Wire fraud is the most expensive fraud a bank or its customers will experience, for one structural reason: wires are final. There is no chargeback, no return window, and no right of recall. Recovery depends entirely on the receiving institution and the beneficiary choosing to cooperate, and on speed measured in hours.

That finality means prevention is essentially the whole control. Detection after the fact is a recovery effort, not a control.

How It Actually

Fraud prevention at a bank is not one program. It is a set of controls spread across deposit operations, lending, payments, information security, and human resources, and the losses concentrate wherever those functions hand off to each other without anyone owning the seam.

This guide maps the whole landscape — what the categories are, where money actually leaves, what controls work, and how to structure a response.

The Categories

Fraud against banks divides into

Debt-to-income is the most consequential arithmetic in consumer lending, and the arithmetic is trivial. What is not trivial is deciding what belongs in each half of the fraction — and that is where files get denied, approvals get overturned, and repurchase demands originate.

The Two Ratios

Front-end ratio (housing ratio) — the proposed total housing payment divided by qualifying monthly gross income.

Back-end ratio (total debt

Loan documentation is the part of lending nobody thinks about until it matters, and when it matters the institution is usually in a workout, a bankruptcy, or an examination. At that point the documents either support the bank's position or they do not, and nothing can be fixed retroactively.

The governing principle is simple to state and hard to enforce: the file must support the bank's rights against the borrower, against the collateral, and against competing creditors —

FHA lending is where a bank serves borrowers who cannot fit a conventional box — thinner credit, less down payment, higher debt ratios — with the government insuring the loss. That insurance is the whole product, and it comes with a rulebook.

The governing document is HUD Handbook 4000.1, the Single Family Housing Policy Handbook. It is the authority, it is searchable, and any FHA lender should be working from it rather than from institutional memory.

What

Commercial underwriting is a written argument. The analysis is not finished when the ratios are calculated; it is finished when a reader who has never met the borrower can follow the reasoning from the financial statements to the recommendation and understand what would have to go wrong for the loan to fail.

This is the process in the order it is actually performed.

Step 1: Understand the Request Before Touching the Numbers

Three questions, answered before any

OFAC compliance is routinely taught alongside BSA/AML and is fundamentally different from it. The BSA asks you to detect and report. Sanctions ask you to stop — and they impose strict liability, with no suspicion standard, no dollar threshold, and no requirement that anyone intended anything.

An institution that processes a single prohibited transaction has violated sanctions law, whether or not its program was reasonable and whether or not anyone was negligent. That ...

Fair lending is the area of compliance where an institution can violate the law without a single employee intending to. The two governing statutes reach not only deliberate discrimination but also neutral policies that produce discriminatory outcomes, and the evidence used to prove a violation is usually the institution's own data.

The Two Statutes

The Equal Credit Opportunity Act, implemented by Regulation B, applies to all credit —