Meet AGI — the number that runs your whole tax return

By now you know:

1. whether you’re required to file,

2. your filing status, and

3. what counts as income.

So what happens next on the 1040?

You hit a number that quietly controls almost everything:

AGI (Adjusted Gross Income)

If your tax return were a movie, AGI is the plot twist.

It determines whether you qualify for deductions, credits, and sometimes how much you pay for healthcare and student loans.

Let’s make it simple and real.

Step 1: Start with Gross Income

Think of gross income as your “money came in” total.

This includes things like:

• Wages (W-2 income)

• Tips

• Interest (1099-INT)

• Dividends (1099-DIV)

• Capital gains (selling stocks/crypto)

• Business income (self-employment/side hustle)

• Retirement income (IRA/401k/pensions)

• Social Security (sometimes taxable)

• Other taxable income

Real-life example

Keisha’s year looks like this:

• W-2 wages: $62,000

• Side hustle (net): $8,000

• Interest: $120

• Dividends: $380

Gross income = $62,000 + $8,000 + $120 + $380 = $70,500

That’s the starting line.

Step 2: Subtract “Adjustments” (a.k.a. Above-the-Line Deductions)

These are expenses the IRS lets you subtract before you even get to the standard deduction vs. itemizing.

That’s why people love them:

✅ You can take them even if you don’t itemize.

These adjustments are what turn gross income into AGI.

The formula:

AGI = Gross Income − Adjustments

What Counts as an Adjustment? (Plain English + Examples)

1) Educator expenses

If you’re a teacher and you paid out-of-pocket for classroom supplies, some of that may count.

Example:

Ms. Johnson spends $400 on supplies. Part of that may reduce AGI.

2) Certain business expenses (special categories)

This is for specific groups like:

• reservists traveling for duty,

• performing artists,

• fee-based government officials.

Example:

A national guard reservist drives for required duty and has qualifying travel costs.

3) HSA contributions (Health Savings Account)

If you have an HSA-eligible health plan and you contribute to an HSA, that can reduce AGI.

Example:

Marcus puts $3,000 into his HSA.

That can reduce his AGI by $3,000.

4) IRA contributions (traditional IRA)

If you qualify, contributing to a traditional IRA may reduce AGI.

Example:

Tasha contributes $6,500 to a traditional IRA.

That can reduce AGI (depending on income and whether she’s covered by a workplace plan).

5) Moving expenses (military only)

This one is mostly gone for most taxpayers — still available for certain active-duty military moves.

Example:

Active-duty service member relocates under orders → qualifying moving costs may reduce AGI.

6) Deductible part of self-employment tax

If you’re self-employed, you pay both sides of Social Security/Medicare. The IRS lets you deduct part of that calculation as an adjustment.

Example:

Nia is self-employed and owes $2,400 in self-employment tax.

She may be able to deduct about half (approx. $1,200) as an adjustment.

This doesn’t eliminate the SE tax—it just reduces income for AGI purposes.

7) Penalties on early savings withdrawals

If you got hit with a bank penalty for withdrawing from a CD early, that penalty can reduce AGI.

Example:

David breaks a CD and pays a $75 penalty → that may reduce AGI.

8) Retirement contributions

Some retirement contributions reduce AGI directly (like certain IRA/HSA situations).

Others reduce taxable wages before they even show up on your W-2 (like many 401(k) contributions).

Example:

If your W-2 wages are lower because you contributed to a 401(k), that benefit already happened upstream.

9) Student loan interest

If you paid student loan interest and qualify, you may be able to deduct some of it as an adjustment.

Example:

Bri pays $900 in student loan interest → that may reduce AGI.

10) Alimony (for older divorce agreements)

Important: alimony rules depend on when the divorce agreement was executed/modified.

Example:

Older agreements may allow the payer to deduct, newer ones generally don’t.

(Strategy note: always verify the agreement date.)

AGI in Action: A Full Example

Let’s go back to Keisha:

Gross income: $70,500

Adjustments:

• HSA contributions: $2,000

• Student loan interest: $800

• Deductible part of self-employment tax: $600

Total adjustments = $3,400

AGI = $70,500 − $3,400 = $67,100

That $67,100 is powerful.

Because it can impact:

• whether you qualify for certain credits,

• whether deductions are reduced,

• what portion of Social Security is taxable,

• premium tax credit reconciliation,

• and more.

Why I Call AGI “The Gatekeeper Number”

AGI decides what doors open.

Higher AGI can mean:

• less eligibility for credits,

• less favorable student loan repayment calculations,

• less favorable marketplace healthcare outcomes,

• more of your Social Security taxed,

• higher Medicare premiums (for some taxpayers).

Lower AGI (legally) can mean:

• more credits,

• less taxable income,

• better benefit outcomes.

AGI is where strategy begins.

Quick “Apply It To Your Life” Checklist

Ask yourself:

• Do I have an HSA I can fund?

• Am I eligible for a deductible IRA contribution?

• Do I have self-employment income where I’m missing deductions?

• Did I pay student loan interest?

• Did I pay any penalties to a bank?

• Do I have a divorce agreement that includes alimony?

If yes — you may have legal ways to reduce AGI.