The one-line model of a tax return
Every Form 1040 does the same thing: income − adjustments − deduction = taxable income, then the brackets are applied and credits are subtracted. If you hold that sentence in your head, the rest of the form is just detail.
Step 1: Total income
Add up wages (W-2), freelance income (1099-NEC), interest and dividends (1099-INT / DIV), capital gains (1099-B), rental income, and anything else. US citizens and residents report worldwide income, including income earned in Nepal.
Step 2: Adjustments
"Above-the-line" items reduce income before the deduction: traditional IRA and HSA contributions, student-loan interest, half of self-employment tax, and educator expenses. The result is your Adjusted Gross Income (AGI), the number many credits and phase-outs key off.
Step 3: Standard or itemized deduction
For tax year 2026 the standard deduction is $16,100 (single), $32,200 (married filing jointly) and $24,150 (head of household). You itemize only if mortgage interest, state and local taxes (capped), charitable gifts and medical costs add up to more than that. Most filers take the standard deduction.
Step 4: Brackets are marginal
A 22% bracket does not mean 22% of everything. Each slice of income is taxed at its own rate. A single filer with $60,000 of taxable income in 2026 pays 10% on the first $12,400, 12% on the next $38,000, and 22% only on the remaining $9,600. Their effective rate is closer to 12%.
Step 5: Credits beat deductions
A deduction reduces taxable income; a credit reduces tax directly. The Child Tax Credit, education credits, and the Earned Income Tax Credit are the big ones. Some are refundable, meaning they can produce a refund even when you owe nothing.
The four dates
| Date | What happens |
|---|---|
| April 15 | Return due; tax owed due even if you extend |
| June 15 · Sept 15 · Jan 15 | Quarterly estimates if you are self-employed |
| October 15 | Extended return deadline |
| January 31 | Employers must send W-2s and 1099s |
Tip: an extension gives you time to file, not time to pay. Estimate and pay by April 15 to avoid interest.
What to gather
Prior-year return, all W-2s and 1099s, records of deductions, dependents' Social Security numbers, and bank details for direct deposit. Business owners add their books. That is genuinely all most people need.
This guide is general information for United States taxpayers, not advice for your specific situation. Rates and thresholds change with each IRS revenue procedure; confirm current figures with the IRS or with us before acting.
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