Guide
The Student Aid Index
The Student Aid Index is the number that drives your federal financial aid calculation. This section explains how it is built, what moves it, and what it does not capture.
The Student Aid Index is a number the federal aid formula assigns to your family based on income, assets, and household size. Schools subtract it from their cost of attendance to find your financial need. A lower SAI produces more need; a negative SAI signals the greatest level of need.
The Student Aid Index sits at the center of federal financial aid. Once your family completes the FAFSA, the Department of Education runs the information through a formula and returns a single number — the SAI. Every school you applied to then subtracts that number from its cost of attendance to arrive at your demonstrated financial need. The formula itself is what this section is about: which numbers go in, how they are weighted, and what the result does and does not tell you.
The pages here are grouped around the formula's moving parts. Income, assets, family size, and the timing of the data each get their own treatment because they interact in ways that are not obvious. A family that changes its asset picture, adds a sibling to the household, or draws on a grandparent's account can see its SAI shift in ways that feel surprising — those surprises are explained here, not assumed away.
Work through this section in whatever order matches your question. If you are starting from scratch, the plain-English guide and the terms page build the foundation. If a specific figure surprised you — a retirement account, a 529, a business on the form — go directly to that page. The checklist at the end is designed to be used before you file, not after.
This section covers the SAI formula and its inputs only. How to file the FAFSA form lives in the How the FAFSA Works section; what happens to your SAI after schools receive it — including aid offers, appeals, and aid renewal — lives in Comparing Aid Offers, Aid Appeals and Special Circumstances, and Keeping Your Aid.
What you need to understand first
What the SAI actually measures
The SAI is not a bill and not a gap. It is the formula's estimate of how much a family can contribute to one year of school, based on the financial information reported on the FAFSA. Schools use it as an input to their own aid calculations; it does not by itself determine what a family pays or what aid is offered.
How need is calculated from the SAI
Each school subtracts your SAI from its own cost of attendance figure. That difference is your financial need as the school sees it. Because cost of attendance varies by school, the same SAI produces different need amounts at different institutions — which is why the SAI alone does not tell you what aid to expect.
Income versus assets in the formula
The formula treats income and assets differently. Income from the base year — a prior tax year, not the current one — carries more weight than assets. Assets are assessed at a lower rate, and some categories are excluded entirely. Understanding which number type is driving your SAI is the first step toward reading your result accurately.
The base year timing rule
The income the formula uses comes from a tax year that ended before the aid year begins. This means the FAFSA captures financial circumstances that may no longer reflect the family's situation. Knowing which year the formula is drawing from helps families understand both why aid looks the way it does and when the picture will update.
Negative SAI and what it signals
The SAI can be negative, which means the formula found that the family's resources fall below the baseline the formula considers minimal. A negative SAI does not guarantee a specific aid package; it signals the highest level of formula-defined need. What aid is actually offered depends on the school and the aid programs available to it.
SAI replaced EFC on 1 July 2026
Before 1 July 2026, the comparable figure was called the Expected Family Contribution, or EFC. The SAI uses a revised formula with different rules for certain asset and income categories. Families whose aid was calculated under the old formula and families whose aid is calculated under the new one are not directly comparable, and the change affects which rules apply to a given award year.
Mistakes to avoid with The Student Aid Index
Treating the SAI as the amount the family must pay
Why it happens: The phrase 'expected contribution' in the old EFC name led families to read the figure as a payment amount, and the habit persists with the SAI.
What to do instead: Read the SAI as an input to a school's calculation, not an invoice — your actual cost depends on the school's cost of attendance and the aid package it assembles, neither of which this number alone determines.
Assuming a high SAI means no aid is available
Why it happens: Families see a large SAI number, assume they exceed any threshold, and skip researching merit-based or institutional aid that does not use the SAI at all.
What to do instead: Contact each school's financial aid office to ask specifically which of their programs use the SAI as a criterion and which do not, before concluding aid is off the table.
Moving assets out of a student's name right before filing
Why it happens: Families learn that student assets are assessed at a higher rate than parent assets and shift funds close to the filing date, not realizing the formula looks at account ownership on the day the FAFSA is submitted and that aid offices can ask for documentation.
What to do instead: If asset placement is a consideration, discuss it with a fee-only financial aid advisor well before the filing window opens, so any changes reflect a genuine and defensible financial picture rather than a last-minute shift.
The Student Aid Index: common questions
What is a good SAI number?
There is no universally good or bad SAI. A lower number means the formula found more financial need, which can make a student eligible for more need-based aid — but what aid is actually available depends on each school's budget and programs. The number only matters in relation to a specific school's cost of attendance and what that school can offer.
Does the SAI change every year?
Yes. Each year you file the FAFSA, the formula recalculates your SAI using the income from the applicable base year and the assets reported at the time of filing. Changes in income, family size, savings balances, or the number of family members in college can all shift the number from one year to the next.
Why did my SAI go up when my income went down?
The formula uses income from a prior tax year, so a recent drop in earnings does not automatically lower your SAI until that year appears in the calculation. It can also rise if assets increased, if a sibling left college, or if the formula's weighting of a particular input changed. The base-year timing rule is the most common cause of this disconnect.
Do all schools use the SAI the same way?
No. All schools that participate in federal aid programs receive your SAI, but they apply it differently. Some schools meet all demonstrated need; others meet a portion. Some layer in their own institutional formula on top of the federal one. The SAI is a shared starting point, not a guarantee of any particular aid amount or package from any school.
Does a 529 savings plan hurt financial aid?
A 529 plan owned by a parent is counted as a parent asset in the formula, which is assessed at a lower rate than a student asset. The specific rate and how it compounds across the rest of your financial picture depends on the full formula calculation. The page on 529 plans in this section walks through how ownership and account type interact with the SAI.
What changed between EFC and SAI on July 1, 2026?
The SAI formula revised how certain income and asset categories are weighted, changed the way multiple children in college are treated, and introduced the possibility of a negative number — which was not possible under the old EFC. Students whose aid was first calculated before 1 July 2026 were under EFC rules; those calculated from that date forward use the SAI formula. The comparison page in this section covers the differences in detail.