The Student Aid Index (SAI): What Your FAFSA Number Means

Every page on this site that says “file the FAFSA” leads here. The FAFSA’s output is a single number called the Student Aid Index, and understanding what it is, and is not, explains most of what happens next in the aid process. This page describes the federal need-analysis system as Federal Student Aid documents it; it is not a prediction of your aid.

What the SAI is

The Student Aid Index is the number the federal need-analysis formula produces from your FAFSA.¹ Schools subtract it from their cost of attendance to measure your financial need:

Cost of attendance minus SAI = financial need

That need figure is what a financial aid office works from when it assembles your offer of grants, work-study, and loans. The SAI is an eligibility index, not a price: it is not what you will pay, and it is not a bill. What you actually pay is the school’s cost of attendance minus the grants and scholarships you receive, which is exactly the net price figure our school pages report for past students.

SAI replaced the EFC

Starting with the 2024-25 aid year, the FAFSA Simplification Act replaced the Expected Family Contribution (EFC) with the SAI.¹ The changes were more than a rename:

• The SAI can be negative, as low as -1,500.² A negative SAI signals the highest level of need; the EFC bottomed out at zero and could not distinguish among high-need families.
• The number of children in college at the same time no longer divides the figure. Under the EFC, two children in college roughly halved each one’s expected contribution; the published SAI formula contains no such adjustment.²
• Fewer questions, more imported data. Income comes directly from IRS records through the FAFSA’s data exchange for most filers, rather than self-reported line by line.
• Pell Grant eligibility is now tied to the SAI and to family size relative to the federal poverty guidelines, which made Pell eligibility more predictable in advance.² Our Pell Grant guide covers the details.

What drives the number

The formula weighs parent and student income most heavily, then assets, family size, and household structure. Details that commonly surprise families, all from the published federal methodology:

• Whose information counts depends on dependency status. Most students under 24 are dependent for FAFSA purposes regardless of who pays their bills; FAFSA for independent students covers the exceptions that matter to adult learners.
• Retirement account balances are not reported assets. Deductible retirement contributions made in the reporting year count as income in the formula, but the balances themselves do not appear on the FAFSA.²
• The income data is two years old. The formula uses prior-prior tax year income (the 2027-28 FAFSA uses 2025 income).² If your finances have changed substantially since then, schools can exercise professional judgment; you have to ask.

What to do with this

1. File the FAFSA regardless of what you expect the number to be. It is the gate for Pell Grants, federal loans, work-study, and most state and institutional aid, and many schools require it for merit aid too.
2. Do not treat the SAI as your price. Two schools can see the same SAI and produce offers thousands of dollars apart, because grant budgets differ. That gap is visible in the net price by income bracket figures on every school page here.
3. Compare offers on grants, not totals. An offer that closes the gap with loans has not lowered your cost. Our guide to federal student loan basics explains each loan line, including the borrowing caps that took effect in July 2026.

The official definition and the full formula documentation live at studentaid.gov, and the Federal Register publishes the complete need-analysis tables each aid year.