hundred dollars a month depending on which desk the file lands on.
• Charge cards that must be paid in full each month. Frequently excluded, but usually only with documentation that the account is paid in full monthly, and sometimes only if you can show funds sufficient to clear it.
• Debt in someone else's name that you co-signed. Counted against you unless you can document twelve months of payments made by the other party from their own funds.
• Court-ordered payments. Child support, alimony and garnishments count even though they do not appear on a credit report at all.

None of these are universal. They vary by loan programme, by investor and by the individual lender's overlays, which is why the only binding answer is the one your loan officer gets back from the automated underwriting system on your actual file.

Why the minimum, and not the balance, decides it

Debt-to-income is a monthly cash-flow test. The question is whether your income covers the proposed housing payment plus everything else you are contractually required to pay each month. A balance is not a monthly obligation, so it never appears.

Turn that around and you get a usable test: cash required, divided by monthly payment removed. A small instalment loan with a large payment is the cheapest ratio you will ever buy. A large card balance with a small minimum is the most expensive. The payoff optimiser ranks your accounts on exactly that measure, and prices the option of putting the same money into the down payment instead.

Lowering a minimum on purpose

1. Clear small instalment loans outright. Whole payment removed, usually for modest cash. Check first whether the loan has few enough payments left to be excluded already — conventional files commonly disregard an instalment debt with ten or fewer payments remaining, and paying off something already ignored buys nothing.
2. Pay cards down rather than off, if cash is tight. The minimum falls with the balance, so a partial payment still moves the ratio.
3. Document, do not wait. Creditors report on their own cycle. A payoff letter or a zero-balance statement can usually be used directly rather than waiting a month for the bureau to catch up.
4. Ask about a rate reduction before you consolidate. A lower rate lowers the interest component of a card minimum. See issuer hardship programmes, which cost nothing.

And one thing to avoid: closing a card after you pay it off, at least until you have closed on the house. It removes available credit, raises your utilisation on what remains, and can move your score at the worst possible moment. Pay it, leave it open, put it in a drawer.