Why Is My SAI So High? Run the 2027-28 FAFSA Formula Yourself With ChatGPT

Every Student Aid Index calculator ranking on the first page today is computing last year's number. I checked the top nine results for "how to calculate student aid index" on DuckDuckGo US on August 24, 2026: eight are calculator widgets and the ninth is a service page, every one of them stamped 2026-27 or older. The 2027-28 tables have been public since June 2, 2026. The title says ChatGPT because that is the search people actually run, the demonstration below is a Claude run, and the prompt works in either.

The Student Aid Index is the number the federal need analysis produces from your family's 2025 tax return and your assets. It replaced the Expected Family Contribution in 2024-25, and the rename was the point: it is an index a college subtracts from its cost of attendance to size your need. Nobody sends you a bill for it, and it predicts nothing about your final price. A school with a $90,000 sticker price and a school with a $28,000 sticker price read the same SAI and arrive at wildly different aid offers.

People trip on two of its properties. The number can go negative, all the way down to a floor of -1,500, which signals need deeper than the formula bothers to measure. And it carries no divisor for siblings in college, which was the single biggest break the old EFC ever gave families.

Why the calculators ranking today are computing the wrong year

The 2027-28 formula exists in full, and nobody has published against it. The Federal Register notice for the 2027-28 award year, FR Doc 2026-10986, appeared on June 2, 2026, and Federal Student Aid put out the complete 2027-28 Student Aid Index (SAI) and Pell Grant Eligibility Guide later that month. Every figure in this post comes from that PDF or that notice, read August 24, 2026.

Search for student aid index formula 2027-28 and nothing on the first page addresses 2027-28 at all. Search how to calculate student aid index and those nine slots go to sagecalculator.com twice, plus calcfi.app, financewonk.com and ustax.tools, sitting alongside finaid.org, MEFA, The College Investor and a college-planning service page. None of the nine shows you the formula or lets you check the arithmetic, which is a problem when the parameters move every year and the widget stays quiet about which year it loaded.

The changes go deeper than refreshed table values. The 2025 tax law excluded the net worth of a family-owned business with 100 or fewer full-time-equivalent employees, of a farm the family lives on, and of a family commercial fishing business, starting with 2026-27. Business income still counts; only the asset side changed. That same law added a hard ceiling: an applicant whose SAI reaches twice the maximum Pell award gets no Pell at all. A calculator built before August 2025 knows about none of it.

What to gather before you open the chatbot

Pull the 2025 return, because the 2027-28 FAFSA uses prior-prior year income. You need, for each parent and for the student: adjusted gross income, income tax paid, and income earned from work. That third line is the one people skip, and it sits some distance from AGI. Income earned from work drives the payroll tax allowance, and the two lines come apart in both directions: pre-tax 401(k) and HSA deferrals push AGI below your wages, while investment income pushes it above them. If a 1099 lands in your mailbox each January, the Q3 estimated tax run walks through where the Schedule C figures sit, and the W-4 audit covers the withholding line you will be reading off the return.

You also need untaxed portions of IRA distributions and IRA rollovers for each parent, family size, and state of residence. Family size is whatever the exemptions field on the tax return says, and the IRS data exchange hands that figure straight to the form.

Then the asset question, which is where the damage happens. Reportable parent assets are cash, savings and checking, plus net worth of investments. That last category includes brokerage accounts, real estate other than the home you live in, and any 529 the parents own, including plans for the student's siblings. If you are still deciding what to do with a plan balance, the leftover 529 walkthrough covers the exits.

What is never reportable: retirement account balances of any kind, the equity in your primary residence, the cash value of life insurance, and personal property. A 401(k) worth $400,000 does not appear anywhere on the form. The four-way comparison on an old 401(k) and the mid-year checkup both deal with accounts that are invisible to this calculation.

One number to fix in mind before you start. The Asset Protection Allowance for parents is $0 at every age from 25 through 65 and up, whether one parent or two. Guidance written in the EFC era still tells families the first several thousand dollars of assets is sheltered. That shelter is gone, and every reportable dollar now runs through the 12% conversion, so a $30,000 emergency fund adds $3,600 to your adjusted available income before the assessment bands have even started working on it.

Step 0: make the AI prove itself on the Education Department's own example

The formula guide publishes a fully worked exemplar with a final answer, which is what makes this checkable. Table 10 of the guide gives a complete input set for a dependent student, Table 11 walks every intermediate line, and the answer at the bottom is an SAI of 12,198. Feed the model those inputs first. If it hands back anything other than 12,198, it is running the wrong tables or inventing steps, and nothing it says about your family is worth reading.

Here is the prompt. It says ChatGPT because that is what most readers will reach for, and the rules inside it are model-agnostic, so any capable chatbot will do. I ran it on Claude (Opus 5) on August 24, 2026, in a single turn with three input sets pasted together and no follow-up corrections. The block below carries the first two of those sets. The third is the error case, a one-line change to the second, and it is described in prose further down instead of reprinted here.

The rule block goes in once, then the input sets follow. Paste the whole thing as a single message.

It is long because the tables are long. Copy it and skip to the results below if you would rather not read it.

Compute my 2027-28 FAFSA Student Aid Index (SAI), Formula A (dependent student). Use ONLY these rules and tables — SAI tables change every award year, so do not use any from memory.

PARENT INCOME
- Total income = both parents' AGI, plus, for each parent separately: max(untaxed portions of IRA distributions − IRA rollovers, 0).
ALLOWANCES AGAINST PARENT INCOME
- U.S. income tax paid (both parents' returns).
- Payroll taxes, per parent, on that parent's income earned from work: 6.2% (Social Security, on the first $176,100) + 1.45% (Medicare).
- Income Protection Allowance by family size (student included): 2 → $30,300 / 3 → $37,720 / 4 → $46,590 / 5 → $54,970 / 6 → $64,290, plus $7,260 for each member beyond 6.
- Employment Expense Allowance (both parents working): the lesser of 35% of combined income earned from work and $5,200.
PARENT AVAILABLE INCOME = total income − total allowances.
PARENT ASSETS
- Net worth = cash + savings + checking + net worth of investments (+ adjusted business/farm net worth if any). Asset Protection Allowance is $0 at every age.
- Contribution from assets = 12% of net worth.
ADJUSTED AVAILABLE INCOME (AAI) = available income + contribution from assets. Parents' contribution from AAI:
- below −$8,900 → −$1,958
- −$8,900 to $22,600 → 22% of AAI
- $22,601–$28,300 → $4,972 + 25% of the amount over $22,600
- $28,301–$34,000 → $6,397 + 29% over $28,300
- $34,001–$39,900 → $8,050 + 34% over $34,000
- $39,901–$45,600 → $10,056 + 40% over $39,900
- $45,601 and up → $12,336 + 47% over $45,600
STUDENT SIDE
- Student available income = student AGI − student income tax paid − payroll taxes on the student's income earned from work (6.2% + 1.45%) − student Income Protection Allowance $12,220. Contribution = 50% of that, never below $0.
- Student contribution from assets = 20% of student net worth.
SAI = parents' contribution + student contribution from income + student contribution from assets (floor −1,500). Round each table lookup result to whole dollars.

=== RUN 1 (the Education Department's own worked exemplar) ===
Family size 7, married parents. Parent A: AGI $86,334, income earned from work $95,456, income tax paid $28,334, untaxed IRA distributions $2,000, IRA rollover $1,000. Parent B: AGI $79,998, income earned from work $85,002, income tax paid $11,992, untaxed IRA distributions $1,000, IRA rollover $2,000. Cash/savings/checking $24,789, net worth of investments $48,574, no business/farm. Student: AGI $5,723, income earned from work $6,755, tax paid $0, assets $0.

=== RUN 2 (family of 4) ===
Family size 4, married parents filing jointly. Combined AGI $120,000 (income earned from work: $70,000 and $50,000), income tax paid $9,800, no untaxed IRA distributions. Cash/savings/checking $30,000, net worth of investments $25,000, no business/farm. Student: AGI $6,000, income earned from work $6,000, tax paid $0, assets $0.

Replace Run 2 with your own figures. Leave Run 1 exactly as it is, since its whole job is to fail loudly when the model improvises.

Run 1 landed on 12,198, matching the guide's Table 11 line for line, including the piece models most often get wrong. The parents' payroll allowance runs on income earned from work, $95,456 and $85,002, while the AGI figures sitting immediately above them read $86,334 and $79,998. Wages above AGI is what pre-tax deferrals look like on a return, since a 401(k) or HSA contribution leaves the W-2 wage before it ever reaches line 11. Run Parent A's allowance off AGI and you get $6,605 where the guide wants $7,302, a slip of $697 (Parent B: $6,120 against $6,503, another $383), so the pair costs about $1,080 of allowance. The exemplar's student works the same way. Claude's $517 is 7.65% of the $6,755 that student earned from work, and her AGI of $5,723 never enters the step. Her side floors to $0 either way, because the $12,220 student allowance swallows everything she made.

The family-of-four run, unpacked

Run 2 is a household most readers will recognize: married parents filing jointly, combined AGI of $120,000 from two paychecks of $70,000 and $50,000, $9,800 of income tax paid, $30,000 in cash across savings and checking, and $25,000 of investments made up of a parent-owned 529 and a small brokerage account. The student earned $6,000 over the summer and owns nothing.

Notice how little the allowances protect once you cross into the top band. The Employment Expense Allowance caps at $5,200 on a $120,000 income, so it shelters 4.3% of the money two working parents earn. And past $45,600 of adjusted available income, the formula takes 47 cents of every additional dollar, which is why the asset line hits so much harder than its 12% conversion rate suggests.

Why is my SAI so high? One line moved this family $10,152

Run 3 changed a single entry. The parents listed $180,000 of 401(k) and IRA balances under net worth of investments, a mistake that looks like diligence, and every other input stayed identical. The SAI came back at $27,296.

The arithmetic is simple enough to check on a phone. Adding $180,000 of net worth adds $21,600 at the 12% conversion, that $21,600 lands entirely in the top assessment band, and 47% of it is $10,152. Any dollar a family in this band reports by mistake costs 5.64 cents of SAI.

Worth being precise about the model's role here. The prompt defines parent net worth as cash plus investments with no retirement carve-out, so the $180,000 flowed straight through exactly as instructed. Claude flagged the problem anyway, noting on its own that qualified retirement accounts are reportable nowhere on the FAFSA and that Run 2 is therefore the number reflecting a correctly filled form. That was the model going past its instructions, and building a habit on it is how you end up trusting the next run, the quiet one, so read the asset line against your own account statements before you accept either number.

Does this number get you a Pell Grant?

The formula answers that in two places, and the second one arrived with the 2025 tax law.

First comes the maximum Pell shortcut, which hands the student the full maximum award without consulting the SAI at all. Three households take that route: one where the parents were non-filers for 2025, one headed by a single parent whose AGI plus foreign income exclusion sits at or below 225% of the 2025 poverty guideline for their family size and state, and any other parent household at or below 175% of it. The guidelines split into three buckets only: Alaska, Hawaii, and everywhere else. For a family of four in the 48 states and DC, the 2025 guideline is $32,150, which puts the 175% line at $56,263. The family above earns $120,000.

Then comes the ceiling. Since 2026-27, an SAI at or above twice the maximum Pell award ends Pell eligibility outright, and there is no reduced award for landing just over the line. For 2026-27 the maximum Pell was $7,395, unchanged since 2023-24, which put that cutoff at $14,790. An SAI of $17,144 sits $2,354 above the ceiling, so this family draws no federal Pell money at all.

Read that $14,790 as the 2026-27 figure, because it is. The 2027-28 maximum Pell depends on appropriations and gets announced in early 2027, so the 2027-28 cutoff does not exist yet. Anyone quoting one today is multiplying last year's award by two and hoping.

A household in this position spends its aid conversation on institutional need-based aid, where each college applies its own policy to the same SAI, and on merit money, which ignores the SAI completely. If loans end up in the mix, the RAP repayment change and the refinancing question under RAP are the far end of this same decision.

Six places the number goes wrong

The Asset Protection Allowance is zero, not small

Table A4 reads $0 at every parent age, one parent or two. Age is measured as of December 31, 2026, and if no parent date of birth is on file the formula assumes 45, which changes nothing because every row is zero.

Income earned from work is not AGI

The payroll allowance runs on wages, and the exemplar proves the gap costs real money: $95,456 of earnings against $86,334 of AGI for one parent. Use the wrong line and the allowance is wrong in whichever direction your investment income points.

Siblings in college no longer help

The SAI has no number-in-college divisor. Family size sets the Income Protection Allowance and that is the whole of its effect, so two children enrolled at once each carry a full SAI of the same size.

Family size comes off the tax return

Appendix C ties it to the number of exemptions claimed, pulled directly from the IRS data exchange. A household that thinks of itself as five and files as four loses $8,380 of Income Protection Allowance, and the fix runs through an amended return, since the form only repeats what the IRS hands it.

A negative SAI is a real number

It bottoms out at -1,500, and the form carries the minus sign all the way through. Nothing gets paid to you. It marks need below the point where the formula stops measuring, and some schools read it that way when they package aid.

2025 income against 2027 reality

A layoff in 2026 is invisible to a formula reading a 2025 return. The formula has no adjustment for it. What exists is a professional judgment request to each school's financial aid office, one office at a time, with documentation, and it is the only door here that a chatbot cannot compute its way through.

What I would do between now and October 1

I would run the exemplar this week and my own numbers the same evening. The payoff for doing it in August is discovering that this family's reportable net worth comes to $55,000, with 38 days of runway left to check the account statements against that figure. The $235,000 version of the same number surfaces in April instead, inside a school's offer letter, with the mistake already buried in a submitted form.

The 2027-28 FAFSA opens by October 1, 2026. A second beta round was scheduled for late August or early September and is open to any student or parent who requests in, which is the only sanctioned way to see the real form before launch. After launch, filing early matters for a mechanical reason: some state grants and institutional funds run first-come until they are exhausted, and the federal deadline is the loosest one on your calendar.

The asset question is the part I keep for myself. Everything else in this formula is arithmetic a model does perfectly on the first pass, as Run 1 shows. Deciding which accounts are reportable is a reading question about your own paperwork, and it is where the entire $10,152 lived.

The HSA and FSA run shows the same class of failure from the other side, where an AI answer went stale exactly at the newest published figure, and the debt payoff comparison is the other case on this site where one changed input reorders the whole answer.

Disclaimer

This is an educational explainer about the federal need analysis, not financial aid, tax or legal advice, and none of it is specific to your family. The family-of-four figures, the $180,000 of retirement balances and the asset totals are illustrative inputs you replace with your own. The verified figures are the 2027-28 tables, the 2025 poverty guidelines and the 2026-27 Pell parameters, each stated as of August 24, 2026 and each subject to change. The 2027-28 maximum Pell award has not been published, so no 2027-28 Pell cutoff appears here. Formula A covers dependent students only; independent students and dependent students with dependents of their own use Formulas B and C, which have different tables. Take a professional judgment appeal to each school's financial aid office directly.

Sources

• Federal Student Aid, 2027-28 Student Aid Index (SAI) and Pell Grant Eligibility Guide, Version 1.0, published June 2026, read August 24, 2026 (Formula A worksheet; Table A2 income protection allowances; Table A4 asset protection allowance at $0 for every age; Table A5 contribution from adjusted available income; the 12% and 20% conversion rates; the $12,220 student allowance; the -1,500 floor; Table 10 inputs and Table 11 worked calculation returning SAI 12,198; Appendix C on family size and the exemptions field): https://fsapartners.ed.gov/sites/default/files/2026-06/2728StudentAidIndexSAIandPellGrantEligibilityGuide.pdf
• Federal Register, "Federal Need Analysis Methodology for the 2027-28 Award Year," FR Doc 2026-10986, 91 FR 32959, published June 2, 2026 (the statutory table update, based in part on the April 2026 CPI-U): https://www.federalregister.gov/documents/2026/06/02/2026-10986/federal-need-analysis-methodology-for-the-2027-28-award-year-federal-pell-grant-federal-work-study
• Federal Student Aid, electronic announcement APP-26-10, "2027-28 FAFSA Beta Testing Plan," posted July 21, 2026 and updated August 6, 2026 (public launch by October 1, 2026; Beta 1 August 5-20 with a limited group; Beta 2 in late August or early September, open by request): https://fsapartners.ed.gov/knowledge-center/library/electronic-announcements/2026-07-21/2027-28-fafsa-beta-testing-plan-updated-august-6-2026
• Federal Student Aid, Dear Colleague Letter GEN-26-01, January 30, 2026 (2026-27 maximum Pell award of $7,395, which sets the twice-maximum cutoff at $14,790; no 2027-28 award published as of August 24, 2026): https://fsapartners.ed.gov/knowledge-center/library/dear-colleague-letters/2026-01-30/2026-27-federal-pell-grant-maximum-and-minimum-award-amounts
• Federal Student Aid, electronic announcement APP-25-23, August 15, 2025 (asset exclusions effective 2026-27 for a family business with 100 or fewer full-time-equivalent employees, a farm the family resides on, and a family commercial fishing business; the SAI ceiling at twice the maximum Pell award): https://fsapartners.ed.gov/knowledge-center/library/electronic-announcements/2025-08-15/2026-27-fafsa-form-and-pell-grant-eligibility-updates
• Department of Health and Human Services, "Annual Update of the HHS Poverty Guidelines," 90 FR 5917, January 17, 2025 (2025 guidelines used by the 2027-28 formula; $32,150 for a household of four in the 48 contiguous states and DC): https://www.federalregister.gov/documents/2025/01/17/2025-01377/annual-update-of-the-hhs-poverty-guidelines
• Cold run transcript, Claude (Opus 5), August 24, 2026, single turn, three input sets (Run 1 SAI $12,198, Run 2 SAI $17,144, Run 3 SAI $27,296).