FAFSA Student Aid Index (SAI) Forecaster

Core SAI Formulas (Simplified)

In simplified form, the SAI is the sum of a parent contribution and a student contribution. Each contribution is built from two pieces: available income and available assets.

• Parent available income = parent income minus allowances (taxes, basic living needs, and certain deductions).
• Parent available assets = parent reportable assets minus the parent asset protection allowance.
• Student available income = student income minus a standard student income protection allowance.
• Student available assets = student reportable assets (no asset protection in this simplified model).

Our calculator then applies assessment rates to each part to estimate how much of that income or assets is expected to be available for college.

High-level computation steps

In words, the tool follows these steps:

1. Estimate parent available income by subtracting federal income tax paid, other allowable deductions, and an income protection allowance (based on household size and number in college) from parent adjusted gross income (AGI).
2. Apply a 47% assessment rate to positive parent available income to get the parent income contribution.
3. Subtract the parent asset protection allowance from parent reportable assets and assess any remaining amount at 12% to get the parent asset contribution.
4. Add the parent income and asset contributions together and divide by the number of family members in college to share the expected parent contribution across students.
5. Estimate student available income by subtracting student federal income tax and a $7,200 income protection allowance from student AGI.
6. Assess student available income at 50% and student reportable assets at 20% to obtain the student contribution.
7. Add the parent and student contributions to generate the forecasted SAI. If the result is very low, it may be negative; under current rules, the official SAI can be as low as −$1,500.

Formula in symbolic form

Let:

• P_AGI = parent adjusted gross income
• P_tax = parent federal income tax paid
• P_ded = other allowable parent deductions
• IPA = parent income protection allowance (depends on family size and number in college)
• P_asset = parent reportable assets
• P_APA = parent asset protection allowance
• S_AGI = student adjusted gross income
• S_tax = student federal income tax paid
• S_asset = student reportable assets

Then, using a student income protection allowance of $7,200, the core relationships can be represented in MathML as:

Where the intermediate quantities are:

• P AI_p (parent available income) ≈ P_AGI − P_tax − P_ded − IPA
• P AA_p (parent available assets) ≈ P_asset − P_APA
• S AI_s (student available income) ≈ S_AGI − S_tax − 7,200

This layout is simplified for clarity and does not show every nuance in the official statutory formula, but it captures the core mechanics that drive the forecaster.

How to Interpret Your Estimated SAI

When you run the calculator, you will see a single SAI number. On its own, that number is not the amount you will pay for college or the amount of aid you will receive. Instead, colleges compare your SAI to their own cost of attendance (COA) to estimate your financial need:

Estimated financial need ≈ COA − SAI

Some broad interpretation guidelines:

• Negative SAI: Indicates very high financial need. Under current rules, the minimum official SAI is −$1,500. A negative value generally qualifies you for maximum federal Pell Grant eligibility, subject to other rules.
• Low positive SAI: Suggests substantial financial need. You may qualify for a mix of grants, subsidized loans, and work-study, depending on the school’s cost and policies.
• Moderate SAI: Indicates that the family is expected to cover a significant share of costs. You may still receive some need-based aid, especially at higher-cost institutions.
• High SAI: Suggests limited or no need-based aid at many schools. Merit scholarships and non-need-based programs may be more relevant.

Two families can have the same SAI but very different aid offers because each college has its own published costs and institutional aid rules. Use your estimated SAI as a planning tool, not a guarantee.

Worked Example: Estimating an SAI

Consider a family with the following profile:

• Parent AGI: $95,000
• Parent federal income tax paid: $7,500
• Household size: 4 (including the student)
• Number in college: 1
• Parent reportable assets: $45,000
• Parent asset protection allowance: $9,000
• Student AGI: $6,500
• Student federal income tax paid: $500
• Student reportable assets: $3,000
• Other allowable parent deductions: $4,000

The calculator uses a built-in income protection allowance based on household size and number in college. For illustration, assume the parent income protection allowance for a family of four with one in college is approximately $35,000 (this is a rounded value, not an official table entry).

1. Parent available income

Start with parent AGI and subtract taxes, other deductions, and the income protection allowance:

Parent available income ≈ 95,000 − 7,500 − 4,000 − 35,000 = 48,500

The calculator then assesses this at 47%:

Parent income contribution ≈ 0.47 × 48,500 ≈ 22,795

2. Parent available assets

Subtract the asset protection allowance from reportable assets:

Parent available assets ≈ 45,000 − 9,000 = 36,000

Assess at 12%:

Parent asset contribution ≈ 0.12 × 36,000 = 4,320

3. Parent contribution per student

Add the income and asset contributions and divide by the number in college (1 in this example):

Total parent contribution ≈ 22,795 + 4,320 = 27,115

Parent contribution per student ≈ 27,115 ÷ 1 = 27,115

4. Student contribution

First, student available income:

Student available income ≈ 6,500 − 500 − 7,200 = −1,200

Because this is negative, the calculator treats available income as zero:

Student income contribution ≈ 0.5 × max(−1,200, 0) = 0

Student asset contribution is 20% of reportable assets:

Student asset contribution ≈ 0.20 × 3,000 = 600

Total student contribution ≈ 600

5. Estimated SAI

Combine the parent and student contributions:

Estimated SAI ≈ 27,115 + 600 = 27,715

A family with this profile might see an estimated SAI around $27,700 using this simplified tool. At a college with a cost of attendance of $60,000, a rough estimate of financial need would be:

Estimated need ≈ 60,000 − 27,700 = 32,300

The actual aid package could be higher or lower depending on the school’s own methodology and available institutional funds.

SAI Ranges and What They May Indicate

The table below gives very general context for different SAI ranges. These ranges are illustrative only and are not guarantees of aid levels.

Always compare your estimated SAI to the published cost of attendance at each college you are considering. A given SAI will stretch much further at a community college than at a private university with higher tuition and fees.

Key Limitations and Assumptions

This SAI forecaster is intentionally simplified to make it easier and faster to use. As a result, there are several important limitations and assumptions you should understand before relying on the numbers.

• Unofficial estimate only: This tool is not affiliated with, endorsed by, or approved by the U.S. Department of Education, any state agency, or any college. Your official SAI will be calculated from your FAFSA data by federal systems and/or your school.
• Simplified income and asset rules: The calculator uses broad income protection allowances and flat assessment rates. The official formula includes more detailed tax allowances, employment expense allowances, and separate treatment for certain types of income.
• Limited asset categories: We treat all reportable parent and student assets in aggregate. The official FAFSA rules may exclude some small businesses, certain farm assets, and retirement accounts, and may treat other assets differently.
• No special circumstances: This forecaster does not adjust for unusual situations such as recent job loss, high unreimbursed medical expenses outside the standard tables, dependency overrides, or changes in family structure. Financial aid offices can sometimes consider these individually through a professional judgment process.
• Approximate allowances: Income protection and asset protection allowances used here are approximate and may not match the exact annual tables used by the Department of Education. Policy changes over time can also affect these values.
• Single-year snapshot: The calculator assumes that the income and asset information you enter reflects the tax year FAFSA will use. Large changes in income or assets from year to year can cause your official SAI to differ from what you see here.
• Institutional methodologies may differ: Some colleges, especially those with significant institutional aid, may supplement or modify the federal approach with their own formulas when awarding their own funds.

Because of these limitations, you should treat the output as a planning estimate—helpful for setting expectations and comparing schools, but not as a promise of any particular aid amount.

Using the Forecaster Effectively

To get the most useful results:

• Use income and tax numbers that match your federal tax return as closely as possible.
• Include only assets that FAFSA considers reportable (for example, do not include retirement accounts if they are excluded under current FAFSA rules).
• Run multiple scenarios if your income or assets might change—for example, if a parent expects a significant bonus, layoff, or retirement.
• Compare your estimated SAI with published costs at several colleges and look for net price calculators on school websites to refine your planning.

After you file the FAFSA and receive your official SAI and aid offers, you can come back to this tool to test “what-if” scenarios for future years, such as adding another student in college or paying down certain assets.