A borrower looks at their pay stub, looks at the income figure on their tax transcript, and sees two different numbers. The natural conclusion is that something is wrong.
Usually nothing is. The two documents are measuring different things, and the gap between them is both expected and explainable.
The Numbers Are Not Meant to Match
A pay stub shows what an employer paid. A tax return shows what is taxable. Those are different quantities, and several ordinary deductions sit between them.
Retirement contributions. Money paid into a traditional 401(k) or 403(b) is deducted before federal taxable wages are calculated. Someone earning 90,000 who contributes 9,000 to a 401(k) shows 81,000 in federal taxable wages, and the W-2 reflects that.
Health insurance premiums. Where premiums are paid through a cafeteria plan, they are deducted pre-tax and reduce taxable wages.
Health savings and flexible spending accounts. Contributions reduce taxable wages the same way.
Dependent care and transit benefits. Where offered pre-tax, these reduce the figure as well.
None of these are unusual. A borrower with an ordinary benefits package will often show taxable wages several thousand dollars below gross pay, and that is exactly what should happen.
The Boxes on a W-2 Do Not Agree With Each Other Either
This causes a great deal of confusion, and it is worth understanding.
Box 1 is federal taxable wages, after the pre-tax deductions above.
Box 3 is Social Security wages. It is not reduced by retirement contributions, though it is reduced by some other pre-tax items, and it stops at the annual Social Security wage base.
Box 5 is Medicare wages. It is also not reduced by retirement contributions, and it has no cap.
So a single W-2 routinely shows three different numbers for the same job in the same year. All three are correct. They measure different things.
Timing Is the Other Common Cause
Even where deductions are not the issue, timing frequently is.
Pay periods do not align with the calendar year. Work performed in late December and paid in early January belongs to the following tax year. On a weekly or bi-weekly schedule this can shift a meaningful sum.
A raise mid-year distorts an annualised estimate. A borrower earning 60,000 who received a raise to 72,000 in July does not show 72,000 on the return. They show roughly 66,000, and multiplying the current pay stub by twelve produces a number the return will never match.
Bonuses, commission and overtime fall unevenly. A strong bonus year followed by a weak one produces two very different returns for the same base salary.
Why a Lender Looks at Both
Given all this, it is reasonable to ask why a lender wants the transcript at all if the pay stub is more current.
The answer is that they answer different questions.
The pay stub answers what the borrower is earning now. The transcript answers what was actually reported to the federal government over a period, and it comes from the IRS rather than from the borrower. That independence is the point: a pay stub is provided by the applicant, and documents provided by applicants are the ones most often altered.
Together they establish both the current position and the reported history, and it is the relationship between them that underwriting is examining.
What Actually Signals a Problem
Not every difference is benign. The differences worth investigating tend to be these.
A gap that pre-tax deductions cannot account for. A few thousand dollars is ordinary. Thirty thousand is not, unless there is a specific and verifiable reason.
Income on the pay stub from an employer who does not appear on the transcript at all. A missing W-2 has explanations, but it needs one.
A pattern moving in the wrong direction. Stated income rising sharply while reported income falls is worth understanding before it is relied upon.
A recently issued pay stub from an employer with no reporting history. This is a common feature of fabricated employment.
Explaining It to a Borrower
Most borrowers who raise this are not attempting anything. They have noticed a genuine discrepancy and are worried it looks bad.
A short explanation usually settles it. The tax return shows taxable wages after pre-tax deductions such as retirement and health insurance, so it is normally lower than gross pay. The lender expects that, and is looking at the relationship between the documents rather than at whether two numbers are identical.
Delivered early, that saves a phone call and a great deal of anxiety on the borrower's part.