The complete US tax guide for 2026

This is the whole US federal income tax system on one page: who has to file, every 2026 rate table, what is deducted, what is exempt, every major credit, how to get the tax number you need, and how to actually file. Written for individuals, families, freelancers and small business owners.

Figures throughout are for tax year 2026 - income earned between 1 January and 31 December 2026, reported on a return filed in early 2027 - taken from the IRS annual inflation adjustments in Revenue Procedure 2025-32. Where a 2025 figure matters for a return you are filing now, it is shown alongside.

Who has to file a return

For most people the filing threshold tracks the standard deduction: if your gross income is at or above it, you file. For 2026 that means roughly $16,100 for a single filer under 65 and $32,200 for a married couple filing jointly, with higher figures if you are 65 or older.

But those thresholds are not the whole test. You must file regardless of income level if any of the following applies:

• You had $400 or more of net self-employment earnings. This is the one that catches side-hustlers, and the threshold has not moved in decades.
• You owe special taxes - additional Medicare tax, alternative minimum tax, or a penalty on an early retirement withdrawal.
• You received advance premium tax credits through a health insurance marketplace.
• You are claimed as a dependent and have unearned income above the applicable limit.

Filing status: pick this first, because everything follows from it

Two practical points. Your status is determined by your situation on 31 December - marry on 30 December and you are married for the whole year. And head of household is materially better than single: a wider 12 per cent and 22 per cent band plus $8,050 more of standard deduction. If you are unmarried and supporting a child or dependent relative, check whether you qualify before defaulting to single.

For 2025 returns still being filed, the standard deduction was $15,750 single and married filing separately, $31,500 joint, and $23,625 head of household.

The 2026 tax rate tables

Seven rates, made permanent by the One Big Beautiful Bill Act. Each rate applies only to the income inside its band - never to your whole income.

Single filers

Married filing jointly, and qualifying surviving spouse

Head of household

Married filing separately uses the single bands up to the 35 per cent threshold, with the top rate starting at half the joint figure.

Standard deduction or itemising

You take whichever is larger. Since the standard deduction was roughly doubled in 2017 and raised again by the OBBBA, the large majority of filers take the standard deduction and never think about it again.

Itemising means listing actual deductible expenses on Schedule A instead. It is worth doing only if the total beats your standard deduction. The main categories:

The SALT change is the big one. Raising the cap from $10,000 to $40,400 has pushed a large number of households in high-tax states back into itemising for the first time since 2017. If you last checked before 2025, check again.

Two further points for 2026. Personal exemptions remain at zero - they were eliminated in 2017 and that is now permanent. And there is a limitation on the benefit of itemised deductions for taxpayers in the top 37 per cent bracket.

Deductions you get without itemising

These come off before AGI, so you get them whether or not you itemise. This list is where most missed money sits.

• Traditional IRA contributions - subject to income limits if you or a spouse have a workplace plan
• Health Savings Account contributions - $4,400 self-only, $8,750 family for 2026
• Half of self-employment tax - automatic if you file Schedule SE
• Self-employed health insurance premiums
• Self-employed retirement contributions - SEP, SIMPLE or solo 401(k)
• Student loan interest - up to $2,500, income-phased
• Educator expenses for teachers
• Charitable cash gifts for non-itemisers - a limited deduction reinstated by the OBBBA
• New OBBBA deductions for tips, overtime and car loan interest - temporary, each capped and income-phased. Check the current caps on the IRS pages before claiming

And separately, the qualified business income deduction: 20 per cent of qualified business income from a sole proprietorship, partnership, S corporation, or rental activity that rises to a trade or business. Made permanent by the OBBBA. Above higher income levels it becomes limited by wages and property, and by whether the business is a specified service trade. For a freelancer with $95,000 of profit it is typically worth over $3,000 of tax - and it is one of the most commonly missed items on a self-prepared return.

Payroll and self-employment taxes

These sit alongside income tax, not inside it, and for many working people they are the larger number.

Self-employment tax is 15.3 per cent, applied to 92.35 per cent of net profit rather than all of it, and half of the result is deductible in arriving at AGI. It starts at just $400 of net earnings. Someone with $95,000 of Schedule C profit owes about $13,423 of self-employment tax - typically more than their income tax at that level, which is exactly why budgeting from the bracket table alone leaves freelancers short.

Investment income

Long-term gains - assets held more than one year - and qualified dividends get their own preferential rates, stacked on top of your ordinary income.

Confirm the 15 to 20 per cent boundary against the current Revenue Procedure before relying on it for a large disposal - published figures for that threshold vary.

• Short-term gains - assets held a year or less - are taxed at your ordinary rates, with no preferential treatment at all.
• Net investment income tax of 3.8 per cent applies on top for higher earners, bringing the effective top long-term rate to 23.8 per cent.
• Capital losses offset capital gains without limit, and up to $3,000 of net loss can offset ordinary income each year, with the remainder carried forward indefinitely.
• Wash sale rule: repurchasing substantially identical securities within 30 days before or after a loss sale disallows the loss.

The 0 per cent band is genuinely useful and widely ignored. A retired couple with modest ordinary income can realise a meaningful long-term gain at zero federal tax.

Credits: the part that actually moves your bill

A deduction reduces the income you are taxed on. A credit reduces the tax itself, dollar for dollar - so a $1,000 credit is worth far more than a $1,000 deduction. Refundable credits can produce a refund larger than the tax you paid; non-refundable credits stop at zero.

Exemptions and exclusions: income that is never taxed

Distinct from deductions. This is income that simply does not enter the calculation.

Also worth knowing: the estate tax basic exclusion is $15,000,000 per person for 2026, so the vast majority of estates owe none. And the alternative minimum tax exemption is $90,100 for unmarried filers, phasing out from $500,000, and $140,200 joint, phasing out from $1,000,000 - it now touches relatively few people.

Retirement and savings limits for 2026

These are the most reliable tax reduction available to an ordinary earner. A traditional 401(k) contribution reduces taxable income immediately; an HSA is unusual in being deductible going in, growing untaxed, and coming out untaxed for medical costs.

How to register for tax purposes

Before you can file, you need the right identifying number. Which one depends on who you are and what you are doing.

Two cautions. Nobody should ever charge you for an EIN - it is free and takes minutes. And an ITIN can expire if unused for a period of years, so if you are returning to the US tax system after a gap, check whether yours needs renewing before you file.

How to file, step by step

Everything for individuals runs through Form 1040. Schedules attach to it as your situation requires: Schedule A for itemised deductions, Schedule B for interest and dividends, Schedule C for self-employment, Schedule D for capital gains, Schedule E for rental and pass-through income, Schedule SE for self-employment tax, and Schedule 8812 for the child credit.

Then choose how to file:

E-file with direct deposit is both the fastest route to a refund and the one least likely to produce a processing error. Free filing options change from season to season, so check what is currently offered before paying for software.

The tax calendar

Paying, refunds and what penalties cost

Pay through IRS Direct Pay from a bank account, EFTPS if you want scheduled payments, a card with a processing fee, or a cheque with a voucher. Whichever you use, make sure the payment is tagged to the correct tax year and form - misapplied payments are tedious to unwind.

If you cannot pay in full, file anyway. The two penalties are very different in size:

Filing on time and paying late costs a tenth of what filing late costs. If money is the problem, file and then request an instalment agreement online. First-time penalty abatement is also available where you have a clean compliance history.

Refunds on an e-filed return with direct deposit typically arrive within a few weeks, though returns claiming the Earned Income Tax Credit or the Additional Child Tax Credit are held by law until mid-February. Track progress with the IRS "Where's My Refund" tool rather than refiling.

State income tax

Federal tax is only part of the bill. Most states levy their own income tax with their own rates, deductions, credits and deadlines, and filing federally does nothing for your state.

Nine states impose no personal income tax on wages: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming. Everywhere else, budget for a state return - and if you moved, worked remotely across state lines, or hold property in another state, expect more than one.

What to keep, and for how long

• Three years from the filing date is the general assessment period, so that is the minimum for routine records.
• Six years if income was understated by more than 25 per cent.
• Indefinitely if a return was never filed, or was fraudulent.
• As long as you own the asset, plus three years, for anything establishing cost basis - property purchase documents, improvement receipts, brokerage confirmations, records of reinvested dividends.
• Permanently for the returns themselves. They are small files and you will want them for mortgages, immigration, benefits and estate administration.

The mistakes that cost the most

1. Not filing because you owe money. The failure-to-file penalty is ten times the failure-to-pay penalty.
2. Confusing marginal and effective rates, and turning down income or a raise because of it.
3. Defaulting to single when you qualify as head of household. Worth thousands.
4. Missing the Earned Income Tax Credit because you were not required to file.
5. Skipping the QBI deduction on self-employment income.
6. Not itemising after the SALT cap rose to $40,400 - if you last checked before 2025, the answer may have changed.
7. Forgetting estimated payments in your first self-employed year and taking a penalty on top of an unexpected bill.
8. Never revisiting Form W-4 after marriage, a child or a second job.
9. Assuming no 1099 means no tax. Income is taxable whether or not a form was issued - and the 1099-NEC threshold rose to $2,000 for 2026, so fewer forms will arrive.
10. Ignoring the state. Two systems, two sets of rules, two deadlines.

Go deeper on any section

Each part of this guide has a dedicated walkthrough with worked examples, document formats and filing checklists.

Related guides: Quarterly estimated taxes in 2026, Self-employment tax explained and Business expense deductions.

Sources

This guide is written against the official and clearly labelled professional references below. Rates, thresholds and portal procedures change between reviews, so open the primary source before relying on a figure.

• Businesses (Internal Revenue Service)
• About Form 1040-ES, Estimated Tax for Individuals (IRS)
• About Publication 334, Tax Guide for Small Business (IRS)
• Individual Taxpayer Identification Number (IRS)

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